mirror of
https://github.com/jquery/jquery-ui.git
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85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
/*!
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* jQuery UI Focusable @VERSION
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* http://jqueryui.com
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*
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* Copyright jQuery Foundation and other contributors
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* Released under the MIT license.
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* http://jquery.org/license
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*/
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//>>label: :focusable Selector
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//>>group: Core
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//>>description: Selects elements which can be focused.
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//>>docs: http://api.jqueryui.com/focusable-selector/
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( function( factory ) {
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if ( typeof define === "function" && define.amd ) {
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// AMD. Register as an anonymous module.
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define( [ "jquery", "./version" ], factory );
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} else {
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// Browser globals
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factory( jQuery );
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}
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} ( function( $ ) {
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// Selectors
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$.ui.focusable = function( element, hasTabindex ) {
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var map, mapName, img, focusableIfVisible, fieldset,
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nodeName = element.nodeName.toLowerCase();
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if ( "area" === nodeName ) {
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map = element.parentNode;
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mapName = map.name;
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if ( !element.href || !mapName || map.nodeName.toLowerCase() !== "map" ) {
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return false;
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}
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img = $( "img[usemap='#" + mapName + "']" );
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return img.length > 0 && img.is( ":visible" );
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}
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if ( /^(input|select|textarea|button|object)$/.test( nodeName ) ) {
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focusableIfVisible = !element.disabled;
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if ( focusableIfVisible ) {
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// Form controls within a disabled fieldset are disabled.
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// However, controls within the fieldset's legend do not get disabled.
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// Since controls generally aren't placed inside legends, we skip
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// this portion of the check.
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fieldset = $( element ).closest( "fieldset" )[ 0 ];
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if ( fieldset ) {
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focusableIfVisible = !fieldset.disabled;
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}
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}
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} else if ( "a" === nodeName ) {
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focusableIfVisible = element.href || hasTabindex;
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} else {
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focusableIfVisible = hasTabindex;
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}
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return focusableIfVisible && $( element ).is( ":visible" ) && visible( $( element ) );
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};
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// Support: IE 8 only
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// IE 8 doesn't resolve inherit to visible/hidden for computed values
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function visible( element ) {
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var visibility = element.css( "visibility" );
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while ( visibility === "inherit" ) {
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element = element.parent();
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visibility = element.css( "visibility" );
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}
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return visibility !== "hidden";
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}
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$.extend( $.expr[ ":" ], {
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focusable: function( element ) {
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return $.ui.focusable( element, $.attr( element, "tabindex" ) != null );
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}
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} );
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return $.ui.focusable;
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} ) );
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