How to correctly show a label in another screen using a variable?

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Posted on by Gana_Dube

Hi,

What is the best way of displaying the calculation of these labels across screens.

The current way I am doing it is as below:

In the text property for label 4, I have the following:

// lbl_4 >Text:

lbl_1 + lbl_2 + lbl_3

Then in screen 2

In the text property for label 5, there is the following:

// lbl_5 > Text
lbl_4

Is this the correct way to show the value of lbl_4 in the second screen?

Thank you.

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Building Power Apps

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timl 36,785 Super User 2026 Season 1 on at

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Hi @Gana_Dube

Yes, this is an acceptable way to show the value of lbl_4 in the second screen.

The comment I would make is that I tend to explictly convert text values to numbers to avoid any potential problems. eg - the mobile players can behave differently and this syntax will be more guaranteed to work everywhere.

Sum(Value(lbl_1.Text) , Value(lbl_2.Text), Value(lbl_3.Text))

The second point is that this will cause a cross screen dependency between screen 2 and screen 1, which is likely to cause a warning in the "app checker". For a small app, this will be ok but on a larger app, it would be better to minimise these types of dependencies by using a variable.

To use a variable, you would locate the formula that you use on screen 1 to navigate to screen 2, and you would pass the calculation in the call to navigate.

Navigate(Screen2, None, {locTotal:Sum(Value(lbl_1.Text) , Value(lbl_2.Text), Value(lbl_3.Text))} )

On label 5, you can then set the text property to locTotal to display the total.

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NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @Gana_Dube ,
You can directly refer value in controls and use the value in different screen. For example if you have label1, label2 and label3 in screen 1 and you want to show sum of these 3 labels in screen 2, you can use -
Sum(Value(Label1.Text), Value(Label2.Text), Value(Label3.Text))

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Gana_Dube 99 on at

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@timl correct, that is what prompt my alternative solutioning, due to the insufficient delay loading warnings in the " app checker ", which were mostly linked to the "lbl_5". There are more labels to 30 other warnings.

I am not understanding the navigation call to variable method.
Where is that function added?

The last part is fine
//lbl_5 > Text: locTotal

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Gana_Dube 99 on at

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@NandiniBhagya20 the challenge with this method, is that I make any computational string changes, I'll have to manually update the second screen. Example.
If I remove Value(Label3.Text) from the first screen, I'll have to remember to do that for the second screen. But the current scenario is that I have 40+ labels in the second screen. So a dynamic approach is much better. Because lbl_4 never changes, only the values in it.

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timl 36,785 Super User 2026 Season 1 on at

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Hi @Gana_Dube

How do users navigate to screen 2 from screen 1? If you locate the icons/buttons that navigate the user to screen 2, there will be a call to the Navigate function. This is the formula that you would modify.

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Gana_Dube 99 on at

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Hi @timl , thank you, I populated only 1 navigation control with the following command:
// Navigation to Screen 2 Navigate(screen_2, ScreenTransition.Fade, {lbl_5:Sum(Value(lbl_1A.Text) + Value(lbl_1B.Text) + Value(lbl_1C.Text)), lbl_6:Sum(Value(lbl_2A.Text) + Value(lbl_2B.Text) + Value(lbl_3B.Text))}... )
The difference is that I have 5 screens in total, and the last screen is the summary screen. And two 5 navigation buttons which lead to the last screen, which means that I have to duplicate the same code in all the navigation icons which quick jump to the summary.

If only I could create a global function which does all the calculations then reference that function in all the navigation to final screen.

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