I needed some help on how to add Validation on text boxes. I wanted validation such as only adding numbers, or max 7 characters for postcode, etc.
I wanted a validation on postcode so that if the correct format doesn't appear (ex, LE5 7LD) then a message box would come up saying format incorrect or something.
I also needed help on making sure a text box is not left blank, and if it is, a error comes up when "Submit" is clicked?
I've tried googline, but couldnt find nothing similar.