JavaScript Tip

Javascript to accept only numbers:

var isNS4 = (navigator.appName=="Netscape")?1:0;

<textarea rows=2 cols=20 name=comments onKeypress="if(!isNS4){if ((event.keyCode > 32 && event.keyCode < 48) || (event.keyCode > 57 && event.keyCode < 65) || (event.keyCode > 90 && event.keyCode < 97)) event.returnValue = false;}else{if ((event.which > 32 && event.which < 48) || ( event.which > 57 && event.which < 65) || (event.which > 90 && event.which < 97)) return false;}"></textarea>


ASCII values for keys:

numpad
  DOT/DECIMAL  ('.') : 110
  NUMBERS:  0 - 9 =  96 - 105

KEYBOARD
DOT/DECIMAL/PERIOD  ('.') :  190
NUMBERS:   0 - 9 = 48 - 57