topic Re: listbox selection in LabVIEW

listbox selection

Nallez — Thu, 08 Feb 2007 11:57:22 GMT

Hi!

I have following problem with the listbox selection system:

I have to force the user after one selection of first two items to select other than the first two, BUT
when i select the new value from listbox, the "Mouse selection" stays behind and takes item from first two, which it should take it from.

First selection

LISTBOX:
Val1*Usable* <-select this with mouse
Val2*Usable*
Val3*Not Usable*
Val4*Not Usable*
Val5*Not Usable*

sets some values not usable and then sets the selection to 3rd item.

After first selection

LISTBOX:
Val1*Not Usable* <- gets value of this
Val2*Not Usable*
Val3*Usable* <- Highlights this
Val4*Usable*
Val5*Usable*

Any easy fix for this one?

Re: listbox selection

devchander — Thu, 08 Feb 2007 12:31:20 GMT

Use a property node of List box with its attributes set to disabled items.

The items at those indices ( specified by disabled items array) shall be disabled on your listbox control

look at attached pic

Re: listbox selection

Nallez — Sun, 11 Feb 2007 08:54:43 GMT

@devchander wrote:

Use a property node of List box with its attributes set to disabled items.

The items at those indices ( specified by disabled items array) shall be disabled on your listbox control

look at attached pic

Yes. I have disabled them just like in your picture there, but the last selection with mouse still holds the value rather than the selection i made programatically!
It still selects the disabled item and i consider this a BUG in the program.

Re: listbox selection

devchander — Wed, 14 Feb 2007 08:41:11 GMT

Could you please attach the program that you have built.

Probably we could take a look at it and suggest better

Re: listbox selection

Ben — Wed, 14 Feb 2007 14:20:23 GMT

I have to second Dev's request for code that illustrates this behaviour. We do much better at answering Q's when we have code to look at.

We will jump on a bug like a prey mantis once we can see it.

Ben

Re: listbox selection

Nallez — Wed, 21 Feb 2007 13:09:55 GMT

Phase1:
I have only 2 selections to choose from, I choose one of them and press "Lisää Lohko", which means "Add Block".
http://img57.imageshack.us/img57/3609/phase1fj3.png

Phase2:
The selection copied to the left listbox. Then program disables the first 2 selections, so you cant select more than 1 of them.
http://img214.imageshack.us/img214/9505/phase2bx2.png

Phase3:
I just click the "Lisää Lohko"- button, which adds item from the list, but none is selected and it still adds the first item!
Even if i select programatically the 3rd item from the selection list, it still adds the first item if i dont push it with a mouse.
http://img341.imageshack.us/img341/3226/phase3dy5.png

Message Edited by Nallez on 02-21-2007 07:11 AM

Re: listbox selection

Nallez — Wed, 21 Feb 2007 13:19:04 GMT

LOHKOLISTA-listbox disabling code:

Phase1 Code for disabling:
http://img64.imageshack.us/img64/952/noitemsgb7.png

Phase2 Code for disabling is similar, but with only [0,1] on the array.

Message Edited by Nallez on 02-21-2007 07:20 AM

Re: listbox selection

Nallez — Thu, 22 Feb 2007 07:19:27 GMT

Re: listbox selection

becktho — Thu, 22 Feb 2007 07:50:11 GMT

Hi Nallez

One question - why don't you use two different listboxes? In my opinion it is not so userfriendly to enable and disable values of a listbox according to a selection in this listbox.

If you use two listboxes, you can fill the second one with values depending on the selection made in the first one. After performing this selection, you could disable the first listbox, fill the second one and enable it.

Re: listbox selection

Nallez — Thu, 22 Feb 2007 10:10:14 GMT

@becktho wrote:

Hi Nallez

One question - why don't you use two different listboxes? In my opinion it is not so userfriendly to enable and disable values of a listbox according to a selection in this listbox.

If you use two listboxes, you can fill the second one with values depending on the selection made in the first one. After performing this selection, you could disable the first listbox, fill the second one and enable it.

Because the customer wants it that way.

If customer wants -> he gets.

Re: listbox selection

becktho — Thu, 22 Feb 2007 10:15:07 GMT

Ok - forget what I said (at least for this project) ;).

Re: listbox selection

Nallez — Thu, 22 Feb 2007 12:45:36 GMT

up ^

Re: listbox selection

Nallez — Fri, 23 Feb 2007 06:45:00 GMT

no one knows any solution to this ?

Re: listbox selection

becktho — Fri, 23 Feb 2007 07:12:19 GMT

Hi Nallez

I think this is what you are looking for..

Re: listbox selection

Nallez — Fri, 23 Feb 2007 07:20:03 GMT

problem solved.

value (signaling) did it for me.

Too many hours of work 😄

Re: listbox selection

becktho — Fri, 23 Feb 2007 07:24:21 GMT

Just in case you don't know it yet:

The property value simply changes the value of a control (without generating an event).

The property value (signaling) also changes the value of a control, but also generates an event. So if you have an event-structure with the event "Control": Value Change, this frame will be executed. As if you changed the value of the control via user interface.

Re: listbox selection

Nallez — Fri, 23 Feb 2007 07:39:22 GMT

yep. i read the help-info about it and had an moment of light 😄