jQuery callbacks.add() Method

Last Updated:

jQuery callbacks.add() Method

The jQuery callbacks.add() method adds a callback or a collection of callbacks to a callback list.

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

In the following example, we add the functions foo and bar to the callbacks list and then fire it with a parameter value.

Example

HTML Editor
<!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.add() 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.add(bar); callbacks.fire("hello"); function foo(value){ console.log("foo : " +value); } function bar(value){ console.log("bar : " +value); } }); }); </script> </body> </html>

Syntax

callbacks.add(func);

Parameter Values

Value Type Explanation
func Required Specifies a function, or array of functions, that are to be added to the callbacks list.

Browser Support

Devicedesktopmobile
Browsergoogle chromesafarifirefoxinternet Exploreredgeoperagoogle chromesafarifirefoxedgeoperaandroid webviewsamsung internet
callbacks.add()YesYesYesYesYesYesYesYesYesYesYesYesYes

Deep Understanding

The following example will fire foo function for 2 times and bar function for just 1 time.

Example

HTML Editor
<!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.add() 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 foo"); callbacks.add(bar); callbacks.fire("hello bar"); function foo(value){ console.log("foo : " +value); } function bar(value){ console.log("bar : " +value); } }); }); </script> </body> </html>

Share this Page

Meet the Author