Gallery Default property type/format?

[lifelongjourney]

Hi there,

I'm working on an on call roster app. Users will see who is rostered on call this week, as well as previous and future entries in the roster.

I want to implement this as a gallery. I want to use the Default property of the gallery to set the displayed gallery item. This is so that the initial scroll position of the gallery will be at today's on call duty, and the user can scroll up or down to see adjacent entries. The problem I've encountered is, I can't figure out how to set the value of the Default property.

The Gallery control properties documentation doesn't say which which type it uses, nor does it give an example situation using this property.

In fact, I wouldn't have even known this was the correct property to use, had it not been for this forum post - https://powerusers.microsoft.com/t5/PowerApps-Forum/Gallery-Scroll-to-a-Default-Item/m-p/4558/highli... . However, the method suggested in the post leaves the type and/or format of a Default property value opaque to the user.

How can I set the value of a gallery's Default property?

[bdc604]

Even when clearing the collection, I cannot get Powerapps to select the first Gallery item in a custom view form by default when closing the view form and selecting a different list item. It fires once, the very first time, then nothing when I go to other list items.

Gallery1.Default = First(Collection1)

I tried Screen1.OnHidden = Clear(Collection1) but that didn’t help.

Any suggestions? Perhaps in SP vs stand-alone apps the custom form is never truly hidden, just collapsed out of view, and OnHidden doesn’t get triggered properly?

Whats the point of a Default property if you need to wire up a button to set it? In tha case I would just manually select the first item...