Comments on: Injecting JavaScript and CSS into Iframes

By: henry

henry — Tue, 05 May 2009 07:11:47 +0000

just found this page and found it interesting. is there a way to “inject” the javascript to an iframe to displays a page from another site?

By: ramon soler

ramon soler — Mon, 19 May 2008 07:43:47 +0000

I am trying to do an injection of variables from a javacript page into a iframe.src reading from same domain as a text file and when debugging it works until exit the routine then the variables values disappear what can be the trouble
thanks in advance
r.soler

By: zane qian

zane qian — Sat, 12 Apr 2008 04:28:57 +0000

Hi Matt,
I’m the bigener of using javascript and ext. Could U send the sample files to me?
Thanks.

By: Jason Albert

Jason Albert — Thu, 20 Mar 2008 17:55:34 +0000

I’m curious…
Am I missing something? I can’t see the benefit of this method vs regular browser caching.

Say I have a script file thats downloaded in a page, all the iframes on that page would not have to download that same file as it would be already cached by the browser.

I can see where this is useful if caching is turned off in a users browser but otherwise what purpose does this serve.

By: Sid Bachtiar

Sid Bachtiar — Tue, 09 Oct 2007 08:50:42 +0000

Hi Matt,

One thing that came to my mind is that there already are ways to tell browsers to cache Javascript and CSS files.

Apart from that, I can’t think of anything wrong with using this technique. I don’t think it exposes any security hole either.

I think similar technique is used with Google maps; using iframe instead of ajax (not sure if injection is used too), because iframe technique allows user to use the back button, unlike usual AJAX stuffs.

Just my 2c

By: Steven Roussey

Steven Roussey — Thu, 19 Apr 2007 05:15:53 +0000

Just a note… iFrames won’t download additional copies and use bandwidth. They will use the browsers cache. A lot of developers get confused by this sometimes when they are using Firebug or other developer toolbars, etc. Firefox does not allow Firebug to see what is in the cache, so Firebug forces a reload of all CSS and JS files so it can parse them.

Just a FYI. Sometimes we forget the basics… like a browser cache.