35 lines
895 B
JavaScript
35 lines
895 B
JavaScript
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/**
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* File skip-link-focus-fix.js.
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*
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* Helps with accessibility for keyboard only users.
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*
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* Learn more: https://git.io/vWdr2
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*/
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( function() {
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'use strict';
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var isWebkit = navigator.userAgent.toLowerCase().indexOf( 'webkit' ) > -1,
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isOpera = navigator.userAgent.toLowerCase().indexOf( 'opera' ) > -1,
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isIe = navigator.userAgent.toLowerCase().indexOf( 'msie' ) > -1;
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if ( ( isWebkit || isOpera || isIe ) && document.getElementById && window.addEventListener ) {
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window.addEventListener( 'hashchange', function() {
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var id = location.hash.substring( 1 ),
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element;
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if ( ! ( /^[A-z0-9_-]+$/.test( id ) ) ) {
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return;
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}
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element = document.getElementById( id );
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if ( element ) {
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if ( ! ( /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) ) {
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element.tabIndex = -1;
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}
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element.focus();
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}
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}, false );
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}
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})();
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