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2084 lines
86 KiB
JavaScript
2084 lines
86 KiB
JavaScript
/**
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* @license Highcharts JS v6.0.4 (2017-12-15)
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* Accessibility module
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*
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* (c) 2010-2017 Highsoft AS
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* Author: Oystein Moseng
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*
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* License: www.highcharts.com/license
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*/
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'use strict';
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(function(factory) {
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if (typeof module === 'object' && module.exports) {
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module.exports = factory;
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} else {
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factory(Highcharts);
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}
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}(function(Highcharts) {
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(function(H) {
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/**
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* Accessibility module - Screen Reader support
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*
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* (c) 2010-2017 Highsoft AS
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* Author: Oystein Moseng
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*
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* License: www.highcharts.com/license
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*/
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/* eslint max-len: ["warn", 80, 4] */
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var win = H.win,
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doc = win.document,
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each = H.each,
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erase = H.erase,
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addEvent = H.addEvent,
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dateFormat = H.dateFormat,
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merge = H.merge,
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// CSS style to hide element from visual users while still exposing it to
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// screen readers
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hiddenStyle = {
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position: 'absolute',
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left: '-9999px',
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top: 'auto',
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width: '1px',
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height: '1px',
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overflow: 'hidden'
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},
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// Human readable description of series and each point in singular and
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// plural
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typeToSeriesMap = {
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'default': ['series', 'data point', 'data points'],
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'line': ['line', 'data point', 'data points'],
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'spline': ['line', 'data point', 'data points'],
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'area': ['line', 'data point', 'data points'],
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'areaspline': ['line', 'data point', 'data points'],
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'pie': ['pie', 'slice', 'slices'],
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'column': ['column series', 'column', 'columns'],
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'bar': ['bar series', 'bar', 'bars'],
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'scatter': ['scatter series', 'data point', 'data points'],
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'boxplot': ['boxplot series', 'box', 'boxes'],
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'arearange': ['arearange series', 'data point', 'data points'],
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'areasplinerange': [
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'areasplinerange series',
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'data point',
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'data points'
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],
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'bubble': ['bubble series', 'bubble', 'bubbles'],
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'columnrange': ['columnrange series', 'column', 'columns'],
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'errorbar': ['errorbar series', 'errorbar', 'errorbars'],
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'funnel': ['funnel', 'data point', 'data points'],
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'pyramid': ['pyramid', 'data point', 'data points'],
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'waterfall': ['waterfall series', 'column', 'columns'],
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'map': ['map', 'area', 'areas'],
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'mapline': ['line', 'data point', 'data points'],
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'mappoint': ['point series', 'data point', 'data points'],
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'mapbubble': ['bubble series', 'bubble', 'bubbles']
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},
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// Descriptions for exotic chart types
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typeDescriptionMap = {
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boxplot: ' Box plot charts are typically used to display groups of ' +
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'statistical data. Each data point in the chart can have up to 5 ' +
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'values: minimum, lower quartile, median, upper quartile and ' +
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'maximum. ',
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arearange: ' Arearange charts are line charts displaying a range ' +
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'between a lower and higher value for each point. ',
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areasplinerange: ' These charts are line charts displaying a range ' +
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'between a lower and higher value for each point. ',
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bubble: ' Bubble charts are scatter charts where each data point ' +
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'also has a size value. ',
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columnrange: ' Columnrange charts are column charts displaying a ' +
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'range between a lower and higher value for each point. ',
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errorbar: ' Errorbar series are used to display the variability of ' +
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'the data. ',
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funnel: ' Funnel charts are used to display reduction of data in ' +
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'stages. ',
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pyramid: ' Pyramid charts consist of a single pyramid with item ' +
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'heights corresponding to each point value. ',
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waterfall: ' A waterfall chart is a column chart where each column ' +
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'contributes towards a total end value. '
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};
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// If a point has one of the special keys defined, we expose all keys to the
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// screen reader.
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H.Series.prototype.commonKeys = ['name', 'id', 'category', 'x', 'value', 'y'];
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H.Series.prototype.specialKeys = [
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'z', 'open', 'high', 'q3', 'median', 'q1', 'low', 'close'
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];
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if (H.seriesTypes.pie) {
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// A pie is always simple. Don't quote me on that.
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H.seriesTypes.pie.prototype.specialKeys = [];
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}
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/**
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* Accessibility options
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* @type {Object}
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* @optionparent
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*/
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H.setOptions({
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/**
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* Options for configuring accessibility for the chart. Requires the
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* [accessibility module](//code.highcharts.com/modules/accessibility.
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* js) to be loaded. For a description of the module and information
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* on its features, see [Highcharts Accessibility](http://www.highcharts.
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* com/docs/chart-concepts/accessibility).
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*
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* @since 5.0.0
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*/
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accessibility: {
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/**
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* Enable accessibility features for the chart.
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*
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* @type {Boolean}
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* @default true
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* @since 5.0.0
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*/
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enabled: true,
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/**
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* When a series contains more points than this, we no longer expose
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* information about individual points to screen readers.
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*
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* Set to `false` to disable.
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*
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* @type {Number|Boolean}
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* @since 5.0.0
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*/
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pointDescriptionThreshold: false // set to false to disable
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/**
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* Whether or not to add series descriptions to charts with a single
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* series.
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*
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* @type {Boolean}
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* @default false
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* @since 5.0.0
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* @apioption accessibility.describeSingleSeries
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*/
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/**
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* Function to run upon clicking the "View as Data Table" link in the
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* screen reader region.
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*
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* By default Highcharts will insert and set focus to a data table
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* representation of the chart.
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*
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* @type {Function}
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* @since 5.0.0
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* @apioption accessibility.onTableAnchorClick
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*/
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/**
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* Date format to use for points on datetime axes when describing them
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* to screen reader users.
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*
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* Defaults to the same format as in tooltip.
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*
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* For an overview of the replacement codes, see
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* [dateFormat](#Highcharts.dateFormat).
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*
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* @type {String}
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* @see [pointDateFormatter](#accessibility.pointDateFormatter)
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* @since 5.0.0
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* @apioption accessibility.pointDateFormat
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*/
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/**
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* Formatter function to determine the date/time format used with
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* points on datetime axes when describing them to screen reader users.
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* Receives one argument, `point`, referring to the point to describe.
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* Should return a date format string compatible with
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* [dateFormat](#Highcharts.dateFormat).
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*
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* @type {Function}
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* @see [pointDateFormat](#accessibility.pointDateFormat)
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* @since 5.0.0
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* @apioption accessibility.pointDateFormatter
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*/
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/**
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* Formatter function to use instead of the default for point
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* descriptions.
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* Receives one argument, `point`, referring to the point to describe.
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* Should return a String with the description of the point for a screen
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* reader user.
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*
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* @type {Function}
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* @see [point.description](#series.line.data.description)
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* @since 5.0.0
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* @apioption accessibility.pointDescriptionFormatter
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*/
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/**
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* A formatter function to create the HTML contents of the hidden screen
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* reader information region. Receives one argument, `chart`, referring
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* to the chart object. Should return a String with the HTML content
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* of the region.
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*
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* The link to view the chart as a data table will be added
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* automatically after the custom HTML content.
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*
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* @type {Function}
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* @default undefined
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* @since 5.0.0
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* @apioption accessibility.screenReaderSectionFormatter
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*/
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/**
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* Formatter function to use instead of the default for series
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* descriptions. Receives one argument, `series`, referring to the
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* series to describe. Should return a String with the description of
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* the series for a screen reader user.
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*
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* @type {Function}
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* @see [series.description](#plotOptions.series.description)
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* @since 5.0.0
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* @apioption accessibility.seriesDescriptionFormatter
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*/
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}
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});
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/**
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* A text description of the chart.
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*
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* If the Accessibility module is loaded, this is included by default
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* as a long description of the chart and its contents in the hidden
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* screen reader information region.
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*
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* @type {String}
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* @see [typeDescription](#chart.typeDescription)
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* @default undefined
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* @since 5.0.0
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* @apioption chart.description
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*/
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/**
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* A text description of the chart type.
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*
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* If the Accessibility module is loaded, this will be included in the
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* description of the chart in the screen reader information region.
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*
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*
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* Highcharts will by default attempt to guess the chart type, but for
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* more complex charts it is recommended to specify this property for
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* clarity.
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*
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* @type {String}
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* @default undefined
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* @since 5.0.0
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* @apioption chart.typeDescription
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*/
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/**
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* HTML encode some characters vulnerable for XSS.
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* @param {string} html The input string
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* @return {string} The excaped string
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*/
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function htmlencode(html) {
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return html
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.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/'/g, ''')
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.replace(/\//g, '/');
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}
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/**
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* Strip HTML tags away from a string. Used for aria-label attributes, painting
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* on a canvas will fail if the text contains tags.
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* @param {String} s The input string
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* @return {String} The filtered string
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*/
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function stripTags(s) {
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return typeof s === 'string' ? s.replace(/<\/?[^>]+(>|$)/g, '') : s;
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}
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// Utility function. Reverses child nodes of a DOM element
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function reverseChildNodes(node) {
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var i = node.childNodes.length;
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while (i--) {
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node.appendChild(node.childNodes[i]);
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}
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}
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// Whenever drawing series, put info on DOM elements
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H.wrap(H.Series.prototype, 'render', function(proceed) {
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proceed.apply(this, Array.prototype.slice.call(arguments, 1));
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if (this.chart.options.accessibility.enabled) {
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this.setA11yDescription();
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}
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});
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// Put accessible info on series and points of a series
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H.Series.prototype.setA11yDescription = function() {
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var a11yOptions = this.chart.options.accessibility,
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firstPointEl = (
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this.points &&
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this.points.length &&
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this.points[0].graphic &&
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this.points[0].graphic.element
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),
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seriesEl = (
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firstPointEl &&
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firstPointEl.parentNode || this.graph &&
|
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this.graph.element || this.group &&
|
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this.group.element
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); // Could be tracker series depending on series type
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if (seriesEl) {
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// For some series types the order of elements do not match the order of
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// points in series. In that case we have to reverse them in order for
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// AT to read them out in an understandable order
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if (seriesEl.lastChild === firstPointEl) {
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reverseChildNodes(seriesEl);
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}
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// Make individual point elements accessible if possible. Note: If
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// markers are disabled there might not be any elements there to make
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// accessible.
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if (
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this.points && (
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this.points.length < a11yOptions.pointDescriptionThreshold ||
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a11yOptions.pointDescriptionThreshold === false
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)
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) {
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each(this.points, function(point) {
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if (point.graphic) {
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point.graphic.element.setAttribute('role', 'img');
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point.graphic.element.setAttribute('tabindex', '-1');
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point.graphic.element.setAttribute('aria-label', stripTags(
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point.series.options.pointDescriptionFormatter &&
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point.series.options.pointDescriptionFormatter(point) ||
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a11yOptions.pointDescriptionFormatter &&
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a11yOptions.pointDescriptionFormatter(point) ||
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point.buildPointInfoString()
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));
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}
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});
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}
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// Make series element accessible
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if (this.chart.series.length > 1 || a11yOptions.describeSingleSeries) {
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seriesEl.setAttribute(
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'role',
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this.options.exposeElementToA11y ? 'img' : 'region'
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);
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seriesEl.setAttribute('tabindex', '-1');
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seriesEl.setAttribute(
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'aria-label',
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stripTags(
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a11yOptions.seriesDescriptionFormatter &&
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a11yOptions.seriesDescriptionFormatter(this) ||
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this.buildSeriesInfoString()
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)
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);
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}
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}
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};
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|
|
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// Return string with information about series
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H.Series.prototype.buildSeriesInfoString = function() {
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var typeInfo = (
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typeToSeriesMap[this.type] ||
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typeToSeriesMap['default'] // eslint-disable-line dot-notation
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),
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description = this.description || this.options.description;
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return (this.name ? this.name + ', ' : '') +
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(this.chart.types.length === 1 ? typeInfo[0] : 'series') +
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' ' + (this.index + 1) + ' of ' + (this.chart.series.length) +
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(
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this.chart.types.length === 1 ?
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' with ' :
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'. ' + typeInfo[0] + ' with '
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) +
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(
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this.points.length + ' ' +
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(this.points.length === 1 ? typeInfo[1] : typeInfo[2])
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) +
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(description ? '. ' + description : '') +
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(
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this.chart.yAxis.length > 1 && this.yAxis ?
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'. Y axis, ' + this.yAxis.getDescription() :
|
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''
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) +
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(
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this.chart.xAxis.length > 1 && this.xAxis ?
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'. X axis, ' + this.xAxis.getDescription() :
|
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''
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);
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};
|
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|
|
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// Return string with information about point
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H.Point.prototype.buildPointInfoString = function() {
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var point = this,
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series = point.series,
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a11yOptions = series.chart.options.accessibility,
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infoString = '',
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dateTimePoint = series.xAxis && series.xAxis.isDatetimeAxis,
|
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timeDesc =
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dateTimePoint &&
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dateFormat(
|
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a11yOptions.pointDateFormatter &&
|
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a11yOptions.pointDateFormatter(point) ||
|
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a11yOptions.pointDateFormat ||
|
|
H.Tooltip.prototype.getXDateFormat(
|
|
point,
|
|
series.chart.options.tooltip,
|
|
series.xAxis
|
|
),
|
|
point.x
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|
),
|
|
hasSpecialKey = H.find(series.specialKeys, function(key) {
|
|
return point[key] !== undefined;
|
|
});
|
|
|
|
// If the point has one of the less common properties defined, display all
|
|
// that are defined
|
|
if (hasSpecialKey) {
|
|
if (dateTimePoint) {
|
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infoString = timeDesc;
|
|
}
|
|
each(series.commonKeys.concat(series.specialKeys), function(key) {
|
|
if (point[key] !== undefined && !(dateTimePoint && key === 'x')) {
|
|
infoString += (infoString ? '. ' : '') +
|
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key + ', ' +
|
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point[key];
|
|
}
|
|
});
|
|
} else {
|
|
// Pick and choose properties for a succint label
|
|
infoString =
|
|
(
|
|
this.name ||
|
|
timeDesc ||
|
|
this.category ||
|
|
this.id ||
|
|
'x, ' + this.x
|
|
) + ', ' +
|
|
(this.value !== undefined ? this.value : this.y);
|
|
}
|
|
|
|
return (this.index + 1) + '. ' + infoString + '.' +
|
|
(this.description ? ' ' + this.description : '');
|
|
};
|
|
|
|
|
|
// Get descriptive label for axis
|
|
H.Axis.prototype.getDescription = function() {
|
|
return (
|
|
this.userOptions && this.userOptions.description ||
|
|
this.axisTitle && this.axisTitle.textStr ||
|
|
this.options.id ||
|
|
this.categories && 'categories' ||
|
|
'values'
|
|
);
|
|
};
|
|
|
|
|
|
// Whenever adding or removing series, keep track of types present in chart
|
|
H.wrap(H.Series.prototype, 'init', function(proceed) {
|
|
proceed.apply(this, Array.prototype.slice.call(arguments, 1));
|
|
var chart = this.chart;
|
|
if (chart.options.accessibility.enabled) {
|
|
chart.types = chart.types || [];
|
|
|
|
// Add type to list if does not exist
|
|
if (chart.types.indexOf(this.type) < 0) {
|
|
chart.types.push(this.type);
|
|
}
|
|
|
|
addEvent(this, 'remove', function() {
|
|
var removedSeries = this,
|
|
hasType = false;
|
|
|
|
// Check if any of the other series have the same type as this one.
|
|
// Otherwise remove it from the list.
|
|
each(chart.series, function(s) {
|
|
if (
|
|
s !== removedSeries &&
|
|
chart.types.indexOf(removedSeries.type) < 0
|
|
) {
|
|
hasType = true;
|
|
}
|
|
});
|
|
if (!hasType) {
|
|
erase(chart.types, removedSeries.type);
|
|
}
|
|
});
|
|
}
|
|
});
|
|
|
|
|
|
// Return simplified description of chart type. Some types will not be familiar
|
|
// to most screen reader users, but we try.
|
|
H.Chart.prototype.getTypeDescription = function() {
|
|
var firstType = this.types && this.types[0],
|
|
mapTitle = this.series[0] && this.series[0].mapTitle;
|
|
if (!firstType) {
|
|
return 'Empty chart.';
|
|
} else if (firstType === 'map') {
|
|
return mapTitle ? 'Map of ' + mapTitle : 'Map of unspecified region.';
|
|
} else if (this.types.length > 1) {
|
|
return 'Combination chart.';
|
|
} else if (['spline', 'area', 'areaspline'].indexOf(firstType) > -1) {
|
|
return 'Line chart.';
|
|
}
|
|
return firstType + ' chart.' + (typeDescriptionMap[firstType] || '');
|
|
};
|
|
|
|
|
|
// Return object with text description of each of the chart's axes
|
|
H.Chart.prototype.getAxesDescription = function() {
|
|
var numXAxes = this.xAxis.length,
|
|
numYAxes = this.yAxis.length,
|
|
desc = {},
|
|
i;
|
|
|
|
if (numXAxes) {
|
|
desc.xAxis = 'The chart has ' + numXAxes +
|
|
(numXAxes > 1 ? ' X axes' : ' X axis') + ' displaying ';
|
|
if (numXAxes < 2) {
|
|
desc.xAxis += this.xAxis[0].getDescription() + '.';
|
|
} else {
|
|
for (i = 0; i < numXAxes - 1; ++i) {
|
|
desc.xAxis += (i ? ', ' : '') + this.xAxis[i].getDescription();
|
|
}
|
|
desc.xAxis += ' and ' + this.xAxis[i].getDescription() + '.';
|
|
}
|
|
}
|
|
|
|
if (numYAxes) {
|
|
desc.yAxis = 'The chart has ' + numYAxes +
|
|
(numYAxes > 1 ? ' Y axes' : ' Y axis') + ' displaying ';
|
|
if (numYAxes < 2) {
|
|
desc.yAxis += this.yAxis[0].getDescription() + '.';
|
|
} else {
|
|
for (i = 0; i < numYAxes - 1; ++i) {
|
|
desc.yAxis += (i ? ', ' : '') + this.yAxis[i].getDescription();
|
|
}
|
|
desc.yAxis += ' and ' + this.yAxis[i].getDescription() + '.';
|
|
}
|
|
}
|
|
|
|
return desc;
|
|
};
|
|
|
|
|
|
// Set a11y attribs on exporting menu
|
|
H.Chart.prototype.addAccessibleContextMenuAttribs = function() {
|
|
var exportList = this.exportDivElements;
|
|
if (exportList) {
|
|
// Set tabindex on the menu items to allow focusing by script
|
|
// Set role to give screen readers a chance to pick up the contents
|
|
each(exportList, function(item) {
|
|
if (item.tagName === 'DIV' &&
|
|
!(item.children && item.children.length)) {
|
|
item.setAttribute('role', 'menuitem');
|
|
item.setAttribute('tabindex', -1);
|
|
}
|
|
});
|
|
// Set accessibility properties on parent div
|
|
exportList[0].parentNode.setAttribute('role', 'menu');
|
|
exportList[0].parentNode.setAttribute('aria-label', 'Chart export');
|
|
}
|
|
};
|
|
|
|
|
|
// Add screen reader region to chart.
|
|
// tableId is the HTML id of the table to focus when clicking the table anchor
|
|
// in the screen reader region.
|
|
H.Chart.prototype.addScreenReaderRegion = function(id, tableId) {
|
|
var chart = this,
|
|
series = chart.series,
|
|
options = chart.options,
|
|
a11yOptions = options.accessibility,
|
|
hiddenSection = chart.screenReaderRegion = doc.createElement('div'),
|
|
tableShortcut = doc.createElement('h4'),
|
|
tableShortcutAnchor = doc.createElement('a'),
|
|
chartHeading = doc.createElement('h4'),
|
|
chartTypes = chart.types || [],
|
|
// Build axis info - but not for pies and maps. Consider not adding for
|
|
// certain other types as well (funnel, pyramid?)
|
|
axesDesc = (
|
|
chartTypes.length === 1 && chartTypes[0] === 'pie' ||
|
|
chartTypes[0] === 'map'
|
|
) && {} || chart.getAxesDescription(),
|
|
chartTypeInfo = series[0] && typeToSeriesMap[series[0].type] ||
|
|
typeToSeriesMap['default']; // eslint-disable-line dot-notation
|
|
|
|
hiddenSection.setAttribute('id', id);
|
|
hiddenSection.setAttribute('role', 'region');
|
|
hiddenSection.setAttribute(
|
|
'aria-label',
|
|
'Chart screen reader information.'
|
|
);
|
|
|
|
hiddenSection.innerHTML =
|
|
a11yOptions.screenReaderSectionFormatter &&
|
|
a11yOptions.screenReaderSectionFormatter(chart) ||
|
|
'<div>Use regions/landmarks to skip ahead to chart' +
|
|
(series.length > 1 ? ' and navigate between data series' : '') +
|
|
'.</div><h3>' +
|
|
(options.title.text ? htmlencode(options.title.text) : 'Chart') +
|
|
(
|
|
options.subtitle && options.subtitle.text ?
|
|
'. ' + htmlencode(options.subtitle.text) :
|
|
''
|
|
) +
|
|
'</h3><h4>Long description.</h4><div>' +
|
|
(options.chart.description || 'No description available.') +
|
|
'</div><h4>Structure.</h4><div>Chart type: ' +
|
|
(options.chart.typeDescription || chart.getTypeDescription()) +
|
|
'</div>' +
|
|
(
|
|
series.length === 1 ?
|
|
(
|
|
'<div>' + chartTypeInfo[0] + ' with ' +
|
|
series[0].points.length + ' ' +
|
|
(
|
|
series[0].points.length === 1 ?
|
|
chartTypeInfo[1] :
|
|
chartTypeInfo[2]
|
|
) +
|
|
'.</div>'
|
|
) : ''
|
|
) +
|
|
(axesDesc.xAxis ? ('<div>' + axesDesc.xAxis + '</div>') : '') +
|
|
(axesDesc.yAxis ? ('<div>' + axesDesc.yAxis + '</div>') : '');
|
|
|
|
// Add shortcut to data table if export-data is loaded
|
|
if (chart.getCSV) {
|
|
tableShortcutAnchor.innerHTML = 'View as data table.';
|
|
tableShortcutAnchor.href = '#' + tableId;
|
|
// Make this unreachable by user tabbing
|
|
tableShortcutAnchor.setAttribute('tabindex', '-1');
|
|
tableShortcutAnchor.onclick =
|
|
a11yOptions.onTableAnchorClick || function() {
|
|
chart.viewData();
|
|
doc.getElementById(tableId).focus();
|
|
};
|
|
tableShortcut.appendChild(tableShortcutAnchor);
|
|
hiddenSection.appendChild(tableShortcut);
|
|
}
|
|
|
|
// Note: JAWS seems to refuse to read aria-label on the container, so add an
|
|
// h4 element as title for the chart.
|
|
chartHeading.innerHTML = 'Chart graphic.';
|
|
chart.renderTo.insertBefore(chartHeading, chart.renderTo.firstChild);
|
|
chart.renderTo.insertBefore(hiddenSection, chart.renderTo.firstChild);
|
|
|
|
// Hide the section and the chart heading
|
|
merge(true, chartHeading.style, hiddenStyle);
|
|
merge(true, hiddenSection.style, hiddenStyle);
|
|
};
|
|
|
|
|
|
// Make chart container accessible, and wrap table functionality
|
|
H.Chart.prototype.callbacks.push(function(chart) {
|
|
var options = chart.options,
|
|
a11yOptions = options.accessibility;
|
|
|
|
if (!a11yOptions.enabled) {
|
|
return;
|
|
}
|
|
|
|
var titleElement = doc.createElementNS(
|
|
'http://www.w3.org/2000/svg',
|
|
'title'
|
|
),
|
|
exportGroupElement = doc.createElementNS(
|
|
'http://www.w3.org/2000/svg',
|
|
'g'
|
|
),
|
|
descElement = chart.container.getElementsByTagName('desc')[0],
|
|
textElements = chart.container.getElementsByTagName('text'),
|
|
titleId = 'highcharts-title-' + chart.index,
|
|
tableId = 'highcharts-data-table-' + chart.index,
|
|
hiddenSectionId = 'highcharts-information-region-' + chart.index,
|
|
chartTitle = options.title.text || 'Chart';
|
|
|
|
// Add SVG title/desc tags
|
|
titleElement.textContent = htmlencode(chartTitle);
|
|
titleElement.id = titleId;
|
|
descElement.parentNode.insertBefore(titleElement, descElement);
|
|
chart.renderTo.setAttribute('role', 'region');
|
|
chart.renderTo.setAttribute(
|
|
'aria-label',
|
|
stripTags(
|
|
'Interactive chart. ' + chartTitle +
|
|
'. Use up and down arrows to navigate with most screen readers.'
|
|
)
|
|
);
|
|
|
|
// Set screen reader properties on export menu
|
|
if (
|
|
chart.exportSVGElements &&
|
|
chart.exportSVGElements[0] &&
|
|
chart.exportSVGElements[0].element
|
|
) {
|
|
var oldExportCallback = chart.exportSVGElements[0].element.onclick,
|
|
parent = chart.exportSVGElements[0].element.parentNode;
|
|
chart.exportSVGElements[0].element.onclick = function() {
|
|
oldExportCallback.apply(
|
|
this,
|
|
Array.prototype.slice.call(arguments)
|
|
);
|
|
chart.addAccessibleContextMenuAttribs();
|
|
chart.highlightExportItem(0);
|
|
};
|
|
chart.exportSVGElements[0].element.setAttribute('role', 'button');
|
|
chart.exportSVGElements[0].element.setAttribute(
|
|
'aria-label',
|
|
'View export menu'
|
|
);
|
|
exportGroupElement.appendChild(chart.exportSVGElements[0].element);
|
|
exportGroupElement.setAttribute('role', 'region');
|
|
exportGroupElement.setAttribute('aria-label', 'Chart export menu');
|
|
parent.appendChild(exportGroupElement);
|
|
}
|
|
|
|
// Set screen reader properties on input boxes for range selector. We need
|
|
// to do this regardless of whether or not these are visible, as they are
|
|
// by default part of the page's tabindex unless we set them to -1.
|
|
if (chart.rangeSelector) {
|
|
each(['minInput', 'maxInput'], function(key, i) {
|
|
if (chart.rangeSelector[key]) {
|
|
chart.rangeSelector[key].setAttribute('tabindex', '-1');
|
|
chart.rangeSelector[key].setAttribute('role', 'textbox');
|
|
chart.rangeSelector[key].setAttribute(
|
|
'aria-label',
|
|
'Select ' + (i ? 'end' : 'start') + ' date.'
|
|
);
|
|
}
|
|
});
|
|
}
|
|
|
|
// Hide text elements from screen readers
|
|
each(textElements, function(el) {
|
|
el.setAttribute('aria-hidden', 'true');
|
|
});
|
|
|
|
// Add top-secret screen reader region
|
|
chart.addScreenReaderRegion(hiddenSectionId, tableId);
|
|
|
|
// Add ID and summary attr to table HTML
|
|
H.wrap(chart, 'getTable', function(proceed) {
|
|
return proceed.apply(this, Array.prototype.slice.call(arguments, 1))
|
|
.replace(
|
|
'<table>',
|
|
'<table id="' + tableId + '" summary="Table representation ' +
|
|
'of chart">'
|
|
);
|
|
});
|
|
});
|
|
|
|
}(Highcharts));
|
|
(function(H) {
|
|
/**
|
|
* Accessibility module - Keyboard navigation
|
|
*
|
|
* (c) 2010-2017 Highsoft AS
|
|
* Author: Oystein Moseng
|
|
*
|
|
* License: www.highcharts.com/license
|
|
*/
|
|
/* eslint max-len: ["warn", 80, 4] */
|
|
|
|
var win = H.win,
|
|
doc = win.document,
|
|
each = H.each,
|
|
addEvent = H.addEvent,
|
|
fireEvent = H.fireEvent,
|
|
merge = H.merge,
|
|
pick = H.pick,
|
|
hasSVGFocusSupport;
|
|
|
|
// Add focus border functionality to SVGElements.
|
|
// Draws a new rect on top of element around its bounding box.
|
|
H.extend(H.SVGElement.prototype, {
|
|
addFocusBorder: function(margin, style) {
|
|
// Allow updating by just adding new border
|
|
if (this.focusBorder) {
|
|
this.removeFocusBorder();
|
|
}
|
|
// Add the border rect
|
|
var bb = this.getBBox(),
|
|
pad = pick(margin, 3);
|
|
this.focusBorder = this.renderer.rect(
|
|
bb.x - pad,
|
|
bb.y - pad,
|
|
bb.width + 2 * pad,
|
|
bb.height + 2 * pad,
|
|
style && style.borderRadius
|
|
)
|
|
.addClass('highcharts-focus-border')
|
|
|
|
.attr({
|
|
stroke: style && style.stroke,
|
|
'stroke-width': style && style.strokeWidth
|
|
})
|
|
|
|
.attr({
|
|
zIndex: 99
|
|
})
|
|
.add(this.parentGroup);
|
|
},
|
|
|
|
removeFocusBorder: function() {
|
|
if (this.focusBorder) {
|
|
this.focusBorder.destroy();
|
|
delete this.focusBorder;
|
|
}
|
|
}
|
|
});
|
|
|
|
|
|
// Set for which series types it makes sense to move to the closest point with
|
|
// up/down arrows, and which series types should just move to next series.
|
|
H.Series.prototype.keyboardMoveVertical = true;
|
|
each(['column', 'pie'], function(type) {
|
|
if (H.seriesTypes[type]) {
|
|
H.seriesTypes[type].prototype.keyboardMoveVertical = false;
|
|
}
|
|
});
|
|
|
|
/**
|
|
* Strip HTML tags away from a string. Used for aria-label attributes, painting
|
|
* on a canvas will fail if the text contains tags.
|
|
* @param {String} s The input string
|
|
* @return {String} The filtered string
|
|
*/
|
|
function stripTags(s) {
|
|
return typeof s === 'string' ? s.replace(/<\/?[^>]+(>|$)/g, '') : s;
|
|
}
|
|
|
|
|
|
H.setOptions({
|
|
accessibility: {
|
|
|
|
/**
|
|
* Options for keyboard navigation.
|
|
*
|
|
* @type {Object}
|
|
* @since 5.0.0
|
|
*/
|
|
keyboardNavigation: {
|
|
|
|
/**
|
|
* Enable keyboard navigation for the chart.
|
|
*
|
|
* @type {Boolean}
|
|
* @default true
|
|
* @since 5.0.0
|
|
*/
|
|
enabled: true,
|
|
|
|
|
|
/**
|
|
* Options for the focus border drawn around elements while
|
|
* navigating through them.
|
|
*
|
|
* @sample highcharts/accessibility/custom-focus
|
|
* Custom focus ring
|
|
* @since 6.0.3
|
|
*/
|
|
focusBorder: {
|
|
/**
|
|
* Enable/disable focus border for chart.
|
|
*/
|
|
enabled: true,
|
|
|
|
/**
|
|
* Hide the browser's default focus indicator.
|
|
*
|
|
* @since 6.0.4
|
|
*/
|
|
hideBrowserFocusOutline: true,
|
|
|
|
/**
|
|
* Style options for the focus border drawn around elements
|
|
* while navigating through them. Note that some browsers in
|
|
* addition draw their own borders for focused elements. These
|
|
* automatic borders can not be styled by Highcharts.
|
|
*
|
|
* In styled mode, the border is given the
|
|
* `.highcharts-focus-border` class.
|
|
*/
|
|
style: {
|
|
color: '#335cad',
|
|
lineWidth: 2,
|
|
borderRadius: 3
|
|
},
|
|
|
|
/**
|
|
* Focus border margin around the elements.
|
|
*/
|
|
margin: 2
|
|
},
|
|
|
|
/**
|
|
* Set the keyboard navigation mode for the chart. Can be "normal"
|
|
* or "serialize". In normal mode, left/right arrow keys move
|
|
* between points in a series, while up/down arrow keys move between
|
|
* series. Up/down navigation acts intelligently to figure out which
|
|
* series makes sense to move to from any given point.
|
|
*
|
|
* In "serialize" mode, points are instead navigated as a single
|
|
* list. Left/right behaves as in "normal" mode. Up/down arrow keys
|
|
* will behave like left/right. This is useful for unifying
|
|
* navigation behavior with/without screen readers enabled.
|
|
*
|
|
* @type {String}
|
|
* @default normal
|
|
* @since 6.0.4
|
|
* @apioption keyboardNavigation.mode
|
|
*/
|
|
|
|
/**
|
|
* Skip null points when navigating through points with the
|
|
* keyboard.
|
|
*
|
|
* @type {Boolean}
|
|
* @since 5.0.0
|
|
*/
|
|
skipNullPoints: true
|
|
}
|
|
}
|
|
});
|
|
|
|
/**
|
|
* Keyboard navigation for the legend. Requires the Accessibility module.
|
|
* @since 5.0.14
|
|
* @apioption legend.keyboardNavigation
|
|
*/
|
|
|
|
/**
|
|
* Enable/disable keyboard navigation for the legend. Requires the Accessibility
|
|
* module.
|
|
*
|
|
* @type {Boolean}
|
|
* @see [accessibility.keyboardNavigation](#accessibility.keyboardNavigation.
|
|
* enabled)
|
|
* @default true
|
|
* @since 5.0.13
|
|
* @apioption legend.keyboardNavigation.enabled
|
|
*/
|
|
|
|
|
|
// Abstraction layer for keyboard navigation. Keep a map of keyCodes to
|
|
// handler functions, and a next/prev move handler for tab order. The
|
|
// module's keyCode handlers determine when to move to another module.
|
|
// Validate holds a function to determine if there are prerequisites for
|
|
// this module to run that are not met. Init holds a function to run once
|
|
// before any keyCodes are interpreted. Terminate holds a function to run
|
|
// once before moving to next/prev module.
|
|
// The chart object keeps track of a list of KeyboardNavigationModules.
|
|
function KeyboardNavigationModule(chart, options) {
|
|
this.chart = chart;
|
|
this.id = options.id;
|
|
this.keyCodeMap = options.keyCodeMap;
|
|
this.validate = options.validate;
|
|
this.init = options.init;
|
|
this.terminate = options.terminate;
|
|
}
|
|
KeyboardNavigationModule.prototype = {
|
|
// Find handler function(s) for key code in the keyCodeMap and run it.
|
|
run: function(e) {
|
|
var navModule = this,
|
|
keyCode = e.which || e.keyCode,
|
|
found = false,
|
|
handled = false;
|
|
each(this.keyCodeMap, function(codeSet) {
|
|
if (codeSet[0].indexOf(keyCode) > -1) {
|
|
found = true;
|
|
handled = codeSet[1].call(navModule, keyCode, e) === false ?
|
|
// If explicitly returning false, we haven't handled it
|
|
false :
|
|
true;
|
|
}
|
|
});
|
|
// Default tab handler, move to next/prev module
|
|
if (!found && keyCode === 9) {
|
|
handled = this.move(e.shiftKey ? -1 : 1);
|
|
}
|
|
return handled;
|
|
},
|
|
|
|
// Move to next/prev valid module, or undefined if none, and init
|
|
// it. Returns true on success and false if there is no valid module
|
|
// to move to.
|
|
move: function(direction) {
|
|
var chart = this.chart;
|
|
if (this.terminate) {
|
|
this.terminate(direction);
|
|
}
|
|
chart.keyboardNavigationModuleIndex += direction;
|
|
var newModule = chart.keyboardNavigationModules[
|
|
chart.keyboardNavigationModuleIndex
|
|
];
|
|
|
|
// Remove existing focus border if any
|
|
if (chart.focusElement) {
|
|
chart.focusElement.removeFocusBorder();
|
|
}
|
|
|
|
// Verify new module
|
|
if (newModule) {
|
|
if (newModule.validate && !newModule.validate()) {
|
|
return this.move(direction); // Invalid module, recurse
|
|
}
|
|
if (newModule.init) {
|
|
newModule.init(direction); // Valid module, init it
|
|
return true;
|
|
}
|
|
}
|
|
// No module
|
|
chart.keyboardNavigationModuleIndex = 0; // Reset counter
|
|
|
|
// Set focus to chart or exit anchor depending on direction
|
|
if (direction > 0) {
|
|
this.chart.exiting = true;
|
|
this.chart.tabExitAnchor.focus();
|
|
} else {
|
|
this.chart.renderTo.focus();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
};
|
|
|
|
|
|
// Utility function to attempt to fake a click event on an element
|
|
function fakeClickEvent(element) {
|
|
var fakeEvent;
|
|
if (element && element.onclick && doc.createEvent) {
|
|
fakeEvent = doc.createEvent('Events');
|
|
fakeEvent.initEvent('click', true, false);
|
|
element.onclick(fakeEvent);
|
|
}
|
|
}
|
|
|
|
|
|
// Determine if a point should be skipped
|
|
function isSkipPoint(point) {
|
|
var a11yOptions = point.series.chart.options.accessibility;
|
|
return point.isNull && a11yOptions.keyboardNavigation.skipNullPoints ||
|
|
point.series.options.skipKeyboardNavigation ||
|
|
!point.series.visible ||
|
|
point.visible === false ||
|
|
// Skip all points in a series where pointDescriptionThreshold is
|
|
// reached
|
|
(a11yOptions.pointDescriptionThreshold &&
|
|
a11yOptions.pointDescriptionThreshold <= point.series.points.length);
|
|
}
|
|
|
|
|
|
// Get the point in a series that is closest (in distance) to a reference point
|
|
// Optionally supply weight factors for x and y directions
|
|
function getClosestPoint(point, series, xWeight, yWeight) {
|
|
var minDistance = Infinity,
|
|
dPoint,
|
|
minIx,
|
|
distance,
|
|
i = series.points.length;
|
|
if (point.plotX === undefined || point.plotY === undefined) {
|
|
return;
|
|
}
|
|
while (i--) {
|
|
dPoint = series.points[i];
|
|
if (dPoint.plotX === undefined || dPoint.plotY === undefined) {
|
|
continue;
|
|
}
|
|
distance = (point.plotX - dPoint.plotX) *
|
|
(point.plotX - dPoint.plotX) * (xWeight || 1) +
|
|
(point.plotY - dPoint.plotY) *
|
|
(point.plotY - dPoint.plotY) * (yWeight || 1);
|
|
if (distance < minDistance) {
|
|
minDistance = distance;
|
|
minIx = i;
|
|
}
|
|
}
|
|
return minIx !== undefined && series.points[minIx];
|
|
}
|
|
|
|
|
|
// Pan along axis in a direction (1 or -1), optionally with a defined
|
|
// granularity (number of steps it takes to walk across current view)
|
|
H.Axis.prototype.panStep = function(direction, granularity) {
|
|
var gran = granularity || 3,
|
|
extremes = this.getExtremes(),
|
|
step = (extremes.max - extremes.min) / gran * direction,
|
|
newMax = extremes.max + step,
|
|
newMin = extremes.min + step,
|
|
size = newMax - newMin;
|
|
if (direction < 0 && newMin < extremes.dataMin) {
|
|
newMin = extremes.dataMin;
|
|
newMax = newMin + size;
|
|
} else if (direction > 0 && newMax > extremes.dataMax) {
|
|
newMax = extremes.dataMax;
|
|
newMin = newMax - size;
|
|
}
|
|
this.setExtremes(newMin, newMax);
|
|
};
|
|
|
|
|
|
// Set chart's focus to an SVGElement. Calls focus() on it, and draws the focus
|
|
// border. If the focusElement argument is supplied, it draws the border around
|
|
// svgElement and sets the focus to focusElement.
|
|
H.Chart.prototype.setFocusToElement = function(svgElement, focusElement) {
|
|
var focusBorderOptions = this.options.accessibility
|
|
.keyboardNavigation.focusBorder,
|
|
browserFocusElement = focusElement || svgElement;
|
|
// Set browser focus if possible
|
|
if (
|
|
browserFocusElement.element &&
|
|
browserFocusElement.element.focus
|
|
) {
|
|
browserFocusElement.element.focus();
|
|
// Hide default focus ring
|
|
if (focusBorderOptions.hideBrowserFocusOutline) {
|
|
browserFocusElement.css({
|
|
outline: 'none'
|
|
});
|
|
}
|
|
}
|
|
if (focusBorderOptions.enabled && svgElement !== this.focusElement) {
|
|
// Remove old focus border
|
|
if (this.focusElement) {
|
|
this.focusElement.removeFocusBorder();
|
|
}
|
|
// Draw focus border (since some browsers don't do it automatically)
|
|
svgElement.addFocusBorder(focusBorderOptions.margin, {
|
|
stroke: focusBorderOptions.style.color,
|
|
strokeWidth: focusBorderOptions.style.lineWidth,
|
|
borderRadius: focusBorderOptions.style.borderRadius
|
|
});
|
|
this.focusElement = svgElement;
|
|
}
|
|
};
|
|
|
|
|
|
// Highlight a point (show tooltip and display hover state). Returns the
|
|
// highlighted point.
|
|
H.Point.prototype.highlight = function() {
|
|
var chart = this.series.chart;
|
|
if (!this.isNull) {
|
|
this.onMouseOver(); // Show the hover marker and tooltip
|
|
} else {
|
|
if (chart.tooltip) {
|
|
chart.tooltip.hide(0);
|
|
}
|
|
// Don't call blur on the element, as it messes up the chart div's focus
|
|
}
|
|
|
|
// We focus only after calling onMouseOver because the state change can
|
|
// change z-index and mess up the element.
|
|
if (this.graphic) {
|
|
chart.setFocusToElement(this.graphic);
|
|
}
|
|
|
|
chart.highlightedPoint = this;
|
|
return this;
|
|
};
|
|
|
|
|
|
// Function to highlight next/previous point in chart
|
|
// Returns highlighted point on success, false on failure (no adjacent point to
|
|
// highlight in chosen direction)
|
|
H.Chart.prototype.highlightAdjacentPoint = function(next) {
|
|
var chart = this,
|
|
series = chart.series,
|
|
curPoint = chart.highlightedPoint,
|
|
curPointIndex = curPoint && curPoint.index || 0,
|
|
curPoints = curPoint && curPoint.series.points,
|
|
lastSeries = chart.series && chart.series[chart.series.length - 1],
|
|
lastPoint = lastSeries && lastSeries.points &&
|
|
lastSeries.points[lastSeries.points.length - 1],
|
|
newSeries,
|
|
newPoint;
|
|
|
|
// If no points, return false
|
|
if (!series[0] || !series[0].points) {
|
|
return false;
|
|
}
|
|
|
|
if (!curPoint) {
|
|
// No point is highlighted yet. Try first/last point depending on move
|
|
// direction
|
|
newPoint = next ? series[0].points[0] : lastPoint;
|
|
} else {
|
|
// We have a highlighted point.
|
|
// Find index of current point in series.points array. Necessary for
|
|
// dataGrouping (and maybe zoom?)
|
|
if (curPoints[curPointIndex] !== curPoint) {
|
|
for (var i = 0; i < curPoints.length; ++i) {
|
|
if (curPoints[i] === curPoint) {
|
|
curPointIndex = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Grab next/prev point & series
|
|
newSeries = series[curPoint.series.index + (next ? 1 : -1)];
|
|
newPoint = curPoints[curPointIndex + (next ? 1 : -1)] ||
|
|
// Done with this series, try next one
|
|
newSeries &&
|
|
newSeries.points[next ? 0 : newSeries.points.length - 1];
|
|
|
|
// If there is no adjacent point, we return false
|
|
if (!newPoint) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Recursively skip null points or points in series that should be skipped
|
|
if (isSkipPoint(newPoint)) {
|
|
chart.highlightedPoint = newPoint;
|
|
return chart.highlightAdjacentPoint(next);
|
|
}
|
|
|
|
// There is an adjacent point, highlight it
|
|
return newPoint.highlight();
|
|
};
|
|
|
|
|
|
// Highlight first valid point in a series. Returns the point if successfully
|
|
// highlighted, otherwise false. If there is a highlighted point in the series,
|
|
// use that as starting point.
|
|
H.Series.prototype.highlightFirstValidPoint = function() {
|
|
var curPoint = this.chart.highlightedPoint,
|
|
start = (curPoint && curPoint.series) === this ? curPoint.index : 0,
|
|
points = this.points;
|
|
|
|
if (points) {
|
|
for (var i = start, len = points.length; i < len; ++i) {
|
|
if (!isSkipPoint(points[i])) {
|
|
return points[i].highlight();
|
|
}
|
|
}
|
|
for (var j = start; j >= 0; --j) {
|
|
if (!isSkipPoint(points[j])) {
|
|
return points[j].highlight();
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
// Highlight next/previous series in chart. Returns false if no adjacent series
|
|
// in the direction, otherwise returns new highlighted point.
|
|
H.Chart.prototype.highlightAdjacentSeries = function(down) {
|
|
var chart = this,
|
|
newSeries,
|
|
newPoint,
|
|
adjacentNewPoint,
|
|
curPoint = chart.highlightedPoint,
|
|
lastSeries = chart.series && chart.series[chart.series.length - 1],
|
|
lastPoint = lastSeries && lastSeries.points &&
|
|
lastSeries.points[lastSeries.points.length - 1];
|
|
|
|
// If no point is highlighted, highlight the first/last point
|
|
if (!chart.highlightedPoint) {
|
|
newSeries = down ? (chart.series && chart.series[0]) : lastSeries;
|
|
newPoint = down ?
|
|
(newSeries && newSeries.points && newSeries.points[0]) : lastPoint;
|
|
return newPoint ? newPoint.highlight() : false;
|
|
}
|
|
|
|
newSeries = chart.series[curPoint.series.index + (down ? -1 : 1)];
|
|
|
|
if (!newSeries) {
|
|
return false;
|
|
}
|
|
|
|
// We have a new series in this direction, find the right point
|
|
// Weigh xDistance as counting much higher than Y distance
|
|
newPoint = getClosestPoint(curPoint, newSeries, 4);
|
|
|
|
if (!newPoint) {
|
|
return false;
|
|
}
|
|
|
|
// New series and point exists, but we might want to skip it
|
|
if (!newSeries.visible) {
|
|
// Skip the series
|
|
newPoint.highlight();
|
|
adjacentNewPoint = chart.highlightAdjacentSeries(down); // Try recurse
|
|
if (!adjacentNewPoint) {
|
|
// Recurse failed
|
|
curPoint.highlight();
|
|
return false;
|
|
}
|
|
// Recurse succeeded
|
|
return adjacentNewPoint;
|
|
}
|
|
|
|
// Highlight the new point or any first valid point back or forwards from it
|
|
newPoint.highlight();
|
|
return newPoint.series.highlightFirstValidPoint();
|
|
};
|
|
|
|
|
|
// Highlight the closest point vertically
|
|
H.Chart.prototype.highlightAdjacentPointVertical = function(down) {
|
|
var curPoint = this.highlightedPoint,
|
|
minDistance = Infinity,
|
|
bestPoint;
|
|
|
|
if (curPoint.plotX === undefined || curPoint.plotY === undefined) {
|
|
return false;
|
|
}
|
|
each(this.series, function(series) {
|
|
each(series.points, function(point) {
|
|
if (point.plotY === undefined || point.plotX === undefined ||
|
|
point === curPoint) {
|
|
return;
|
|
}
|
|
var yDistance = point.plotY - curPoint.plotY,
|
|
width = Math.abs(point.plotX - curPoint.plotX),
|
|
distance = Math.abs(yDistance) * Math.abs(yDistance) +
|
|
width * width * 4; // Weigh horizontal distance highly
|
|
|
|
// Reverse distance number if axis is reversed
|
|
if (series.yAxis.reversed) {
|
|
yDistance *= -1;
|
|
}
|
|
|
|
if (
|
|
yDistance < 0 && down || yDistance > 0 && !down || // Wrong dir
|
|
distance < 5 || // Points in same spot => infinite loop
|
|
isSkipPoint(point)
|
|
) {
|
|
return;
|
|
}
|
|
|
|
if (distance < minDistance) {
|
|
minDistance = distance;
|
|
bestPoint = point;
|
|
}
|
|
});
|
|
});
|
|
|
|
return bestPoint ? bestPoint.highlight() : false;
|
|
};
|
|
|
|
|
|
// Show the export menu and focus the first item (if exists)
|
|
H.Chart.prototype.showExportMenu = function() {
|
|
if (this.exportSVGElements && this.exportSVGElements[0]) {
|
|
this.exportSVGElements[0].element.onclick();
|
|
this.highlightExportItem(0);
|
|
}
|
|
};
|
|
|
|
|
|
// Hide export menu
|
|
H.Chart.prototype.hideExportMenu = function() {
|
|
var exportList = this.exportDivElements;
|
|
if (exportList) {
|
|
each(exportList, function(el) {
|
|
fireEvent(el, 'mouseleave');
|
|
});
|
|
if (
|
|
exportList[this.highlightedExportItem] &&
|
|
exportList[this.highlightedExportItem].onmouseout
|
|
) {
|
|
exportList[this.highlightedExportItem].onmouseout();
|
|
}
|
|
this.highlightedExportItem = 0;
|
|
if (hasSVGFocusSupport) {
|
|
// Only focus if we can set focus back to the elements after
|
|
// destroying the menu (#7422)
|
|
this.renderTo.focus();
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
// Highlight export menu item by index
|
|
H.Chart.prototype.highlightExportItem = function(ix) {
|
|
var listItem = this.exportDivElements && this.exportDivElements[ix],
|
|
curHighlighted =
|
|
this.exportDivElements &&
|
|
this.exportDivElements[this.highlightedExportItem];
|
|
|
|
if (
|
|
listItem &&
|
|
listItem.tagName === 'DIV' &&
|
|
!(listItem.children && listItem.children.length)
|
|
) {
|
|
if (listItem.focus && hasSVGFocusSupport) {
|
|
// Only focus if we can set focus back to the elements after
|
|
// destroying the menu (#7422)
|
|
listItem.focus();
|
|
}
|
|
if (curHighlighted && curHighlighted.onmouseout) {
|
|
curHighlighted.onmouseout();
|
|
}
|
|
if (listItem.onmouseover) {
|
|
listItem.onmouseover();
|
|
}
|
|
this.highlightedExportItem = ix;
|
|
return true;
|
|
}
|
|
};
|
|
|
|
|
|
// Try to highlight the last valid export menu item
|
|
H.Chart.prototype.highlightLastExportItem = function() {
|
|
var chart = this,
|
|
i;
|
|
if (chart.exportDivElements) {
|
|
i = chart.exportDivElements.length;
|
|
while (i--) {
|
|
if (chart.highlightExportItem(i)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
// Highlight range selector button by index
|
|
H.Chart.prototype.highlightRangeSelectorButton = function(ix) {
|
|
var buttons = this.rangeSelector.buttons;
|
|
// Deselect old
|
|
if (buttons[this.highlightedRangeSelectorItemIx]) {
|
|
buttons[this.highlightedRangeSelectorItemIx].setState(
|
|
this.oldRangeSelectorItemState || 0
|
|
);
|
|
}
|
|
// Select new
|
|
this.highlightedRangeSelectorItemIx = ix;
|
|
if (buttons[ix]) {
|
|
this.setFocusToElement(buttons[ix].box, buttons[ix]);
|
|
this.oldRangeSelectorItemState = buttons[ix].state;
|
|
buttons[ix].setState(2);
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
// Highlight legend item by index
|
|
H.Chart.prototype.highlightLegendItem = function(ix) {
|
|
var items = this.legend.allItems,
|
|
oldIx = this.highlightedLegendItemIx;
|
|
if (items[ix]) {
|
|
if (items[oldIx]) {
|
|
fireEvent(
|
|
items[oldIx].legendGroup.element,
|
|
'mouseout'
|
|
);
|
|
}
|
|
// Scroll if we have to
|
|
if (items[ix].pageIx !== undefined &&
|
|
items[ix].pageIx + 1 !== this.legend.currentPage) {
|
|
this.legend.scroll(1 + items[ix].pageIx - this.legend.currentPage);
|
|
}
|
|
// Focus
|
|
this.highlightedLegendItemIx = ix;
|
|
this.setFocusToElement(items[ix].legendItem, items[ix].legendGroup);
|
|
fireEvent(items[ix].legendGroup.element, 'mouseover');
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
// Add keyboard navigation handling modules to chart
|
|
H.Chart.prototype.addKeyboardNavigationModules = function() {
|
|
var chart = this;
|
|
|
|
function navModuleFactory(id, keyMap, options) {
|
|
return new KeyboardNavigationModule(chart, merge({
|
|
keyCodeMap: keyMap
|
|
}, {
|
|
id: id
|
|
}, options));
|
|
}
|
|
|
|
// List of the different keyboard handling modes we use depending on where
|
|
// we are in the chart. Each mode has a set of handling functions mapped to
|
|
// key codes. Each mode determines when to move to the next/prev mode.
|
|
chart.keyboardNavigationModules = [
|
|
// Entry point catching the first tab, allowing users to tab into points
|
|
// more intuitively.
|
|
navModuleFactory('entry', []),
|
|
|
|
// Points
|
|
navModuleFactory('points', [
|
|
// Left/Right
|
|
[
|
|
[37, 39],
|
|
function(keyCode) {
|
|
var right = keyCode === 39;
|
|
if (!chart.highlightAdjacentPoint(right)) {
|
|
// Failed to highlight next, wrap to last/first
|
|
return this.init(right ? 1 : -1);
|
|
}
|
|
return true;
|
|
}
|
|
],
|
|
// Up/Down
|
|
[
|
|
[38, 40],
|
|
function(keyCode) {
|
|
var down = keyCode !== 38,
|
|
navOptions = chart.options.accessibility.keyboardNavigation;
|
|
if (navOptions.mode && navOptions.mode === 'serialize') {
|
|
// Act like left/right
|
|
if (!chart.highlightAdjacentPoint(down)) {
|
|
return this.init(down ? 1 : -1);
|
|
}
|
|
return true;
|
|
}
|
|
// Normal mode, move between series
|
|
var highlightMethod = chart.highlightedPoint &&
|
|
chart.highlightedPoint.series.keyboardMoveVertical ?
|
|
'highlightAdjacentPointVertical' :
|
|
'highlightAdjacentSeries';
|
|
chart[highlightMethod](down);
|
|
return true;
|
|
}
|
|
],
|
|
// Enter/Spacebar
|
|
[
|
|
[13, 32],
|
|
function() {
|
|
if (chart.highlightedPoint) {
|
|
chart.highlightedPoint.firePointEvent('click');
|
|
}
|
|
}
|
|
]
|
|
], {
|
|
// Always start highlighting from scratch when entering this module
|
|
init: function(dir) {
|
|
var numSeries = chart.series.length,
|
|
i = dir > 0 ? 0 : numSeries,
|
|
res;
|
|
if (dir > 0) {
|
|
delete chart.highlightedPoint;
|
|
// Find first valid point to highlight
|
|
while (i < numSeries) {
|
|
res = chart.series[i].highlightFirstValidPoint();
|
|
if (res) {
|
|
return res;
|
|
}
|
|
++i;
|
|
}
|
|
} else {
|
|
// Find last valid point to highlight
|
|
while (i--) {
|
|
chart.highlightedPoint = chart.series[i].points[
|
|
chart.series[i].points.length - 1
|
|
];
|
|
// Highlight first valid point in the series will also
|
|
// look backwards. It always starts from currently
|
|
// highlighted point.
|
|
res = chart.series[i].highlightFirstValidPoint();
|
|
if (res) {
|
|
return res;
|
|
}
|
|
}
|
|
}
|
|
},
|
|
// If leaving points, don't show tooltip anymore
|
|
terminate: function() {
|
|
if (chart.tooltip) {
|
|
chart.tooltip.hide(0);
|
|
}
|
|
delete chart.highlightedPoint;
|
|
}
|
|
}),
|
|
|
|
// Exporting
|
|
navModuleFactory('exporting', [
|
|
// Left/Up
|
|
[
|
|
[37, 38],
|
|
function() {
|
|
var i = chart.highlightedExportItem || 0,
|
|
reachedEnd = true;
|
|
// Try to highlight prev item in list. Highlighting e.g.
|
|
// separators will fail.
|
|
while (i--) {
|
|
if (chart.highlightExportItem(i)) {
|
|
reachedEnd = false;
|
|
break;
|
|
}
|
|
}
|
|
if (reachedEnd) {
|
|
chart.highlightLastExportItem();
|
|
return true;
|
|
}
|
|
}
|
|
],
|
|
// Right/Down
|
|
[
|
|
[39, 40],
|
|
function() {
|
|
var highlightedExportItem = chart.highlightedExportItem || 0,
|
|
reachedEnd = true;
|
|
// Try to highlight next item in list. Highlighting e.g.
|
|
// separators will fail.
|
|
for (
|
|
var i = highlightedExportItem + 1; i < chart.exportDivElements.length;
|
|
++i
|
|
) {
|
|
if (chart.highlightExportItem(i)) {
|
|
reachedEnd = false;
|
|
break;
|
|
}
|
|
}
|
|
if (reachedEnd) {
|
|
chart.highlightExportItem(0);
|
|
return true;
|
|
}
|
|
}
|
|
],
|
|
// Enter/Spacebar
|
|
[
|
|
[13, 32],
|
|
function() {
|
|
fakeClickEvent(
|
|
chart.exportDivElements[chart.highlightedExportItem]
|
|
);
|
|
}
|
|
]
|
|
], {
|
|
// Only run exporting navigation if exporting support exists and is
|
|
// enabled on chart
|
|
validate: function() {
|
|
return (
|
|
chart.exportChart &&
|
|
!(
|
|
chart.options.exporting &&
|
|
chart.options.exporting.enabled === false
|
|
)
|
|
);
|
|
},
|
|
// Show export menu
|
|
init: function(direction) {
|
|
chart.highlightedPoint = null;
|
|
chart.showExportMenu();
|
|
// If coming back to export menu from other module, try to
|
|
// highlight last item in menu
|
|
if (direction < 0) {
|
|
chart.highlightLastExportItem();
|
|
}
|
|
},
|
|
// Hide the menu
|
|
terminate: function() {
|
|
chart.hideExportMenu();
|
|
}
|
|
}),
|
|
|
|
// Map zoom
|
|
navModuleFactory('mapZoom', [
|
|
// Up/down/left/right
|
|
[
|
|
[38, 40, 37, 39],
|
|
function(keyCode) {
|
|
chart[keyCode === 38 || keyCode === 40 ? 'yAxis' : 'xAxis'][0]
|
|
.panStep(keyCode < 39 ? -1 : 1);
|
|
}
|
|
],
|
|
|
|
// Tabs
|
|
[
|
|
[9],
|
|
function(keyCode, e) {
|
|
var button;
|
|
// Deselect old
|
|
chart.mapNavButtons[chart.focusedMapNavButtonIx].setState(0);
|
|
if (
|
|
e.shiftKey && !chart.focusedMapNavButtonIx ||
|
|
!e.shiftKey && chart.focusedMapNavButtonIx
|
|
) { // trying to go somewhere we can't?
|
|
chart.mapZoom(); // Reset zoom
|
|
// Nowhere to go, go to prev/next module
|
|
return this.move(e.shiftKey ? -1 : 1);
|
|
}
|
|
chart.focusedMapNavButtonIx += e.shiftKey ? -1 : 1;
|
|
button = chart.mapNavButtons[chart.focusedMapNavButtonIx];
|
|
chart.setFocusToElement(button.box, button);
|
|
button.setState(2);
|
|
}
|
|
],
|
|
|
|
// Enter/Spacebar
|
|
[
|
|
[13, 32],
|
|
function() {
|
|
fakeClickEvent(
|
|
chart.mapNavButtons[chart.focusedMapNavButtonIx].element
|
|
);
|
|
}
|
|
]
|
|
], {
|
|
// Only run this module if we have map zoom on the chart
|
|
validate: function() {
|
|
return (
|
|
chart.mapZoom &&
|
|
chart.mapNavButtons &&
|
|
chart.mapNavButtons.length === 2
|
|
);
|
|
},
|
|
|
|
// Make zoom buttons do their magic
|
|
init: function(direction) {
|
|
var zoomIn = chart.mapNavButtons[0],
|
|
zoomOut = chart.mapNavButtons[1],
|
|
initialButton = direction > 0 ? zoomIn : zoomOut;
|
|
|
|
each(chart.mapNavButtons, function(button, i) {
|
|
button.element.setAttribute('tabindex', -1);
|
|
button.element.setAttribute('role', 'button');
|
|
button.element.setAttribute(
|
|
'aria-label',
|
|
'Zoom ' + (i ? 'out ' : '') + 'chart'
|
|
);
|
|
});
|
|
|
|
chart.setFocusToElement(initialButton.box, initialButton);
|
|
initialButton.setState(2);
|
|
chart.focusedMapNavButtonIx = direction > 0 ? 0 : 1;
|
|
}
|
|
}),
|
|
|
|
// Highstock range selector (minus input boxes)
|
|
navModuleFactory('rangeSelector', [
|
|
// Left/Right/Up/Down
|
|
[
|
|
[37, 39, 38, 40],
|
|
function(keyCode) {
|
|
var direction = (keyCode === 37 || keyCode === 38) ? -1 : 1;
|
|
// Try to highlight next/prev button
|
|
if (!chart.highlightRangeSelectorButton(
|
|
chart.highlightedRangeSelectorItemIx + direction
|
|
)) {
|
|
return this.move(direction);
|
|
}
|
|
}
|
|
],
|
|
// Enter/Spacebar
|
|
[
|
|
[13, 32],
|
|
function() {
|
|
// Don't allow click if button used to be disabled
|
|
if (chart.oldRangeSelectorItemState !== 3) {
|
|
fakeClickEvent(
|
|
chart.rangeSelector.buttons[
|
|
chart.highlightedRangeSelectorItemIx
|
|
].element
|
|
);
|
|
}
|
|
}
|
|
]
|
|
], {
|
|
// Only run this module if we have range selector
|
|
validate: function() {
|
|
return (
|
|
chart.rangeSelector &&
|
|
chart.rangeSelector.buttons &&
|
|
chart.rangeSelector.buttons.length
|
|
);
|
|
},
|
|
|
|
// Make elements focusable and accessible
|
|
init: function(direction) {
|
|
each(chart.rangeSelector.buttons, function(button) {
|
|
button.element.setAttribute('tabindex', '-1');
|
|
button.element.setAttribute('role', 'button');
|
|
button.element.setAttribute(
|
|
'aria-label',
|
|
'Select range ' + (button.text && button.text.textStr)
|
|
);
|
|
});
|
|
// Focus first/last button
|
|
chart.highlightRangeSelectorButton(
|
|
direction > 0 ? 0 : chart.rangeSelector.buttons.length - 1
|
|
);
|
|
}
|
|
}),
|
|
|
|
// Highstock range selector, input boxes
|
|
navModuleFactory('rangeSelectorInput', [
|
|
// Tab/Up/Down
|
|
[
|
|
[9, 38, 40],
|
|
function(keyCode, e) {
|
|
var direction =
|
|
(keyCode === 9 && e.shiftKey || keyCode === 38) ? -1 : 1,
|
|
|
|
newIx = chart.highlightedInputRangeIx =
|
|
chart.highlightedInputRangeIx + direction;
|
|
|
|
// Try to highlight next/prev item in list.
|
|
if (newIx > 1 || newIx < 0) { // Out of range
|
|
return this.move(direction);
|
|
}
|
|
chart.rangeSelector[newIx ? 'maxInput' : 'minInput'].focus();
|
|
}
|
|
]
|
|
], {
|
|
// Only run if we have range selector with input boxes
|
|
validate: function() {
|
|
var inputVisible = (
|
|
chart.rangeSelector &&
|
|
chart.rangeSelector.inputGroup &&
|
|
chart.rangeSelector.inputGroup.element
|
|
.getAttribute('visibility') !== 'hidden'
|
|
);
|
|
return (
|
|
inputVisible &&
|
|
chart.options.rangeSelector.inputEnabled !== false &&
|
|
chart.rangeSelector.minInput &&
|
|
chart.rangeSelector.maxInput
|
|
);
|
|
},
|
|
|
|
// Highlight first/last input box
|
|
init: function(direction) {
|
|
chart.highlightedInputRangeIx = direction > 0 ? 0 : 1;
|
|
chart.rangeSelector[
|
|
chart.highlightedInputRangeIx ? 'maxInput' : 'minInput'
|
|
].focus();
|
|
}
|
|
}),
|
|
|
|
// Legend navigation
|
|
navModuleFactory('legend', [
|
|
// Left/Right/Up/Down
|
|
[
|
|
[37, 39, 38, 40],
|
|
function(keyCode) {
|
|
var direction = (keyCode === 37 || keyCode === 38) ? -1 : 1;
|
|
// Try to highlight next/prev legend item
|
|
if (!chart.highlightLegendItem(
|
|
chart.highlightedLegendItemIx + direction
|
|
)) {
|
|
this.init(direction);
|
|
}
|
|
}
|
|
],
|
|
// Enter/Spacebar
|
|
[
|
|
[13, 32],
|
|
function() {
|
|
fakeClickEvent(
|
|
chart.legend.allItems[
|
|
chart.highlightedLegendItemIx
|
|
].legendItem.element.parentNode
|
|
);
|
|
}
|
|
]
|
|
], {
|
|
// Only run this module if we have at least one legend - wait for
|
|
// it - item. Don't run if the legend is populated by a colorAxis.
|
|
// Don't run if legend navigation is disabled.
|
|
validate: function() {
|
|
return chart.legend && chart.legend.allItems &&
|
|
chart.legend.display &&
|
|
!(chart.colorAxis && chart.colorAxis.length) &&
|
|
(chart.options.legend &&
|
|
chart.options.legend.keyboardNavigation &&
|
|
chart.options.legend.keyboardNavigation.enabled) !== false;
|
|
},
|
|
|
|
// Make elements focusable and accessible
|
|
init: function(direction) {
|
|
each(chart.legend.allItems, function(item) {
|
|
item.legendGroup.element.setAttribute('tabindex', '-1');
|
|
item.legendGroup.element.setAttribute('role', 'button');
|
|
item.legendGroup.element.setAttribute(
|
|
'aria-label',
|
|
stripTags('Toggle visibility of series ' + item.name)
|
|
);
|
|
});
|
|
// Focus first/last item
|
|
chart.highlightLegendItem(
|
|
direction > 0 ? 0 : chart.legend.allItems.length - 1
|
|
);
|
|
}
|
|
})
|
|
];
|
|
};
|
|
|
|
|
|
// Add exit anchor to the chart
|
|
// We use this to move focus out of chart whenever we want, by setting focus
|
|
// to this div and not preventing the default tab action.
|
|
// We also use this when users come back into the chart by tabbing back, in
|
|
// order to navigate from the end of the chart.
|
|
// Function returns the unbind function for the exit anchor's event handler.
|
|
H.Chart.prototype.addExitAnchor = function() {
|
|
var chart = this;
|
|
chart.tabExitAnchor = doc.createElement('div');
|
|
chart.tabExitAnchor.setAttribute('tabindex', '0');
|
|
|
|
// Hide exit anchor
|
|
merge(true, chart.tabExitAnchor.style, {
|
|
position: 'absolute',
|
|
left: '-9999px',
|
|
top: 'auto',
|
|
width: '1px',
|
|
height: '1px',
|
|
overflow: 'hidden'
|
|
});
|
|
|
|
chart.renderTo.appendChild(chart.tabExitAnchor);
|
|
return addEvent(chart.tabExitAnchor, 'focus',
|
|
function(ev) {
|
|
var e = ev || win.event,
|
|
curModule;
|
|
|
|
// If focusing and we are exiting, do nothing once.
|
|
if (!chart.exiting) {
|
|
|
|
// Not exiting, means we are coming in backwards
|
|
chart.renderTo.focus();
|
|
e.preventDefault();
|
|
|
|
// Move to last valid keyboard nav module
|
|
// Note the we don't run it, just set the index
|
|
chart.keyboardNavigationModuleIndex =
|
|
chart.keyboardNavigationModules.length - 1;
|
|
curModule = chart.keyboardNavigationModules[
|
|
chart.keyboardNavigationModuleIndex
|
|
];
|
|
|
|
// Validate the module
|
|
if (curModule.validate && !curModule.validate()) {
|
|
// Invalid.
|
|
// Move inits next valid module in direction
|
|
curModule.move(-1);
|
|
} else {
|
|
// We have a valid module, init it
|
|
curModule.init(-1);
|
|
}
|
|
|
|
} else {
|
|
// Don't skip the next focus, we only skip once.
|
|
chart.exiting = false;
|
|
}
|
|
}
|
|
);
|
|
};
|
|
|
|
|
|
// Clear the chart and reset the navigation state
|
|
H.Chart.prototype.resetKeyboardNavigation = function() {
|
|
var chart = this,
|
|
curMod = chart.keyboardNavigationModules[
|
|
chart.keyboardNavigationModuleIndex || 0
|
|
];
|
|
if (curMod && curMod.terminate) {
|
|
curMod.terminate();
|
|
}
|
|
if (chart.focusElement) {
|
|
chart.focusElement.removeFocusBorder();
|
|
}
|
|
chart.keyboardNavigationModuleIndex = 0;
|
|
chart.keyboardReset = true;
|
|
};
|
|
|
|
|
|
/**
|
|
* On destroy, we need to clean up the focus border and the state
|
|
*/
|
|
H.wrap(H.Series.prototype, 'destroy', function(proceed) {
|
|
var chart = this.chart;
|
|
if (chart.highlightedPoint && chart.highlightedPoint.series === this) {
|
|
delete chart.highlightedPoint;
|
|
if (chart.focusElement) {
|
|
chart.focusElement.removeFocusBorder();
|
|
}
|
|
}
|
|
proceed.apply(this, Array.prototype.slice.call(arguments, 1));
|
|
});
|
|
|
|
|
|
// Add keyboard navigation events on chart load
|
|
H.Chart.prototype.callbacks.push(function(chart) {
|
|
var a11yOptions = chart.options.accessibility;
|
|
if (a11yOptions.enabled && a11yOptions.keyboardNavigation.enabled) {
|
|
|
|
// Test if we have focus support for SVG elements
|
|
hasSVGFocusSupport = !!chart.renderTo
|
|
.getElementsByTagName('g')[0].focus;
|
|
|
|
// Init nav modules. We start at the first module, and as the user
|
|
// navigates through the chart the index will increase to use different
|
|
// handler modules.
|
|
chart.addKeyboardNavigationModules();
|
|
chart.keyboardNavigationModuleIndex = 0;
|
|
|
|
// Make chart container reachable by tab
|
|
if (
|
|
chart.container.hasAttribute &&
|
|
!chart.container.hasAttribute('tabIndex')
|
|
) {
|
|
chart.container.setAttribute('tabindex', '0');
|
|
}
|
|
|
|
// Add tab exit anchor
|
|
if (!chart.tabExitAnchor) {
|
|
chart.unbindExitAnchorFocus = chart.addExitAnchor();
|
|
}
|
|
|
|
// Handle keyboard events by routing them to active keyboard nav module
|
|
chart.unbindKeydownHandler = addEvent(chart.renderTo, 'keydown',
|
|
function(ev) {
|
|
var e = ev || win.event,
|
|
curNavModule = chart.keyboardNavigationModules[
|
|
chart.keyboardNavigationModuleIndex
|
|
];
|
|
chart.keyboardReset = false;
|
|
// If there is a nav module for the current index, run it.
|
|
// Otherwise, we are outside of the chart in some direction.
|
|
if (curNavModule) {
|
|
if (curNavModule.run(e)) {
|
|
// Successfully handled this key event, stop default
|
|
e.preventDefault();
|
|
}
|
|
}
|
|
});
|
|
|
|
// Reset chart navigation state if we click outside the chart and it's
|
|
// not already reset
|
|
chart.unbindBlurHandler = addEvent(doc, 'mouseup', function() {
|
|
if (!chart.keyboardReset && !chart.pointer.chartPosition) {
|
|
chart.resetKeyboardNavigation();
|
|
}
|
|
});
|
|
|
|
// Add cleanup handlers
|
|
addEvent(chart, 'destroy', function() {
|
|
chart.resetKeyboardNavigation();
|
|
if (chart.unbindExitAnchorFocus && chart.tabExitAnchor) {
|
|
chart.unbindExitAnchorFocus();
|
|
}
|
|
if (chart.unbindKeydownHandler && chart.renderTo) {
|
|
chart.unbindKeydownHandler();
|
|
}
|
|
if (chart.unbindBlurHandler) {
|
|
chart.unbindBlurHandler();
|
|
}
|
|
});
|
|
}
|
|
});
|
|
|
|
}(Highcharts));
|
|
}));
|