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Add validation in powerapp forms

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Posted on by Iantaylor2050

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I have a newform in powerapps. I want the validation to be implemented in powerapps side, rather than setting the required field in datasource.

I understand that if we set the required field to true in a datacard and use SubmitForm() function, it automatically throws validation error in the form in red color stating "Field is required". .

However, here i am using Preview button, which just navigates to the next screen, Any idea how to implement similar validation on click of Preview button?

I shouldn't allow user to navigate to next screen on click of Preview button, unless all required fields are filled in.

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Building Power Apps

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Nandit 1,568 Moderator on at

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Hi Iantaylor2050,

Yes, you can use the below in your Button's DisplayMode property after setting the required fields to true:

If( FormName.Valid = false, DisplayMode.Disabled, DisplayMode.Edit )

This will keep the button disabled until the user fills out all the required fields.

You can also use this on the OnSelect property as well. Like this:

If( FormName.Valid, Navigate( ScreenName, ScreenTransition.Fade ), Notify( "Please fill out all the required fields before previewing.", NotificationType.Warning ) )

Hope this helps.

Kind regards,

Nandit

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Michael E. Gernaey 53,335 Super User 2025 Season 2 on at

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Hi,

Since you are NOT looking at the back end to tell you for sure, then you need to actually add in Checks for the validate.

Now you can do this several ways but, here is the simplest.

In your Button OnSelect

let's assume you have a Text Box and a Dropdown

In your DisplayMode,

If(!IsBlank(MyTextBox.Text) And !IsBlank(MyDropdown.Selected),

DisplayMode.Edit,

DisplayMode.Disabled

);

Just remember to add the check as part of the if, for each control you have. Also remember to do it to the control, NOT the datacards where the control sits, people do that by accident, meaning to select the control to get the name and only select the Card.

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