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Conditional formatting via dropdowns and checkboxes

Muttley)A

New Member
Hi,
I am using a spreadsheet to keep track of our teams tasks throughout the week.
Each task requires the team member to have prerequisites before they are able to start the task, so I was going to use conditional formatting to highlight the cell if the prerequisite conditions are not met.

To achieve this, I have a 3 sheets in my workbook
The first one Tasks – This is a table where I use a dropdown list to select the team members of the working party, and then another dropdown to select their task.
Screenshot_20260220_152137_Word.jpg

The next sheet is Cond – this is a table, where the first column is the team members, and then the following columns are the tasks. I have then placed a checkbox in the table cells which would be ticked if the prerequisites are met

Screenshot_20260220_152140_Word.jpg

The 3rd sheet is List – this contains the lists I use for the dropdowns on the Tasks page.
I thought the following would work for conditional formatting (under new rule>use a formula)
=XLOOKUP($E$3, Cond!$B$1:$D$1, Cond!$A$2:$D$3) = TRUE

· E3 is the cell where I select the task

· Cond!$B$1:$D$1 is the table header that contains the task names

· Cond!$A$2:$D$3 is the table where the checkboxes are

This isn't working and wondered if anyone could give me some advise on how to achieve this.
Thank you for your help
 
difficult for me , anyway, to see from images - you can attach a sample spreadsheet
also what version of excel do you want to use this on

A SMALL sample spreadsheet, around 10-20 rows, would help a lot here, with all sensitive data removed, and expected results mocked up and manually entered, with a few notes of explanation.
 
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