VBA: Modify chart data range - excel

Question

My "Chart data range" is ='sheet1'!$A$1:$Z$10. I'd like to make a VBA macro (or if anybody knows a formula I can use, but I couldn't figure one out) to increase the ending column of the range for chart1 by 1 every time I run the macro. So essentially:
chart1.endCol = chart1.endCol + 1
What is the syntax for this using ActiveChart or is there a better way?

Answer 1

Offset function dynamic range makes it possible.
Sample data
Steps
Define a dynamic named range
=OFFSET(Sheet1!$A$2,,,1,COUNTA(Sheet1!$A$2:$Z$2)) and give it a
name mobileRange
Right Click on Chart
Click on Select Data
This screen will come
Click on Edit under Legend Entries.(mobiles is selected)
change the Series value to point to mobileRange named range.
Now if data for future months are added to mobile sales it will automatically reflect in chart.

Answer 2

Assuming that you want to expand the range (by adding one extra column) to add one more observation for each series in you diagram (and not to add a new series), you could use this code:
Sub ChangeChartRange()
Dim i As Integer, r As Integer, n As Integer, p1 As Integer, p2 As Integer, p3 As Integer
Dim rng As Range
Dim ax As Range
'Cycles through each series
For n = 1 To ActiveChart.SeriesCollection.Count Step 1
r = 0
'Finds the current range of the series and the axis
For i = 1 To Len(ActiveChart.SeriesCollection(n).Formula) Step 1
If Mid(ActiveChart.SeriesCollection(n).Formula, i, 1) = "," Then
r = r + 1
If r = 1 Then p1 = i + 1
If r = 2 Then p2 = i
If r = 3 Then p3 = i
End If
Next i
'Defines new range
Set rng = Range(Mid(ActiveChart.SeriesCollection(n).Formula, p2 + 1, p3 - p2 - 1))
Set rng = Range(rng, rng.Offset(0, 1))
'Sets new range for each series
ActiveChart.SeriesCollection(n).Values = rng
'Updates axis
Set ax = Range(Mid(ActiveChart.SeriesCollection(n).Formula, p1, p2 - p1))
Set ax = Range(ax, ax.Offset(0, 1))
ActiveChart.SeriesCollection(n).XValues = ax
Next n
End Sub

Answer 3

Assuming that you only run the macro with a Chart Selected, my idea is to alter the range in the formula for each Series. You can of cause change to apply to all Charts in a Worksheet.
UPDATE: Have changed code to accommodate multiple series with screenshots
Formatting of new series string needs to include apostrophes around the worksheet name (already changed below): aFormulaNew(i) = "'" & oRng.Worksheet.Name & "'" & "!" & oRng.Address. Also, if looking to change rows rather than columns, change the offset to Set oRng = oRng.Worksheet.Range(oRng, oRng.Offset(1, 0)) or as needed. Can also include oRng.Offset(1, 0) for the first element in the range to adjust the start position of the series: Set oRng = oRng.Worksheet.Range(oRng.Offset(1, 0), oRng.Offset(1, 0))
Sub ChartRangeAdd()
On Error Resume Next
Dim oCht As Chart, aFormulaOld As Variant, aFormulaNew As Variant
Dim i As Long, s As Long
Dim oRng As Range, sTmp As String, sBase As String
Set oCht = ActiveSheet.ChartObjects(1).Chart
oCht.Select
For s = 1 To oCht.SeriesCollection.count
sTmp = oCht.SeriesCollection(s).Formula
sBase = Split(sTmp, "(")(0) & "(<FORMULA>)" ' "=SERIES(" & "<FORMULA>)"
sTmp = Split(sTmp, "(")(1) ' "..., ..., ...)"
aFormulaOld = Split(Left(sTmp, Len(sTmp) - 1), ",") ' "..., ..., ..."
aFormulaNew = Array()
ReDim aFormulaNew(UBound(aFormulaOld))
' Process all series in the formula
For i = 0 To UBound(aFormulaOld)
Set oRng = Range(aFormulaOld(i))
' Attempt to put the value into Range, keep the same if it's not valid Range
If Err.Number = 0 Then
Set oRng = oRng.Worksheet.Range(oRng, oRng.Offset(0, 1))
aFormulaNew(i) = "'" & oRng.Worksheet.Name & "'" & "!" & oRng.Address
Else
aFormulaNew(i) = aFormulaOld(i)
Err.Clear
End If
Next i
sTmp = Replace(sBase, "<FORMULA>", Join(aFormulaNew, ","))
Debug.Print "Series(" & s & ") from """ & oCht.SeriesCollection(s).Formula & """ to """ & sTmp & """"
oCht.SeriesCollection(s).Formula = sTmp
sTmp = ""
Next s
Set oCht = Nothing
End Sub
Sample data - Initial
After first run:
Second Run:
Third Run:

Answer 4

PatricK's answer works great with some minor adjustments:
Formatting of new series string needs to include apostrophes around the worksheet name on line 22 aFormulaNew(i) = "'" & oRng.Worksheet.Name & "'" & "!" & oRng.Address. Also, if looking to change rows rather than columns, change the offset on line 21 to Set oRng = oRng.Worksheet.Range(oRng, oRng.Offset(1, 0)) or as needed. Can also include oRng.Offset(1, 0) for the first element in the range to adjust the start position of the series: Set oRng = oRng.Worksheet.Range(oRng.Offset(1, 0), oRng.Offset(1, 0))
Sub ChartRangeAdd()
On Error Resume Next
Dim oCht As Chart, aFormulaOld As Variant, aFormulaNew As Variant
Dim i As Long, s As Long
Dim oRng As Range, sTmp As String, sBase As String
Set oCht = ActiveSheet.ChartObjects(1).Chart
oCht.Select
For s = 1 To oCht.SeriesCollection.count
sTmp = oCht.SeriesCollection(s).Formula
sBase = Split(sTmp, "(")(0) & "(<FORMULA>)" ' "=SERIES(" & "<FORMULA>)"
sTmp = Split(sTmp, "(")(1) ' "..., ..., ...)"
aFormulaOld = Split(Left(sTmp, Len(sTmp) - 1), ",") ' "..., ..., ..."
aFormulaNew = Array()
ReDim aFormulaNew(UBound(aFormulaOld))
' Process all series in the formula
For i = 0 To UBound(aFormulaOld)
Set oRng = Range(aFormulaOld(i))
' Attempt to put the value into Range, keep the same if it's not valid Range
If Err.Number = 0 Then
Set oRng = oRng.Worksheet.Range(oRng, oRng.Offset(0, 1))
aFormulaNew(i) = "'" & oRng.Worksheet.Name & "'" & "!" & oRng.Address
Else
aFormulaNew(i) = aFormulaOld(i)
Err.Clear
End If
Next i
sTmp = Replace(sBase, "<FORMULA>", Join(aFormulaNew, ","))
Debug.Print "Series(" & s & ") from """ & oCht.SeriesCollection(s).Formula & """ to """ & sTmp & """"
oCht.SeriesCollection(s).Formula = sTmp
sTmp = ""
Next s
Set oCht = Nothing
End Sub

Answer 5

PatricK and sirbedevire got me started with this fairly well. Now, I'm trying to consolidate it into a separate sub I can reference to process multiple charts. Unfortunately, I'm missing something in the referencing so it's not making the updates (and not producing an error).
1st sub using 2nd sub
If ws < numTabs - 1 Then
chartUpdate Summary, Chart_BidsByMonth ' Name of sheet with target chart, Name of target chart
chartUpdate Summary, Chart_SoldByMonth ' Name of sheet with target chart, Name of target chart
End If
2nd sub processing chart range update
Sub chartUpdate(shtRef As Variant, chtRef As Variant)
On Error Resume Next
Dim oCht As Chart, aFormulaOld As Variant, aFormulaNew As Variant
Dim n As Long, s As Long
Dim oRng As Range, sTmp As String, sBase As String
' Update chart referenced as chtRef '
Set oCht = Sheets(""" & shtRef & """).ChartObjects(""" & chtRef """).Chart
oCht.Select
For s = 1 To oCht.SeriesCollection.Count
sTmp = oCht.SeriesCollection(s).Formula
sBase = Split(sTmp, "(")(0) & "(<FORMULA>)" ' "=SERIES(" & "<FORMULA>)"
sTmp = Split(sTmp, "(")(1) ' "..., ..., ...)"
aFormulaOld = Split(Left(sTmp, Len(sTmp) - 1), ",") ' "..., ..., ..."
aFormulaNew = Array()
ReDim aFormulaNew(UBound(aFormulaOld))
' Process all series in the formula
For n = 0 To UBound(aFormulaOld)
Set oRng = Range(aFormulaOld(n))
' Attempt to put the value into Range, keep the same if it's not valid Range
If Err.Number = 0 Then
Set oRng = oRng.Worksheet.Range(oRng, oRng.Offset(0, 1))
aFormulaNew(n) = "'" & oRng.Worksheet.Name & "'" & "!" & oRng.Address
Else
aFormulaNew(n) = aFormulaOld(i)
Err.Clear
End If
Next n
sTmp = Replace(sBase, "<FORMULA>", Join(aFormulaNew, ","))
Debug.Print "Series(" & s & ") from """ & oCht.SeriesCollection(s).Formula & """ to """ & sTmp & """"
oCht.SeriesCollection(s).Formula = sTmp
sTmp = ""
Next s
Set oCht = Nothing
' End charts update '
End Sub