Conditional Formatting In Google Sheets: Can I Use Custom Function In The 'custom Formula Is:' Field?


Answer :

Short answer


A custom function can't be used as a part of a custom formula in the Google Sheets' conditional formatting built-in user interface.


Explanation


In Google Sheets, a custom function is like spreadsheet built-in functions but written by the user using the Google Apps Script editor. They can't modify other objects, only return one or multiple values.


By the other hand, a custom function only is calculated when it's added to a cell or when at least one of it's parameters changes. They can't use non-deterministic functions as parameters like NOW(), TODAY(), RAND() and RANDBETWEEN().


Test


In order to test the statement in the short answer, I created a did the following:



  1. Create a simple custom function


function two() {
  return 2;
}


  1. Add the custom function as part of a custom formula in the conditional formatting side panel


=two()=2

Result:
Nothing changed.


References



  • Custom Functions in Google Sheets



I have also found that custom functions cannot be used for conditional formatting. However, I located a pretty simple workaround.



The custom formula that I tried to use is:
=hasGreen(CELL("address",$H3)&":"&CELL("address",$M3))



ie. format a cell based on a range of other cells in that row.



My solution was to place the above formula into column P. Then I changed my conditional formatting's custom formula to =P3



Worked like a charm. Any change to H3:M3 would call hasGreen and update the value of P3. The conditional formatting would note any change to P3, and adjust the formatting.



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