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