What is the difference between $(window).load(function() {}) and $(document).ready(function() {}) in jQuery?
11 Answers
document.readyis a jQuery event, it runs when the DOM is ready, e.g. all elements are there to be found/used, but not necessarily all content.window.onloadfires later (or at the same time in the worst/failing cases) when images and such are loaded, so if you're using image dimensions for example, you often want to use this instead.
9 Comments
Michael Butler
shorthand for
$(document).ready(function(){}) is $(function(){}) and another important difference from the window.load is that it will run on ALL future calls of the function, even after the initial DOMready.
Free Lancer
@dbliss Yes I believe onload is shorthand for
$(window).on('load'). Both referencing the load event.
BornToCode
@MichaelButler - What do you mean with
it will run on ALL future calls of the function?
Doug S
@MichaelButler: You need to be more clear in your comment. 1) You're talking about the USER executing more
$(document).ready code after the DOM is ready. That's such a small use case that it probably wasn't worth confusing everyone with mentioning it. 2) The ENVIRONMENT only calls $(document).ready(function(){}) once, when the DOM is ready. If the user, for some reason, executes more $(document).ready after the DOM is ready, then yes, it will be executed immediately.Doug S
I beg to differ, Michael. Let's just leave it at this and not degrade into useless comments. At least the confused people now have their answer.
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$(document).ready(function() {
// executes when HTML-Document is loaded and DOM is ready
alert("document is ready");
});
$(window).load(function() {
// executes when complete page is fully loaded, including all frames, objects and images
alert("window is loaded");
});
2 Comments
erik-stengel
Will 'load' execute again, if e.g. an Ajax request finished after the user started it by clicking a button?
SagarPPanchal
@erik-stengel no!
The $(window).load() is NOT available in jQuery 3.0
$( window ).load(function() {
// Handler for .load() called.
});
To get around it, you can use it as an "Event Handler Attachment"
$( window ).on("load", function() {
// Handler for .load() called.
});
Comments
The difference are:
$(document).ready(function() { is jQuery event that is fired when DOM is loaded, so it’s fired when the document structure is ready.
$(window).load() event is fired after whole content is loaded.
Comments
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script>
$( document ).ready(function() {
alert( "document loaded" );
});
$( window ).load(function() {
alert( "window loaded" );
});
</script>
</head>
<body>
<iframe src="http://stackoverflow.com"></iframe>
</body>
</html>
window.load will be triggered after all the iframe content is loaded
Comments
$(document).ready happens when all the elements are present in the DOM, but not necessarily all content.
$(document).ready(function() {
alert("document is ready");
});
window.onload or $(window).load() happens after all the content resources (images, etc) have been loaded.
$(window).load(function() {
alert("window is loaded");
});
Comments
From jquery prospective - it's just adding load/onload event to window and document.
Check this out:
Comments
$(window).load is an event that fires when the DOM and all the content (everything) on the page is fully loaded like CSS, images and frames. One best example is if we want to get the actual image size or to get the details of anything we use it.
$(document).ready() indicates that code in it need to be executed once the DOM got loaded and ready to be manipulated by script. It won't wait for the images to load for executing the jQuery script.
<script type = "text/javascript">
//$(window).load was deprecated in 1.8, and removed in jquery 3.0
// $(window).load(function() {
// alert("$(window).load fired");
// });
$(document).ready(function() {
alert("$(document).ready fired");
});
</script>
$(window).load fired after the $(document).ready().
$(window).load was deprecated in 1.8, and removed in jquery 3.0
Comments
I think the $(window).load event is not supported by JQuery 3.x
2 Comments
Mathieu VIALES
As per the documentation the $(window).load event was removed in JQuery 3.0
Kean Amaral
This is correct. In order to get around it, you can use it as an "Event Handler Attachment": $( window ).on("load", function() { // Handler for .load() called. });
document.ready (jQuery) document.ready will execute right after the HTML document is loaded property, and the DOM is ready.
DOM: The Document Object Model (DOM) is a cross-platform and language-independent convention for representing and interacting with objects in HTML, XHTML and XML documents.
$(document).ready(function()
{
// executes when HTML-Document is loaded and DOM is ready
alert("(document).ready was called - document is ready!");
});
window.load (Built-in JavaScript) The window.load however will wait for the page to be fully loaded, this includes inner frames, images etc. * window.load is a built-in JavaScript method, it is known to have some quirks in old browsers (IE6, IE8, old FF and Opera versions) but will generally work in all of them.
window.load can be used in the body's onload event like this (but I would strongly suggest you avoid mixing code like this in the HTML, as it is a source for confusion later on):
$(window).load(function()
{
// executes when complete page is fully loaded, including all frames, objects and images
alert("(window).load was called - window is loaded!");
});
Comments
According to DOM Level 2 Events, the load event is supposed to fire on document, not on window. However, load is implemented on window in all browsers for backwards compatibility.
$(window).load(). Use$(window).on('load', function(){});instead.