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How to limit drop down list size/direction

Created on: Feb 18, 2009 8:47 PM

Created by: Rob J

Hi,

With regards to a Select/Combo (jsx3.gui.Select), is it possible to either limit the size (number or items visible before scrolling) or the drop down list position? When I have more then a certain number of values in the list the drop-down list actually drops "up" and is drawn above the combo/select box. My preference is for the list to always appear below the input box.

Is there some option I can specify so that it always tries to draw the drop-down box below the select control instead of above it? Alternatively is it at least possible to do something like specifying that you want it to try and draw n items below the input box before falling back to drawing the list above the input box?

At the moment the behaviour seems to be to draw the select list below the input box if the list is small enough (and would not need to be scrolled) otherwise draw the list above (even if it would need to be scrolled).

Rob

Tags: gi, select, drop_down

michael peachey

743 posts since
Oct 24, 2008

1. Feb 18, 2009 9:16 PM

in response to: Rob J

Re: How to limit drop down list size/direction

Hi Rob -

Rereading your post, it seems clear that you've got a good handle on the current behavior, with just the additional adjustment that the intent is to show scrollbars with the control on top, only if it would display *more* of the control than showing the scrollbars on the bottom.

The intent is to anticipate whatver might happen in a dynamic liquid layout at runtime, and present the user with as much of the control as possible.But, I can certainly see your use case as well.

Are you working with the open source edition? If so, the mod for what you need would be pretty straightforward to pick out of the code. Let us know if you'd like a pointer.

peachey

Rob J

6 posts since
Dec 23, 2008

2. Feb 18, 2009 9:18 PM

in response to: michael peachey

Re: How to limit drop down list size/direction

Hi,

Yep there is plenty of room above and below the input box. If I move the Select box up the screen a bit it will render the drop down box below, if I move it down a bit the drop down box is above the. Either way, its fitting approximately 20-21 items in the list and is drawing a scroll bar.

So it looks like it could fit say 18 rows below the input box or maybe 20 rows above and it choose to go above. There are probably 30-40 items in the list so whichever way it goes (up or down) it needs to scroll. The logic seems to be: if unable to draw the box below without fitting at least 20 items in it, then draw the box above the input box.

I was hoping there was an option where you could tell it to try and draw (for example) 10 items below, if that wont fit, then go above.

- Rob

Rob J

6 posts since
Dec 23, 2008

3. Feb 18, 2009 9:23 PM

in response to: Rob J

Re: How to limit drop down list size/direction

Hi Michael,

Thanks for the quick updates on the forums!

Yes, I would appreciate it if you could point me in the right direction with what to update to change the behaviour of the select's drop-down list to do what I am trying to get it to do. (draw below if n items fit, otherwise draw above).

Thanks,
Rob

michael peachey

743 posts since
Oct 24, 2008

4. Feb 18, 2009 9:24 PM

in response to: Rob J

Re: How to limit drop down list size/direction

Yes, that would be cool.

Not a hard change, if you want to give it a shot we could think about rolling it into the supported product. Alternately, you could file an enhancement request in the Jira tracking system at gi.tibco.com, but it might not get much traction.

peachey

Jesse Costello-Good

836 posts since
Oct 24, 2008

5. Feb 19, 2009 11:49 AM

in response to: Rob J

Re: How to limit drop down list size/direction

Hi Rob,

The easiest way to prevent the Select from opening above the control is to delete this line in Select.js:

objHW.addYRule(objGUI,"N","S",0);

All the logic in Heavyweight.js is geared towards filling the direction that affords the most space. I think adding more fine-grained rules to that class would be very difficult.

Another option that would work in Firefox is to edit the .jsx30select_optionlist class in the CSS files and add a max-height.

Jesse

Darren Hwang

1,397 posts since
Aug 6, 2008

6. Feb 19, 2009 7:19 PM

in response to: Rob J

Re: How to limit drop down list size/direction

Hi Robert,

We appreciate your feedback and help. Let me know if you have trouble modifying Select.js code logic as Jesse said.

Anyway, doing your own build with GI is very simple.

You can download the source package (tibco-gi-3.7.0-src.zip) from http://gi.tibco.com

Assuming that you have Ant installed, simply go to the build/ directory. You will find the Ant build.xml file there. Simply type "ant" to start the build.

:D

Darren Hwang

1,397 posts since
Aug 6, 2008

7. Feb 19, 2009 7:57 PM

in response to: Rob J

Re: How to limit drop down list size/direction

Please also submit an enhancement request on JIRA (http://gi.tibco.com/jira) With sufficient vote, we'll consider it for future release. ( have your friends vote for it. :)

Katie

290 posts since
Oct 24, 2008

8. Apr 27, 2009 2:06 PM

in response to: Darren Hwang

Re: How to limit drop down list size/direction

I and the customers using my product would definitely appreciate this enhancement. I'm going to go search for a JIRA bug and vote for it!

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