37 lines
1 KiB
JavaScript
37 lines
1 KiB
JavaScript
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/**
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* Makes "skip to content" link work correctly in IE9, Chrome, and Opera
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* for better accessibility.
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*
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* @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
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*/
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( function() {
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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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// Repositions the window on jump-to-anchor to account for admin bar and border height.
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window.scrollBy( 0, -53 );
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}
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}, false );
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}
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} )();
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