jQuery callbacks.has() Method

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jQuery callbacks.has() Method

The jQuery callbacks.has() method returns whether the callbacks has the specified function.

Note: $.Callbacks() is a multi-purpose callbacks list object that provides a powerful way to manage callback lists.


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<!DOCTYPE html> <html lang="en-US"> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> </head> <body> <h1>jQuery callbacks.has() Method</h1> <p>Click on the button and check your console.</p> <button>Click Me</button> <script> $(document).ready(function(){ $("button").click(function(){ var callbacks = $.Callbacks(); callbacks.add(foo); callbacks.fire("hello"); console.log("foo called : " +callbacks.has(foo)); console.log("bar called : " +callbacks.has(bar)); function foo(value){ console.log("foo : " +value); } function bar(value){ console.log("bar : " +value); } }); }); </script> </body> </html>



Parameter Values

funcRequiredSpecifies the callbacks to search for.

Return Value

trueIf the callbacks has the specified function.
falseIf the callbacks does not has the specified function.


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