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Validation – custom form

If you start from a custom lists it will give you the basic form validation.

Removed al required fields from the List. – (form will submit empty).

0. On AppStart set the global variables

Set(isFormValid, false);
Set(isTitleValid, false);
Set(isNumberValid, false);

1. In PowerApp selected data card and set required to true, (form will not submit until field is empty)

2. Set the error label to a variable:titleErrorMessage

3. set the error visibility to a variable: showTitleErrorMessage

4. Set the value of error label onChange of the input box. // This will take care of to show the error it will still submit form.

If(
    IsBlank(Title_Value.Text),
    UpdateContext(
        {
            titleErrorMessage: "Error - Title cannot be empty.",
            showTitleErrorMessage: true
        }
    );
    Set(
        isTitleValid,
        false
    ),
    UpdateContext(
        {
            titleErrorMessage: "",
            showTitleErrorMessage: false
        }
    );
    Set(
        isTitleValid,
        true
    )
);

5. For Number Values

If(
    Value(Number_Value.Text) < 100,
    UpdateContext(
        {
            numberErrorMessage: "Error - Number must be greater than 100",
            showNumberErrorMessage: true
        }
    );
    Set(
        isNumberValid,
        false
    ),
    Value(Number_Value.Text) > 1000,
    UpdateContext(
        {
            numberErrorMessage: "Error - Number has to be less than 1000",
            showNumberErrorMessage: true
        }
    );
    Set(
        isNumberValid,
        false
    ),
    UpdateContext(
        {
            numberErrorMessage: "",
            showNumberErrorMessage: false
        }
    );
    Set(
        isNumberValid,
        true
    )
)

To stop form from submitting add the following to the SharePointIntegration

OnSave:


If( isNumberValid && isNumberValid, Set(isFormValid,true), Set(isFormValid,false)); 

If(isFormValid,
   Notify("Notification - Form can be submittid.",NotificationType.Error)//;ResetForm(frm),SubmitForm(frm)
);

If(!isFormValid,
   Notify("Notification - Form cannot be submittid.",NotificationType.Error)//;ResetForm(frm),SubmitForm(frm)
)

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