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Validate a Form Control Card using the On Change property

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Posted on by hnordenberg

Is it possible to validate a field inside a Form Control using the On Change property? I would like to validate the field as a user tabs through the form rather than waiting until they click submit. How could I accomplish this?

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rubin_boer 4,841 Super User 2024 Season 1 on at

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Hi @hnordenberg you can validate the control, check this: Power Apps Text Input Pattern Validation - @WonderLaura

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hnordenberg 16 on at

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Thanks for the reply. How do you get it to validate the card and show the error message WITHOUT hitting the submit button on the form? I want to show the error as soon as they tab away from the field (using the OnChange property)?

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rubin_boer 4,841 Super User 2024 Season 1 on at

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@hnordenberg

you will do that by setting the variable on in OnChange.

Consider this

I want to notify the user if they entered a text longer than 45 characters and its not a text i expect, let's say hello.

I will check the textinput

Then set an info button to visible where the user can see they need to do something, this can be replaced by making the error text visible - i just prefer info buttons.

Because i have many inputs the variable i update is a record

In the textinput OnChange = UpdateContext({CheckIt:{id: 0, check: Self.Value}})

The visibility of the info button = CheckIt.id = 0 && Len(CheckIt.check) > 4 && CheckIt.check <> "hello"

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