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Show only checked items from gallery, in a Preview screen gallery

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Posted on by Iantaylor2050

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I have a powerapps gallery with checkbox on each row. Once user clicks the preview button, it should take me to the next screen with the same gallery, but it should show only the selected items.

All the unselected one should be hidden in Preview screen. Any idea how to achieve this? Screenshot included below.

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Building Power Apps

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NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @Iantaylor2050 ,
OnCheck property of checkbox you can use -

Collect(colPreviewData, ThisItem)

You can use below formula in UnCheck property of checkbox -

Remove(colPreviewData, ThisItem)

You can use this collection in Items property of your preview gallery -

colPreviewData
Iantaylor2050 603 on at

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Hi @NandiniBhagya20

Thanks. The above code works. However if i comeback from the preview screen to the previous screen, the items which i checked already appears as unchecked. Can let me know how to preserve the checked items in first screen?
NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @Iantaylor2050 ,
We will have to make some changes the code -
In App OnStart property you can put all data of your list in a collection -

ClearCollect(colListData,AddColumns(SPListName,"checkBoxVal",false))

OnCheck property of checkbox -

UpdateIf(colListData, ID=ThisItem.ID, {checkBoxVal:true})

OnUnCheck property of checkbox -

UpdateIf(colListData, ID=ThisItem.ID, {checkBoxVal:false})

Items property of Gallery where checkbox is added -

colListData

Items property of gallery where you would like to show checked in items -

Filter(colListData, checkBoxVal = true)

If you want to clear the checkboxes, use below formula in OnSelect property of a button -

UpdateIf(colCheckBoxTestN, true, {checkBoxVal:false})
Iantaylor2050 603 on at

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Hi @NandiniBhagya20

I tried the above code. Still when I come back from preview screen to the previous screen, suddenly the checked items checkmark disappears intermittently. It should preserve all the checked items in the previous screen
NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @Iantaylor2050 ,
It should work.
Can you check checkBoxVal column values in the collection colListData.