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 • 3,045 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

Related Questions In Java

0 votes
3 answers

How to check whether a string is empty or not? Is there a function for this?

str != null && str.length() != 0 alternatively str ...READ MORE

answered Sep 11, 2018 in Java by Sushmita
 • 6,920 points • 1,466 views
0 votes
2 answers

How can I invoke a method when the method name is in the form of a given string?

You could probably use method invocation from reflection: Class<?> ...READ MORE

answered Aug 19, 2019 in Java by Sirajul
 • 59,230 points • 3,095 views
0 votes
1 answer

What is the equivalent to a JavaScript setInterval/setTimeout in Android/Java?

Hii @kartik, As always with Android there's lots ...READ MORE

answered May 26, 2020 in Java by Niroj
 • 82,840 points • 3,696 views
0 votes
1 answer

Is it possible to run a java program from command line on windows?How?

  Let's say your file is in C:\myprogram\ Run ...READ MORE

answered Apr 18, 2018 in Java by sophia
 • 1,400 points • 2,717 views
0 votes
1 answer

What is jQuery?

Hey, jQuery is a fast and concise JavaScript ...READ MORE

answered Feb 14, 2020 in JQuery by kartik
 • 37,520 points • 1,347 views
0 votes
1 answer

Uncaught TypeError: Cannot read property 'msie' of undefined - jQuery tools

Hello, Use the following script tag in your ...READ MORE

answered Apr 28, 2020 in JQuery by Niroj
 • 82,840 points • 15,870 views
0 votes
1 answer

Uncaught Error: Bootstrap's JavaScript requires jQuery

Hello @kartik, You have provided wrong order for ...READ MORE

answered Apr 28, 2020 in JQuery by Niroj
 • 82,840 points • 23,376 views
0 votes
1 answer

How to make Bootstrap popover Appear/Disappear on hover instead of click?

Hello @kartik, Set the trigger option of the popover to hover instead ...READ MORE

answered May 12, 2020 in JQuery by Niroj
 • 82,840 points • 3,339 views
0 votes
1 answer

How to trigger a file download when clicking an HTML button or JavaScript

You can trigger a download with the ...READ MORE

answered Nov 7, 2022 in Java by Damonlang
 • 700 points • 2,678 views
0 votes
1 answer

How to decode jwt token in javascript without using a library?

Working unicode text JWT parser function: function parseJwt ...READ MORE

answered Nov 4, 2022 in Java by Damonlang
 • 700 points • 7,394 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP
"PMP®","PMI®", "PMI-ACP®" and "PMBOK®" are registered marks of the Project Management Institute, Inc. MongoDB®, Mongo and the leaf logo are the registered trademarks of MongoDB, Inc.