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   1  /**
   2   * @class jQuery.plugin.tabIndex
   3   */
   4  ( function ( $ ) {
   5  
   6      /**
   7       * Find the lowest tabindex in use within a selection.
   8       *
   9       * @return {number} Lowest tabindex on the page
  10       */
  11      $.fn.firstTabIndex = function () {
  12          var minTabIndex = null;
  13          $(this).find( '[tabindex]' ).each( function () {
  14              var tabIndex = parseInt( $(this).prop( 'tabindex' ), 10 );
  15              // In IE6/IE7 the above jQuery selector returns all elements,
  16              // becuase it has a default value for tabIndex in IE6/IE7 of 0
  17              // (rather than null/undefined). Therefore check "> 0" as well.
  18              // Under IE7 under Windows NT 5.2 is also capable of returning NaN.
  19              if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
  20                  // Initial value
  21                  if ( minTabIndex === null ) {
  22                      minTabIndex = tabIndex;
  23                  } else if ( tabIndex < minTabIndex ) {
  24                      minTabIndex = tabIndex;
  25                  }
  26              }
  27          } );
  28          return minTabIndex;
  29      };
  30  
  31      /**
  32       * Find the highest tabindex in use within a selection.
  33       *
  34       * @return {number} Highest tabindex on the page
  35       */
  36      $.fn.lastTabIndex = function () {
  37          var maxTabIndex = null;
  38          $(this).find( '[tabindex]' ).each( function () {
  39              var tabIndex = parseInt( $(this).prop( 'tabindex' ), 10 );
  40              if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
  41                  // Initial value
  42                  if ( maxTabIndex === null ) {
  43                      maxTabIndex = tabIndex;
  44                  } else if ( tabIndex > maxTabIndex ) {
  45                      maxTabIndex = tabIndex;
  46                  }
  47              }
  48          } );
  49          return maxTabIndex;
  50      };
  51  
  52      /**
  53       * @class jQuery
  54       * @mixins jQuery.plugin.tabIndex
  55       */
  56  
  57  }( jQuery ) );