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chris421
Helper I
Helper I

How to stop a Gallery resetting when datasource refreshes?

Afternoon

 

I have an app that I'm working on that loads in rows of data from an SQL DB - let's say 100-200 rows. I have a timer set to refresh the data regularly so that it's as up-to-date as possible for the app admins to review. The users scroll down the list, checking details, and occasionally making an adjustment. However, if they are just scrolling down the list and reviewing rows, they get maybe to row 75, before the refresh....at which point the data refreshes and the gallery resets - so they are no longer at row 75...it's not usually the top of the gallery, but somewhere between row 1 and 75.

 

What I'd like is to be able to refresh the data regularly, but the gallery stays at the point its currently sitting at when the refresh takes place.

 

Is this possible? Anyone any ideas how to freeze the gallery in place?

 

 

Thanks,

Chris

6 REPLIES 6
AmDev
Super User
Super User

Hi @chris421 

 

Try adding this to the default property of your gallery:

 

{}

 

Hope this helps

Gerard

chris421
Helper I
Helper I

Hi @AmDev

 

Unfortunately, that doesn't seem to have changed anything...it's still moving the gallery current position; although I'm noticing its only if i'm further down than the item it seems to reset to.

For example; if it's resetting to item 100 (I'm not sure which item it is exactly compared to the full gallery of data)....if I'm reviewing around 50/60 etc, then it stays where it is.....but if i'm review rows further down than 100, then it resets back.

 

Chris

chris421
Helper I
Helper I

Little update....I did a bit more testing, and have managed to ascertain that it's resetting to row 100 (so that row 100 is the last row visible in the gallery) - that's why when I'm above this row, nothing happens, but when I'm further down the gallery, it moves.

 

The issue is going to be that, once in use, there could be around 500 rows of data in the table to be reviewed before processing. I don't really want a user getting to row 400 and then the view resetting to 100, and them having to almost start again.

I can't really extend the timer too much, as I don't know how long it would take to review the data.

I suppose I could make the refresh manual (as a workaround), but I really don't like the idea that the reviewing user could be viewing out of date data...automated refresh is far preferred.

WarrenBelz
Most Valuable Professional
Most Valuable Professional

Hi @chris421 ,

One option which may suit you (although it has another effect)  and you need a unique identifier for this - OnSelect of the gallery (the user has to select the record for this to work)

UpdateContext({varID: ThisItem.YourIdentifier})

then the Default of the Gallery

LookUp(
   YourTableName,
   YourIdentifierName = varID
)

The effect I refer to is that immediately on the selection, the item chosen will move to the top of the gallery, however it will also stay there when the gallery is refreshed.

 

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Hi @WarrenBelz 

 

Thanks for the suggestion. I've given this a shot and, when an item is selected, it's going straight to the top of the gallery as anticipated - which is something I could have worked round. However, on refresh, the gallery is still resetting to the point where item 100 is at the bottom of the gallery; so, it seems to be ignoring the fact the it's default is set to a specific item if the selected item is over 100.

 

It would've been ideal to have the gallery stay still during a refresh (and could be quite handy for other apps using larger datasets). However, for this app, I've since spoken to the users that will be using the app, and I think i'm going to manage to do the "admin review" gallery without the need for an auto refresh after all - the data feeding this gallery won't be getting updated live by the time they actually review it (it'll be admin updates only)....so this should mean that I only need to account for the records they update, rather than the full gallery/data source refreshing.

 

 

Chris

WarrenBelz
Most Valuable Professional
Most Valuable Professional

Hi @chris421 ,

That sounds like a better idea - my suggestion was a bit of a workaround anyway

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