Custom Field text input

[Kate7]

Hi
I am wanting to make a custom field where you can restrict how many characters a personal message for a book can be.

I have made a custom field using a plug-in then selecting VM Custom - Customer text input then I select size of the input to 30 then I have tried both options price per letter and per input. When I test this it lets me exceed 30 characters - why is this?

[Jörgen]

I guess size of input is the size of the input box, if am I right, not the length of the text. Have you looked at the original code, is there perhaps a check already ?  The ask a question has a check for size of input text, check that out and see how it is done.

Jörgen