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BackboneJS - Event Off
Description
This event removes the callback functions or all events from an object.
Syntax
object.off(event, callback function, [context])
Parameters
event − It binds an object.
callback − It is the reference to the code.
context − It is an object that can be passed to a callback function.
Example
<!DOCTYPE html> <html> <head> <title>Event Off Example</title> <script src = "https://code.jquery.com/jquery-2.1.3.min.js" type = "text/javascript"></script> <script src = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type = "text/javascript"></script> <script src = "https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type = "text/javascript"></script> </head> <body> <script type = "text/javascript"> //Here creating an object 'myVal' and extending with Backbone.Events method var myVal = _.extend({name:'hello'}, Backbone.Events); var myFunc = function () { document.write('Hello'); }; var myFunc1 = function () { document.write('Welcome to TutorialsPoint'); }; // The on() method will bind the callback function to objects // 'myFunc' and 'myFunc1' myVal.on('log',myFunc); myVal.on('log',myFunc1); document.write('Before using off event, values will be: '); // trigger() method callbacks for the given event and display the text // defined in the 'myFunc' and 'myFunc1' functions myVal.trigger('log'); //The off() method removes the callback for 'myFunc' and logs only // text of 'myFunc1' myVal.off('log',myFunc); document.write("<br>"); document.write('After using off event, values will be: '); myVal.trigger('log'); </script> </body> </html>
Output
Let us carry out the following steps to see how above code works −
Save the above code in off.htm file
Open this HTML file in a browser.
backbonejs_events.htm
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