Navigation in App.OnStart not allowed anymore (New App.StartScreen??) - Deep Link problem

[MarkusG]

Hi,

Issue Description:

Since some days I have the problem that the deep linking parameters that I set in App.Onstart are not working anymore. 

I want the users that use the deep link to navigate to a separate page with all the details about the entry.

Apparently it is not allowed anymore to use the "Navigate" function. There is now also an App.StartScreen property and I'm not sure if that is new or was there all the time. I was not able to find any information about it online.

Does anyone know how to fix this, so that the deep linking is working again??

Parameters in App.OnStart:

Set(varDemandIDView, Value(Param("DemandIDView")));
If (varDemandIDView <> 0, Set(varRecord, LookUp('Project Portfolio Management', ID = varDemandIDView)); Navigate(ScreenDisplayDemand_OnePage));

Error Message:

[MarkusG]

@timl , thank you very much for sharing this. This is very useful! Looking forward to the new bright future. 😉

[GoGorilla]

@timl I read the above documents which are very helpful for future rollouts and for any issues that are in the foreseeable future with OnStart user lookups. However, when I moved my Param formula from OnStart to StartScreen and made the necessary changes, I am getting an error "Invalid argument type (Control).  Expecting Control value instead.".  See formulas below.  Any idea why this would not work?

OnStart original formula:

If(
!IsBlank(Param("ID")),
Navigate(HREdit),
Navigate(Gallery2)
)

StartScreen formula:

If(
!IsBlank(Param("ID")),
HREdit, 
Gallery2
)

[Mostafa]

I copied and paste your code and it works for me: 

If(
!IsBlank(Param("ID")),
IfScreen,
ElseScreen
)

Make sure you to save your changes, close the app and re-open and see if the problem still exists.

[timl]

Hi @GoGorilla 

This is very strange. If closing and re-opening the app doesn't work, can you confirm where this error appears? Does it appear against the StartScreen property?

[GoGorilla]

@Mostafa @timl  I tried closing and re-opening the app but it still is throwing the error against the StartScreen property.  I am working in a GCC E3 environment but that should not matter given that the Navigate function no longer works in OnStart property and the StartScreen property is available, but I have seen where Microsoft states that something is available for GCC when in fact it has not launched in every tenant.

[Mostafa]

@GoGorilla Please send inbox me your email and will setup a call to check in your issue.

[TWolsten]

I am still struggling with this new StartScreen.

My previous function in the OnStart was:

If(
  !IsBlank(Param("RiskID")),
        Set(varID, Value(Param("RiskID")));
        Navigate(RiskFormScreen, Fade)
);

But I can't seem to set the variable and then navigate to the Form

If(
  !IsBlank(Param("RiskID")),
        Set(varID, Value(Param("RiskID"))) + FormScreen,
        Home
)

[Mostafa]

Global Variables are not supported in StartScreen. Read more here: App object in Power Apps - Power Apps | Microsoft Docs

[TWolsten]

Does that mean my old solution will no longer work?

How can I pass an ID of the item from the Param in the URL into the app to show the specific item in the Gallery when the app starts up?

[Mostafa]

@TWolsten you can still keep the app using OnStart with no issues.