Error document ready equivalent without jQuery

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I have a script that uses $(document).ready, but it doesn't use anything else from jQuery. I'd like to lighten it up by removing the jQuery dependency.

How can I implement my own $(document).ready functionality without using jQuery? I know that using window.onload will not be the same, as window.onload fires after all images, frames, etc. have been loaded.
Jun 8, 2020 in Java-Script by kartik
• 37,510 points
122 views

1 answer to this question.

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Hello @kartik,

Extends DOMContentLoaded so that it can be accepted at all the browsers.

This function is the equivalent of jQuery's $(document).ready() method:

document.addEventListener('DOMContentLoaded', function(){
    // do something
});

However, in contrast to jQuery, this code will only run properly in modern browsers (IE > 8) and it won't in case the document is already rendered at the time this script gets inserted (e.g. via Ajax). Therefore, we need to extend this a little bit:

function run() {
    // do something
}

// in case the document is already rendered
if (document.readyState!='loading') run();
// modern browsers
else if (document.addEventListener) 
document.addEventListener('DOMContentLoaded', run);
// IE <= 8
else document.attachEvent('onreadystatechange', function(){
    if (document.readyState=='complete') run();
});

This covers basically all possibilities and is a viable replacement for the jQuery helper.

Hope it helps!!

answered Jun 8, 2020 by Niroj
• 82,720 points

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