Ways to verify if all javascript and css files have been successfully loaded

Question

Ways to verify if all javascript and css files have been successfully loaded

I have been exploring different ways to notify users if certain resources do not load correctly.

So far, I have come across the following methods:

For CSS, I stumbled upon an example in the source code of Trello:

<div id="nocss"> 
  Your browser was unable to load all of Trello's resources. They may have been blocked by your firewall, proxy, or browser configuration.
  <br>Press Ctrl+F5 or Ctrl+Shift+R to have your browser try again. 
  <hr>
</div>

Additionally, in the last CSS file that was downloaded, I found the following CSS properties:

#nocss {
 display: none;
}

For JS, I read an article titled The best way to load external JavaScript, but I am still unsure about it.

UPDATE

Just a small update: the ideal solution should also be compatible with files from Content Delivery Networks (CDNs), as they tend to pose the biggest challenge. I once encountered a situation where jQuery, added to a site, was blocked by companies behind certain firewalls.

javascript html css

Answer 1

Answer №1

Just like you can manipulate your CSS with JavaScript, the same can be done with your JavaScript code.

$(document).ready(function(){
    $("#nojs").css("display","none");
}

This script utilizes jQuery. When placed at the beginning of your JavaScript file, it conceals a div similar to how CSS hides elements once the JavaScript is loaded. (Remember to have a <div id="nojs"> in your HTML).

Answer 2

Just like you can manipulate your CSS with JavaScript, the same can be done with your JavaScript code.

$(document).ready(function(){
    $("#nojs").css("display","none");
}

This script utilizes jQuery. When placed at the beginning of your JavaScript file, it conceals a div similar to how CSS hides elements once the JavaScript is loaded. (Remember to have a <div id="nojs"> in your HTML).

Answer 3

Answer №2

To enhance the functionality of your website, consider adding a unique class to the body element for each successfully loaded JS file. This can be achieved by writing code within each JS file to add an additional CSS class to the body element like this

$(document.body).addClass("SomeClass")

. After adding classes, you can check if all classes are present with the following code:

if (!$(document.body).hasClass("ALL YOUR CLASSES")){
    $("nojs").show();
}

Implementing this should help solve the issue.

If you do not have the ability to access or modify the JS files directly, you can use a workaround like the one below:

<script>!window.jQuery && document.write('<script src="js/jquery-1.4.2.min.js"><\/script>')</script>

(Adapted from HTML5 Boilerplate)

Answer 4

To enhance the functionality of your website, consider adding a unique class to the body element for each successfully loaded JS file. This can be achieved by writing code within each JS file to add an additional CSS class to the body element like this

$(document.body).addClass("SomeClass")

. After adding classes, you can check if all classes are present with the following code:

if (!$(document.body).hasClass("ALL YOUR CLASSES")){
    $("nojs").show();
}

Implementing this should help solve the issue.

If you do not have the ability to access or modify the JS files directly, you can use a workaround like the one below:

<script>!window.jQuery && document.write('<script src="js/jquery-1.4.2.min.js"><\/script>')</script>

(Adapted from HTML5 Boilerplate)

Answer 5

Answer №3

Is it possible to avoid relying on any other approach and instead utilize

window.onload=function(){SomeJavaScriptCode};

or

<body onload="SomeJavaScriptCode">

These methods will only be triggered once all the elements of your webpage have been fully loaded. (The onload event is commonly used within the body element to run a script after all content, such as images, scripts, and CSS files, has finished loading.)

Answer 6

Is it possible to avoid relying on any other approach and instead utilize

window.onload=function(){SomeJavaScriptCode};

or

<body onload="SomeJavaScriptCode">

These methods will only be triggered once all the elements of your webpage have been fully loaded. (The onload event is commonly used within the body element to run a script after all content, such as images, scripts, and CSS files, has finished loading.)

Ways to verify if all javascript and css files have been successfully loaded

Answer №1

Answer №2

Answer №3

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