PowerApps First Character <> 8

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Posted on by kbashaw

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Hello,

I have a textinput field called TextNumber.

I need to throw a message if they start entering a number that starts with an 8 and disable Button1.

Thank you in advance!

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Building Power Apps

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SebS 4,867 Super User 2026 Season 2 on at

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Hi @kbashaw

To disable the button, place the below code to DisplayMode property of the button

If(IsBlank(Find(8,TextNumber.Text,1)),DisplayMode.Edit,DisplayMode.Disabled)

Now the issue is with the message. You can trigger it only when the User finishes typing using the OnChange property.

Here is code for OnChange

If(IsBlank(Find(8,TextNumber.Text,1)),"",Notify("Warning Message",NotificationType.Warning))

Another option is a label where in the Text property, You will place the:

If(IsBlank(Find(8,TextNumber.Text,1)),"","Warnning Massage")

Cause warning massage-like Notifications can be only triggered when text is submitted
kbashaw 233 on at

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THANK YOU!
I appreciate the different variations you gave me too!
I did have to change this:
If(IsBlank(Find(8,TextNumber.Text,1)),"","Warnning Massage")
to
If(IsBlank(Find(8,TextNumber,1)),"","Warnning Massage")
It wouldn't take the .Text
Thank you again for your help!
kbashaw 233 on at

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I found a bug with the solution code. It's not searching for the first character position. For example: The error message and button need to be disabled if they enter an 8 only in the first position. That works, however, if they enter 58, the button is disabled, and error message appears. 58 would be a valid number, 85 would not be.
Thoughts?
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SebS 4,867 Super User 2026 Season 2 on at

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@kbashaw

You are right.

Change the formulas for the label:

If(IsBlank(Find(8,Left(TextNumber.Text,1),1)),"","Warnning Massage")

And for the button:

If(IsBlank(Find(8,Left(TextNumber.Text,1),1)),DisplayMode.Edit,DisplayMode.Disabled)
kbashaw 233 on at

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Thank you! That fixed it for me.