restrict a character to type in a text box

Question

how we can restrict a character to type in a text box.

Answer 1

If you have the text box then you have to handle the onkeypress event

You can use the following function to restrict the users

    function keypresshandler(event)
    {
         var charCode = event.keyCode;
         //Non-numeric character range
         if (charCode > 31 && (charCode < 48 || charCode > 57))
         return false;
    }