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Detail Form does not work - errors with Gallery.Selected

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Posted on by J_Taylor

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I am building my first app which was based mainly from a single SharePoint List called "Student List". This was created using the automated process.

I have had few issues with the Gallery page, but I when I went to edit the Detail page, it was broken. I have tried to look everywhere for solutions, but I have not found anything to help with the problem. My main resource that I have been trying to follow is Understand canvas-app forms - Power Apps | Microsoft Docs.

My problem: the 'Item' on the DetailForm should be 'Gallery.Selected'. However, I get an error. I have tried to attach any images that might be useful.

Image 1 - Gallery View:

- The gallery is called "Gallery".

- The arrow to the next page has a function to navigate (as shown).

- I previously tried making the arrow "Select(Parent)" with no success (I don't know what is correct, just that the 'Understand canvas-app forms' documentation say do 'navigate').

Image 2 - Detail View:

- The form function for the Item is "Gallery.Selected". This comes up with an error stating: "Invalid formula: expected a value compatible with 'Datasource'".

- The Datasource can be seen. It is the same as the Filter function from the ListSearch.

- I have also tried [@'Student List'] for the Datasource.

Any help or advice would be greatly appreciated. I apologise that I am quite new to this and one may need to 'dumb it down'.

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Building Power Apps

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zmansuri 6,048 Super User 2024 Season 1 on at

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It's not a good practice to use Gallery.Selected, do this:
Set your gallery's OnSelect:
Set(varRecord,ThisItem)
Set your form's item property:
varRecord
J_Taylor 206 on at

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Zmansuri, thank you so much. You saved me hours more time spent on research.

As an optional question, why is the Gallery.Selected (and, I suppose the Parent(Select) with it?) 'bad practice'? Is it just because it doesn't work or is it actually 'wrong'?

Thank you, again!
zmansuri 6,048 Super User 2024 Season 1 on at

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Its not wrong. But as you see it sometimes work sometimes doesn't. So better not use it
J_Taylor 206 on at

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If I may ask another question (also optional):
In a card, how does the value work with the formula "Parent.Default"? The card has the default property of "ThisItem.Year" - which is understandable. Does "Parent" literally refer to the item it comes from?
zmansuri 6,048 Super User 2024 Season 1 on at

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Every field of databse has it's own data card. Parent is the datacard which that control is inside.
J_Taylor 206 on at

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Thank you so much for all of your help!
kaushalpatel257 on at

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Zmansuri, I have tried that out but when I select Edit or View Button then it shows 'No item to Display'. I was using Gallery.Selected in Items on Form Screen but as now I have changed and made new Gallery, it stops working now and giving me below error.