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Validate Text Input has more than 8 numbers

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Posted on by ElvirBotic

Hello,

I am using the modern text input field in a canvas app which I have added to a container. I want to be able to validate that the text input field has 8 characters or more. The text input cannot be blank and has to have 8 or more characters. I have the following code, but I get an error.

If(
    And( Len(Self.Value)>= 8 , IsBlank(Self.Value),
    "Error",
    "None"
)



What is the best way for the validation state to check that it is not blank and has 8 or more characters in it? 

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Building Power Apps

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tsa-svd2srv 204 on at

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If( Or( IsBlank(Self.Value), Len(Self.Value) < 8 ), "Error", "None" )

This should do it. Have fun!

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Pstork1 68,697 Most Valuable Professional on at

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I would use a REGEX expression for this and an IsMatch() function. This should work

isMatch(self.Text, "^\d{8}$")

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timl 36,383 Super User 2025 Season 2 on at

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Hi @ElvirBotic

If you're curious as to why your formula caused an error, it was because you were missing a closing bracket after the And function.

Irrespective of that, you would need to call the Or function to test that the value is greater than 8 characters OR "is blank". Note that the earlier post specified "< 8" which is incorrect.

If( Or(Len(Self.Value)> 8 , IsBlank(Self.Value)), "Error", "None" )

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timl 36,383 Super User 2025 Season 2 on at

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Just to extend on @PStork1's Regex post below, you would need to add "^$" to also check for blank values, and specify {9,} if you don't want it to trigger for input that's exactly 8 characters long.

If( IsMatch(Self.Value, "^$|^.{9,}$"), "Error", "None" )

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tsa-svd2srv 204 on at

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timl:

If we look at your code (my code revised) with just the idea that it need to be 8 or more characters:

If( Len(Self.Value)> 8, "Error", "None" )

Your code results in "Error" if Len is greater than 8.

This is backwards to the requesters post.

The code I submitted is correct.

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timl 36,383 Super User 2025 Season 2 on at

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Hi @tsa-svd2srv

Apologies, yes you're absolutely correct. I misread the question as the input text being no more than 8 characters.

@ElvirBotic - perhaps you can mark @tsa-svd2srv post as the answer if it solves your problem.

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