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How to test if jquery lazy loading works?

Posted on 2013-06-10
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Last Modified: 2013-06-12
So, I finally got this example working

https://github.com/tuupola/jquery_lazyload#readme

Now, how can I actually test to see if the lazy loading works? I use Chrome and I can see the script and the class="lazy" on the image tags...but how can I know it's actually working? what test can I run?

thanks
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Question by:Camillia
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Expert Comment

by:Randy Downs
ID: 39235818
The best way to test is to create 2 identical pages: one with lazy and another without. Time the download of both. Lazy should download faster since it delays images.
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Expert Comment

by:Gary
ID: 39235829
In Developer Tools under Network you can see assets as they are loaded.
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Author Comment

by:Camillia
ID: 39235848
Yes, I see the lazy load jquery in the list, in developer tools.
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Accepted Solution

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Gary earned 500 total points
ID: 39235855
If you are on the Network tab you should the images load as you scroll down your web page - if it is working correctly
The jquery will load straight away anyway - you need to see if the images are being added to the list as you scroll or if they are all being loaded at page load.
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Author Comment

by:Camillia
ID: 39235875
so, scroll up and down the page and look at the network tab , column "name" to see if the images are being displayed in that column??

If that's the case...i don't see the "network" tab being refreshed with new data...
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Expert Comment

by:Gary
ID: 39235885
Then its not working - a live link will help or even just a test page of your code.
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Author Comment

by:Camillia
ID: 39235901
Would a page source work? I don't want to post a link here, but i will, if i have to.
I've attached page source.
page-source.txt
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Author Comment

by:Camillia
ID: 39235936
This is how I load it, maybe this is not correct

$("body").append('<script>$("img.lazy").lazyload();</script>');

And when it renders, it looks like this


..... code here
<script>$("img.lazy").lazyload();</script>
</body>
</html>
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Author Comment

by:Camillia
ID: 39235962
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Expert Comment

by:Gary
ID: 39237986
That's a lot of code to try and debug
You have js error's with app.search.results and this.httpchannel

But all the images seem to be not found.
Why are using append to add the script. You should just add the script at the end of the page or put it in a document.ready function.
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Author Comment

by:Camillia
ID: 39238018
sorry, i was just testing that's why images are not found. Can you try that link again?
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Author Comment

by:Camillia
ID: 39238031
>>Why are using append to add the script. You should just add the script at the end of the page or put it in a document.ready function.

Because this is a vendor app and I cant just easily add code to it. So I added it here, in this code.

Now someone said i don't see it working because the images are too small.
// app initializations called from jQuery(document).ready at the end of the file
			init: function() {
				// register initializations here
				
				// quick view dialog div
				jQuery("<div/>").attr("id", "QuickViewDialog").html(" ").appendTo(document.body);
				
				// bonus product dialog div
				jQuery("<div/>").attr("id", "BonusProductDialog").html(" ").appendTo(document.body);
				
				
				$("body").append('<script>$("img.lazy").lazyload();</script>'); 

...

Open in new window

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Expert Comment

by:Gary
ID: 39238128
Not sure about this, but I would think, you would need the lazyload in a function and then call the function after it has been appended

$("body").append('<script>function dolazyload(){$("img.lazy").lazyload();}</script>');
dolazyload();
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Author Comment

by:Camillia
ID: 39238148
i can try it.
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