Disabling Keys

[Arg81]

Hi All,

I've got a function that stops users pressing certain keys within a textbox.

Has someone got a list or a website that shows the numeric value of each key? I.E / = 47 \ = 92 etc.

Either that, or does anyone know the best way of setting a textbox so only numbers can be entered - no symbols or letters allowed.

cheers!
Luke

 

[JuggaloBrotha]

in the keypress event check to see if the key is numeric:

If IsNumeric(e.KeyChar) = False Then e.Handled = True

the above line checks to see if it's a number or not, and if it's not then it's not passed to the textbox

 

[Arg81]

Hey JB,

Cheers for that mate, working perfectly.

Luke

 

[jmcilhinney]

It is not quite such a trivial matter to exclude non-numeric characters. Using that code does not prevent the user pasting whatever they want into the control. You can handle the Ctrl+V combination in the KeyDown event and you can also disable the standard ContextMenu by assigning a blank one. If you don't mind using third party controls, you can get a relatively sophisticated numeric TextBox from here. This library contains many other useful components as well. If you have doubts that the library is free (as many I've referred do) read the page carefully and you'll see that it is not a 30 day trial as some believe.

 

[Arg81]

hey jm,

Thanks for the tip, but I only want the "numeric textbox" for the user to enter an ID number to search on.
I've got it all validating if the ID is not found, however if a string was entered I'd get the "input string not correct" error.
I doubt very much they would try to copy and paste something - they're not that clever. It was a case of either do this project in VB.net, or give them crayons and some scrap paper.....

cheers
Luke

 

[kulrom]

they're not that clever ??? I would not say that

 

[Arg81]

honest.
They struggle telling their ar*e from their elbow.

I've had to write the documentation for the use of this project in the form of a pop-up book so they understand - too much text will confuse and bore them, I need to keep their minds focused, so will use pictures and pop ups instead.

...and I bet some people won't believe me on this!!!!!