https://www.springerpub.com/static/version1789146322/base/Magento/base/default/jquery/ui-modules/focusable.js

1/*!
2 * jQuery UI Focusable 1.13.2
3 * http://jqueryui.com
4 *
5 * Copyright jQuery Foundation and other contributors
6 * Released under the MIT license.
7 * http://jquery.org/license
8 */
9
10//>>label: :focusable Selector
11//>>group: Core
12//>>description: Selects elements which can be focused.
13//>>docs: http://api.jqueryui.com/focusable-selector/
14
15( function( factory ) {
16    "use strict";
17
18    if ( typeof define === "function" && define.amd ) {
19
20        // AMD. Register as an anonymous module.
21        define( [ "jquery", "./version" ], factory );
22    } else {
23
24        // Browser globals
25        factory( jQuery );
26    }
27} )( function( $ ) {
28    "use strict";
29
30// Selectors
31    $.ui.focusable = function( element, hasTabindex ) {
32        var map, mapName, img, focusableIfVisible, fieldset,
33            nodeName = element.nodeName.toLowerCase();
34
35        if ( "area" === nodeName ) {
36            map = element.parentNode;
37            mapName = map.name;
38            if ( !element.href || !mapName || map.nodeName.toLowerCase() !== "map" ) {
39                return false;
40            }
41            img = $( "img[usemap='#" + mapName + "']" );
42            return img.length > 0 && img.is( ":visible" );
43        }
44
45        if ( /^(input|select|textarea|button|object)$/.test( nodeName ) ) {
46            focusableIfVisible = !element.disabled;
47
48            if ( focusableIfVisible ) {
49
50                // Form controls within a disabled fieldset are disabled.
51                // However, controls within the fieldset's legend do not get disabled.
52                // Since controls generally aren't placed inside legends, we skip
53                // this portion of the check.
54                fieldset = $( element ).closest( "fieldset" )[ 0 ];
55                if ( fieldset ) {
56                    focusableIfVisible = !fieldset.disabled;
57                }
58            }
59        } else if ( "a" === nodeName ) {
60            focusableIfVisible = element.href || hasTabindex;
61        } else {
62            focusableIfVisible = hasTabindex;
63        }
64
65        return focusableIfVisible && $( element ).is( ":visible" ) && visible( $( element ) );
66    };
67
68// Support: IE 8 only
69// IE 8 doesn't resolve inherit to visible/hidden for computed values
70    function visible( element ) {
71        var visibility = element.css( "visibility" );
72        while ( visibility === "inherit" ) {
73            element = element.parent();
74            visibility = element.css( "visibility" );
75        }
76        return visibility === "visible";
77    }
78
79    $.extend( $.expr.pseudos, {
80        focusable: function( element ) {
81            return $.ui.focusable( element, $.attr( element, "tabindex" ) != null );
82        }
83    } );
84
85    return $.ui.focusable;
86
87} );