How can I detect with JavaScript or jQuery when an image has finished loading, be it from the server or the browser cache?
I want to load various images in the same <img/> tag and detect when the loading of a new images has finished.
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Do you want to do a callback on load, or just detect it? If call back, as the accepted answer, possible duplicate of: stackoverflow.com/questions/4100252/…Ciro Santilli OurBigBook.com– Ciro Santilli OurBigBook.com2014-06-13 07:57:06 +00:00Commented Jun 13, 2014 at 7:57
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7 Answers
$('img').on('load', function() {
// do whatever you want
});
7 Comments
Francisc
Hey, thanks Matt. Does that handler fire each time a new src is set for the img tag? (much like a value commit)
Gabriele Petrioli
that will not work if the image is in the DOM already when you assign the handler, and the cached version is used..
Francisc
The <img/> tag will already be in the DOM when the handler is required.
Francisc
No I didn't try, I'll implement it after I am sure it's what I need. :)
T.J. Crowder
@Gaby: As I said, "...the more critical issue is making sure you've hooked the event before the image has loaded."
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The onload document's event will fire only after all the elements, images included, have fully loaded.
The onload <img>'s event will fire after the single image have fully loaded.
So you can attach a listener to these events, using jQuery objects or DOM's addEventListener (and IE's attachEvent)
Comments
Well, this is quite an old thread I came across yesterday. I'm using backbone.js and require.js and resizing my layout always caused problems with views that contain images.
So, I needed a way to know when the last image has finished loading to resize the layout. All, mentioned solutions above didn't work in my case. After some hours of more investigation I found the ultimate solution that is working:
http://desandro.github.com/imagesloaded/
Hope that helps others as well.
Comments
I think this looks a bit cleaner
$('img').load(function() {
// Your img has finished loading!
});
Comments
For a more thorough image load detection, including images loaded from cache, try this: https://github.com/paulirish/jquery.imgloaded
Comments
From a very similar question Official way to ask jQuery wait for all images to load before executing something and just like Pikrass says:
With jQuery, you use
$(document).ready()to execute something when the DOM is loaded and$(window).load()to execute something when all other things are loaded as well, such as the images.
Here are two examples:
##DOM
jQuery(document).ready(function(){
console.log('DOM ready');
});
##Images / Everything Else
jQuery(window).load(function(){
console.log('all other things ready');
});
You should be able to confirm in your console:
Comments
Everyone mentioned that the event should be fired before set to the src.
But if you don't want to worry about it, you can use the oncomplete event (will be fired even with cached images) to fire onload, like this:
$("img").one("load", function() {
// do stuff
}).each(function() {
if(this.complete) $(this).load();
});
Using jQuery you don't have to worry about backward compatibility (eg: img.height>0 in IE)
answered Jul 24, 2015 at 20:01
Tomas Ramirez Sarduy
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