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ericonline
Community Champion
Community Champion

How to determine if a string variable is blank?

How is this accomplished? Now that the advanced editor is missing from Conditions, I don't know how to check to see if a string is empty!

Previously I'd do something like @{empty(variables('varName'))} in the condition. 

image.png

3 ACCEPTED SOLUTIONS

Accepted Solutions
Gristy
Resident Rockstar
Resident Rockstar

you can use null in a express on the right side

 

or

 

use length(var) on the left is greater than 0.

View solution in original post

abm
Super User
Super User

Hi @ericonline 

 

Did you tried using the length expression?

 

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View solution in original post

RezaDorrani
Dual Super User
Dual Super User

Hi @ericonline 

 

You can still use the old expression @{empty(variables('varName'))}

 

just this time becuase its being used in a  condition

 

Capture.PNG

 

--------------------------------------------------------------------------------
If this post helps answer your question, please click on “Accept as Solution” to help other members find it more quickly. If you thought this post was helpful, please give it a Thumbs Up.

 

View solution in original post

5 REPLIES 5
Gristy
Resident Rockstar
Resident Rockstar

you can use null in a express on the right side

 

or

 

use length(var) on the left is greater than 0.

abm
Super User
Super User

Hi @ericonline 

 

Did you tried using the length expression?

 

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up.

 

Thanks



Did I answer your question? Mark my post as a solution!

If you liked my response, please consider giving it a thumbs up


Proud to be a Flownaut!

Learn more from my blog
Power Automate Video Tutorials
RezaDorrani
Dual Super User
Dual Super User

Hi @ericonline 

 

You can still use the old expression @{empty(variables('varName'))}

 

just this time becuase its being used in a  condition

 

Capture.PNG

 

--------------------------------------------------------------------------------
If this post helps answer your question, please click on “Accept as Solution” to help other members find it more quickly. If you thought this post was helpful, please give it a Thumbs Up.

 

I've tried @RezaDorrani 's solution and it worked. I'll mark all three of your suggestions as a solution as I'm sure they also work.

Thank you very much!

No, you can't use a null expression with a string variable.   A condition that checks if a string variable is not null will always come true, because it's not null, it's an empty string.  Use empty or length.

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