[Javascript] Adding values in input boxes

[Scott Reynen]

On Jun 1, 2006, at 8:41 AM, Alan Easton wrote:

> I simply want to be able to add up the 3 boxes when any of them  
> change, but also catch when nothing has been entered.i.e. when the  
> value is undefined.

What do you want to happen when you catch undefined values?  I do  
this in an auto-adding page:

valueOne = parseFloat( inputField.value );
if ( isNaN( valueOne ) ) valueOne = 0;

Peace,
Scott