301971 - Frame reloads when switching from display:none to display:block

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Thorsten Suckow-Homberg]

User-Agent:       Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.8) Gecko/20050511 Firefox/1.0.4

I have a dynamic webpage with an iframe which can be switched from 
display:block to display:none and vice versa. The iframe can also load 
documents with framesets defined in them. 
When I want to hide the iframe and reshow it, the page-contents of the frames 
defined in the frameset (which where loaded into the iframe) are reloading.

Reproducible: Always

Steps to Reproduce:
1. Create a page with an iframe. Point the src-attribute to html-file with a 
frameset defined in it.
2. Create a button with the appropriate javascript-function that can 
dynamically set the style-attribute display:none and display:block
3. Press the button!
Actual Results:  
The iframe is not visible anymore. After switching back to reshow the iframe, 
the contents of the frameset within the iframe where reloaded.

Expected Results:  
It should have not reloaded the frameset within the iframe.

Comment 1

[Aaron Slunt]

I suspect this is because display:none remove the element and its resources
altogether from the page.

Try visibility:hidden;.

I could be wrong though.

Comment 2

[Thorsten Suckow-Homberg]

(In reply to comment #1)
> I suspect this is because display:none remove the element and its resources
> altogether from the page.
The reload does not happen when the iframe holds a regular page (without a 
frameset defined in it).  

> Try visibility:hidden;.
Its not an option... it would be an ugly workaround. the Display:block removes 
the element, whereas visibility only hides it, but does not leave any room for 
other elements to use the space.

Comment 3

[Steve England [:stevee]]

reporter, does this happen with deer park alpha 2? (firefox 1.1 alpha)?
If so, can you attach a testcase?

Comment 4

[Thorsten Suckow-Homberg]

(In reply to comment #3)
> reporter, does this happen with deer park alpha 2? (firefox 1.1 alpha)?
> If so, can you attach a testcase?

Fortunately, the frameset does not get reloaded in Deer Park Alpha 2 
(Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b3) Gecko/20050712 
Firefox/1.0+)

It works like a charm! :)

Comment 5

[Jesse Ruderman]

WFM on trunk per comment 4 from the reporter.

See also bug 343235, "iframe content is reloaded if its parentNode changed".