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How to remove Items from collection on Uncheck and add on check using CheckBox in Gallery and add row numbers depending on items in collection?

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Posted on by Tapesh

825

Hi Experts,

I have been trying to use the check box to get certain data when the user selects a specific Item and add them to the collection, however, while doing so it adds the records to the collection, but does not remove when a user selects, in fact, it only removes the item from the collection which was last added.
Please find the screenshot below

But the items are unchecked

when I tried to add another 3 items and remove them only one was removed i.e. last entry, rest are not removed, any idea why is this happing?

Final result

The code onCheck :

Set(
 varSequence,
 CountRows(ExportDataGal.AllItems)
);
Collect(
 ExportData,
 {
 unique_id: varSequence,
 data: ThisItem
 }
);

The code on UnCheck :

Remove(ExportData, 
 {
 unique_id: varSequence,
 data: ThisItem
 }
);

Could you please help on this if anyone has any idea what's wrong or missing something.

Thanks a million for taking the time to read and help.

Categories:

Building Power Apps

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@Tapesh

Firstly, I think you need to adjust your OnCheck to this

Collect(
ExportData,
{
unique_id: varSequence+1,
data: ThisItem
}
);

Then, your OnUncheck could use this

RemoveIf( ExportData, unique_id = ThisItem.unique_id)

I'm posting this on my iPad so cannot test it but think that should work?

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zmansuri 6,048 Super User 2024 Season 1 on at

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Uncheck:
Remove(CollectionName,ThisItem)

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Tapesh 825 on at

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Hi @Anonymous ,

I tried your way but it did not work , I modified it but same the error,

However, I tried this but it's removing all the selections not the just one with the Uncheckmark,
RemoveIf( ExportData, unique_id exactin ExportData.unique_id);

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Tapesh 825 on at

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Hi , @zmansuri

Yeah, this one works fine for normal but I also have come additional data which I'm adding to the collection while on check and Uncheck but seems like it does not work for Uncheck only.
Any idea why is it so ?

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@Tapesh

Sounds like some other code is also firing at the same time, what is the full OnUncheck code and do you have any code in the OnSelect of your gallery? If so, post that as well

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Tapesh 825 on at

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Hi @Anonymous

Please see the code below I do not have any other code than this one .
OnCheck
OnUncheck

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yashag2255 24,769 Super User 2024 Season 1 on at

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Hi @Tapesh

You can use the configuration as below:

OnReset or OnVisible -> Clear(CollectionName)

OnCheck: Collect(CollectionName, {Identifier: ThisItem.ColumnName, data: ThisItem})

OnUncheck: RemoveIf(CollectionName, Identifier= ThisItem.ColumnName)

Here, you have to replace ColumnName with the name of column which stores unique values in the gallery.

Hope this Helps!

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!

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Tapesh 825 on at

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Hi @yashag2255

Thanks for the reply but seems like it is same solution which was provided by @Anonymous in last reply, sorry to say but it does not work for me as I am using a variable and adding the to collection. could you please help with any other way just in a away where I can create an auto-increment number starting from 0 and end at the last item in the collection. like Sequnece 0, 1, 2, 3, 4, 5. Would be a great help as I can play around then if I get the auto-increment number whe user add the item to the collection and remove vice-versa.

Thanks

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@Tapesh

What is the Items property of your Gallery ie how is it built? Currently, there isn't a relationship between the Gallery and the Collection which is why you cannot manage the deletion of records. We need to create a relationship to be able to do what you are wanting to do.

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@Tapesh

For example, if your Gallery is coming directly from SharePoint then you already have a 'unique_id' you can use ie the ID of the items. So, you can simply just use this is the OnCheck & OnUncheck

// OnCheck Collect( ExportData, ThisItem) // OnUncheck Remove(ExportData, ThisItem );

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