Update numeric while typing

[elset191]

I saw a few old posts about this topic with some workarounds, but neither really works in my case.  I have a popup with a min and max field, and a return button.  The button gets disabled when min is >= max.  The problem is when I start typing in a valid value the return button doesn't enable until I'm done, which blocks me from using the enter button to exit the vi.  Please see the attachment for a clearer explanation.

[smercurio_fc]

Which workarounds in those posts have you tried? The most common one that I know of is to use the Input Device Control VIs to capture keyboard presses and to see which control has focus. You capture the keys, and store them in a buffer to emulate what the control has, and you can make decisions based on this.

[elset191]

I hadn't tried any of them, but the descriptions didn't fit with the enter key like I was trying to use it.

Anyway, I came up with the attached workaround, using key down events.  It seems to work so far as I've tested

[billko]

Sorry, I have an older version of LabVIEW so I cannot see your VI.  Is it possible to include an event in your event structure for the numeric control that enables the return button on a key press?  (I guess either key up or down, but convention says "up.")

[smercurio_fc]

Sorry, when you said "old posts" I thought you meant like really old, like before event structures. God, am I really getting old?

By the way, in your specific case you don't need to check the error clusters. The error out for the Scan From String is useful if the format string is programmatically created (which you're not doing). The function will tell you if there's a problem with format string by generating an error.

[billko]

Late by a few minutes.  😉

[elset191]

No, I think I need them.  For example, if you have -3 and press delete you will be left with -.  This will throw an error.  So in that case, I keep the OK button disabled using the error cluster.

Message Edited by elset191 on 08-04-2009 02:12 PM

[RafP]

I posted my solution to this problem here

Check it out. Hope it helps.