631 lines
18 KiB
JavaScript
631 lines
18 KiB
JavaScript
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/* *
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*
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* (c) 2009-2019 Øystein Moseng
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*
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* Default options for accessibility.
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*
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* License: www.highcharts.com/license
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*
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* */
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'use strict';
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/**
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* @callback Highcharts.ScreenReaderClickCallbackFunction
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*
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* @param {global.MouseEvent} evt
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* Mouse click event
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*
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* @return {void}
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*/
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/**
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* Creates a formatted string for the screen reader module.
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*
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* @callback Highcharts.ScreenReaderFormatterCallbackFunction<T>
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*
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* @param {T} context
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* Context to format
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*
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* @return {string}
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* Formatted string for the screen reader module.
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*/
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var options = {
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/**
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* Options for configuring accessibility for the chart. Requires the
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* [accessibility module](https://code.highcharts.com/modules/accessibility.js)
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* to be loaded. For a description of the module and information
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* on its features, see
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* [Highcharts Accessibility](http://www.highcharts.com/docs/chart-concepts/accessibility).
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*
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* @requires module:modules/accessibility
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*
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* @since 5.0.0
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* @optionparent accessibility
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*/
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accessibility: {
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/**
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* Enable accessibility functionality for the chart.
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*
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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 {boolean|number}
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* @since 5.0.0
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*/
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pointDescriptionThreshold: 500, // set to false to disable
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/**
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* Whether or not to add a shortcut button in the screen reader
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* information region to show the data table.
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* @since 7.1.0
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*/
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addTableShortcut: true,
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/**
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* Date format to use to describe range of datetime axes.
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*
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* For an overview of the replacement codes, see
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* [dateFormat](/class-reference/Highcharts#dateFormat).
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*
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* @see [pointDateFormat](#accessibility.pointDateFormat)
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* @since 7.1.0
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*/
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axisRangeDateFormat: '%Y-%m-%d %H:%M:%S',
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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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* @since 5.0.0
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*/
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describeSingleSeries: false,
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/**
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* Amount of landmarks/regions to create for screen reader users. More
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* landmarks can make navigation with screen readers easier, but can
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* be distracting if there are lots of charts on the page. Three modes
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* are available:
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* - `all`: Adds regions for all series, legend, menu, information
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* region.
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* - `one`: Adds a single landmark per chart.
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* - `disabled`: No landmarks are added.
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*
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* @since 7.1.0
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* @validvalue ["all", "one", "disabled"]
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*/
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landmarkVerbosity: 'all',
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/**
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* A hook for adding custom components to the accessibility module.
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* Should be an object mapping component names to instances of classes
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* inheriting from the Highcharts.AccessibilityComponent base class.
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* Remember to add the component to the
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* [keyboardNavigation.order](#accessibility.keyboardNavigation.order)
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* for the keyboard navigation to be usable.
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*
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* @since 7.1.0
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* @type {object}
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* @sample highcharts/accessibility/custom-component
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* Custom accessibility component
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* @apioption accessibility.customComponents
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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 in the hidden screen reader
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* information region.
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*
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* Note: It is considered a best practice to make the description of the
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* chart visible to all users, so consider if this can be placed in text
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* around the chart instead.
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*
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* @see [typeDescription](#accessibility.typeDescription)
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*
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* @type {string}
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* @since 5.0.0
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* @apioption accessibility.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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* 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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* @since 5.0.0
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* @apioption accessibility.typeDescription
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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 {Highcharts.ScreenReaderClickCallbackFunction}
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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](/class-reference/Highcharts#dateFormat).
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*
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* @see [pointDateFormatter](#accessibility.pointDateFormatter)
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*
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* @type {string}
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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](/class-reference/Highcharts#dateFormat).
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*
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* @see [pointDateFormat](#accessibility.pointDateFormat)
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*
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* @type {Highcharts.ScreenReaderFormatterCallbackFunction<Highcharts.Point>}
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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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* Prefix to add to the values in the point descriptions. Uses
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* [tooltip.valuePrefix](#tooltip.valuePrefix) if not defined.
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*
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* @type {string}
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* @since 7.1.0
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* @apioption accessibility.pointValuePrefix
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*/
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/**
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* Suffix to add to the values in the point descriptions. Uses
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* [tooltip.valueSuffix](#tooltip.valueSuffix) if not defined.
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*
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* @type {string}
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* @since 7.1.0
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* @apioption accessibility.pointValueSuffix
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*/
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/**
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* Decimals to use for the values in the point descriptions. Uses
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* [tooltip.valueDecimals](#tooltip.valueDecimals) if not defined.
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*
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* @type {string}
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* @since 7.1.0
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* @apioption accessibility.pointValueDecimals
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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. If `false` is returned, the default formatter will be
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* used for that point.
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*
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* @see [point.description](#series.line.data.description)
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*
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* @type {Highcharts.ScreenReaderFormatterCallbackFunction<Highcharts.Point>}
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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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* 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. If `false` is returned, the
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* default formatter will be used for that series.
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*
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* @see [series.description](#plotOptions.series.description)
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*
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* @type {Highcharts.ScreenReaderFormatterCallbackFunction<Highcharts.Series>}
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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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* 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. By default this returns an automatic description of
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* the chart.
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*
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* The button to view the chart as a data table will be added
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* automatically after the custom HTML content if enabled.
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*
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* @type {Highcharts.ScreenReaderFormatterCallbackFunction<Highcharts.Chart>}
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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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* Options for keyboard navigation.
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*
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* @since 5.0.0
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*/
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keyboardNavigation: {
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/**
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* Enable keyboard navigation for the chart.
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*
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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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* Set the keyboard navigation mode for the chart. Can be "normal"
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* or "serialize". In normal mode, left/right arrow keys move
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* between points in a series, while up/down arrow keys move between
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* series. Up/down navigation acts intelligently to figure out which
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* series makes sense to move to from any given point.
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*
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* In "serialize" mode, points are instead navigated as a single
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* list. Left/right behaves as in "normal" mode. Up/down arrow keys
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* will behave like left/right. This can be useful for unifying
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* navigation behavior with/without screen readers enabled.
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*
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* @type {string}
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* @default normal
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* @since 6.0.4
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* @validvalue ["normal", "serialize"]
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* @apioption accessibility.keyboardNavigation.mode
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*/
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/**
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* Skip null points when navigating through points with the
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* keyboard.
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*
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* @since 5.0.0
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*/
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skipNullPoints: true,
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/**
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* Options for the focus border drawn around elements while
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* navigating through them.
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*
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* @sample highcharts/accessibility/custom-focus
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* Custom focus ring
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*
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* @since 6.0.3
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*/
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focusBorder: {
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/**
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* Enable/disable focus border for chart.
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*
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* @since 6.0.3
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*/
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enabled: true,
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/**
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* Hide the browser's default focus indicator.
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*
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* @since 6.0.4
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*/
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hideBrowserFocusOutline: true,
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/**
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* Style options for the focus border drawn around elements
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* while navigating through them. Note that some browsers in
|
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* addition draw their own borders for focused elements. These
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* automatic borders can not be styled by Highcharts.
|
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*
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* In styled mode, the border is given the
|
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* `.highcharts-focus-border` class.
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*
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||
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* @type {Highcharts.CSSObject}
|
||
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* @default {"color": "#335cad", "lineWidth": 2, "borderRadius": 3}
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* @since 6.0.3
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||
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*/
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style: {
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/** @ignore-option */
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color: '#335cad',
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/** @ignore-option */
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lineWidth: 2,
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/** @ignore-option */
|
||
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borderRadius: 3
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},
|
||
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|
||
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/**
|
||
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* Focus border margin around the elements.
|
||
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*
|
||
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* @since 6.0.3
|
||
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*/
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||
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margin: 2
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},
|
||
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|
||
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/**
|
||
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* Order of tab navigation in the chart. Determines which elements
|
||
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* are tabbed to first. Available elements are: `series`, `zoom`,
|
||
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* `rangeSelector`, `chartMenu`, `legend`. In addition, any custom
|
||
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* components can be added here.
|
||
|
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*
|
||
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* @since 7.1.0
|
||
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*/
|
||
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order: ['series', 'zoom', 'rangeSelector', 'chartMenu', 'legend'],
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|
||
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/**
|
||
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* Whether or not to wrap around when reaching the end of arrow-key
|
||
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* navigation for an element in the chart.
|
||
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* @since 7.1.0
|
||
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*/
|
||
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wrapAround: true
|
||
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},
|
||
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|
|
||
|
|
/**
|
||
|
|
* Options for announcing new data to screen reader users. Useful
|
||
|
|
* for dynamic data applications and drilldown.
|
||
|
|
*
|
||
|
|
* Keep in mind that frequent announcements will not be useful to
|
||
|
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* users, as they won't have time to explore the new data. For these
|
||
|
|
* applications, consider making snapshots of the data accessible, and
|
||
|
|
* do the announcements in batches.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
*/
|
||
|
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announceNewData: {
|
||
|
|
/**
|
||
|
|
* Optional formatter callback for the announcement. Receives
|
||
|
|
* up to three arguments. The first argument is always an array
|
||
|
|
* of all series that received updates. If an announcement is
|
||
|
|
* already queued, the series that received updates for that
|
||
|
|
* announcement are also included in this array. The second
|
||
|
|
* argument is provided if `chart.addSeries` was called, and
|
||
|
|
* there is a new series. In that case, this argument is a
|
||
|
|
* reference to the new series. The third argument, similarly,
|
||
|
|
* is provided if `series.addPoint` was called, and there is a
|
||
|
|
* new point. In that case, this argument is a reference to the
|
||
|
|
* new point.
|
||
|
|
*
|
||
|
|
* The function should return a string with the text to announce
|
||
|
|
* to the user. Return empty string to not announce anything.
|
||
|
|
* Return `false` to use the default announcement format.
|
||
|
|
*
|
||
|
|
* @type {Function}
|
||
|
|
* @default undefined
|
||
|
|
* @sample highcharts/accessibility/custom-dynamic
|
||
|
|
* High priority live $.messager.alerts
|
||
|
|
* @apioption accessibility.announceNewData.announcementFormatter
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Enable announcing new data to screen reader users
|
||
|
|
* @sample highcharts/accessibility/accessible-dynamic
|
||
|
|
* Dynamic data accessible
|
||
|
|
*/
|
||
|
|
enabled: false,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Minimum interval between announcements in milliseconds. If
|
||
|
|
* new data arrives before this amount of time has passed, it is
|
||
|
|
* queued for announcement. If another new data event happens
|
||
|
|
* while an announcement is queued, the queued announcement is
|
||
|
|
* dropped, and the latest announcement is queued instead. Set
|
||
|
|
* to 0 to allow all announcements, but be warned that frequent
|
||
|
|
* announcements are disturbing to users.
|
||
|
|
*/
|
||
|
|
minAnnounceInterval: 5000,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Choose whether or not the announcements should interrupt the
|
||
|
|
* screen reader. If not enabled, the user will be notified once
|
||
|
|
* idle. It is recommended not to enable this setting unless
|
||
|
|
* there is a specific reason to do so.
|
||
|
|
*/
|
||
|
|
interruptUser: false
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Provide a description of the data point, announced to screen readers.
|
||
|
|
*
|
||
|
|
* @type {string}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @default undefined
|
||
|
|
* @apioption series.line.data.accessibility.description
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Accessibility options for a series. Requires the accessibility module.
|
||
|
|
*
|
||
|
|
* @requires module:modules/accessibility
|
||
|
|
*
|
||
|
|
* @type {object}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @apioption plotOptions.series.accessibility
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Enable/disable accessibility functionality for a specific series.
|
||
|
|
*
|
||
|
|
* @type {boolean}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @default undefined
|
||
|
|
* @apioption plotOptions.series.accessibility.enabled
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Provide a description of the series, announced to screen readers.
|
||
|
|
*
|
||
|
|
* @type {string}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @default undefined
|
||
|
|
* @apioption plotOptions.series.accessibility.description
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Formatter function to use instead of the default for point
|
||
|
|
* descriptions. Same as `accessibility.pointDescriptionFormatter`, but for
|
||
|
|
* a single series.
|
||
|
|
*
|
||
|
|
* @see [accessibility.pointDescriptionFormatter](#accessibility.pointDescriptionFormatter)
|
||
|
|
*
|
||
|
|
* @type {Function}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @default undefined
|
||
|
|
* @apioption plotOptions.series.accessibility.pointDescriptionFormatter
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Expose only the series element to screen readers, not its points.
|
||
|
|
*
|
||
|
|
* @type {boolean}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @default undefined
|
||
|
|
* @apioption plotOptions.series.accessibility.exposeAsGroupOnly
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Keyboard navigation for a series
|
||
|
|
*
|
||
|
|
* @type {object}
|
||
|
|
* @since 7.1.0
|
||
|
|
* @apioption plotOptions.series.accessibility.keyboardNavigation
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Enable/disable keyboard navigation support for a specific series.
|
||
|
|
*
|
||
|
|
* @type {boolean}
|
||
|
|
* @default undefined
|
||
|
|
* @since 7.1.0
|
||
|
|
* @apioption plotOptions.series.accessibility.keyboardNavigation.enabled
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Accessibility options for an axis. Requires the accessibility module.
|
||
|
|
*
|
||
|
|
* @requires module:modules/accessibility
|
||
|
|
* @since 7.1.0
|
||
|
|
* @type {object}
|
||
|
|
* @apioption xAxis.accessibility
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Enable axis accessibility features, including axis information in the
|
||
|
|
* screen reader information region. If this is disabled on the xAxis, the
|
||
|
|
* x values are not exposed to screen readers for the individual data points
|
||
|
|
* by default.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @type {boolean}
|
||
|
|
* @default undefined
|
||
|
|
* @apioption xAxis.accessibility.enabled
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Description for an axis to expose to screen reader users.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @type {string}
|
||
|
|
* @default undefined
|
||
|
|
* @apioption xAxis.accessibility.description
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Range description for an axis. Overrides the default range description.
|
||
|
|
* Set to empty to disable range description for this axis.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @type {string}
|
||
|
|
* @default undefined
|
||
|
|
* @apioption xAxis.accessibility.rangeDescription
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
legend: {
|
||
|
|
/**
|
||
|
|
* Accessibility options for the legend. Requires the Accessibility
|
||
|
|
* module.
|
||
|
|
*
|
||
|
|
* @requires module:modules/accessibility
|
||
|
|
* @since 7.1.0
|
||
|
|
* @type {object}
|
||
|
|
* @apioption legend.accessibility
|
||
|
|
*/
|
||
|
|
accessibility: {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Enable accessibility support for the legend.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @apioption legend.accessibility.enabled
|
||
|
|
*/
|
||
|
|
enabled: true,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Options for keyboard navigation for the legend.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @apioption legend.accessibility.keyboardNavigation
|
||
|
|
*/
|
||
|
|
keyboardNavigation: {
|
||
|
|
/**
|
||
|
|
* Enable keyboard navigation for the legend.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @see [accessibility.keyboardNavigation](
|
||
|
|
* #accessibility.keyboardNavigation.enabled)
|
||
|
|
* @apioption legend.accessibility.keyboardNavigation.enabled
|
||
|
|
*/
|
||
|
|
enabled: true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
exporting: {
|
||
|
|
/**
|
||
|
|
* Accessibility options for the exporting menu. Requires the
|
||
|
|
* Accessibility module.
|
||
|
|
*
|
||
|
|
* @requires module:modules/accessibility
|
||
|
|
* @since 7.1.0
|
||
|
|
* @type {object}
|
||
|
|
* @apioption exporting.accessibility
|
||
|
|
*/
|
||
|
|
accessibility: {
|
||
|
|
/**
|
||
|
|
* Enable accessibility support for the export menu.
|
||
|
|
*
|
||
|
|
* @since 7.1.0
|
||
|
|
* @apioption exporting.accessibility.enabled
|
||
|
|
*/
|
||
|
|
enabled: true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
export default options;
|