Question

Technologies:

javascript

Tolerim

a few seconds ago

Does the loading of a JS depend on the browser being used?

My JavaScript code works well, and I link it to my HTML page using the standard meta tag:

<script src="js/my_script.js"></script>

However, I want to prevent my_script.js from loading when the page is opened in Mozilla Firefox. Is it possible to achieve this, and if so, how can I do it?

Previously, I attempted to conditionally load my_script.js using the following code, but it failed:

<script>
    if($.browser.mozilla) { 
        jQuery.getScript("js/blank_script.js");
    } else {        
        jQuery.getScript("js/my_script.js");            
    }
</script>

Is there a viable solution to this problem? Thank you for your assistance.

Answers(1)

Accepted Answer

Yes, it is possible to conditionally load a script based on the browser type. However, the $.browser object was removed from the jQuery library since version 1.9. Therefore, you cannot use $.browser.mozilla to detect the Firefox browser anymore. One way to achieve the desired result is to use the navigator.userAgent property to check the user agent string of the browser. Here's an example code snippet that shows how to load the my_script.js only if the browser is not Firefox:

<script>
  var isFirefox = typeof InstallTrigger !== 'undefined';
  if (!isFirefox) {
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'js/my_script.js';
    document.head.appendChild(script);
  }
</script>

In this example, we first define a variable isFirefox that checks whether the InstallTrigger object is defined in the browser (which is true only for Firefox). Then, we wrap the loading of my_script.js inside an if statement that checks whether isFirefox is false. Finally, we create a new script element, set its src attribute to the URL of my_script.js, and append it to the head element of the HTML document. Note that this method only prevents the script from being loaded by Firefox browsers. It does not prevent users from manually enabling the script or accessing its content through other means.