Combo Box

[Novatronics]

How how do I get the text of the item in a Combo Box and the index of the item while scrolling through each item using the arrow up or down key.

I have created a event structure on key press but had know success.

Attached is my example.


Thanks,
Paul

[LV_Pro]

I don't see any way to detect the "selection" as you're scrolling as it hasn't registered as a change or selection until you press enter or click outside the combo box. To get the index of the selection I just output the strings[] and search for the match (see attached)

P.M.

[ian_fung]

Please find attached VI for your reference and hope you will find it useful.

[LV_Pro]

See what happens when you get so wrapped up in the newer "tools"? Remove the "event structure" and Bang! there is the answer. Thanks Ian.


P.M.

[Novatronics]

Thank you for all your inputs. The ideas are great unfortunately they will not work in my application because I will have duplicate items. I am filling the combo box with all the available test results of a particular unit from a database and in the event of a retest the serial number that goes in the combo box may repeat. I was hoping the operator could scroll through the serial numbers and in real time I would update the test date, operator and description beside the combo box. In Visual basic this was extremely simple (see below).

Private Sub Combo1_Click()
Label1.Caption = Combo1.Text
Label2.Caption = Combo1.ListIndex
End Sub

Private Sub Form_Load()
Combo1.AddItem "one"
Combo1.AddItem "two"
Combo1.AddItem "two"
Combo1.AddItem "four"
End Sub

I have programmed in VB for 10 years and am very use to the event driven language and was hoping labview would have similar functionality without tying up resources.

I appreaciate all the support that I have been given from this form as I make the transition into this LabView graphical programing.

Thanks,
Paul

[ian_fung]

🙂 Thanks to you too, P.M! Cheers!

[altenbach]

Maybe a Combo box is not what you need! 🙂 (I don't like combo boxes!)

Personally, I'd use a listbox. It's much easier on the operator and works just fine for this purpose. See attached.

[Novatronics]

Thank you for all the suggestions. I have just finished what I am trying to accomplish using a table and the event structure. It is not as nice as some stuff I have done in VB but it will due.

Thanks again for all the ideas.
Paul

[ian_fung]

Any changes for us to share your accomplishment? No obligation, however 🙂

Cheers!

[Novatronics]

I have attached my work around to show the basis of what I am doing. I have saved data in the table since the database is not available.

You will notice as you click on a table item the test identifier is given as well you can scroll through the data with the up/down arrow keys. All actions are event driven therefore not tying up resources.

A neater version of this VI will be called up from the main program and the operator will have the ability to reload data.

Thanks for all the help,
Paul