Vanilla JavaScript equivalent of jQuery s ready - how to call a function when the page DOM is ready for it

0 votes

With jQuery, we all know the wonderful .ready() function:

$('document').ready(function(){});

However, suppose I want to execute a function written in normal JavaScript with no library support, and I want to launch it as soon as the website is ready to handle it. 

What is the right strategy here? I know what I'm capable of:

window.onload="myFunction()";

Or I can use the body tag:

<body onload="myFunction()">

Or I can even try at the bottom of the page after everything, but the end body or Html tag like:

<script type="text/javascript">
    myFunction();
</script>

What is a cross-browser(old/new) technique of issuing one or more functions in the same way as jQuery's $.ready() does?

Nov 7, 2022 in Java by Nicholas
 • 7,760 points • 2,994 views

1 answer to this question.

0 votes

Use Internet Explorer 9 or later if you're using VANILLA pure JavaScript without jQuery.

document.addEventListener("DOMContentLoaded", function(event) {
    // Your code to run since DOM is loaded and ready
});

Above is the equivalent of jQuery .ready:

$(document).ready(function() {
    console.log("Ready!");
});


This ALSO could be written SHORTHAND like this, which jQuery will run after the ready even occurs.

$(function() {
    console.log("ready!");
});

NOT TO BE CONFUSED with BELOW (which is not meant to be DOM ready):

DO NOT use an IIFE like this that is self-executing:

 Example:

(function() {
   // Your page initialization code here  - WRONG
   // The DOM will be available here   - WRONG
})();


This IIFE will NOT wait for your DOM to load. (I'm even talking about the latest version of Chrome browser!)

answered Nov 8, 2022 by Damonlang
 • 700 points

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