by Allen Wyatt
(last updated January 4, 2021)
Murray needs a way to control the entry of data into cell B1. If cell A1 contains the capital letter "A," then the user should be able to enter data into cell B1. If cell A1 contains anything but the capital letter "A," then no data entry should be allowed in cell B1 and cell B1 should show "N/A" (not the error value #N/A, but the letters "N/A").
There are two ways to go about this. One way is to use a macro that checks to see if A1 contains "A" or not. If it does, then the macro keeps whatever is in cell B1, unless B1 had previously been set to "N/A." (If it had, then B1 is cleared.) If A1 does not contain "A," then whatever is in cell B1 is replaced with the characters "N/A."
Private Sub Worksheet_Change(ByVal Target As Range) Dim sTemp As String If Target.Address(False, False) = "A1" Or _ Target.Address(False, False_ = "B1" Then 'Store B1's text in variable sTemp = Range("B1").Text Application.EnableEvents = False If Range("A1").Text = "A" Then If sTemp = "N/A" Then Range("B1") = "" Else Range("B1") = "N/A" End If Application.EnableEvents = True End If End Sub
Note that this is simply one macro-based approach; there are many other approaches that could be used, depending on what behavior you want to have take place if either cell A1 or B1 are selected. In the case of this macro, it should be saved in the ThisWorkbook module so that it triggers whenever something is changed in the worksheet.
The other approach you can use doesn't involve macros at all. Instead, it relies on conditional formatting. Follow these steps:
Figure 1. The New Formatting Rule dialog box.
The custom format you defined in step 9 causes Excel to display the letters "N/A" when the value is a number (positive, negative, or zero) or text. Since you set all 4 conditions to the same thing, then all of them will display "N/A." This approach changes the display, but it still allows the user to enter a value into cell B1—it just won't display properly unless the first letter in cell A1 is "A."
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