Ticket #36 (new defect)

Opened 1 year ago

Last modified 6 months ago

GreaseMonkey won't run in hidden iframes

Reported by: mjk49..@yahoo.com Assigned to:
Priority: major Milestone:
Version: Keywords:
Cc:

Description

If a page contains an Iframe that is not displayed and that iframe loads content that should cause a GreaseMonkey? script to execute, the script will not run. It will only run on visible Iframes.

The attached files demonstrate the problem. Install the script which just adds text to the bottom of all pages. Then open the test.html file. This contains 2 iframes: one visible and one hidden. A tab panel at the top of the page is used to "switch" between them. 2 links at the top of the page will load www.google.com in the specified "tab" (iframe). The iframes have an onload function which will display that iframe and hide the other when a page loads.

Tests:

1. With tab 1 displayed click load google in tab 2. This will load http://www.google.com in the hidden iframe "Tab2pane" and then display it.

2. With tab 2 displayed click load google in tab 2.

Expected results:

Both should display the text "Grease Monkey ran on this page".

Actual results:

Only test #2 displays the text. Greasemonkey never executed on the hidden iframe.

Attachments

test.html (2.5 kB) - added by mjk49..@yahoo.com on 07/24/07 12:59:09.
Test HTML file containing hidden iframes
testscript.user.js (315 bytes) - added by mjk49..@yahoo.com on 07/24/07 13:01:16.
Test GM script to put text on bottom of every page

Change History

07/24/07 12:59:09 changed by mjk49..@yahoo.com

  • attachment test.html added.

Test HTML file containing hidden iframes

07/24/07 13:01:16 changed by mjk49..@yahoo.com

  • attachment testscript.user.js added.

Test GM script to put text on bottom of every page

07/24/07 13:44:01 changed by aranti..@gmail.com

Your issue seems valid, but your test case is unnecessarily complex. It just takes a few lines of simple HTML: 

<html><body>
<iframe src='http://www.google.com/'></iframe>
<hr>
<iframe src='http://www.google.com/' style='display:none;'></iframe>
</body></html>

And one line of .user.js: 

alert('GreaseMonkey Ran!');

To see this happening.

Unfortunately, my intuition tells me that Firefox is simply not generating a DOMContentLoaded event. I'll check to see if that's really the case.

07/25/07 17:52:37 changed by aranti..@gmail.com

  • cc set to aranti..@gmail.com.

07/25/07 18:45:51 changed by aranti..@gmail.com

  • cc deleted.

Confirmed. No DOMContentLoaded event is fired on an iframe that is "display:none". This event is how Greasemonkey knows there is a new page ready to be greased. Without it, there isn't much we can do.

I've checked, and we don't get a regular "load" event, either. This must be intentional, but I don't know for sure, or if so why.

I'd suggest following up with support about mozilla, why these events are not bubbled upwards in this case.

07/26/07 10:09:57 changed by mjk49..@yahoo.com

Okay, I'll open up a bug with Firefox.

Thank you.

07/26/07 11:07:41 changed by mjk49..@yahoo.com

I found that the following works, which is done with just scripting and not using Grease Monkey. Any idea why that works Grease Monkey does not?

Replacing "load" with "DOMContentLoaded" doesn't work, but I'm not sure I'm attaching the event to the correct element.

I noticed that GM listens for the "DOMContenetLoaded" event on the appcontent element, is that what should be firing when an iframe loads?

I'm trying to write up a bug report for Mozilla without specifying that the problem only occurs in Grease Monkey so I want to put together something that doesn't use GM. 

<html><body>
<iframe id="frame1" src='http://www.google.com/'></iframe>
<hr>
<iframe id="frame2" src='http://www.google.com/' style='display:none;'></iframe>

<script language="javascript">
var frame1 = document.getElementById("frame1");
var frame2 = document.getElementById("frame1");

function listener1() {
  alert("frame 1 loaded");
}

function listener2() {
  alert("frame 2 loaded");
}
	
frame1.addEventListener('load', listener1, false);
frame2.addEventListener('load', listener2, false);
</script>
</body></html>

07/26/07 11:24:11 changed by aranti..@gmail.com

Take a look at: http://developer.mozilla.org/en/docs/Code_snippets:On_page_load

It does not fire the load event for hidden iframes. If you want to test this, userChrome.js is probably the easiest path.

Feel free to try the same code with the "DOMContentLoaded" event, too.

07/26/07 12:42:29 changed by boo..@youngpup.net

Maybe there is something that we can do that will make this work. Let's leave the bug open for investigation.

07/26/07 13:22:58 changed by mjk49..@yahoo.com

Well in the meantime I opened a bug against Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=389702

If they fix it great, if they reject it...

08/14/07 18:16:11 changed by anonymous

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12/22/07 15:50:01 changed by thalam..@hotmail.com

It's my understanding that a hidden object shouldn't receive/send any events to protect the user from unwarranted attacks. The last thing I would need is a foreign script trying to gather intel on my surfing habits (outside of the headers of course). Anywhoo...that's my understanding.

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Add/Change #36 (GreaseMonkey won't run in hidden iframes)