callbacks.has()
callbacks.has( callback ) Returns: Boolean
Description: Determine whether a supplied callback is in a list
-
version added: 1.7callbacks.has( callback )
callbackThe callback to search for.
Example
Using callbacks.has() to check if a callback list contains a specific callback:
// a sample logging function to be added to a callbacks list
var foo = function( value1, value2 ){
console.log( 'Received:' + value1 + ',' + value2 );
}
// a second function which will not be added to the list
var bar = function( value1, value2 ){
console.log( 'foobar');
}
var callbacks = $.Callbacks();
// add the log method to the callbacks list
callbacks.add( foo );
// determine which callbacks are in the list
console.log( callbacks.has( foo ) ); // true
console.log( callbacks.has( bar ) ); // false