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The foldering can be used to summarize data at different levels. In this example the invoice total is summarized per supplier and for the complete batch. You can find the script needed for the summarization below the figure showing a batch with two folders having each two documents.
During server processing the BeforeExtract and AfterExtract for each folder field and for each folder are fired. These events can be used analogously to the document processing for setting field values like in the following example: Summarizing the a specific document field of all documents in a folder and writing this sum to a folder field.
Private Sub SupplierTotal_BeforeExtract(pXFolder As CASCADELib.CscXFolder, pField As CASCADELib.CscXFolderField, pSkip As Boolean)
Dim i As Long
Dim dSupplierTotal As Double
For i = pXFolder.DocInfos.Count - 1 To 0 Step -1
dSupplierTotal = dSupplierTotal + pXFolder.DocInfos(i).XDocument.Fields.ItemByName("Total").DoubleValue
Next i
pField.Text = CStr(dSupplierTotal)
pField.ExtractionConfident = True
End SubDuring validation a different event is needed to keep this folder field up to date. Use the event AfterFieldConfirmed of the ValidationForm object to update the folder field data from the document data.
Private Sub ValidationForm_AfterFieldConfirmed(pXDoc As CASCADELib.CscXDocument, pField As CASCADELib.CscXDocField)
If pField.Name = "Total" Then
pXDoc.ParentFolder.Fields.ItemByName("SupplierTotal").Text = Format(RecalculateTotal(pXDoc),"#.###,00")
End If
End Sub
Private Function RecalculateTotal(pXDoc As CASCADELib.CscXDocument) As Double
Dim oXDocInfo As CASCADELib.CscXDocInfo
Dim n As Integer
RecalculateTotal = 0
For n = 0 To pXDoc.ParentFolder.DocInfos.Count - 1
Set oXDocInfo = pXDoc.ParentFolder.DocInfos(n)
RecalculateTotal = RecalculateTotal + oXDocInfo.XDocument.Fields.ItemByName("Total")
Next n
End Function