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

The below solution will accept only the alpha numeric value and some special key like backspace, delete etc.

If you want to add some other key then add to the array .

If you want to add some special symbol add to the same array or create a new array and compare it on the function like ex: yourNewVariableName.indexOf(e.keyCode)

var specialKeys = [8, 9, 46, 36, 35, 37, 39];
        function IsAlphaNumeric(e) {
            var keyCode = e.keyCode == 0 ? e.charCode : e.keyCode;
            var ret = ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122) || (specialKeys.indexOf(e.keyCode) != -1 && e.charCode != e.keyCode));
            return ret;
        }

Alphanumeric value: