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                 // In IE6/IE7 the above jQuery selector returns all elements,
  15                 // becuase it has a default value for tabIndex in IE6/IE7 of 0
  16                 // (rather than null/undefined). Therefore check "> 0" as well
  17                 if ( tabIndex > 0 ) {
  18                         if ( i === 0 ) {
  19                                 minTabIndex = tabIndex;
  20                         } else if ( tabIndex < minTabIndex ) {
  21                                 minTabIndex = tabIndex;
  22                         }
  23                 }
  24         } );
  25         return minTabIndex;
  26 };
  27
  28 /**
  29  * Finds the highest tabindex in use within a selection
  30  *
  31  * @return number Highest tabindex on the page
  32  */
  33 $.fn.lastTabIndex = function() {
  34         var maxTabIndex = null;
  35         $(this).find( '[tabindex]' ).each( function( i ) {
  36                 var tabIndex = parseInt( $(this).attr( 'tabindex' ), 10 );
  37                 if ( i === 0 ) {
  38                         maxTabIndex = tabIndex;
  39                 } else if ( tabIndex > maxTabIndex ) {
  40                         maxTabIndex = tabIndex;
  41                 }
  42         } );
  43         return maxTabIndex;
  44 };
  45 } )( jQuery );