keyPressed trap

[jefargrafx]

how do you trap a key from performing it's action.

I have several fields on a form and I do not want the user to delete the field contents and process the form again.

if you delete the contents, and process the form serveal of my fields display NaN, I'll need to trap Delete, Space and Backspace...or in other words my textfield must contain numbers?

any ideas jef

 

[rgstewart]

Why not just insert some validation, instead of trapping keys? It'd be pretty useless trapping Delete and Backspace ... what happens if the user makes a mistake?!

Before the form is submitted, run each of the values through a validation function which checks to see if all values are numbers. If they are, submit the form. If not, point out the offenders and ask the user to rectify the mistake(s).