Example of callbacks.has() in jQuery
March 30, 2013
has() in jQuery is called on callback list. has() checks whether given callback function is available in callback list or not. In code it is used as
callbacks.has( function_name )
<html>
<body>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
var cal = function(a,b) {
console.log(a+b);
};
var show = function( val ) {
console.log(val);
};
var callbacks = $.Callbacks();
callbacks.add( cal );
console.log(callbacks.has( cal ));
console.log(callbacks.has( show ));
</script>
</body>
</html>
Output
true false
