[gentoo-amd64] Unstable images in Firefox

[gentoo-amd64] Unstable images in Firefox

[Peter Humphrey]

Quite often, when I'm viewing a Web page that uses Javascript to overlay a 
picture with enlarged sections of itself, I find a very rapid flickering of 
the overlaid section alternating with the background picture. Here's an 
example: http://heritage.stsci.edu/2007/16/supplemental.html. Does anyone 
else find this? About Firefox says: Mozilla/5.0 (X11; U; Linux x86_64; 
en-GB; rv:1.8.1.3) Gecko/20070411 Firefox/2.0.0.3.

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Rgds
Peter Humphrey
Linux Counter 5290, Aug 93
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Re: [gentoo-amd64] Unstable images in Firefox

[Bernhard Berger]

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Hi

> Quite often, when I'm viewing a Web page that uses Javascript to
> overlay a picture with enlarged sections of itself, I find a very
> rapid flickering of the overlaid section alternating with the
> background picture. Here's an example:
> http://heritage.stsci.edu/2007/16/supplemental.html. Does anyone else
> find this? About Firefox says: Mozilla/5.0 (X11; U; Linux x86_64;
> en-GB; rv:1.8.1.3) Gecko/20070411 Firefox/2.0.0.3.

Same problem here. About Firefox says: Mozilla/5.0 (X11; U; Linux i686;
de; rv:1.8.1.3) Gecko/20070417 Firefox/2.0.0.3. It seems that it is not
a x86_64 related problem.

Bernhard

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Re: [gentoo-amd64] Unstable images in Firefox

[Barry Walsh]

Bernhard Berger wrote:
> Hi
>
>   
>> Quite often, when I'm viewing a Web page that uses Javascript to
>> overlay a picture with enlarged sections of itself, I find a very
>> rapid flickering of the overlaid section alternating with the
>> background picture. Here's an example:
>> http://heritage.stsci.edu/2007/16/supplemental.html. Does anyone else
>> find this? About Firefox says: Mozilla/5.0 (X11; U; Linux x86_64;
>> en-GB; rv:1.8.1.3) Gecko/20070411 Firefox/2.0.0.3.
>>     
>
> Same problem here. About Firefox says: Mozilla/5.0 (X11; U; Linux i686;
> de; rv:1.8.1.3) Gecko/20070417 Firefox/2.0.0.3. It seems that it is not
> a x86_64 related problem.
>
> Bernhard
>   
It's also the same on Firefox 2.003 on WinXP 32bit , so it's not an x64 
or Linux specific issue.
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Re: [gentoo-amd64] Unstable images in Firefox

[Etaoin Shrdlu]

On Monday 30 April 2007 11:37, Bernhard Berger wrote:

> Same problem here. About Firefox says: Mozilla/5.0 (X11; U; Linux
> i686; de; rv:1.8.1.3) Gecko/20070417 Firefox/2.0.0.3. It seems that it
> is not a x86_64 related problem.

I see the problem with firefox under windows also...
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[gentoo-amd64] Re: Unstable images in Firefox

[Harm Geerts]

On Monday 30 April 2007, Peter Humphrey wrote:
> Quite often, when I'm viewing a Web page that uses Javascript to overlay a
> picture with enlarged sections of itself, I find a very rapid flickering of
> the overlaid section alternating with the background picture. Here's an
> example: http://heritage.stsci.edu/2007/16/supplemental.html. Does anyone
> else find this? About Firefox says: Mozilla/5.0 (X11; U; Linux x86_64;
> en-GB; rv:1.8.1.3) Gecko/20070411 Firefox/2.0.0.3.

That's a scripting error, when you see the enlargement on mouseover the height 
of the page increases. The increase causes the loss of the mouseover event en 
then the page restores to it's original height.

If you increase the size of the browserwindow/desktop so that the enlarged 
picture doesn't cause the page to scroll the javascript function works fine.
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Re: [gentoo-amd64] Unstable images in Firefox

[Richard Freeman]

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Peter Humphrey wrote:
> Quite often, when I'm viewing a Web page that uses Javascript to overlay a 
> picture with enlarged sections of itself, I find a very rapid flickering of 
> the overlaid section alternating with the background picture. 

Hmm - I don't get that behavior on konqueror, but the page sure is
annoying - the pictures don't go away when you move the mouse away, and
they don't always load on top of any other pictures that have loaded.

Probably incorrect scripting that happens to render as desired on one
particular browser...

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Re: [gentoo-amd64] Re: Unstable images in Firefox

[Dustin C. Hatch]

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This is in fact a scripting error.  It doesn't have anything to do with
the scroll bar, though.  I have my resolution at 1066x1200 which
provides ample room for the page to render and the scrollbar is never
invoked.

At any rate, I have seen this error before with my own scripts.  In
essence, this is what happens

   1. Mouse hovers over specified area and triggers onmouseover event
   2. onmouseover event calls a function that places a new image at the
      mouse cursor
   3. The mouse cursor is now over the new image so onmouseout is
      triggered from the original image
   4. onmouseout removes the new image
   5. The mouse cursor is now over the original image again, triggering
      onmouseover
   6. Go to step 2

This looping is what causes the flickering image.  If you are the
developer of the page, I would suggest you look into one of these solutions:

    * When the new hovering image is created, its absolute position
      should be such that it does not appear under the mouse cursor
    * When the new hovering image receives focus, a variable is set and
      unset when focus is lost. onmouseout on the original image should
      check to see if this variable is set before removing the original
      image

If you are not the developer, feel free to forward this message to
whoever is.  Hope this helps.

Dustin C. Hatch
http://www.dchweb.com



Harm Geerts wrote:
> On Monday 30 April 2007, Peter Humphrey wrote:
>   
>> Quite often, when I'm viewing a Web page that uses Javascript to overlay a
>> picture with enlarged sections of itself, I find a very rapid flickering of
>> the overlaid section alternating with the background picture. Here's an
>> example: http://heritage.stsci.edu/2007/16/supplemental.html. Does anyone
>> else find this? About Firefox says: Mozilla/5.0 (X11; U; Linux x86_64;
>> en-GB; rv:1.8.1.3) Gecko/20070411 Firefox/2.0.0.3.
>>     
>
> That's a scripting error, when you see the enlargement on mouseover the height 
> of the page increases. The increase causes the loss of the mouseover event en 
> then the page restores to it's original height.
>
> If you increase the size of the browserwindow/desktop so that the enlarged 
> picture doesn't cause the page to scroll the javascript function works fine.
>   

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Re: [gentoo-amd64] Re: Unstable images in Firefox

[Peter Humphrey]

On Monday 30 April 2007 12:49:12 Dustin C. Hatch wrote:
> This is in fact a scripting error.  It doesn't have anything to do with
> the scroll bar, though.  I have my resolution at 1066x1200 which
> provides ample room for the page to render and the scrollbar is never
> invoked.

My screen is at 1600x1200, but still not enough to show this page properly.

> If you are not the developer, feel free to forward this message to
> whoever is.  Hope this helps.

Thanks - I've sent it on to the webmaster.

-- 
Rgds
Peter Humphrey
Linux Counter 5290, Aug 93
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Re: [gentoo-amd64] Re: Unstable images in Firefox

[Peter Humphrey]

On Tuesday 01 May 2007 08:54:57 I wrote:
> On Monday 30 April 2007 12:49:12 Dustin C. Hatch wrote:
> > This is in fact a scripting error.  It doesn't have anything to do with
> > the scroll bar, though.  I have my resolution at 1066x1200 which
> > provides ample room for the page to render and the scrollbar is never
> > invoked.
>
> My screen is at 1600x1200, but still not enough to show this page
> properly.
>
> > If you are not the developer, feel free to forward this message to
> > whoever is.  Hope this helps.
>
> Thanks - I've sent it on to the webmaster.

Looks like they've fixed it, though I haven't had any message from them. 
Today when I view the page it works properly.

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Rgds
Peter Humphrey
Linux Counter 5290, Aug 93
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Re: [gentoo-amd64] Re: Unstable images in Firefox

[Peter Humphrey]

On Thursday 03 May 2007 10:58:18 I wrote:
> On Tuesday 01 May 2007 08:54:57 I wrote:
> > On Monday 30 April 2007 12:49:12 Dustin C. Hatch wrote:
> > > This is in fact a scripting error.  It doesn't have anything to do
> > > with the scroll bar, though.  I have my resolution at 1066x1200 which
> > > provides ample room for the page to render and the scrollbar is never
> > > invoked.
> >
> > My screen is at 1600x1200, but still not enough to show this page
> > properly.
> >
> > > If you are not the developer, feel free to forward this message to
> > > whoever is.  Hope this helps.
> >
> > Thanks - I've sent it on to the webmaster.
>
> Looks like they've fixed it, though I haven't had any message from them.
> Today when I view the page it works properly.

Well, I had nothing to do with it - I've just had my e-mail returned 
undeliverable. It seems they don't have a webmaster@... address.

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Rgds
Peter Humphrey
Linux Counter 5290, Aug 93
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