/** * jQuery tabIndex */ ( function( $ ) { /** * Finds the lowerst 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).attr( '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; }; /** * Finds 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).attr( 'tabindex' ), 10 ); if ( tabIndex > 0 && !isNaN( tabIndex ) ) { // Initial value if ( maxTabIndex === null ) { maxTabIndex = tabIndex; } else if ( tabIndex > maxTabIndex ) { maxTabIndex = tabIndex; } } } ); return maxTabIndex; }; } )( jQuery );