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Anonymous
Not applicable

DataCards and OnChange

Hi *,

I have a screen with 4 DataCards (DataCard1 -4).

The first DataCard (DataCard1) contains a ComboBox (ComboBox1) with 4 options ("Red", "Green", "Blue" and "Black").

The second DataCard (DataCard2) contains a TextBox (TextBox1).

Both DataCard3 and 4 are currently set to Visible = false.

I would now like to use the event "OnChange" of ComboBox1 to delete any existing text from TextBox1. For this I have tried everything possible, but nothing has worked until now:

 

 

If(IsBlank(TextBox1); Blank(); Parent.Default)
or
TextBox1.Text = ""
or
Reset(TextBox1)

 

 

The second possibility I want to implement here is that when selecting "Red", "Green" or "Blue" the third DataCard (DataCard3) will be visible. If "Black" is selected, DataCard3 and DataCard4 should become visible, with DataCard3 taking the place of DataCard4, i.e. the order of the sequence is reversed.

 

Here are some of my attempts, but none of them led to the desired result:

 

 

DataCard3.Visible = If(ComboBox1.Selected.Value ="Red") Or (ComboBox1.Selected.Value ="Green") Or (ComboBox1.Selected.Value ="Blue"); true; false)
or
DataCard3.Visible = If(ComboBox1.Selected.Value <> "Black” ); true; false)
or
DataCard4.Visible = If(ComboBox1.Selected.Value = "Black” ); true; false) 
or
If(ComboBox1.Selected.Value ="Black"; DataCard4.Visible = true; DataCard4.Visible = false)

 

 

In the DataCard4 there is again a text input (TextBox4). If a number is entered here, it should be multiplied by 0.30 and the result displayed in TextBox1.

All my previous attempts failed, I have the feeling that the event "OnChange" does not work. What am I doing wrong here? Do I see it right that I cannot change anything on other DataCards via the "OnChange" event?

 

I am grateful for every idea.

1 ACCEPTED SOLUTION

Accepted Solutions
Mr-Dang-MSFT
Power Apps
Power Apps



I can clarify a few things here:

  • TextBox1 has a Default property. It is likely set to Parent.Default which means if you're editing an existing item using the form, it inherits the value that has been input for that field. If you're creating a new item in the form, then the default value is blank.
  • Using Reset(TextBox1) in the OnChange property of the ComboBox will reset the text box to its Default value. But because the default is already determined to be the value of the field, it's not possible to overwrite it without the use of a variable. "Reset" does not mean "clear" here.

 

From your requirements, it sounds like:

  • TextBox1's behavior changes based on ComboBox1 and TextBox4.
  • Changes to ComboBox1 should clear TextBox1.
  • Inputs to TextBox4 should place a calculation in TextBox1.

 

Given the many different ways that value in TextBox1 can be changed, it is best to use a variable to hold the value that should be in TextBox1. I'll be using the variable called varTextBox1 to declare what should be in it; name the variable whatever you want.

 

Let's start:

Upon getting to this screen, declare what TextBox1 should begin with in the OnVisible property of the screen. I'm just setting it to 100 for example. In your case, you'd probably set it to whatever it started with.

UpdateContext({varTextBox1: "100"})​

 

In the OnChange of ComboBox1, set it to:

UpdateContext({varTextBox1: Blank()})​

 

In the OnChange of TextBox4, set it to:

UpdateContext({varTextBox1: Text(TextBox4.Text*0.3)})​

 

To be consistent, set the OnChange of TextBox1 to change the variable as well:

UpdateContext({varTextBox1: TextBox1.Text})​

 

Then set TextBox1.Default to:

varTextBox1​

 

Your next requirement is visibility of DataCards 3 and 4. It sounds like:

  • DataCard3 is always visible
  • DataCard4 is only visible when "Black" is selected.

 

I'm thinking that you might as well place DataCard4 above DataCard3. When it's visible, it'll be above. When it's invisible, it's simply not visible.

 

Here's how I structured the visibility:

DataCard3.Visible:

Or(
    ComboBox1.Selected.Value="Red",
    ComboBox1.Selected.Value="Green",
    ComboBox1.Selected.Value="Blue",
    ComboBox1.Selected.Value="Black"
)
DataCard4.Visible

ComboBox1.Selected.Value="Black"

 

You can also simplify the visibility of DataCard3 to this if you do not want it blank.

DataCard3.Visible:

!IsBlank(ComboBox1.Selected.Value)

 

Attached is an app file that you can open with similar patterns. In the studio, go to File > Open > Browse for the msapp file.

 

In my case I used the fluid grid control which works similarly to the Form control, but it just doesn't inherit data. The patterns will be the same though.

 

Let me know if this is the case.

 

Brian

View solution in original post

7 REPLIES 7
MrNappa
Kudo Commander
Kudo Commander

> I would now like to use the event "OnChange" of ComboBox1 to delete any existing text from TextBox1. For this I have tried everything possible, but nothing has worked until now:

You can use a context variable. Try this in the OnChange code of the combo box:

 

UpdateContext({ textbox_default: " " });UpdateContext({ textbox_default: "" })

 

Then set the 'TextBox1.Default' to "textbox_default". ( The extra assignment is necessary because otherwise the variable remains the same and there is no change to trigger)

 

Not sure what's going wrong with the visibility. On the surface, your formula doesn't seem too much off.

/edit: oh, actually; if you're using a combo box, remember that a Combobox is used to select multiple values. ComboBox.Selected will contain a record containing all selected items. E.g.  { Value1: Black, Value2: Red }. You could also check the 'ComboBox.SelectedItems' property, that contains a table with results.

If you doin't want the user to be able to select multiple values, use a Dropdown control instead. 

Anonymous
Not applicable

Hello MrNappa,

thank you for your feedback.

I still don't quite understand why I can't address the individual objects directly, but have to take the detour via a variable. But this is how deleting the content of TextBox1 works now. Thanks a lot.

I hope that I will continue to receive positive feedback on my other more open problems.


@Anonymous wrote:

Hello MrNappa,

thank you for your feedback.

I still don't quite understand why I can't address the individual objects directly, but have to take the detour via a variable. But this is how deleting the content of TextBox1 works now. Thanks a lot.

I hope that I will continue to receive positive feedback on my other more open problems.


Yeah, if you're new to PowerApps it takes some time getting used to the "Excel"-like formula approach of Powerapps, especially if you're coming from a more direct programming language. It has its benefits at times, but it also often results in a lot of shenanigans that feel unnecessary.


(By the way, don't miss the edit that I added later to my post about the combo box)

Anonymous
Not applicable

I have been writing Excel VBA scripts for over 10 years. If I switch something on or off in OnSelect or OnChange, it works without the detour via a variable.

But well, I guess I have to change my mind and learn a lot more.

I have now changed the ComboBox to a ListBox for testing purposes. But also here I cannot make a DataCard visible again via OnChange. Do I possibly have to go to UpdateContext? And how could this look like in my case?

If it still works somehow with hiding and showing the DataCards, how can I multiply the input from TextBox4 and then write the result into the first TextBox1?

Mr-Dang-MSFT
Power Apps
Power Apps



I can clarify a few things here:

  • TextBox1 has a Default property. It is likely set to Parent.Default which means if you're editing an existing item using the form, it inherits the value that has been input for that field. If you're creating a new item in the form, then the default value is blank.
  • Using Reset(TextBox1) in the OnChange property of the ComboBox will reset the text box to its Default value. But because the default is already determined to be the value of the field, it's not possible to overwrite it without the use of a variable. "Reset" does not mean "clear" here.

 

From your requirements, it sounds like:

  • TextBox1's behavior changes based on ComboBox1 and TextBox4.
  • Changes to ComboBox1 should clear TextBox1.
  • Inputs to TextBox4 should place a calculation in TextBox1.

 

Given the many different ways that value in TextBox1 can be changed, it is best to use a variable to hold the value that should be in TextBox1. I'll be using the variable called varTextBox1 to declare what should be in it; name the variable whatever you want.

 

Let's start:

Upon getting to this screen, declare what TextBox1 should begin with in the OnVisible property of the screen. I'm just setting it to 100 for example. In your case, you'd probably set it to whatever it started with.

UpdateContext({varTextBox1: "100"})​

 

In the OnChange of ComboBox1, set it to:

UpdateContext({varTextBox1: Blank()})​

 

In the OnChange of TextBox4, set it to:

UpdateContext({varTextBox1: Text(TextBox4.Text*0.3)})​

 

To be consistent, set the OnChange of TextBox1 to change the variable as well:

UpdateContext({varTextBox1: TextBox1.Text})​

 

Then set TextBox1.Default to:

varTextBox1​

 

Your next requirement is visibility of DataCards 3 and 4. It sounds like:

  • DataCard3 is always visible
  • DataCard4 is only visible when "Black" is selected.

 

I'm thinking that you might as well place DataCard4 above DataCard3. When it's visible, it'll be above. When it's invisible, it's simply not visible.

 

Here's how I structured the visibility:

DataCard3.Visible:

Or(
    ComboBox1.Selected.Value="Red",
    ComboBox1.Selected.Value="Green",
    ComboBox1.Selected.Value="Blue",
    ComboBox1.Selected.Value="Black"
)
DataCard4.Visible

ComboBox1.Selected.Value="Black"

 

You can also simplify the visibility of DataCard3 to this if you do not want it blank.

DataCard3.Visible:

!IsBlank(ComboBox1.Selected.Value)

 

Attached is an app file that you can open with similar patterns. In the studio, go to File > Open > Browse for the msapp file.

 

In my case I used the fluid grid control which works similarly to the Form control, but it just doesn't inherit data. The patterns will be the same though.

 

Let me know if this is the case.

 

Brian

Anonymous
Not applicable

Hello Brian,

Thank you very much for your very detailed information and also thank you for taking the trouble to create a small sample app for me that illustrates all this well.

I now think I understand the UpdateContext function better and I will try to test your suggestions over the days. In any case, I'll get back to you and let you know if I was able to implement all this.

 

Greeting

Herb

Anonymous
Not applicable

Hello Brain,

I'm sorry I didn't get around to writing you until today. With your help I could now realize everything as I imagined it. Thank you very much again. Now I have another small problem, but I will open a new topic right now.

 

Greetings

Herb

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