Get the number of the active series in an active chart - excel

Question

I am trying to make a fairly easy macro to activate the next series in an already active chart. (my main macro contains all the formatting stuff).
Problem with this coding, is that i am not able to assign the current active series (already selected in the graph in excel). In a graph with n series (SeriesCollection.Count = n) I want to go from x, to x+1 and if x=n i want to go back to series 1 (so the for/next included here is not necessary if I get the macro to work as intended).
Sub NextButton_Click()
Dim cht As Chart
Set cht = ActiveChart
If cht Is Nothing Then
MsgBox "Select a chart."
Exit Sub
End If
With cht
For SrsIndx = 1 To .SeriesCollection.Count
.SeriesCollection(SrsIndx).Select
Next SrsIndx
End With
End Sub

Answer 1

For Simple graphs, just use PlotOrder: If you are not using a Combo Chart (i.e. not mixing Line and Bar charts, and not using the Secondary Axis), then you can just use the following code:
IIF(TypeName(Selection)="Series", Selection.PlotOrder, -1)
This will return -1 if you do not have a Series selected.
However, this is actually the order within the ChartGroup - the conditions above were for when there is only 1 ChartGroup on the Chart.
Otherwise, try using Name and a loop:
Function ActiveSeriesNumber(ThisSeries AS Series) AS Long
Dim ThisChart AS Chart, TestNumber AS Long
ActiveSeriesNumber = -1
On Error GoTo FunctionError
Set ThisChart = ThisSeries.Parent.Parent 'Object Model Is Chart.ChartGroup.Series
For TestNumber = 1 to ThisChart.SeriesCollection.Count
If ThisChart.SeriesCollection(TestNumber).Name = ThisSeries.Name THen
ActiveSeriesNumber = TestNumber
Exit Function
End If
Next TestNumber
FunctionError:
On Error GoTo -1
End Function
Use this by calling ActiveSeriesNumber(Selection)

Answer 2

Here's the General Idea. Step through that code and you can see each series gets selected. You'll need add some object validation as this assumes the selected object is a Series.
Sub CycleSeries()
Dim MyObject As ChartObject
Dim MyChart As Chart
Dim SerCol As SeriesCollection
Dim SelSeries As Series
Dim indexSeries As Series
Dim ChartSheet As Worksheet
Dim x As Integer
Set ChartSheet = ThisWorkbook.Sheets(1)
Set MyObject = ChartSheet.ChartObjects(1)
Set MyChart = MyObject.Chart
Set SerCol = MyChart.SeriesCollection
Set SelSeries = Excel.Application.Selection
For x = 1 To SerCol.Count
Set indexSeries = SerCol(x)
If indexSeries.Name = SelSeries.Name Then
If (x = SerCol.Count) Then
Set SelSeries = SerCol(1)
SelSeries.Select
Exit For
Else
Set SelSeries = SerCol(x + 1)
SelSeries.Select
Exit For
End If
End If
Next x
End Sub