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Reset the screen details in canvas app

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Posted on by pujaclb

I have a screen with an image with 2 seats overlayed by button control.
The functionality of each button is to throw a notification error if it is reserved(grey color) or navigate to next screen "SeatDetails" if it is available(green color).
The details of seat availability is retrieved from list "Seat Reservation"
I have following formula on OnSelect property:
If(
!IsEmpty(Filter('Seat Reservation', Title = SelectedSeat && Status.Value = "Reserved")),
Notify("This seat is already reserved", NotificationType.Error),
Navigate(SeatDetails, ScreenTransition.None, {SelectedSeat: SelectedSeat, SelectedDateTime: Now()}),
Set(SelectedSeat, "1")
);

My problem when i start the app, if I select a reserved seat it throws the notification error and then when i try to select available seat it shows the same error and does not navigate to next screen.
On the other hand, if i select available seat first, it navigates to next screen and when i go back to first screen and select reserved seat it still navigates to next screen instead of showing the error.

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v-jefferni Microsoft Employee on at

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Hi @pujaclb ,

Could you please share more details about your scenario? Where are the two buttons located, just on the screen or inside a Gallery? I see SelectedSeat in that formula and suspect it's a variable, right? If it is, how will you update it? If it's not updated, tapping the buttons will always look into 'Seat Reservation' and search the same seat to check if it's Reserved.

Best regards,

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pujaclb 15 on at

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Hi @v-jefferni

The two buttons are just on screen and yes I have set the variable SelectedSeat to 1 and 2 for seat 1 and seat 2 (hard coded) respectively.

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v-jefferni Microsoft Employee on at

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Hi @pujaclb ,

Please just try below formulas on respective Button:

Reserved seat:

UpdateContext({SelectedSeat: "1"}); If( LookUp('Seat Reservation', Title = SelectedSeat).Status.Value = "Reserved", Notify("This seat is already reserved", NotificationType.Error), Navigate(SeatDetails, ScreenTransition.None, {SelectedSeat: SelectedSeat, SelectedDateTime: Now()}) );

Available seat:

UpdateContext({SelectedSeat: "2"}); If( LookUp('Seat Reservation', Title = SelectedSeat).Status.Value = "Reserved", Notify("This seat is already reserved", NotificationType.Error), Navigate(SeatDetails, ScreenTransition.None, {SelectedSeat: SelectedSeat, SelectedDateTime: Now()}) );

Best regards,

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