Identify Previous Screen For Back Button (Alternative to "back ()" Function)

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Posted on 26 Mar 2022 17:26:17 by Community Power Pla...

Hello everyone,

I currently have an app with a Back button on a screen that holds a glossary of 3D objects. The button uses the "back ()" function to navigate to the previous screen. This button works in edit mode, but will not work when using the published app from a computer, tablet, or phone. The page will display a "page not responding" message after trying to execute for a while, probably due to the large amount of 3D objects the screen holds. I can't use a simple "Navigate (X page)" function, because the user will be accessing the glossary from different screens, and won't be returning to the same screen each time.

So, I am looking for a solution to the problem, perhaps creating a global variable or a collection to somehow identify the previous screen? I am VERY new to PowerApps, so any help with this would be greatly appreciated!

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Pstork1 66,382 Most Valuable Professional on 26 Mar 2022 at 18:02:51

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Re: Identify Previous Screen For Back Button (Alternative to "back ()" Function)

If you make a collection of objects that has the previous screen and an ID or keyname at startup you can then save the current screen ID when you navigate to another screen. Then use a lookup on that ID to go back.

#in OnStart ClearCollect(myScreens,{id:1,Screen: Screen1},{id:2,Screen: Screen2},{id:3,Screen: Screen3}) #OnSelect to navigate to screen 2 Navigate(LookUp(myScreens,id=2).Screen,ScreenTransition.Fade);Set(BackScreen,LookUp(myScreens,Screen=Screen1).id) #OnSelect to navigate back Navigate(LookUp(myScreens,id=BackScreen).Screen,ScreenTransition.Fade);