How Can We Help?
Add the following JavaScript function to your HTML page
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}The above function checks the input of the user and then returns false if no number has been entered and true if a number has been entered
Then in your textfield HTML code add the following
onkeypress="return isNumberKey(event)"This will check for a number on every key press from the user
<input type="text" onkeypress="return isNumberKey(event)" name="number" />