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jzcase
Responsive Resident
Responsive Resident

Not possible to Set or UpdateContext to established variables from inside a DataCard in a Form Control?

I have a pretty simple (I think) use case.

 

I want to show the user a different Edit Form on the same screen depending on a context variable, LogMode.

 

If LogMode="log", show Form1

If LogMode="mileage", show Form2

If LogMode="codes", show Form3

 

I can do this pretty easily with 3 buttons on the Screen with OnSelect=UpdateContext({LogMode:"whatever"}) and my forms appear or disappear as expected. Good! So I have a safety net.

 

BUT my preference would be to do this without buttons! It would be nice if the first DataCard of each form had a drop-down (pulling options from Dynamics365 Option Set), and the user's selection would UpdateContext({LogMode:"whatever"}) and make the proper form appear without thinking about it.

 

So I tried setting the OnChange property of the first DataCard of each Edit Form to something like:

 

If(DataCardValue12.Selected.Value="Travel",UpdateContext({LogMode:"mileage"}),if(DataCardValue12.Selected.Value="No Session",UpdateContext({LogMode:"codes"}),UpdateContext({LogMode:"log"})))

 

This code produced no errors, but it would not work! I kept a test label on the Screen showing me the current LogMode and it refused to change.

 

I also tried using a global variable instead but no difference in behavior.

 

So here's my main question: are Form controls "sandboxed" in some way so that they can't affect variables established outside of themselves? I see people in these threads seem to use variable declarations inside Form controls all the time, so I don't know what I'm doing wrong.

1 ACCEPTED SOLUTION

Accepted Solutions
v-xida-msft
Community Support
Community Support

Hi @jzcase ,

Do you create three separated Edit forms (Form1, Form2 and Form3) within your app, and want to display them based on the LogMode variable?

 

Based on the formula that you provided, I think there is something wrong with it. The DataCardValue12 could only represents the first Combo Box/Dropdown Data card within a single one Edit form, rather than that within each Edit form.

 

Based on the needs that you mentioned, I have made a test, if you want to display/hide your Edit forms based on the variable set up within your Edit form, I afraid that there is no way to achieve your needs in PowerApps currently.

 

As an alternative solution, you could consider add a Dropdown control (or ComboBox) outside the Edit form (within the screen) to achieve your needs. I have made a test on my side, please take a try with the following workaround:

Add a Dropdown control (Dropdown1) within your Edit screen, set the Items property to following:

["log", "mileage", "codes"]

Set the Visible property of the Form1 to following:

If(Dropdown1.Selected.Value = "log", true, false)

Set the Visible property of the Form2 to following:

If(Dropdown1.Selected.Value = "mileage", true, false)

Set the Visible property of the Form3 to following:

If(Dropdown1.Selected.Value = "codes", true, false)

Please take a try with above alternative solution, then check if the issue is solved.

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

View solution in original post

4 REPLIES 4
v-xida-msft
Community Support
Community Support

Hi @jzcase ,

Do you create three separated Edit forms (Form1, Form2 and Form3) within your app, and want to display them based on the LogMode variable?

 

Based on the formula that you provided, I think there is something wrong with it. The DataCardValue12 could only represents the first Combo Box/Dropdown Data card within a single one Edit form, rather than that within each Edit form.

 

Based on the needs that you mentioned, I have made a test, if you want to display/hide your Edit forms based on the variable set up within your Edit form, I afraid that there is no way to achieve your needs in PowerApps currently.

 

As an alternative solution, you could consider add a Dropdown control (or ComboBox) outside the Edit form (within the screen) to achieve your needs. I have made a test on my side, please take a try with the following workaround:

Add a Dropdown control (Dropdown1) within your Edit screen, set the Items property to following:

["log", "mileage", "codes"]

Set the Visible property of the Form1 to following:

If(Dropdown1.Selected.Value = "log", true, false)

Set the Visible property of the Form2 to following:

If(Dropdown1.Selected.Value = "mileage", true, false)

Set the Visible property of the Form3 to following:

If(Dropdown1.Selected.Value = "codes", true, false)

Please take a try with above alternative solution, then check if the issue is solved.

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

You're right: "DataCardValue12 could only represents the first Combo Box/Dropdown Data card within a single one Edit form, rather than that within each Edit form."

 

I have already implemented a similar solution to what you describe using buttons.

 

I hoped I could get past that limitation by having DataCardValue12.OnChange = if(DataVardValue12.Selected.Value="Travel",UpdateContext({LogMode:"mileage"}))

 

I take it from your response that I can't do that. Which is fine, I have an alternate solution.

 

But for my knowledge, could someone explain (or point me to an article that explains) why I can't use a Combo Box in each of my 3 forms to update a context variable that toggles their visibility?

Hi @jzcase ,

Just an update -- you could consider take a try to set up this variable in the OnChange property of first ComboBox Data card in each of your three Edit forms.

 

I have made a test on my side, please take a try with following workaround:

Set the OnChange property of the first ComboBox Data card (ComboBox1) in your Form1 to following:

If(
  ComboBox1.Selected.Value = "log", 
  Set(LogMode, "log"), 
  ComboBox1.Selected.Value = "mileage",
  Set(LogMode, "mileage"),
  ComboBox1.Selected.Value = "codes",
  Set(LogMode, "codes")
)

Set the Visible property of the Form1 to following:

If(LogMode = "log", true, false)

 

Set the OnChange property of the first ComboBox Data card (ComboBox2) in your Form2 to following:

If(
  ComboBox2.Selected.Value = "log", 
  Set(LogMode, "log"), 
  ComboBox2.Selected.Value = "mileage",
  Set(LogMode, "mileage"),
  ComboBox2.Selected.Value = "codes",
  Set(LogMode, "codes")
)

Set the Visible property of the Form2 to following:

If(LogMode = "mileage", true, false)

 

Set the OnChange property of the first ComboBox Data card (ComboBox3) in your Form3 to following:

If(
  ComboBox3.Selected.Value = "log", 
  Set(LogMode, "log"), 
  ComboBox3.Selected.Value = "mileage",
  Set(LogMode, "mileage"),
  ComboBox3.Selected.Value = "codes",
  Set(LogMode, "codes")
)

Set the Visible property of the Form3 to following:

If(LogMode = "codes", true, false)

 

In addition, when you load your Edit form, set one of your three Edit forms as the Default display form. Please take a try with the following workaround:

Set the OnVisible property of the Edit screen to following:

Set(LogMode, "log")

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
v-xida-msft
Community Support
Community Support

Hi @jzcase ,

Have you solved your problem?

 

If you have solved your problem, please go ahead to click "Accept as Solution" to identify this thread has been solved.

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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