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Question About KeyUp and ListBoxes

Posted on 2009-04-13
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Last Modified: 2013-11-28
I have a list box that is being monitored for key events.  When I tab to the list box I can use the arrow keys to select a record.  With a record selected, I want to trigger an action when the Return key is pushed.  The event does not fire on the first push; it fires on the second.  Why is this?

Mike

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Question by:shacho
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8 Comments
 
LVL 75

Assisted Solution

by:DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform)
DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform) earned 1200 total points
ID: 24134513
why not use KeyDown ?

mx
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LVL 75
ID: 24134543
Why are you using the Return key in the List box?
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Author Comment

by:shacho
ID: 24134907
>why not use KeyDown ?
Tried KeyDown.  It works.  But why should KeyDown work on the first Enter and not KeyUp?
I chose KeyUp because I figured it was good policy to run code after key events were concluded
and KeyUp should logically run after KeyDown.

>Why are you using the Return key in the List box?
The listbox is a search results list.  I want people who prefer to use the keyboard over the mouse
to be able to launch the viewer for the selected record with the Return key in case they don't want
to double-click.

Mike
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LVL 75

Accepted Solution

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DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform) earned 1200 total points
ID: 24134935
Not sure why Key Down works over Key Up ... but it's still a valid event ... and for most applications I can think of, that is what I use. Actually on my test for, Key Up works on the first time.  However ... if nothing is selected and I tab into the list box ... and hit down arrow ... it selects the first item ... and so on.  BUT ... if I hit Enter at any time ... it goes to the next control in the tab order!

mx
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LVL 65

Assisted Solution

by:rockiroads
rockiroads earned 800 total points
ID: 24135272
the difference I thought was

keydown - user presses a key
keyup - user releases a key

so explains why keydown gets called first, as you have concluded yourself.

But it doesnt need two pushes, unless maybe you have caught it elsewhere first?
Have you a form capture event?

I for one prefer the use of keypress but thats not going to answer your question now is it, lol.
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LVL 75

Assisted Solution

by:DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform)
DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform) earned 1200 total points
ID: 24135282
However ... Keypress does not catch all codes ...

Yes ... sure, that is the difference between the two ...

mx
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LVL 65

Assisted Solution

by:rockiroads
rockiroads earned 800 total points
ID: 24135318
no, though it does catch return key but if you want to catch the use of shift, ctrl etc then you have to use the other key events.
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Author Comment

by:shacho
ID: 24165021
Well, I'm gonna chalk it up to plain old bugginess because I think KeyUp should work.  Thanks for your suggestions.

Cheers,

Mike
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