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Grab largest image on site given the URL

Answer 1

+1 A:

"Largest" image in filesize or image-dimensions? You'll have to parse the URLs code, extract all images and get the size. If you mean the image-dimensions, you can do it with JavaScript (create a new image from the img-source and use img.width and img.height), but for the filesize, you'll probably end up downloading all images to determine which on is the largest.

Select0r 2010-09-01 07:56:22

I mean the largest in terms of image-dimension. It gives the best representation of the site for a thumbnail. Or how about just pulling the Facebook thumbnail it generates for the URL for instance?

jprim 2010-09-01 08:01:58

`just pulling the Facebook thumbnail it generates for the URL` ... ?? You may want to explain that in detail or (even better) put it in a separate question, as this seems to be something very different from your original question. Right now I don't really now what you're after.

Select0r 2010-09-01 08:09:44

Sorry about that. I am looking to pull the site thumbnail generated on:http://www.facebook.com/share.php?u=my_website_urlWhen passing a URL through it (as described above using item.link).Please let me know if you have any other questions. Thank you!

jprim 2010-09-01 08:18:47

Hopefully that answers your question.

jprim 2010-09-01 08:20:06

It is always the image in <div class="UIThumbPager_Thumbs">

jprim 2010-09-01 08:21:50

I can't open your URL as it needs a login and I'm not on facebook, but again: pull the source code, parse it and grab the image. Shouldn't be much of a problem as you know it's always in the same DIV. (And still: your question doesn't reflect what you're actually looking for)

Select0r 2010-09-01 08:29:15

That is what I am asking to do. How do I pull the source code, parase it and grab the image? I updated the question, thanks.

jprim 2010-09-01 08:36:51

Answer 2

+2 A:

You can't do it on the client-side (i.e., with JavaScript) due to cross-domain restrictions. You'd need to download the contents of the URL on the back end first. See here: http://en.wikipedia.org/wiki/Same_origin_policy

Reinis I. 2010-09-01 08:02:25

How about using getElementById("img")?

jprim 2010-09-01 08:03:10

How is that going to work when your "img" is on a remote site?

Select0r 2010-09-01 08:05:53

I think you mean `getElementsByTagName`, and that would still work only if the site was in the same domain.

Reinis I. 2010-09-01 08:07:16

Oh ok, I did not realize it wouldn't work on a remote site.

jprim 2010-09-01 08:19:48

@jprim you'll need a server side script acting as a proxy to do this.

Pekka 2010-09-01 08:40:41

Hi Pekka, what if I just pull the image thumbnail Facebook creates for a URL as described above?

jprim 2010-09-01 08:42:26

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Grab largest image on site given the URL

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