Sum the values of a text field in a tabular form using JavaScript

Hi Folks.
OK, I put my hands up. I don't know Java script but I'm picking up the basics and I WANT to learn.
Here's my situation.
I have a tabular form which has lots of Standard Report Columns and ONE text field.
I want to sum the values entered in the text field, real time, using Java Script without the need to have a round trip to the database.
I'm guessing this will involve some kind of loop. Once I have that SUM figure I will store it in a hidden item and it will be used for validation when the user submits the form.
If anyone can give me a simple Java Script to do this, or point me in the direction of one, I'd be very grateful.
Many thanks.
Dogfighter.

Hi Arie.
Thanks for the link.
That's a great start,
What I've got working so far is the following...
<script type="text/javascript">
function f_calculate_delta(p_this,p_rownum)
var amt = $x(p_this).value;
alert (amt);
var display_item_to_set = 'f08_'+ p_rownum
$x(display_item_to_set).innerHTML = amt
</script>
This is working fine.
Where I'm stuck at the moment is how I can 'get' the value of another cell in the same row. They have all been set up using the APEX_ITEM API with their own unique IDs.
I will continue looking but if you could give me a steer, that would be great.
Many thanks
Simon
PS. APEX 3.1
PPS. Trying to get the value of another row using...
var display_item_to_get = 'f04_'+ p_rownum
var expected_amt = $x(display_item_to_get).value
PPPS. Also tried...
var display_item_to_get = 'f04_'+ p_rownum
var expected_amt = $v(display_item_to_get)
and
var display_item_to_get = 'f04_'+ p_rownum
var expected_amt = $v(display_item_to_get).value
None of which are working at the moment.
Message was edited by:
Dogfighter

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