URL: http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=1907&lngWId=2
/* —————————————————————- AllowOnly: This function allow entering just the specified Expression to a textbox or textarea control. Parameters: Expression = Allowed characters. a..z => ONLY LETTERS 0..9 => ONLY NUMBERS other symbols… Example: use the onKeyPress event to make this function work: //Allows only from A to Z onKeyPress="AllowOnly('a..z');" //Allows only from 0 to 9 onKeyPress="AllowOnly('0..9');" //Allows only A,B,C,1,2 and 3 onKeyPress="AllowOnly('abc123');" //Allows only A TO Z,@,#,$ and % onKeyPress="AllowOnly('a..z|@#$%');" //Allows only A,B,C,0 TO 9,.,,,+ and - onKeyPress="AllowOnly('ABC|0..9|.,+-');" Remarks: Use the pipe "|" symbol to separate a..z from 0..9 and symbols Returns: None —————————————————————- */ function AllowOnly(Expression) { Expression = Expression.toLowerCase(); Expression = Replace(Expression, 'a..z', 'abcdefghijklmnopqrstuvwxyz'); Expression = Replace(Expression, '0..9', '0123456789'); Expression = Replace(Expression, '|', ''); var ch = String.fromCharCode(window.event.keyCode); ch = ch.toLowerCase(); Expression = Expression.toLowerCase(); var a = Expression.indexOf(ch); if (a == -1) window.event.keyCode = 0; }
