Sometimes you only want to enter numeric data in a textbox.
You have two options here :
Let a user type whatever he/she wants into a textbox, validate the input and show him or her an annoying message that he/she has done something wrong.:angry:
Or: capture the key before input, check if it's "numeric" and allow only "numerics" to come through. That way, you know the input is correct and you can proceed.:)
A decimal point should be correct input, but only once.
The next snippet does this and is easily adapted to allow for sientific input(+,-,e,E)