Dynamically identify number of item in gallery list, and update Y value of other item based on this.

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Posted on by AN-31011359-0

Hi All,

I have a gallery ('MenuListGallery'). I have a search bar ('Search Bar') which filters the items in the gallery.

Let's say that the item titles of the list are the following:

etc.

In this case, item "C" is the 3rd item. If item "C" is selected, is there a way to identify the number "3", so that can be used to update a mathematical formula elsewhere?

And also, let's say that based on the search filter, items "A" and "B" temporarily disappear, and item "C" is now in the 1st position. Can the previously mentioned "3" dynamically update to "1", so as to dynamically update that mathematical formula?

Thanks in advance.

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VasileR 298 Super User 2024 Season 1 on at

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Hi @ashleynicholson ,

For your first question, getting the "3":
easiest way is to add an Index column to your source, and on a selection in the gallery, you now have the index of the selected item:
eg: MenuListGallery.Selected.Index

On a filtered gallery, you can get the first item with:
eg: First(MenuListGallery.AllItems).Title

Depending on what you want to achieve, it might worth a look at Flexible Height Gallery.

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AN-31011359-0 on at

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Hi,

Apologies if my question wasn't clear.

The number of items in the gallery will update dynamically based on the search filters that are present. So, an item could be Index #52 with no filters applied, but could move to #25 or #3 or any other position as the case may be. Is it possible to pull that dynamically changing number? Thanks.

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VasileR 298 Super User 2024 Season 1 on at

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You could try to build dynamically an indexed collection:
Clear(IndexCollection); ForAll(MenuListGallery.AllItems,Collect(IndexCollection,{Title:Title,Index:Value(Last(IndexCollection).Index)+1}));

Then, you can use it as you want:
eg:
LookUp(IndexCollection, Title = MenuListGallery.Selected.Title).Index -> returns 3 in your first scenario, when C is selected
if "A" and "B" have been filtered First(IndexCollection).Title -> returns "C" First(IndexCollection).Index -> returns 1

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