Backbone.JS listenTo() Event

The Backbone.JS event listenTo() method is used to inform one object to listen to another object’s event. When an event occurs, it provides a callback function. It also keep a track for the events. The attribute of the events in Backbone.JS to get mixed to any object is an advantage.

Syntax:

object.listenTo(other, event, callback)   

Parameters:
other: This parameter is used to specify the name of the other object.
event: This parameter is used to specify the event whose binding with an object is needed.
callback: This parameter is used to specify the callback function that will be executed when an event is fired.

Example:

  

  
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Output:

The triggered message for you is: How are you? This is an example for Event listenTo() method.

Explanation:
The Event listenTo() method will inform one object to listen to another object’s event. When an event occurs, it provides a callback function. Here, the object Y listens for the ‘func’ event triggered on the object X. The X has no ‘func’ event and thus displays the value of Y.