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Accept only numbers in a text field (See related posts)

Check user's input and allow numbers only (allowed characters list could be changed in the source).
The second parameter of "numbersonly" function allow to define if decimal numbers are allowed.

JavaScript code:
function numbersonly(e, decimal) {
var key;
var keychar;

if (window.event) {
   key = window.event.keyCode;
}
else if (e) {
   key = e.which;
}
else {
   return true;
}
keychar = String.fromCharCode(key);

if ((key==null) || (key==0) || (key==8) ||  (key==9) || (key==13) || (key==27) ) {
   return true;
}
else if ((("0123456789").indexOf(keychar) > -1)) {
   return true;
}
else if (decimal && (keychar == ".")) { 
  return true;
}
else
   return false;
}


HTML code:
<form>
  <input name="number"  onKeyPress="return numbersonly(event, false)">
</form>
to javascript by marco on Thu Mar 13 07:10:15 -0400 2008

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