I'm trying to do a validation in one of our list. Basically, I have a Drop Down box with 5 choices (let's say choice1 to choice5).

If choice2 OR choice3 is choosen, I'd like to have a mandatory field (single line of text). I can't come up with the correct syntax to make it work. Here's something not working.


2 Answers 2


You can try below


The logic is

if c1 = choice2 or c2 = choice3
      check if c2 is blank (if blank return false, else return true)
      return true


  • Hi and thanks for your answer! I've tried it and can't make it work. Here's what I've tried: =IF(OR([column1]="choice2";[column1]="choice3");ISBLANK([simplelineoftext1],TRUE)) This is getting me a syntax error.
    – opiace
    Jan 27, 2015 at 13:05
  • You did it wrong. it should be =IF(or([column1]="choice2";[column2]="choice3");isblank([simplelineoftext1]);true) Jan 27, 2015 at 13:10
  • Ok, I got rid of the syntax error but the validation doesn't work still: =IF(OR([column1]="choice2";[column1]="choice3");ISBLANK([simplelineoftext1]);TRUE)
    – opiace
    Jan 27, 2015 at 13:17
  • I just saw your reply, thanks for your time! I'm not sure I understand the [column2] in your formula. The drop down box is 5 choices in the same column. Let's say; "Which fruit you like the most" 1. strawberry, 2. pineapple, 3. apple. If choice 2 or 3 is choosen, make the simplelineoftext mandatory. Hopefully it's a bit more clear hehe
    – opiace
    Jan 27, 2015 at 13:20

I have achieved the same for 2 choices using below Formula, hope including another choice (IF condition) works for you.


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