Backbone.js Event listenToOnce()

Backbone.js Event listenToOnce method is same as listenTo event but the only difference that causes the listen to occur only once before the callback function is being removed.

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 listenToOnce 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:'SSSIT'}, Backbone.Events);
        var myVal1 = _.extend({name:'JavaTpoint'}, Backbone.Events);
 //created the 'listenMe' callback function and invoked when one object listen to particular event on another object
        var listenMe = function(){
           document.write("The value is: ");
           document.write(this.name);
        };

        //The object 'myVal1' listen once for the 'listenMe' event triggered on object 'myVal'
        myVal1.listenToOnce(myVal, 'listenMe', listenMe);

        //The 'myVal' has no listenMe event and display 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 listentoonce.html file and open this file in a browser.

Next TopicBackbone.js Model

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