MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / resources / src / jquery / jquery.tabIndex.js

diff --git a/resources/src/jquery/jquery.tabIndex.js b/resources/src/jquery/jquery.tabIndex.js
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+/**
+ * @class jQuery.plugin.tabIndex
+ */
+( function ( $ ) {
+
+       /**
+        * Find the lowest tabindex in use within a selection.
+        *
+        * @return {number} Lowest tabindex on the page
+        */
+       $.fn.firstTabIndex = function () {
+               var minTabIndex = null;
+               $( this ).find( '[tabindex]' ).each( function () {
+                       var tabIndex = parseInt( $( this ).prop( 'tabindex' ), 10 );
+                       // In IE6/IE7 the above jQuery selector returns all elements,
+                       // becuase it has a default value for tabIndex in IE6/IE7 of 0
+                       // (rather than null/undefined). Therefore check "> 0" as well.
+                       // Under IE7 under Windows NT 5.2 is also capable of returning NaN.
+                       if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
+                               // Initial value
+                               if ( minTabIndex === null ) {
+                                       minTabIndex = tabIndex;
+                               } else if ( tabIndex < minTabIndex ) {
+                                       minTabIndex = tabIndex;
+                               }
+                       }
+               } );
+               return minTabIndex;
+       };
+
+       /**
+        * Find the highest tabindex in use within a selection.
+        *
+        * @return {number} Highest tabindex on the page
+        */
+       $.fn.lastTabIndex = function () {
+               var maxTabIndex = null;
+               $( this ).find( '[tabindex]' ).each( function () {
+                       var tabIndex = parseInt( $( this ).prop( 'tabindex' ), 10 );
+                       if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
+                               // Initial value
+                               if ( maxTabIndex === null ) {
+                                       maxTabIndex = tabIndex;
+                               } else if ( tabIndex > maxTabIndex ) {
+                                       maxTabIndex = tabIndex;
+                               }
+                       }
+               } );
+               return maxTabIndex;
+       };
+
+       /**
+        * @class jQuery
+        * @mixins jQuery.plugin.tabIndex
+        */
+
+}( jQuery ) );