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ValeriaBreve
Advocate II
Advocate II

toggle On Change property triggered at every FormDisplay mode change?

Hello,

there is a property on toggle I really cannot grab - on Change.

I assigned a variable to it, the toggle will switch on and off based on conditions and on change update the variable. And I would like to keep it this way - the variable update should only be triggered at the moment where the value gets changed.

 

However, every time I go from the form view mode to edit mode the OnChange property is re-read and the variable gets re-assigned according to the toggle value, even though the toggle has not been changed.

 

Is there a workaround? I cannot use the "OnSelect" property as it is not triggered by a calculation (at least that's what I have experienced).

 

Thanks!

Kind regards

Valeria

 

1 ACCEPTED SOLUTION

Accepted Solutions

If you ever reach this post...I have raised the question with Microsoft, below is their statement. So solution should be available in the future.

 

“There are a few controls whose OnChange rule runs whenever data changes (on initialization, on items change, on default value change, on user interaction); these are ComboBox, DatePicker, Slider, and Toggle. All other controls only run their OnChange rule on user interaction.

 

To bring these controls into line with the remaining controls, we are planning to add a preview flag to the settings page to enable strict onchange handling.”

 

 

View solution in original post

12 REPLIES 12
RandyHayes
Super User
Super User

@ValeriaBreve 

Yes, consider not using variables for this!  A variable in PowerApps should only be used when there is a need for a snapshot that cannot be attained otherwise.  

In your case, there is no need to set a variable when the toggle is changed.  You can simply reference the toggle to get the value any time you want.  Ex:  yourToggle.Value is all you need in any place in your app.  Controls are global, so you can get this anywhere.

Creating a variable to gather a value of a control is just extra work for you to do and maintain.

 

I hope this is helpful for you.

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ValeriaBreve
Advocate II
Advocate II

Hi Randy, the thing is that I want to be able to capture the moment when the toggle is set to "true" (hence the "OnChange" property) to have a popup open and inform the user about some stuff, then the user closes the popup, the variable goes back to its "False" state, and I am good with it.

I do not want a permanent check that the toggle value is true. What happens today is that it works as expected, only to have the variable set back to its "true" state (when the toggle value is true) every time the form changes its display mode, meaning that the user keeps getting the popup (1 time is definitely enough). 

Does this make sense? Otherwise yes I would not have used variables but just evaluated the toggle status. Thanks!

 

 

RandyHayes
Super User
Super User

@ValeriaBreve 

Yes, that makes sense!

So the only reason that the toggle would change value is if the default property changes (or, obviously, if the user changes it).  So, I would look to the default property of your toggle to determine where its value is coming from and how it is changing, as that would cause the issue.

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ValeriaBreve
Advocate II
Advocate II

Hi Randy, the default property is a calculation

 

Value(LabelTotalQuantity.Text)>1000 And DataCardValueTransp.Value=true

based on other form values.

 

And OnChange is the variable update

If(DataCardValue154.Value,UpdateContext({showDFT:1}),UpdateContext({showDFT:0}))

 

So what does PowerApp consider as a Change in a Toggle? I would suppose a change in its Value... (from true to false or false to true). But then in this case I am not changing anything whenever I either submit the form or when I change it to view mode, and still the variable gets reset to "1", as if the fact of just changing the Displaymode of the form would force the OnChange property to get triggered and recalculate. I found the same for OnCheck and OnUncheck, the only one that does not have this behaviour seems to be "OnSelect". However, "Onselect" only seems to get triggered by the user manually switching the toggle - the default value changing based on the calculation does not trigger it.

Have you ever experienced this? Do you maybe have a workaround? My users are going to go crazy with the popup showing every time the form status changes. Thanks!

 

 

 

RandyHayes
Super User
Super User

@ValeriaBreve 

Keep in mind what I mentioned about Excel - PowerApps is just like it!  Why do I point this out?  Because just like in Excel, if any cell value changes and there are formulas in other cells that reference that cell, they will all re-evaluate.  The same thing happens in PowerApps.  So, performing calculations based on another control - they will always re-evaluate if there is any change to the other controls they reference.  This is one of the awesome features for PowerApps, but very frustrating to those thinking more "development" like.  

 

So, in your case, changing the DisplayMode is not going to cause any particular re-evaluations, unless you have formulas that reference the DisplayMode of the form.

BUT, the underlying value of the Default is going to change what the toggle shows and thus an action that is performed.

 

And yes, the OnSelect action will only occur if a user clicks on the control.  OnCheck, OnUnCheck and OnChange are all different actions.  Some controls will perform those actions when values change, others not.

 

So back to the story - Is this toggle part of a field of your datasource?  Or is it just an added toggle?

If just added, then where in the formula-chain is the underlying datasource column value?

Does LabelTotalQuantity.Text come from the datasource column?  Or does DataCardValueTransp.Value come from it?

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ValeriaBreve
Advocate II
Advocate II

Hi Randy, in my case the OnChange property is triggered even when no other value changes - so even when both LabelTotalQuantity.Text and DataCardValueTransp.Value do not change their value,  the recalculation takes place when the form changes its displaymode. 

 

The toggle is part of my datasource, I am not displaying its value from the datasource but I want to capture its value as calculated in PowerApp (I made it "view" mode for all form Display Modes).

 

LabelTotalQuantity.Text is calculated from several card values- which come in their turn from the datasource. DataCardValueTransp.Value comes from the datasource (or from user action inbetween). 

 

I see that the value recalculates every time I change one of the card values, like Excel, and this is normal and expected. But when nothing changes? And why on the DisplayMode change? Thanks!

Hello, does anybody have any idea why I am experiencing such a behavior, when nothing in my fields changes? Many thanks for your help!

If you ever reach this post...I have raised the question with Microsoft, below is their statement. So solution should be available in the future.

 

“There are a few controls whose OnChange rule runs whenever data changes (on initialization, on items change, on default value change, on user interaction); these are ComboBox, DatePicker, Slider, and Toggle. All other controls only run their OnChange rule on user interaction.

 

To bring these controls into line with the remaining controls, we are planning to add a preview flag to the settings page to enable strict onchange handling.”

 

 

Hi Valeria,

 

Thanks for your sharing. I face the same issue. What was your workaround while waiting the solution by Microsoft?

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