What are differences between
$(document).ready(function(){ //my code here }); and
$(window).load(function(){ //my code here }); And I want to make sure that:
$(document).ready(function(){ }) and
$(function(){ }); and
jQuery(document).ready(function(){ }); are the same.
Can you tell me what differences and similarities between them?
$(document).ready(function() { // executes when HTML-Document is loaded and DOM is ready console.log("document is ready"); }); $(window).load(function() { // executes when complete page is fully loaded, including all frames, objects and images console.log("window is loaded"); });<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>Query 3.0 version
These methods are shortcuts for event operations, but had several API limitations. The event
.load()method conflicted with the ajax.load()method. The.error()method could not be used withwindow.onerrorbecause of the way the DOM method is defined. If you need to attach events by these names, use the.on()method, e.g. change$("img").load(fn)to$(img).on("load", fn).1
$(window).load(function() {}); Should be changed to
$(window).on('load', function (e) {}) These are all equivalent:
$(function(){ }); jQuery(document).ready(function(){ }); $(document).ready(function(){ }); $(document).on('ready', function(){ }) 
.on( "ready", handler ) - deprecated as of jQuery 1.8. see api.jquery.com/ready
$(document).ready and $(document).load?
document.ready is a jQuery event, it runs when the DOM is ready, e.g. all elements are there to be found/used, but not necessarily all the content.
window.onload fires 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.
Also read a related question:
Difference between $(window).load() and $(document).ready() functions
These three functions are the same:
$(document).ready(function(){ }) and
$(function(){ }); and
jQuery(document).ready(function(){ }); here $ is used for define jQuery like $ = jQuery.
Now difference is that
$(document).ready is jQuery event that is fired when DOM is loaded, so it’s fired when the document structure is ready.$(window).load event is fired after whole content is loaded like page contain images,css etc.From the jQuery API Document
While JavaScript provides the
loadevent for executing code when a page is rendered, this event does not get triggered until all assets such as images have been completely received. In most cases, the script can be run as soon as the DOM hierarchy has been fully constructed. The handler passed to.ready()is guaranteed to be executed after the DOM is ready, so this is usually the best place to attach all other event handlers and run other jQuery code. When using scripts that rely on the value of CSS style properties, it's important to reference external stylesheets or embed style elements before referencing the scripts.In cases where code relies on loaded assets (for example, if the dimensions of an image are required), the code should be placed in a handler for the
loadevent instead.
Answer to the second question -
No, they are identical as long as you are not using jQuery in no conflict mode.
The Difference between $(document).ready() and $(window).load() functions is that the code included inside $(window).load() will run once the entire page(images, iframes, stylesheets,etc) are loaded whereas the document ready event fires before all images,iframes etc. are loaded, but after the whole DOM itself is ready.
$(document).ready(function(){ }) and
$(function(){ }); and
jQuery(document).ready(function(){ }); There are not difference between the above 3 codes.
They are equivalent,but you may face conflict if any other JavaScript Frameworks uses the same dollar symbol $ as a shortcut name.
jQuery.noConflict(); jQuery.ready(function($){ //Code using $ as alias to jQuery }); 
$(document).ready(function(e) { // executes when HTML-Document is loaded and DOM is ready console.log("page is loading now"); }); $(document).load(function(e) { //when html page complete loaded console.log("completely loaded"); }); 
The ready event is always execute at the only html page is loaded to the browser and the functions are executed.... But the load event is executed at the time of all the page contents are loaded to the browser for the page..... we can use $ or jQuery when we use the noconflict() method in jquery scripts...
$(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().
$(document).ready(function(){ }) //and $(function(){ }); //and jQuery(document).ready(function(){ }); Above 3 are same, $ is the alias name of jQuery, you may face conflict if any other JavaScript Frameworks uses the same dollar symbol $. If u face conflict jQuery team provide a solution no-conflict read more.
$(window).load was deprecated in 1.8, and removed in jquery 3.0
