Allow only specific characters

Question

I would like to block the input of all characters except 0-9, az, AZ, only alphanumeric characters. Therefore, when someone dials! for example, nothing is written to the input. How can i do this?

Answer 1

You need to write a function that listens onkeypressfor the event for the form field, then check to see if the form contains any unwanted characters, and if that happens, you will update the field to remove those characters.

Answer 2

Or maybe you can use the Alphanumeric plugin for jQuery :

$('#yourInput').alphanum();