Question

Alpha Numeric problem in Javascript..?
I Have a textbox and I need this textbox to do the following:

1] First one should be character followed by number [eg A1234]
2]No letter should be typed after the first character.
3]No space should be provided between the character & number.

Answer 1

What you need to use is regular expressions in Javascript. You can learn more abt it at http://www.w3schools.com/jsref/jsref_obj_regexp.asp

Answer 2

thanx

Answer 3

we can do it only with the help of regular expressions
var re=new RegExp("[a-zA-Z][0-9\.]{1","g");
try this

Answer 4

ther's a mistake
var re=new RegExp("[a-zA-Z][0-9\.]{1}","g");

Answer 5

Wouldn't:
var re = new RegExp( "[A-Za-z][0-9]+", "g" );
or:
var re = new RegExp( "[A-Za-z][0-9]{4}", "g" );

do it?