callbacks.has()
Categories: Callbacks Object
callbacks.has( callback )Returns: Boolean
Description: Determine whether a supplied callback is in a list
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callbacks.has( callback )
version added: 1.1callback The 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