-
- // Determine the position of an element within
- // the matched set of elements
- index: function( elem ) {
- if ( !elem || typeof elem === "string" ) {
- return jQuery.inArray( this[0],
- // If it receives a string, the selector is used
- // If it receives nothing, the siblings are used
- elem ? jQuery( elem ) : this.parent().children() );
- }
- // Locate the position of the desired element
- return jQuery.inArray(
- // If it receives a jQuery object, the first element is used
- elem.jquery ? elem[0] : elem, this );
- },
-
- is: function( selector ) {
- return !!selector && jQuery.filter( selector, this ).length > 0;
- },