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window.wp = window.wp || {};
( function ( wp, $ ) {
'use strict';
var $containerPolite,
$containerAssertive,
previousMessage = '';
/**
* Update the ARIA live notification area text node.
*
* @since 4.2.0
* @since 4.3.0 Introduced the 'ariaLive' argument.
*
* @param {String} message The message to be announced by Assistive Technologies.
* @param {String} ariaLive Optional. The politeness level for aria-live. Possible values:
* polite or assertive. Default polite.
*/
function speak( message, ariaLive ) {
// Clear previous messages to allow repeated strings being read out.
clear();
// Ensure only text is sent to screen readers.
message = $( '<p>' ).html( message ).text();
/*
* Safari 10+VoiceOver don't announce repeated, identical strings. We use
* a `no-break space` to force them to think identical strings are different.
* See ticket #36853.
*/
if ( previousMessage === message ) {
message = message + '\u00A0';
}
previousMessage = message;
if ( $containerAssertive && 'assertive' === ariaLive ) {
$containerAssertive.text( message );
} else if ( $containerPolite ) {
$containerPolite.text( message );
}
}
/**
* Build the live regions markup.
*
* @since 4.3.0
*
* @param {String} ariaLive Optional. Value for the 'aria-live' attribute, default 'polite'.
*
* @return {Object} $container The ARIA live region jQuery object.
*/
function addContainer( ariaLive ) {
ariaLive = ariaLive || 'polite';
var $container = $( '<div>', {
'id': 'wp-a11y-speak-' + ariaLive,
'aria-live': ariaLive,
'aria-relevant': 'additions text',
'aria-atomic': 'true',
'class': 'screen-reader-text wp-a11y-speak-region'
});
$( document.body ).append( $container );
return $container;
}
/**
* Clear the live regions.
*
* @since 4.3.0
*/
function clear() {
$( '.wp-a11y-speak-region' ).text( '' );
}
/**
* Initialize wp.a11y and define ARIA live notification area.
*
* @since 4.2.0
* @since 4.3.0 Added the assertive live region.
*/
$( document ).ready( function() {
$containerPolite = $( '#wp-a11y-speak-polite' );
$containerAssertive = $( '#wp-a11y-speak-assertive' );
if ( ! $containerPolite.length ) {
$containerPolite = addContainer( 'polite' );
}
if ( ! $containerAssertive.length ) {
$containerAssertive = addContainer( 'assertive' );
}
});
wp.a11y = wp.a11y || {};
wp.a11y.speak = speak;
}( window.wp, window.jQuery ));