wikimedia/mediawiki-extensions-VisualEditor

/**
 * Mixin for adding descriptive ARIA support to elements.
 *
 * @class
 * @abstract
 *
 * @constructor
 * @param {Object} [config] Configuration options
 * @param {jQuery} [config.$ariaDescribedBy]
 * @param {string} [config.ariaLabel]
 * @param {jQuery} [config.$describedElement]
 */
ve.ui.MWAriaDescribe = function VeUiMWAriaDescribe( config ) {
    this.$describedElement = config.$describedElement || this.$element;

    if ( config.$ariaDescribedBy ) {
        this.setAriaDescribedBy( config.$ariaDescribedBy );
    }

    if ( config.ariaLabel ) {
        this.setAriaLabel( config.ariaLabel );
    }
};

/* Setup */

OO.initClass( ve.ui.MWAriaDescribe );

/**
 * @param {jQuery} [$description]
 * @chainable
 * @return {OO.ui.Element} The element, for chaining
 */
ve.ui.MWAriaDescribe.prototype.setAriaDescribedBy = function ( $description ) {
    if ( !$description ) {
        this.$describedElement.removeAttr( 'aria-describedby' );
        return this;
    }

    if ( !$description.attr( 'id' ) ) {
        $description.attr( 'id', OO.ui.generateElementId() );
    }
    this.$describedElement.attr( 'aria-describedby', $description.attr( 'id' ) );
    return this;
};

/**
 * @param {string} label
 * @chainable
 * @return {OO.ui.Element} The element, for chaining
 */
ve.ui.MWAriaDescribe.prototype.setAriaLabel = function ( label ) {
    this.$describedElement.attr( 'aria-label', label );
    return this;
};