OnClick in Excel VBA

问题:

Is there a way to catch a click on a cell in VBA with Excel? I am not referring to the Worksheet_SelectionChange event, as that will not trigger multiple times if the cell is clicked multiple times. BeforeDoubleClick does not solve my problem either, as I do not want to require the user to double click that requently.

My current solution does work with the SelectionChange event, but it appears to require the use of global variables and other suboptimal coding practices. It also seems prone to error.

回答1:

Clearly, there is no perfect answer. However, if you want to allow the user to

1. select certain cells
2. allow them to change those cells, and
3. trap each click,even repeated clicks on the same cell,

then the easiest way seems to be to move the focus off the selected cell, so that clicking it will trigger a Select event.

One option is to move the focus as I suggested above, but this prevents cell editing. Another option is to extend the selection by one cell (left/right/up/down),because this permits editing of the original cell, but will trigger a Select event if that cell is clicked again on its own.

If you only wanted to trap selection of a single column of cells, you could insert a hidden column to the right, extend the selection to include the hidden cell to the right when the user clicked,and this gives you an editable cell which can be trapped every time it is clicked. The code is as follows

Private Sub Worksheet_SelectionChange(ByVal Target As Range)   'prevent Select event triggering again when we extend the selection below   Application.EnableEvents = False   Target.Resize(1, 2).Select   Application.EnableEvents = True End Sub 

回答2:

In order to trap repeated clicks on the same cell, you need to move the focus to a different cell, so that each time you click, you are in fact moving the selection.

The code below will select the top left cell visible on the screen, when you click on any cell. Obviously, it has the flaw that it won't trap a click on the top left cell, but that can be managed (eg by selecting the top right cell if the activecell is the top left).

Private Sub Worksheet_SelectionChange(ByVal Target As Range)   'put your code here to process the selection, then..   ActiveWindow.VisibleRange.Cells(1, 1).Select End Sub 

回答3:

SelectionChange is the event built into the Excel Object model for this. It should do exactly as you want, firing any time the user clicks anywhere...

I'm not sure that I understand your objections to global variables here, you would only need 1 if you use the Application.SelectionChange event. However, you wouldn't need any if you utilize the Workbook class code behind (to trap the Workbook.SelectionChange event) or the Worksheet class code behind (to trap the Worksheet.SelectionChange) event. (Unless your issue is the "global variable reset" problem in VBA, for which there is only one solution: error handling everywhere. Do not allow any unhandled errors, instead log them and/or "soft-report" an error as a message box to the user.)

You might also need to trap the Worksheet.Activate() and Worksheet.Deactivate() events (or the equivalent in the Workbook class) and/or the Workbook.Activate and Workbook.Deactivate() events so that you know when the user has switched worksheets and/or workbooks. The Window activate and deactivate events should make this approach complete. They could all call the same exact procedure, however, they all denote the same thing: the user changed the "focus", if you will.

If you don't like VBA, btw, you can do the same using VB.NET or C#.

[Edit: Dbb makes a very good point about the SelectionChange event not picking up a click when the user clicks within the currently selected cell. If you need to pick that up, then you would need to use subclassing.]

回答4:

I don't think so. But you can create a shape object ( or wordart or something similiar ) hook Click event and place the object to position of the specified cell.

回答5:

This has worked for me.....

Private Sub Worksheet_Change(ByVal Target As Range)      If Mid(Target.Address, 3, 1) = "$" And Mid(Target.Address, 2, 1) < "E" Then        ' The logic in the if condition will filter for a specific cell or block of cells        Application.ScreenUpdating = False        'MsgBox "You just changed " & Target.Address         'all conditions are true .... DO THE FUNCTION NEEDED         Application.ScreenUpdating = True     End If     ' if clicked cell is not in the range then do nothing (if condttion is not run)   End Sub 

NOTE: this function in actual use recalculated a pivot table if a user added a item in a data range of A4 to D500. The there were protected and unprotected sections in the sheet so the actual check for the click is if the column is less that "E" The logic can get as complex as you want to include or exclude any number of areas

block1  = row > 3 and row < 5 and column column >"b" and < "d"  block2  = row > 7 and row < 12 and column column >"b" and < "d"  block3  = row > 10 and row < 15 and column column >"e" and < "g"  If block1 or block2 or block 3 then   do function ..... end if   

回答6:

I had a similar issue, and I fixed by running the macro "onTime", and by using some global variables to only run once the user has stopped clicking.

Public macroIsOnQueue As Boolean Private Sub Worksheet_SelectionChange(ByVal Target As Range)     macroIsOnQueue = False     Application.OnTime (Now() + TimeValue("00:00:02")), "addBordersOnRow"     macroIsOnQueue = True End sub Sub addBordersOnRow()     If macroIsOnQueue Then                macroIsOnQueue = False        ' add code here     End if End sub 

This way, whenever the user changes selection within 2 seconds, the macroIsOnQueue variable is set to false, but the last time selection is changed, macroIsOnQueue is set to true, and the macro will run.

Hope this helps, Have fun with VBA !!

文章来源: OnClick in Excel VBA