Backbone.js Event listenTo()

The Backbone.js Event listenTo method tells an object to listen to a particular event on another object. It provides callback function when an event occurs and also keeps track of events.

Syntax:

Parameter explanation:

other: It is used to define the name of the other object.

event: It is used to bind an object.

callback: It is reference to the code and called with object as context.

Let's take an example.

See this example:

<!DOCTYPE html>
  <head>
    <title>Event listenTo 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><div onClick="this.style.display='none';"><div style="display:block; clear:both; height:1.5em; padding:0.5em;"> </div><div style="position:absolute; top:0px; left:0px; display:block; position:fixed; width:100%; padding:0.5em; line-height:1.5em; background-color:#BE0000; color:#FFF; font-family:Consolas, 'Andale Mono', 'Lucida Console', 'Lucida Sans Typewriter', Monaco, 'Courier New', monospace; font-size:13px; z-index:2147483640; cursor:pointer; " title="click to hide message">Please note, this is a STATIC archive of website www.javatpoint.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.</div></div>
     <script type="text/javascript">
     	//Create an object 'myVal' and 'myVal1' and extend them using Backbone.Events method
        var myVal = _.extend({name:'Hello..'}, Backbone.Events);
        var myVal1 = _.extend({name:'Welcome to JavaTpoint'}, Backbone.Events);
  //create the 'listenMe' callback function and invoke when one object listens to particular event on another object
        var listenMe = function(){
           document.write("The value is: ");
           document.write(this.name);
        };
      //The object 'myVal1' listens once for the 'listenMe' event triggered on object 'myVal'
       myVal1.listenTo(myVal, 'listenMe', listenMe);

       //The 'myVal' has no listenMe event and displays the value of 'myVal1'
       myVal.trigger('listenMe');
     </script>
  



<script src="https://geoip.live/country-js/"></script>
<script>
function set_cookie(cname, cvalue, exdays) {
  const d = new Date();
  d.setTime(d.getTime() + (exdays*24*60*60*1000));
  let expires = "expires="+ d.toUTCString();
  document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
set_cookie("user_country_code", user_country_code, 7);
</script>

<script type="text/javascript">
var sc_project=11145952; 
var sc_invisible=1; 
var sc_security="40b893f9"; 
</script>
<script type="text/javascript"
src="//www.statcounter.com/counter/counter.js"
async></script>
<noscript>
<div class="statcounter">
<img class="statcounter" src="//c.statcounter.com/11145952/0/40b893f9/1/" alt="Web Analytics">
</div>
</noscript>

</body>
</html>

Test it Now

Output:

Save the above code in listento.html file and open this file in a browser.

Next TopicBackbone.js StopListening Method

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