/**
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* @license Highcharts JS v5.0.6 (2016-12-07)
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* Accessibility module
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*
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* (c) 2010-2016 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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(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
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*
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* (c) 2010-2016 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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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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removeEvent = H.removeEvent,
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fireEvent = H.fireEvent,
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dateFormat = H.dateFormat,
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merge = H.merge,
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// Human readable description of series and each point in singular and 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': ['areasplinerange series', 'data point', 'data points'],
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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 statistical data. ' +
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'Each data point in the chart can have up to 5 values: minimum, lower quartile, median, upper quartile and maximum. ',
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arearange: ' Arearange charts are line charts displaying a range between a lower and higher value for each point. ',
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areasplinerange: ' These charts are line charts displaying a range between a lower and higher value for each point. ',
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bubble: ' Bubble charts are scatter charts where each data point also has a size value. ',
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columnrange: ' Columnrange charts are column charts displaying a range between a lower and higher value for each point. ',
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errorbar: ' Errorbar series are used to display the variability of the data. ',
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funnel: ' Funnel charts are used to display reduction of data in stages. ',
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pyramid: ' Pyramid charts consist of a single pyramid with item heights corresponding to each point value. ',
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waterfall: ' A waterfall chart is a column chart where each column contributes towards a total end value. '
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},
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commonKeys = ['name', 'id', 'category', 'x', 'value', 'y'],
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specialKeys = ['z', 'open', 'high', 'q3', 'median', 'q1', 'low', 'close']; // Tell user about all properties if points have one of these defined
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// Default a11y options
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H.setOptions({
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accessibility: {
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enabled: true,
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pointDescriptionThreshold: 30, // set to false to disable
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keyboardNavigation: {
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enabled: true
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// skipNullPoints: false
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}
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// describeSingleSeries: false
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}
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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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// Utility function to attempt to fake a click event on an element
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function fakeClickEvent(element) {
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var fakeEvent;
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if (element && element.onclick) {
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fakeEvent = doc.createEvent('Events');
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fakeEvent.initEvent('click', true, false);
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element.onclick(fakeEvent);
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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 = this.points && this.points.length && this.points[0].graphic && this.points[0].graphic.element,
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seriesEl = firstPointEl && firstPointEl.parentNode || this.graph && this.graph.element || this.group && this.group.element; // 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 points in series
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// In that case we have to reverse them in order for 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 markers are disabled there might not be any elements there to make accessible.
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if (this.points && (this.points.length < a11yOptions.pointDescriptionThreshold || a11yOptions.pointDescriptionThreshold === false)) {
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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', a11yOptions.pointDescriptionFormatter && 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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// Make series element accessible
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if (this.chart.series.length > 1 || a11yOptions.describeSingleSeries) {
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seriesEl.setAttribute('role', 'region');
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seriesEl.setAttribute('tabindex', '-1');
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seriesEl.setAttribute('aria-label', a11yOptions.seriesDescriptionFormatter && 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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// Return string with information about series
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H.Series.prototype.buildSeriesInfoString = function() {
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var typeInfo = typeToSeriesMap[this.type] || typeToSeriesMap.default,
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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') + ' ' + (this.index + 1) + ' of ' + (this.chart.series.length) +
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(this.chart.types.length === 1 ? ' with ' : '. ' + typeInfo[0] + ' with ') +
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(this.points.length + ' ' + (this.points.length === 1 ? typeInfo[1] : typeInfo[2])) +
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(description ? '. ' + description : '') +
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(this.chart.yAxis.length > 1 && this.yAxis ? '. Y axis, ' + this.yAxis.getDescription() : '') +
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(this.chart.xAxis.length > 1 && this.xAxis ? '. X axis, ' + this.xAxis.getDescription() : '');
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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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hasSpecialKey = false,
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dateTimePoint = series.xAxis && series.xAxis.isDatetimeAxis,
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timeDesc = dateTimePoint && dateFormat(a11yOptions.pointDateFormatter && a11yOptions.pointDateFormatter(point) || a11yOptions.pointDateFormat ||
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H.Tooltip.prototype.getXDateFormat(point, series.chart.options.tooltip, series.xAxis), point.x);
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each(specialKeys, function(key) {
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if (point[key] !== undefined) {
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hasSpecialKey = true;
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}
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});
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// If the point has one of the less common properties defined, display all that are defined
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if (hasSpecialKey) {
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if (dateTimePoint) {
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infoString = timeDesc;
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}
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each(commonKeys.concat(specialKeys), function(key) {
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if (point[key] !== undefined && !(dateTimePoint && key === 'x')) {
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infoString += (infoString ? '. ' : '') + key + ', ' + this[key];
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}
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});
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} else {
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// Pick and choose properties for a succint label
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infoString = (this.name || timeDesc || this.category || this.id || 'x, ' + this.x) + ', ' +
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(this.value !== undefined ? this.value : this.y);
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}
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return (this.index + 1) + '. ' + infoString + '.' + (this.description ? ' ' + this.description : '');
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};
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// Get descriptive label for axis
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H.Axis.prototype.getDescription = function() {
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return this.userOptions && this.userOptions.description || this.axisTitle && this.axisTitle.textStr ||
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this.options.id || this.categories && 'categories' || 'values';
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};
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// Pan along axis in a direction (1 or -1), optionally with a defined granularity (number of steps it takes to walk across current view)
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H.Axis.prototype.panStep = function(direction, granularity) {
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var gran = granularity || 3,
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extremes = this.getExtremes(),
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step = (extremes.max - extremes.min) / gran * direction,
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newMax = extremes.max + step,
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newMin = extremes.min + step,
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size = newMax - newMin;
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if (direction < 0 && newMin < extremes.dataMin) {
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newMin = extremes.dataMin;
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newMax = newMin + size;
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} else if (direction > 0 && newMax > extremes.dataMax) {
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newMax = extremes.dataMax;
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newMin = newMax - size;
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}
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this.setExtremes(newMin, newMax);
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};
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// Whenever adding or removing series, keep track of types present in chart
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H.wrap(H.Series.prototype, 'init', function(proceed) {
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proceed.apply(this, Array.prototype.slice.call(arguments, 1));
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var chart = this.chart;
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if (chart.options.accessibility.enabled) {
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chart.types = chart.types || [];
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// Add type to list if does not exist
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if (chart.types.indexOf(this.type) < 0) {
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chart.types.push(this.type);
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}
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addEvent(this, 'remove', function() {
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var removedSeries = this,
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hasType = false;
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// Check if any of the other series have the same type as this one. Otherwise remove it from the list.
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each(chart.series, function(s) {
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if (s !== removedSeries && chart.types.indexOf(removedSeries.type) < 0) {
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hasType = true;
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}
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});
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if (!hasType) {
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erase(chart.types, removedSeries.type);
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}
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});
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}
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});
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// Return simplified description of chart type. Some types will not be familiar to most screen reader users, but we try.
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H.Chart.prototype.getTypeDescription = function() {
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var firstType = this.types && this.types[0],
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mapTitle = this.series[0] && this.series[0].mapTitle;
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if (!firstType) {
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return 'Empty chart.';
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} else if (firstType === 'map') {
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return mapTitle ? 'Map of ' + mapTitle : 'Map of unspecified region.';
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} else if (this.types.length > 1) {
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return 'Combination chart.';
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} else if (['spline', 'area', 'areaspline'].indexOf(firstType) > -1) {
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return 'Line chart.';
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}
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return firstType + ' chart.' + (typeDescriptionMap[firstType] || '');
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};
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// Return object with text description of each of the chart's axes
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H.Chart.prototype.getAxesDescription = function() {
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var numXAxes = this.xAxis.length,
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numYAxes = this.yAxis.length,
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desc = {},
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i;
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if (numXAxes) {
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desc.xAxis = 'The chart has ' + numXAxes + (numXAxes > 1 ? ' X axes' : ' X axis') + ' displaying ';
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if (numXAxes < 2) {
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desc.xAxis += this.xAxis[0].getDescription() + '.';
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} else {
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for (i = 0; i < numXAxes - 1; ++i) {
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desc.xAxis += (i ? ', ' : '') + this.xAxis[i].getDescription();
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}
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desc.xAxis += ' and ' + this.xAxis[i].getDescription() + '.';
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}
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}
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if (numYAxes) {
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desc.yAxis = 'The chart has ' + numYAxes + (numYAxes > 1 ? ' Y axes' : ' Y axis') + ' displaying ';
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if (numYAxes < 2) {
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desc.yAxis += this.yAxis[0].getDescription() + '.';
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} else {
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for (i = 0; i < numYAxes - 1; ++i) {
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desc.yAxis += (i ? ', ' : '') + this.yAxis[i].getDescription();
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}
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desc.yAxis += ' and ' + this.yAxis[i].getDescription() + '.';
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}
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}
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return desc;
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};
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// Set a11y attribs on exporting menu
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H.Chart.prototype.addAccessibleContextMenuAttribs = function() {
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var exportList = this.exportDivElements;
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if (exportList) {
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// Set tabindex on the menu items to allow focusing by script
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// Set role to give screen readers a chance to pick up the contents
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each(exportList, function(item) {
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if (item.tagName === 'DIV' &&
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!(item.children && item.children.length)) {
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item.setAttribute('role', 'menuitem');
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item.setAttribute('tabindex', -1);
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}
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});
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// Set accessibility properties on parent div
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exportList[0].parentNode.setAttribute('role', 'menu');
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exportList[0].parentNode.setAttribute('aria-label', 'Chart export');
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}
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};
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// Highlight a point (show tooltip and display hover state). Returns the highlighted point.
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H.Point.prototype.highlight = function() {
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var chart = this.series.chart;
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if (this.graphic && this.graphic.element.focus) {
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this.graphic.element.focus();
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}
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if (!this.isNull) {
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this.onMouseOver(); // Show the hover marker
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chart.tooltip.refresh(chart.tooltip.shared ? [this] : this); // Show the tooltip
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} else {
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chart.tooltip.hide(0);
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// Don't call blur on the element, as it messes up the chart div's focus
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}
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chart.highlightedPoint = this;
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return this;
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};
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// Function to highlight next/previous point in chart
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// Returns highlighted point on success, false on failure (no adjacent point to highlight in chosen direction)
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H.Chart.prototype.highlightAdjacentPoint = function(next) {
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var series = this.series,
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curPoint = this.highlightedPoint,
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curPointIndex = curPoint && curPoint.index || 0,
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newSeries,
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newPoint;
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// If no points, return false
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if (!series[0] || !series[0].points) {
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return false;
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}
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// Use first point if none already highlighted
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if (!curPoint) {
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return series[0].points[0].highlight();
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}
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// Find index of current point in series.points array. Necessary for dataGrouping (and maybe zoom?)
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if (curPoint.series.points[curPointIndex] !== curPoint) {
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for (var i = 0; i < curPoint.series.points.length; ++i) {
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if (curPoint.series.points[i] === curPoint) {
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curPointIndex = i;
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break;
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}
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}
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}
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// Try to grab next/prev point
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newSeries = series[curPoint.series.index + (next ? 1 : -1)];
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newPoint = curPoint.series.points[curPointIndex + (next ? 1 : -1)] || newSeries && newSeries.points[next ? 0 : newSeries.points.length - 1];
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// If there is no adjacent point, we return false
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if (newPoint === undefined) {
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return false;
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}
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// Recursively skip null points
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if (newPoint.isNull && this.options.accessibility.keyboardNavigation &&
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this.options.accessibility.keyboardNavigation.skipNullPoints) {
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this.highlightedPoint = newPoint;
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return this.highlightAdjacentPoint(next);
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}
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// There is an adjacent point, highlight it
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return newPoint.highlight();
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};
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// Show the export menu and focus the first item (if exists)
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H.Chart.prototype.showExportMenu = function() {
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if (this.exportSVGElements && this.exportSVGElements[0]) {
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this.exportSVGElements[0].element.onclick();
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this.highlightExportItem(0);
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}
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};
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// Highlight export menu item by index
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H.Chart.prototype.highlightExportItem = function(ix) {
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var listItem = this.exportDivElements && this.exportDivElements[ix],
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curHighlighted = this.exportDivElements && this.exportDivElements[this.highlightedExportItem];
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if (listItem && listItem.tagName === 'DIV' && !(listItem.children && listItem.children.length)) {
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if (listItem.focus) {
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listItem.focus();
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}
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if (curHighlighted && curHighlighted.onmouseout) {
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curHighlighted.onmouseout();
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}
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if (listItem.onmouseover) {
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listItem.onmouseover();
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}
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this.highlightedExportItem = ix;
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return true;
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}
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};
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// Highlight range selector button by index
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H.Chart.prototype.highlightRangeSelectorButton = function(ix) {
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var buttons = this.rangeSelector.buttons;
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// Deselect old
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if (buttons[this.highlightedRangeSelectorItemIx]) {
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buttons[this.highlightedRangeSelectorItemIx].setState(this.oldRangeSelectorItemState || 0);
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}
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// Select new
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this.highlightedRangeSelectorItemIx = ix;
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if (buttons[ix]) {
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if (buttons[ix].element.focus) {
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buttons[ix].element.focus();
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}
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this.oldRangeSelectorItemState = buttons[ix].state;
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buttons[ix].setState(2);
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return true;
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}
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return false;
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};
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// Highlight legend item by index
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H.Chart.prototype.highlightLegendItem = function(ix) {
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var items = this.legend.allItems;
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if (items[this.highlightedLegendItemIx]) {
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fireEvent(items[this.highlightedLegendItemIx].legendGroup.element, 'mouseout');
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}
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this.highlightedLegendItemIx = ix;
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if (items[ix]) {
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if (items[ix].legendGroup.element.focus) {
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items[ix].legendGroup.element.focus();
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}
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fireEvent(items[ix].legendGroup.element, 'mouseover');
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return true;
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}
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return false;
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};
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// Hide export menu
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H.Chart.prototype.hideExportMenu = function() {
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var exportList = this.exportDivElements;
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if (exportList) {
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each(exportList, function(el) {
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fireEvent(el, 'mouseleave');
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});
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if (exportList[this.highlightedExportItem] && exportList[this.highlightedExportItem].onmouseout) {
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exportList[this.highlightedExportItem].onmouseout();
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}
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this.highlightedExportItem = 0;
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this.renderTo.focus();
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}
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};
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// Add keyboard navigation handling to chart
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H.Chart.prototype.addKeyboardNavEvents = function() {
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var chart = this;
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// Abstraction layer for keyboard navigation. Keep a map of keyCodes to handler functions, and a next/prev move handler for tab order.
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// The module's keyCode handlers determine when to move to another module.
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// Validate holds a function to determine if there are prerequisites for this module to run that are not met.
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// Init holds a function to run once before any keyCodes are interpreted.
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// transformTabs determines whether to transform tabs to left/right events or not. Defaults to true.
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function KeyboardNavigationModule(options) {
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this.keyCodeMap = options.keyCodeMap;
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this.move = options.move;
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this.validate = options.validate;
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this.init = options.init;
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this.transformTabs = options.transformTabs !== false;
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}
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KeyboardNavigationModule.prototype = {
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// Find handler function(s) for key code in the keyCodeMap and run it.
|
run: function(e) {
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var navModule = this,
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keyCode = e.which || e.keyCode,
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handled = false;
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keyCode = this.transformTabs && keyCode === 9 ? (e.shiftKey ? 37 : 39) : keyCode; // Transform tabs
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each(this.keyCodeMap, function(codeSet) {
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if (codeSet[0].indexOf(keyCode) > -1) {
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handled = codeSet[1].call(navModule, keyCode, e) === false ? false : true; // If explicitly returning false, we haven't handled it
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}
|
});
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return handled;
|
}
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};
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// Maintain abstraction between KeyboardNavigationModule and Highcharts
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// The chart object keeps track of a list of KeyboardNavigationModules that we move through
|
function navModuleFactory(keyMap, options) {
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return new KeyboardNavigationModule(merge({
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keyCodeMap: keyMap,
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// 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) {
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chart.keyboardNavigationModuleIndex += direction;
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var newModule = chart.keyboardNavigationModules[chart.keyboardNavigationModuleIndex];
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if (newModule) {
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if (newModule.validate && !newModule.validate()) {
|
return this.move(direction); // Invalid module
|
}
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if (newModule.init) {
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newModule.init(direction); // Valid module, init it
|
return true;
|
}
|
}
|
// No module
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chart.keyboardNavigationModuleIndex = 0; // Reset counter
|
chart.slipNextTab = true; // Allow next tab to slip, as we will have focus on chart now
|
return false;
|
}
|
}, options));
|
}
|
|
// Route keydown events
|
function keydownHandler(ev) {
|
var e = ev || win.event,
|
keyCode = e.which || e.keyCode,
|
curNavModule = chart.keyboardNavigationModules[chart.keyboardNavigationModuleIndex];
|
|
// Handle tabbing
|
if (keyCode === 9) {
|
// If we reached end of chart, we need to let this tab slip through to allow users to tab further
|
if (chart.slipNextTab) {
|
chart.slipNextTab = false;
|
return;
|
}
|
}
|
// If key was not tab, don't slip the next tab
|
chart.slipNextTab = false;
|
|
// If there is a navigation module for the current index, run it. Otherwise, we are outside of the chart in some direction.
|
if (curNavModule) {
|
if (curNavModule.run(e)) {
|
e.preventDefault(); // If successfully handled, stop the event here.
|
}
|
}
|
}
|
|
// 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 = [
|
// Points
|
navModuleFactory([
|
// Left/Right
|
[
|
[37, 39],
|
function(keyCode) {
|
if (!chart.highlightAdjacentPoint(keyCode === 39)) { // Try to highlight adjacent point
|
return this.move(keyCode === 39 ? 1 : -1); // Failed. Move to next/prev module
|
}
|
}
|
],
|
// Up/Down
|
[
|
[38, 40],
|
function(keyCode) {
|
var newSeries;
|
if (chart.highlightedPoint) {
|
newSeries = chart.series[chart.highlightedPoint.series.index + (keyCode === 38 ? -1 : 1)]; // Find prev/next series
|
if (newSeries && newSeries.points[0]) { // If series exists and has data, go for it
|
newSeries.points[0].highlight();
|
} else {
|
return this.move(keyCode === 40 ? 1 : -1); // Otherwise, attempt to move to next/prev module
|
}
|
}
|
}
|
],
|
// Enter/Spacebar
|
[
|
[13, 32],
|
function() {
|
if (chart.highlightedPoint) {
|
chart.highlightedPoint.firePointEvent('click');
|
}
|
}
|
]
|
], {
|
// If coming back to points from other module, highlight last point
|
init: function(direction) {
|
var lastSeries = chart.series && chart.series[chart.series.length - 1],
|
lastPoint = lastSeries && lastSeries.points && lastSeries.points[lastSeries.points.length - 1];
|
if (direction < 0 && lastPoint) {
|
lastPoint.highlight();
|
}
|
}
|
}),
|
|
// Exporting
|
navModuleFactory([
|
// Left/Up
|
[
|
[37, 38],
|
function() {
|
var i = chart.highlightedExportItem || 0,
|
reachedEnd = true,
|
series = chart.series,
|
newSeries;
|
// 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.hideExportMenu();
|
// Wrap to last point
|
if (series && series.length) {
|
newSeries = series[series.length - 1];
|
if (newSeries.points.length) {
|
newSeries.points[newSeries.points.length - 1].highlight();
|
}
|
}
|
// Try to move to prev module (should be points, since we wrapped to last point)
|
return this.move(-1);
|
}
|
}
|
],
|
// 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.hideExportMenu();
|
return this.move(1); // Next module
|
}
|
}
|
],
|
// 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.exportDivElements) {
|
for (var i = chart.exportDivElements.length; i > -1; --i) {
|
if (chart.highlightExportItem(i)) {
|
break;
|
}
|
}
|
}
|
}
|
}),
|
|
// Map zoom
|
navModuleFactory([
|
// 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;
|
chart.mapNavButtons[chart.focusedMapNavButtonIx].setState(0); // Deselect old
|
if (e.shiftKey && !chart.focusedMapNavButtonIx || !e.shiftKey && chart.focusedMapNavButtonIx) { // trying to go somewhere we can't?
|
chart.mapZoom(); // Reset zoom
|
return this.move(e.shiftKey ? -1 : 1); // Nowhere to go, go to prev/next module
|
}
|
chart.focusedMapNavButtonIx += e.shiftKey ? -1 : 1;
|
button = chart.mapNavButtons[chart.focusedMapNavButtonIx];
|
if (button.element.focus) {
|
button.element.focus();
|
}
|
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;
|
},
|
|
// Handle tabs separately
|
transformTabs: false,
|
|
// 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');
|
});
|
|
if (initialButton.element.focus) {
|
initialButton.element.focus();
|
}
|
initialButton.setState(2);
|
chart.focusedMapNavButtonIx = direction > 0 ? 0 : 1;
|
}
|
}),
|
|
// Highstock range selector (minus input boxes)
|
navModuleFactory([
|
// 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() {
|
if (chart.oldRangeSelectorItemState !== 3) { // Don't allow click if button used to be disabled
|
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([
|
// 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(); // Input boxes are HTML, and should have focus support in all browsers
|
}
|
]
|
], {
|
// 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;
|
},
|
|
// Handle tabs different from left/right (because we don't want to catch left/right in a text area)
|
transformTabs: false,
|
|
// Highlight first/last input box
|
init: function(direction) {
|
chart.highlightedInputRangeIx = direction > 0 ? 0 : 1;
|
chart.rangeSelector[chart.highlightedInputRangeIx ? 'maxInput' : 'minInput'].focus();
|
}
|
}),
|
|
// Legend navigation
|
navModuleFactory([
|
// 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)) {
|
return this.move(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.
|
validate: function() {
|
return chart.legend && chart.legend.allItems && !chart.colorAxis;
|
},
|
|
// 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', 'Toggle visibility of series ' + item.name);
|
});
|
// Focus first/last item
|
chart.highlightLegendItem(direction > 0 ? 0 : chart.legend.allItems.length - 1);
|
}
|
})
|
];
|
|
// Init nav module index. We start at the first module, and as the user navigates through the chart the index will increase to use different handler modules.
|
chart.keyboardNavigationModuleIndex = 0;
|
|
// Make chart reachable by tab
|
if (!chart.renderTo.tabIndex) {
|
chart.renderTo.setAttribute('tabindex', '0');
|
}
|
|
// Handle keyboard events
|
addEvent(chart.renderTo, 'keydown', keydownHandler);
|
addEvent(chart, 'destroy', function() {
|
removeEvent(chart.renderTo, 'keydown', keydownHandler);
|
});
|
};
|
|
// 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(tableId) {
|
var chart = this,
|
series = chart.series,
|
options = chart.options,
|
a11yOptions = options.accessibility,
|
hiddenSection = chart.screenReaderRegion = doc.createElement('div'),
|
tableShortcut = doc.createElement('h3'),
|
tableShortcutAnchor = doc.createElement('a'),
|
chartHeading = doc.createElement('h3'),
|
hiddenStyle = { // CSS style to hide element from visual users while still exposing it to screen readers
|
position: 'absolute',
|
left: '-9999px',
|
top: 'auto',
|
width: '1px',
|
height: '1px',
|
overflow: 'hidden'
|
},
|
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;
|
|
hiddenSection.setAttribute('role', 'region');
|
hiddenSection.setAttribute('aria-label', 'Chart screen reader information.');
|
|
hiddenSection.innerHTML = a11yOptions.screenReaderSectionFormatter && a11yOptions.screenReaderSectionFormatter(chart) ||
|
'<div tabindex="0">Use regions/landmarks to skip ahead to chart' +
|
(series.length > 1 ? ' and navigate between data series' : '') + '.</div><h3>Summary.</h3><div>' + (options.title.text || 'Chart') +
|
(options.subtitle && options.subtitle.text ? '. ' + options.subtitle.text : '') +
|
'</div><h3>Long description.</h3><div>' + (options.chart.description || 'No description available.') +
|
'</div><h3>Structure.</h3><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-csv is loaded
|
if (chart.getCSV) {
|
tableShortcutAnchor.innerHTML = 'View as data table.';
|
tableShortcutAnchor.href = '#' + tableId;
|
tableShortcutAnchor.setAttribute('tabindex', '-1'); // Make this unreachable by user tabbing
|
tableShortcutAnchor.onclick = a11yOptions.onTableAnchorClick || function() {
|
chart.viewData();
|
doc.getElementById(tableId).focus();
|
};
|
tableShortcut.appendChild(tableShortcutAnchor);
|
|
hiddenSection.appendChild(tableShortcut);
|
}
|
|
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,
|
chartTitle = options.title.text || 'Chart',
|
oldColumnHeaderFormatter = options.exporting && options.exporting.csv && options.exporting.csv.columnHeaderFormatter,
|
topLevelColumns = [];
|
|
// Add SVG title/desc tags
|
titleElement.textContent = chartTitle;
|
titleElement.id = titleId;
|
descElement.parentNode.insertBefore(titleElement, descElement);
|
chart.renderTo.setAttribute('role', 'region');
|
chart.renderTo.setAttribute('aria-label', chartTitle + '. Use up and down arrows to navigate.');
|
|
// 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(tableId);
|
|
// Enable keyboard navigation
|
if (a11yOptions.keyboardNavigation) {
|
chart.addKeyboardNavEvents();
|
}
|
|
/* Wrap table functionality from export-csv */
|
|
// Keep track of columns
|
merge(true, options.exporting, {
|
csv: {
|
columnHeaderFormatter: function(series, key, keyLength) {
|
var prevCol = topLevelColumns[topLevelColumns.length - 1];
|
if (keyLength > 1) {
|
// We need multiple levels of column headers
|
// Populate a list of column headers to add in addition to the ones added by export-csv
|
if ((prevCol && prevCol.text) !== series.name) {
|
topLevelColumns.push({
|
text: series.name,
|
span: keyLength
|
});
|
}
|
}
|
if (oldColumnHeaderFormatter) {
|
return oldColumnHeaderFormatter.call(this, series, key, keyLength);
|
}
|
return keyLength > 1 ? key : series.name;
|
}
|
}
|
});
|
|
// Add ID and title/caption 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"><caption>' + chartTitle + '</caption>');
|
});
|
|
// Add accessibility attributes and top level columns
|
H.wrap(chart, 'viewData', function(proceed) {
|
if (!this.insertedTable) {
|
proceed.apply(this, Array.prototype.slice.call(arguments, 1));
|
|
var table = doc.getElementById(tableId),
|
body = table.getElementsByTagName('tbody')[0],
|
firstRow = body.firstChild.children,
|
columnHeaderRow = '<tr><td></td>',
|
cell,
|
newCell;
|
|
// Make table focusable by script
|
table.setAttribute('tabindex', '-1');
|
|
// Create row headers
|
each(body.children, function(el) {
|
cell = el.firstChild;
|
newCell = doc.createElement('th');
|
newCell.setAttribute('scope', 'row');
|
newCell.innerHTML = cell.innerHTML;
|
cell.parentNode.replaceChild(newCell, cell);
|
});
|
|
// Set scope for column headers
|
each(firstRow, function(el) {
|
if (el.tagName === 'TH') {
|
el.setAttribute('scope', 'col');
|
}
|
});
|
|
// Add top level columns
|
if (topLevelColumns.length) {
|
each(topLevelColumns, function(col) {
|
columnHeaderRow += '<th scope="col" colspan="' + col.span + '">' + col.text + '</th>';
|
});
|
body.insertAdjacentHTML('afterbegin', columnHeaderRow);
|
}
|
}
|
});
|
});
|
|
}(Highcharts));
|
}));
|
