( function( $ ) {
/**
* Finds the lowerst tabindex in use within a selection
- *
+ *
* @return number Lowest tabindex on the page
*/
$.fn.firstTabIndex = function() {
- var minTabIndex = 0;
+ var minTabIndex = null;
$(this).find( '[tabindex]' ).each( function() {
- var tabIndex = parseInt( $(this).attr( 'tabindex' ) );
- if ( tabIndex > minTabIndex ) {
- minTabIndex = tabIndex;
+ 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;
/**
* Finds the highest tabindex in use within a selection
- *
+ *
* @return number Highest tabindex on the page
*/
$.fn.lastTabIndex = function() {
- var maxTabIndex = 0;
+ var maxTabIndex = null;
$(this).find( '[tabindex]' ).each( function() {
- var tabIndex = parseInt( $(this).attr( 'tabindex' ) );
- if ( tabIndex > maxTabIndex ) {
- maxTabIndex = tabIndex;
+ 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;
};
-} )( jQuery );
\ No newline at end of file
+} )( jQuery );