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Anonymous
Not applicable

Save the Gallery items position.

Hello, I am building an App where I have Models, and each model has it's operations.

What I am doing now is a Order button (Up and Down) that moves an Item up and down on a gallery (Switches position with the one above or below), but I have a problem.

 

If I delete an Item, what happens to the order?

 

Imagine I have 5 items, where the order goes: 1 2 3 4 5.

Then I deleted the third item in that column.

What happens is that number 3 gets deleted, so the order now is: 1 2 _ 4 5.

What I want to do is that the Order column ALWAYS stays the same.

Now, I don't want the order to be the same as SharePoint , because the items in SharePoint are not always in order. (I can create some operations for a Model, then create another operation from a different Model. The order can continue normally, but in SharePoint the Order gets interrupted by another Model's Order, for Example: Model A (1 2 3) Model B (1 2) Model A (3 4 5). I don't want that. And also, the order can be 2 3 4 7 1 5 6, and still work because it gets sorted on the Gallery.)

 

I tried to fix this with a Sequence, but that Overwrites the old positions, so if I have 2 1 3 4, it will be 1 2 3 4, but that will make everything back to default and will not save the position that the user had.

 

So my Idea is to save the Gallery's Order and Patch it on the SharePoint list using a ForAll and LookUp to patch on each Item, the position that it was on the gallery.

 

So Imagine the gallery had Items B D C A as the order. Being the Order 1 2 3 4, but In SharePoint is appears as 2 3 1 4. What I want is to overwrite in SharePoint the Order, WITHOUT changing the Order on the App. For Example: 

 

Go look for Item B in SharePoint. Found it? Good. Now make it's Order number be 1 (because in the gallery is 1). And so On. 

That will basically fix the problem where I delete an Item and It makes a Blank spot in the column (items are not in a equal progression, 1 3 4 5, suddenly jumps 2 instead of 1). Overwriting the Order in SharePoint based on the Gallery will remove that Blank spot.

 

I was trying to do that, but I can't reach to any conclusion, any help?

1 ACCEPTED SOLUTION

Accepted Solutions
metsshan
Super User
Super User

Hey @Anonymous,

 

I tried to interpret what you are looking for, and had a go at building it. Please let me know if this helps you work towards a solution, or if you need anything explained.

 

I can load a all the Operations of a Model in to a Gallery, they are sorted by "Order" column:

metsshan_0-1659449635054.png

I can reorder them, which updates the "Order" property on the SharePoint List:

metsshan_1-1659449668202.pngmetsshan_2-1659449681847.png

Every time an Operation is deleted, all "Order" properties are recalculated starting from 1, to fill in blanks:

metsshan_3-1659449740971.pngmetsshan_4-1659449751169.png

 

My Gallery Data source:

 

Sort(Filter('Model Orders', Model = drpModels.Selected.Result), Order, Ascending)

 

Up arrow OnSelect, swapping "Order" values with the previous Operation:

 

With(
    First(SortByColumns(Filter(galModels.AllItems, Order < ThisItem.Order), "Order0", Descending)) As Prev,
    If(
        !IsBlank(Prev),
        Patch(
            'Model Orders',
            ThisItem,
            {Order: Prev.Order}
        );
        Patch(
            'Model Orders',
            {ID: Prev.ID},
            {Order: ThisItem.Order}
        )
    )
);

 

Down arrow OnSelect, swapping places with the next Operation:

 

With(
    First(SortByColumns(Filter(galModels.AllItems, Order > ThisItem.Order), "Order0", Ascending)) As Next,
    If(
        !IsBlank(Next),
        Patch(
            'Model Orders',
            ThisItem,
            {Order: Next.Order}
        );
        Patch(
            'Model Orders',
            {ID: Next.ID},
            {Order: ThisItem.Order}
        )
    )
);

 

Trash can OnSelect, all "Order" properties are recalculated starting from 1:

 

Remove('Model Orders', ThisItem);
With(
    {ToUpdate: Filter('Model Orders', ThisRecord.Model = ThisItem.Model)},
    ForAll(
        ToUpdate As PatchTarget,
        Patch(
            'Model Orders',
            {ID: PatchTarget.ID},
            {Order: CountRows(Filter(ToUpdate As RecordForCount, RecordForCount.Order < PatchTarget.Order)) + 1}
        )
    )
);

 

 

A few thoughts:

  • I tried to speed things up a bit by replacing the actual List data source with Gallery.AllItems in the arrow key expressions
  • You might have issues if people press the arrows and/or delete too fast, but you could disable the controls while the operation is in progress, or do everything in a Collection and Patch the changes with a Submit button.

View solution in original post

6 REPLIES 6
metsshan
Super User
Super User

Hey @Anonymous,

 

I tried to interpret what you are looking for, and had a go at building it. Please let me know if this helps you work towards a solution, or if you need anything explained.

 

I can load a all the Operations of a Model in to a Gallery, they are sorted by "Order" column:

metsshan_0-1659449635054.png

I can reorder them, which updates the "Order" property on the SharePoint List:

metsshan_1-1659449668202.pngmetsshan_2-1659449681847.png

Every time an Operation is deleted, all "Order" properties are recalculated starting from 1, to fill in blanks:

metsshan_3-1659449740971.pngmetsshan_4-1659449751169.png

 

My Gallery Data source:

 

Sort(Filter('Model Orders', Model = drpModels.Selected.Result), Order, Ascending)

 

Up arrow OnSelect, swapping "Order" values with the previous Operation:

 

With(
    First(SortByColumns(Filter(galModels.AllItems, Order < ThisItem.Order), "Order0", Descending)) As Prev,
    If(
        !IsBlank(Prev),
        Patch(
            'Model Orders',
            ThisItem,
            {Order: Prev.Order}
        );
        Patch(
            'Model Orders',
            {ID: Prev.ID},
            {Order: ThisItem.Order}
        )
    )
);

 

Down arrow OnSelect, swapping places with the next Operation:

 

With(
    First(SortByColumns(Filter(galModels.AllItems, Order > ThisItem.Order), "Order0", Ascending)) As Next,
    If(
        !IsBlank(Next),
        Patch(
            'Model Orders',
            ThisItem,
            {Order: Next.Order}
        );
        Patch(
            'Model Orders',
            {ID: Next.ID},
            {Order: ThisItem.Order}
        )
    )
);

 

Trash can OnSelect, all "Order" properties are recalculated starting from 1:

 

Remove('Model Orders', ThisItem);
With(
    {ToUpdate: Filter('Model Orders', ThisRecord.Model = ThisItem.Model)},
    ForAll(
        ToUpdate As PatchTarget,
        Patch(
            'Model Orders',
            {ID: PatchTarget.ID},
            {Order: CountRows(Filter(ToUpdate As RecordForCount, RecordForCount.Order < PatchTarget.Order)) + 1}
        )
    )
);

 

 

A few thoughts:

  • I tried to speed things up a bit by replacing the actual List data source with Gallery.AllItems in the arrow key expressions
  • You might have issues if people press the arrows and/or delete too fast, but you could disable the controls while the operation is in progress, or do everything in a Collection and Patch the changes with a Submit button.
Anonymous
Not applicable

Hi @metsshan ,

 

Thank you for your explanation, exactly what I needed.

One question: What is PatchTarget and RecordForCount?

They are just aliases for the ForAll() and Filter() records respectively.

 

Without aliases you would end up with an ambiguous predicate expression of

"... Filter(ToUpdate, Order < Order) ..."

 

Edit, explanation: https://powerapps.microsoft.com/en-us/blog/formulas-thisrecord-as-and-sequence/ 

Anonymous
Not applicable

New stuff learned @metsshan,  thank you!

That was the error I was getting with my formula, I didn't have anything to evade that.

Didn't know I had things like that, I'm really new at this.

 

By the way, it worked! Thanks a Lot!

I'm glad it helped, I learned something new, too!

 

Next time, if you've already attempted some code it's always great to include that code in your original post, that way people might be able to help you faster.

Anonymous
Not applicable

Understood!

Thank you!! 😁

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