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/**
* @class jQuery.plugin.tabIndex
*/
( function ( $ ) {
/**
* Find the lowest 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).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;
};
/**
* Find 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).prop( 'tabindex' ), 10 );
if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
// Initial value
if ( maxTabIndex === null ) {
maxTabIndex = tabIndex;
} else if ( tabIndex > maxTabIndex ) {
maxTabIndex = tabIndex;
}
}
} );
return maxTabIndex;
};
/**
* @class jQuery
* @mixins jQuery.plugin.tabIndex
*/
}( jQuery ) );
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