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Anonymous
Not applicable

Deleting row causes gallery to change to another selection

Hi,

 

I have a gallery (Gallery 1) that is filtered from the selection of a gallery (Gallery 2) on the previous screen. I have a button that deletes a row from the Gallery 1 (a sharepoint list row). The delete function works fine, but my Gallery 1 is reset to a different selection from Gallery 2. Below is a gif of it happening, notice how the row isn't just deleted but resent to a different data input.

 

ezgif.com-video-to-gif (1).gif

1 ACCEPTED SOLUTION

Accepted Solutions

@Anonymous 

Yes, this is the root cause.  You are changing the Orders list in your delete.  Since we have Grouping, Summing, etc. going on in that Items property, PowerApps will re-evaluate the statement and will lose its selected item.

I just replied to a similar issue in this post and you will read there that I mention all of the many conditions that can cause the selection to go away.

 

Now...in review of your GIF "video", the real issue is that you are referencing the first Gallery.Selected as the Items for your second Gallery.  And, as mentioned above, the first Gallery is going to change once you change the Orders datasource as it need to re-calc.

 

There are 2 tricks to resolving this:

1) is that you're going to need to use the Default property on the Gallery to "re select" the record.  How you can do this is through a dreaded variable.  When you select an item in the first gallery, you can use a variable to snapshot the ID of record you are selecting -  UpdateContext({lclSelectedID:ThisItem.ID})  Then, in your Default you can *repeat* the exact Items property of your Gallery in a LookUp based on the ID in the lclSelectedID variable.  If it is all exact, then the record will match and the item will be selected.  The disadvantage of it is that it moves the scroll position to the top - i.e. the Top record is selected, but at least it is the one you want.

Also in your scenario, this is going to cause a blip in the second gallery where it will change to the first item in your first gallery briefly and then will change to the selection you were once working on.  That is a little annoying and could actually delay enough that it would seriously confuse users.

 

2) Forget about firstGallery.Selected and instead set a snapshot variable on the selection.  Now in the post where we discussed the formula you are using for the Gallery, we dropped the "Items" column at the end.  We can actually use that column now.  So you can get rid of the DropColumns on the items column.  Now, in the OnSelect, you can set a variable, like - 

Set(glbItemList, thisItem.items) (note we're using Set because your other Gallery is on another screen, so we need global. This was not a concern in the #1 above because we just needed it on the first screen).

Then, set the Items property of the second Gallery to that variable - glbItemList

 

Now your second gallery should maintain it's list. HOWEVER, when you delete or edit an item, it is not going to change in the second gallery 😞

 

SO....what to do (and the reason I am going through all of these scenarios is to give you a better understanding of different ways to solve different situations)?  

 

Here is what you should have on your OnSelect of the first Gallery - Set(glbOrderNumber, ThisItem.Order_x0023_

Then on your Second Gallery, set the Items formula to:

Filter(Orders, Order_x0023_ = glbOrderNumber)

 

Now, your first gallery is still going to change when you change the Orders list, but now your second gallery is separated from it, so it will not be impacted when the first gallery changes.

 

I hope that all of this is informative and helpful and ultimate solves the problem you are experiencing.

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13 REPLIES 13
VijayTailor
Resident Rockstar
Resident Rockstar

Hi @Anonymous ,

Can you please describe the issue in more detail with the reference code?
But for Remove Rcord you can use like below code - 

Remove(Clollection/ListName,ThisItem);

and Please cross-check on the remove button you are not resetting the Parent gallery. Maybe that is the reason if you resetting.

Thanks,

Anonymous
Not applicable

@VijayTailor 
You have to watch the gif. The delete is not the problem, my gallery resetting to another item is

Anonymous
Not applicable

@VijayTailor 

Sorry, I didn't see the second half of your reply. below is the "OnSelect" formula. I don't have any resets in it. Could that be in another area?

 

Remove.PNG

Also, heres a picture of the Powerapps Monitor. The 'delereRow' is being followed by a 'getRows', which seems to putt a different set of rows than what i started with

remove 2.PNG

Hi @Anonymous ,

You can do one thing.
try like this
 ( Like - ThisItem, Not Galry.Selected)

See the reference below - 

Remove(TestAkshay,ThisItem)

RemoveIssue.gif

Thanks,
Vijay 
Please click "Accept as Solution" if my post answered your question so that others may find it more quickly. If you found this post helpful consider giving it a "Thumbs Up."

Anonymous
Not applicable

@VijayTailor 

It doesn't come as an option because I'm putting a (Yes/No) menu inbetween. Again, the delete function works fine, its just that it refreshes my gallery to a different item than I had originally entered after

Hi @Anonymous , 

 

You are trying to refreshing data source after row removed. Can you check plz, may that is also the reason of refresh gallary. 

Anonymous
Not applicable

I think I found someone with a similar problem. I might be able to make this work.

 

https://powerusers.microsoft.com/t5/Building-Power-Apps/Bug-Gallery-with-calculated-values-will-lose...

@Anonymous 

The reason your gallery is losing its selected item is because you are altering the underlying datasource that it is associated with.

The referenced posting you have will give you a workaround, but keep in mind that after that, referring to the Galleryx.Selected property will no longer be accurate.

You can certainly attempt to implement that or you can consider using the Default property of the Gallery to maintain the selection to a selected value.

_____________________________________________________________________________________
Digging it? - Click on the Thumbs Up below. Solved your problem? - Click on Accept as Solution below. Others seeking the same answers will be happy you did.
NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!
Anonymous
Not applicable

Hi @RandyHayes,

 

I'm looking into the Default section as a solution. I'm running into a problem though, the Default says its expecting a "Record" but I need a table of results to return in the Gallery

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