JavaScript Function Allow Number keys Only (only digit)

This function returns True if the passed keycode is a digit, False if it is not. This is useful when you want to limit the values of a input field to only numbers.

function isDigit(nKeyCode)

{

	// Test for digit keycode (0-9).

   if((nKeyCode > 47) && (nKeyCode <  58))

   {

      return true;

   }

   

   return false;

}

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