js that adds up form fields to achieve grand total?

[finchuck]

Hello,

I'm looking for a simple javascript that will just take the fields in a form, add them up automatically as you enter them and place them in a grand total field at the bottom. I have ABSOLUTELY no knowledge of js, except how to take a script and put it on the page.

I designed this page for its use, so you can see how it will be applied (the approximate balance due column):
www.corporateturnaround.com/worksheet_test/

Another concern I have is the $ signs and possibly commas, as users may or may not use them. Does anybody know of any script that may be useful here?

Thanks,
Robert

[acoder]

Assuming that the ID of the total field is "total":

window.onload=function() {
  inputs = document.getElementsByTagName("input");
  for (i = 0; i < inputs.length; i++) {
    if (inputs[i].id != "total") {
      inputs[i].onchange = addTotal;
    }
  }
}
function addTotal()
{
  var total =0.0;
  var fields = document.getElementsByTagName("input");
  for (i = 0; i < fields.length; i++) {
    // assuming only text fields
    if (fields[i].id != "total") {
      var val = parseFloat(fields[i].value);
      total += isNaN(val)?0.0:val;
    }
  }
  document.getElementById("total").value= total;
}