How To Only Allow Alpha Numeric Chars With JavaScript

Question

Been playing around with JavaScript, and what Im trying to do is only allow certain characters in the pass word field - a-z, A-Z and 0-9.

Answer 1

You need to make your condition test a regexp, not a string:

if(!/^[a-zA-Z0-9]+$/.test(name)){ ...

meaning:

• ^ -- start of line
• [a-zA-Z0-9]+ -- one or more characters/numbers
• $ -- end of line

or you could search for the inverse of that, which is "any non-accepted character":

if(/[^a-zA-Z0-9]/.test(name)){