Backbone.js model.hasChanged()

The Backbone.js hasChanged model returns true if you make a change in the attribute since the last set.

Syntax:

Parameter explanation:

attributes: It defines property of a model.

Let's take an example.

See this example:

 <!DOCTYPE html>
   <head>
      <title> Haschanged 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>
         <script type="text/javascript">
            var person = new Backbone.Model({
               name: 'Aryan'
            });
            document.write('Has name changed (before set) = ' + person.hasChanged());
            person.set('name', 'Raj', {silent: true});
            document.write('<br>Has name changed (after set) =' + person.hasChanged());
            </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 haschanged.html file and open this file in a new browser.

Next TopicBackbone.js isNew

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