Referring to a Control via a formula?

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Posted on by Yahya Manasrah

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Is this possible in PowerApps?

For instance I have 2 screens, (named ScreenA and ScreenB) want to have same button in both screens, to navigate, is this possible?

On Select: Navigate (ScreenVAR,fade,done)

while onload for ScreenA has: Set (ScreenVAR, "ScreenA")

and onload for ScreenB has: Set (ScreenVAR, "ScreenB")

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Eickhel 374 Most Valuable Professional on at

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Hey,

As far as I know, every screen has their own set of controls so an easy way could be just copying the button to each screen and then change their OnSelect or go your way:

ScreenA - OnVisible: Set(ScreenVAR, "ScreenB")
-- ButtonA: OnSelect: Navigate (ScreenVAR,fade,done)

ScreenB - OnVisible: Set(ScreenVAR, "ScreenA")
-- ButtonB: OnSelect: Navigate (ScreenVAR,fade,done)

Is this what you wanted to accomplish?

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Yahya Manasrah 515 on at

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Hi @Eickhel, agreed they are 2 different buttons but i meant they have the same formula.

The below does not seam to work because of the topic of this discussion: Referring to a control via a formula? is this possible?

If you look at my PowerApp screenshot, at the left, the side menu used to be buttons, but imagine buttons for +40 screens. I developed the menu eventually via a Gallery, and i was sucessful automate the formula to take me to the right screen via gallry on select.

this is a the on select formula for the menu gallery

If(ThisItem.ecds_screenname="ScreenHome",Navigate(ScreenHome,ScreenTransition.Fade),If(ThisItem.ecds_screenname="ScreenProject",Navigate(ScreenProject,ScreenTransition.Fade),If(ThisItem.ecds_screenname="ScreenProjectDetails",Navigate(ScreenProjectDetails,ScreenTransition.Fade))))

As you see, it is manually done, and this covers 3 screens only. I know I can use excel Concatenate to buld the formula for all screens, but i was thiking use a column in the gallery so my formula would be then super easy:

ScreenHomeOn Visible: Set(CurrentScreen,"Home")
ScreenProject On Visible: Set(CurrentScreen,"Project")
etc.

Menu Gallery OnSelect: Navigate(CurrentScreen, Fade, none)

The issue is that OnSelect is not dealing with the variable CurrentScreen as ScreenName. I used Text(CurrentScreen), same.

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Yahya Manasrah 515 on at

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I think this would work if a control has a Name property then a variable can be assigned. i will be happy if there is another way.

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Eickhel 374 Most Valuable Professional on at

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Maybe something like this:
https://powerusers.microsoft.com/t5/General-Discussion/Navigate-to-target-screen-dynamically-using-Sharepoint/m-p/65946/highlight/true#M27088

or this:
https://powerusers.microsoft.com/t5/General-Discussion/Navigate-to-screen-selecting-element-from-the-list-through-list/m-p/9218/highlight/true#M4046

could help?

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Yahya Manasrah 515 on at

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Hi @Eickhel, Thanks.

The problem is that in the proposed formula of

Switch( ThisItem.Random,
"Screen1",Navigate(Screen1, Fade),
"Screen2",Navigate(Screen2, Fade),
"Screen3",Navigate(Screen3, Fade),
"Screen4",Navigate(Screen4, Fade)
)

I have to call ScreenName for each option. And my objective is to calling screenname via a formula, so i dont make the furmula very long.

But it does not seams to be working

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Eickhel 374 Most Valuable Professional on at

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True but what about the another proposed solution?

https://powerusers.microsoft.com/t5/General-Discussion/Navigate-to-screen-selecting-element-from-the-list-through-list/m-p/9218/highlight/true#M404

It uses a collection of screens.

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Yahya Manasrah 515 on at

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This might be the start to finda way, thanks for sharing! and thanks for being there..

link solution says
If you are using a dropdown or listbox control for the screen selection, please do the following:

Dropdown1.Items = [Screen1, Screen2, Screen3]
Dropdown1.OnChange = Navigate(Dropdown1.Selected.Value, Fade)

I tried the easy scenario for testing:
the seconf line of the code gives an error: "The function 'Navigate' has some invalid arguments"

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Eickhel 374 Most Valuable Professional on at

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OK, I think I got a way. First I created a collection with all the screens of this test app (keep in mind the @):

ClearCollect(Screens,[[@FormScreen1],[@Screen1]])
Then I created a button with this code in the OnSelect:
Navigate(Last(Screens).Value, ScreenTransition.None)
It's working.

You need to change the logic for when or where to navigate... but I think this might work for you.

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Yahya Manasrah 515 on at

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Hi again my friend @Eickhel. not seams to be working 😞

if you are sure can you package for me the test app?

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Eickhel 374 Most Valuable Professional on at

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Sure, I've created a Contact template app and added a Waffle button on the main screen that goes to the last screen of the Screens collection. The collection gets created in the OnVisible property of the main screen so you might want to test this on a published version because the designer doesn't always trigger the OnVisible correctly.

Screentest_201806...

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