/*
JavaScript Bible, Fourth Edition
by Danny Goodman
John Wiley & Sons CopyRight 2001
*/
Letting Only Numbers Pass to a Form Field
function checkIt(evt) {
evt = (evt) ? evt : window.event
var charCode = (evt.which) ? evt.which : evt.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57)) {
status = "This field accepts numbers only."
return false
}
status = ""
return true
}
Letting Only Numbers Pass to a Form Field
Enter any positive integer: