How to Set Default Calendar Name in Dropdown

[Phineas]

I want a Dropdown to default to a shared group calendar from Outlook. I can currently see and access all the calendar options.

I need the Dropdown to 'default' to the desired Outlook calendar with the app/screen opens, causing the Calendar and the event, time and location fields to open, also.

Currently the user to choose from the list in the Dropdown before any of the other controls or fields appear.

The default calendar should be 'Truck Service Schedule Live'. When I manually add the desired calendar in the default and save, publish and open the app, the desired calendar is not the default on open.

I will set the Dropdown DisplayMode to 'Disabled' to prevent users from changing the calendar once this is resolved. 

Dropdown Properties -
Default: "Truck Service Schedule Live"//_myCalendar.DisplayName
Items: Office365Outlook.CalendarGetTables().value
OnChange: Select(dropdownCalendarSelection1)
OnSelect: If(IsBlank(_userDomain),
UpdateContext({_showLoading: true});
Set(_userDomain, Right(User().Email, Len(User().Email) - Find("@", User().Email)));
Set(_dateSelected, Today());
Set(_firstDayOfMonth, DateAdd(Today(), 1 - Day(Today()), Days));
Set(_firstDayInView, DateAdd(_firstDayOfMonth, -(Weekday(_firstDayOfMonth) - 2 + 1), Days));
Set(_lastDayOfMonth, DateAdd(DateAdd(_firstDayOfMonth, 1, Months), -1, Days))
);
Set(_calendarVisible, false);
UpdateContext({_showLoading: true});
Set(_myCalendar, Self.Selected);
Set(_minDate, DateAdd(_firstDayOfMonth, -(Weekday(_firstDayOfMonth) - 2 + 1), Days));
Set(_maxDate, DateAdd(DateAdd(_firstDayOfMonth, -(Weekday(_firstDayOfMonth) - 2 + 1), Days), 40, Days));
ClearCollect(MyCalendarEvents, Office365Outlook.GetEventsCalendarViewV2(_myCalendar.Name, Text(_minDate, UTC), Text(_maxDate, UTC)).value);
UpdateContext({_showLoading: false});
Set(_calendarVisible, true);

[BCBuizer]

Hi @Phineas ,

It seems there's a lot of variables being set by selecting the dropdown. Are those also set when initialising the app? If not, you might want to add a Select(YourDropdown) command to the OnStart property of your app so the user doesn't have to.

[Phineas]

No, those variables are not also intiaited at AppStart.

Most of the formuals you saw are OOTB Microsoft template calendar code.

I don't understand your instruction regarding 'Select(YourDropdown)' recommendation, please clarify.

[BCBuizer]

Hi @Phineas ,

When clicking on App in the tree view and then selecting the OnStart property, you can triggering functions that are executed when the app is starting:

Inserting Select(YourDropdown) (change YourDropdown with the identifier of the dropdown used to select the calendar) will trigger the OnSelect property of the dropdown as if the user were clicking it, initialising all of the variables as defined in there. 

[Phineas]

Power Apps didn't like you suggestion.

The error messages are -
Select of a contnrol that is not on this screen. (though you can see it clearly see it).
The function 'Select' has some invalid arguments.
'Select' cannot be used in a proper of the app object.

[BCBuizer]

Hi @Phineas ,

In that case, can you add it to the OnVisible property of the screen that has the control in it?

[Phineas]

When I start a new application this is what defaults to the screen.

The default in the dropdown is as desired with "Truck Service Schedule Live" hard-coded into the Dropdown 'Default' property.

However, the above does not activate the auto-populate of the Calendar and events fields, controls, or content.

If I open in 'Edit' and change the Dropdown to 'Edit' and manually select "Truck Service Schedule Live" everything works fine, and I can navigate back and forth between other screen and return to this screen with the Calendar in the same default state.

The only issue is how to get the the other controls to recognize the default content of the Dropdown as "Truck Service Schedule Live" and display the events and other content associated with that calendar - by Default at OnStart.

I placed 'Select(CalendarSelectionDropdown)' in the Screen OnVisible.

[BCBuizer]

Hi @Phineas,

I tried to use the select with a button and that initiated the calendar instantaneously:

What is happening, I think, is that in the PowerApps studio, you are not triggering the OnVisible property. Please try again by adding a random button on any other screen but the CalendarScreen with Navigate(CalendarScreen) as the OnSelect property. I think you'll see this workaround is actually working.

[Phineas]

I believe you; However, I need it to work at OnStart, without user intervention.

Is it your conclusion that a button is 'required' to initiate this action?

That there is no way to set the default of the Dropdown to the desired text automatically at OnStart, and the other calendar controls and fields respond to that action and content?

It seems to me that these two formulas (in the OnSelect of the Dropdown), are playing a role in the issue.

Is there no way to update the below so that it ONLY returns the 'Truck Service Schedule Live' calendar title, so that the ONLY title the user sees it ''Truck Service Schedule Live'?

Set(_myCalendar, Self.Selected);
ClearCollect(MyCalendarEvents, Office365Outlook.GetEventsCalendarViewV2(_myCalendar.Name, Text(_minDate, UTC), Text(_maxDate, UTC)).value);

[BCBuizer]

Hi @Phineas ,

What I'm saying is that adding the formula to the OnVisible property of the CalendarScreen will achieve your goal of initialization without user intervention. The button was only added to trigger the OnVisible property in PowerApps Studio.

In case you want the dropdown to only display the 'Truck Service Schedule Live' calendar, then what's the point of the dropdown? In that case you might as well configure the whole app to be static.