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How to populate Gallery Dropdown based on previous rows

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Posted on by luissimoespt

Hi Everyone,

I have a gallery with a template that is being used to input records ( kind of a parent-child approach ).

In this template I have a dropdown box to select a product... I want to avoid that the product selected is one of the previous ones selected.

To achieve this I tried to play around with the onChange, Items and Default property of the dropdown where my logic was:

- OnChange ( update the "selectedproducts" collection with item selected )

- Items ( Repopulate Dropdown with all products except the ones in the "selectedproducts" collection )

- Default ( get product based on item selected since this will need to play around with another gallery - the parent )

This seems to work fine sometimes and another times it does not work correctly. It appears to me that it has to do with the time that the onchange takes to update the collection and the default action trigger still catching the previous value)

How would you guys tackle this?

Thank you

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Drrickryp Super User 2024 Season 1 on at

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@luissimoespt

In the OnChange property of Combobox1 (a multiselect combobox):

Filter( ShowColumns( Sort( yourtable, yourfield ), "yourfield" ), IsBlank(_items) || !(yourfield in _items) )

and in the gallery items property:

Filter( yourtable, IsEmpty(ComboBox1.SelectedItems) || yourfield in _items )

If you want to use Distinct for yourfield, then the formulas would be

Filter( ShowColumns( Sort( Distinct(yourtable,yourfield), Result ), "Result" ), IsBlank(_items) || !(Result in _items) )

and for the gallery:

Filter( yourtable, IsEmpty(ComboBox1.SelectedItems) || Result in _items )

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luissimoespt 57 on at

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Hi Drrickryp,

My goal is not filtering the gallery items.
The objective is not allow the user to selected an element from the gallery row dropdown that was already selected in other rows...

Possible dropdown values are 1,2,3,4

Gallery Rows Example:
ROW 1 - DropDown Value = 1
ROW 2 - DropDown Value = 3
ROW 3 can only now select between 2 and 4

This is working on my case, but sometimes the dropdown freaks out and starts switching between two items.
I believe its due to the timing of updating collections vs refreshing the controls

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