Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Detecting Errors in Conditional Formatting Formulas.

Detecting Errors in Conditional Formatting Formulas

by Allen Wyatt
(last updated December 11, 2018)

3

Allan uses a lot of conditional formatting, nearly always using formulas to specify the conditions for the formatting. Recently he discovered, by chance, that he had a #REF! error in one of his conditional format formulas. As far as Allan could figure, this was the result of deleting the row of a cell referred to in the formula. The impact is that the conditional formatting won't work for that condition. This has made Allan concerned that there are other instances of conditional formats that have become corrupted since originally being set up. He wonders if there is any simple way of checking all conditional formatting so that these errors can easily be found.

The best way is to use a macro to step through all the conditional formats defined for a worksheet. The following macro does just that, looking for any #REF! errors in the formulas.

Sub FindCorruptConditionalFormat()
    Dim c As Range
    Dim fc As Variant

    Selection.SpecialCells(xlCellTypeAllFormatConditions).Select
    For Each c In Selection.Cells
        For Each fc In c.FormatConditions
            If InStr(1, fc.Formula1, "#REF!", _
              vbBinaryCompare) > 0 Then
                MsgBox Prompt:=c.Address & ": " _
                  & fc.Formula1, Buttons:=vbOKOnly
            End If
        Next fc
    Next c
End Sub

If an error is found, then a message box displays both the address of the cell and the formula used in the conditional formatting rule.

Note:

If you would like to know how to use the macros described on this page (or on any other page on the ExcelTips sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (11361) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. You can find a version of this tip for the older menu interface of Excel here: Detecting Errors in Conditional Formatting Formulas.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

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Comments

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What is nine more than 3?

2018-10-06 15:32:47

David Gray

When I am concerned that a formula upon which I intend to base a conditional format might raise errors, I have a two-step process, applied at design time, that has served me well for over a decade.

First, I code the formula in a regular cell, and thoroughly test it by supplying a variety of problematic inputs. This is easier than you think, since live cells that affect a formula can be temporarily changed, one at a time, and restored by way of the Ctrl-Z (undo) accelerator.

Second, once I have the conditional format set up, I apply the same technique, changing inputs to force the formula to evaluate to TRUE, and verifying that the color changes as expected.

If you are a software engineer, there is a name for this technique, unit testing. Though not as formal as the approaches applied in traditional software engineering, such informal unit testing is effective, and I use it regularly to test complex formulas.


2018-10-06 13:22:35

Roger Shaw

PROBLEM:
For Each fc In c.FormatConditions
If InStr(1, fc.Formula1, "#REF!", _
vbBinaryCompare) > 0 Then ...

failed with:
Run-time error 438: "Object doesn't support this property or method"

VBA debug quicklook shows the following:
Expression | Value | Type
--------+---------+----------------------------
c | "DOW" | Variant/Object/Range
fc | | Variant/Object/UniqueValues

(fc is empty / nothing)

VBA debug quicklook for "fc.Formula1" shows same error as above

The c Value was "DOW" - which I found in cell A1 (and ONLY in Cell A1 in in the whole workbook)
Cell $A$1 had a "Duplicate Values" conditional formula for a range of cell $A$1 ONLY! (And which I never entered, and have no idea where it came from!)
After deleting the Conditiona Format from $A$1, the Macro ran...
I added a "Duplicate Values" fc back to cell $A$1, and got the same error.

I have seen this with 'For Each' loops before - you can hit a type of Variant that does NOT have the property (.Formula1) and blows up the VBA. I had to put special checks in the code to catch this problem.


2018-10-06 10:07:33

Col Delane

The variable fc has not been declared.


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