Firefox scrolling issue

[crunchMember]

Hi,

I experience a problem with scrolling in virtual mode on Firefox (IE, Chrome work fine). It’s hard to isolate but during testing I noticed some strange behavior that might be related. This behavior can be reproduced in the 3.04 grid demos with the virtualscrolling.htm sample.

Using firebug, I select the right scrollbar with id verticalScrollBarjqxgrid and (using right click) enable ‘log events’ in the context menu. This will now show all scrollbar related events in the firebug console. When I now click (and release) on the lower arrow down scrollbar button (jqxScrollBtnDownverticalScrollBartabGrid) I will see a continues series of events in the firebug console:

click clientX=0, clientY=0 » div#jqxScrollBtnDownverticalScrollBarjqxgrid.jqx-scrollbar-button-state-normal
click clientX=0, clientY=0 » div#jqxScrollBtnDownverticalScrollBarjqxgrid.jqx-scrollbar-button-state-normal
…

This won’t stop until I click somewhere in the grid. Although no visual problems occur due to this it seems like invalid behavior to me.

Could you try to reproduce this behavior and let me know if you think this is a bug?

My real problem is that (in FF) when I drag the scrollbar (using the scrollbar button on the bar itself) and when I release the button (mouseup) it will continue scrolling (button stays ‘active’) all the way down. This does not happen in the sample so I’ll continue investigating that after I have some feedback on the behavior that I described above.

Thanks,

Ton

[Peter StoevKeymaster]

Hi Ton,

Note that while you debug by pressing additional buttons you may actually prevent the default mouse handling of your web page. When we test the Virtual Scrolling demo with FF – latest version and latest version of jQWidgets, the Mouse Up event of the scroll buttons is raised as expected – when we release the mouse inside or outside the Grid. By doing that the scroll button goes to normal mode.

Best Regards,
Peter Stoev

jQWidgets Team
http://www.jqwidgets.com/

[cosmicParticipant]

Wondering if Crunch (Ton) was able to resolve the issue with mouseup and scrollbars and if Peter can lend additional insight on what the issue could be. We have the same exact issue. We’ve implemented virtual scrolling and when making a wide scroll from top to bottom, the mouse appears to think it’s mousedown button is still pressed. When you move the mouse within the grid, it continues to move the scroll position. This appears to only happen in Firefox and not in IE.

[cosmicParticipant]

Hi Peter,

Can you look into this issue? I don’t know if it makes a difference, but I have the grid contained in a jqxsplitter panel and the scrollbar stays active when I make a wide ranging sweep of the scrollbar — but only with virtual scrolling. Smaller increments do not seem to trigger the issue. It’s very strange because it doesn’t happen with every wide sweep and occurs only in Firefox (v24.5.0). IE is fine. Thanks!

[Peter StoevKeymaster]

Hi cosmic,

No, we have not reproduced that and we have no work item about it as well.

Best Regards,
Peter Stoev

jQWidgets Team
http://www.jqwidgets.com/

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