resources/jquery/jquery.tabIndex.js

   1 /**
   2  * jQuery tabIndex
   3  */
   4 ( function( $ ) {
   5 /**
   6  * Finds the lowerst tabindex in use within a selection
   7  *
   8  * @return number Lowest tabindex on the page
   9  */
  10 $.fn.firstTabIndex = function() {
  11         var minTabIndex = null;
  12         $(this).find( '[tabindex]' ).each( function( i ) {
  13                 var tabIndex = parseInt( $(this).attr( 'tabindex' ), 10 );
  14                 if ( i === 0 ) {
  15                         minTabIndex = tabIndex;
  16                 // In IE6/IE7 the above jQuery selector returns all elements,
  17                 // becuase it has a default value for tabIndex in IE6/IE7 of 0
  18                 // (rather than null/undefined). Therefore check "> 0" as well
  19                 } else if ( tabIndex > 0 && tabIndex < minTabIndex ) {
  20                         minTabIndex = tabIndex;
  21                 }
  22         } );
  23         return minTabIndex;
  24 };
  25
  26 /**
  27  * Finds the highest tabindex in use within a selection
  28  *
  29  * @return number Highest tabindex on the page
  30  */
  31 $.fn.lastTabIndex = function() {
  32         var maxTabIndex = null;
  33         $(this).find( '[tabindex]' ).each( function( i ) {
  34                 var tabIndex = parseInt( $(this).attr( 'tabindex' ), 10 );
  35                 if ( i === 0 ) {
  36                         maxTabIndex = tabIndex;
  37                 } else if ( tabIndex > maxTabIndex ) {
  38                         maxTabIndex = tabIndex;
  39                 }
  40         } );
  41         return maxTabIndex;
  42 };
  43 } )( jQuery );