Subtract calculation in an expanding table?

Question

Hi
I am currently designing a form in Livecycle ES2 and am in need of calculation script.
I have an expanding table with add rows on it.
In the table i have a drop down list with 2 items that be can selected DR and CR, an Amount field and a total field.
Currently the Amount field and a totals field adds up correctly with this script Sum(Spersonaldetails2.Table1.Item[*].Amount)
However i now need the Totals field to calculate based on which item from the drop down is selected.
So if DR is selected i need it to add to the total and if CR is selected i need to subtract from the total.
One row could be a DR and the next row a CR.
I am unable to have the totals field subtract the Amount if CR is selected.
look forward to any help.  i have been wrecking my brain over this.

Answer 1

Hi,
A sumif equivalent in FormCalc could look like;
var totalRows = LoanProposal.Table1._Item.count
var groupTotal = 0
var list = ref(LoanProposal.Table1.resolveNodes("Item.[ItemName == ""Lodging""]"))
for i=0 upto list.length - 1 step 1 do
    groupTotal = groupTotal + list.item(i).Total
endfor
Note the totalRows variable is not used but is required so the calculate event knows to fire when a row is added or removed.
This would have to be repeated for each category so you might want to have a calculate event code at a higher level (like the LoanProposal subform) with some JavaScript code like;
// Reset all fields
xfa.host.resetData([Mileage.somExpression, Lodging.somExpression].join(","));
var rows = Table1.resolveNodes("Item[*]");
for (var i = 0; i < Table1._Item.count ; i++)
    var row = rows.item(i);
    switch (row.ItemName.rawValue)
        case "Mileage":
      Mileage.rawValue += row.Total.rawValue;
            break;
        case "Lodging":
      Lodging.rawValue += row.Total.rawValue;
            break;
I've only done the first two categories but you can see the pattern
Regards
Bruce