Combobox in gallery loses its value after patch

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Posted on by BaptisteW

124

Hi,

I'm making a canvas app in which I have a gallery containing many fields to fill, each of them has a combobox linked to a dataverse table.

I need to store the new value in a collection which looks like this:

colVehiclesToAdd:
 vehicle1:
 field1 ("alimentation"):
 value
 field2:
 value
 vehicle2:
 field1:
 value
 ...

...

So I wrote this for the OnChange of my combobox:

Patch(
 colVehiclesToAdd;
 ThisItem;
 {
 alimentation: Self.Selected.Name
 }
);;

However, the selected value of my combobox randomly gets cleared after the Patch(). I guess it's because I use colVehiclesToAdd as the Items property of my gallery.

Any idea what I'm doing wrong?

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Building Power Apps

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v-bofeng-msft on at

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Hi @BaptisteW ,

Please set the combo box's DefaultSelectedItems property.

If you don't know how to set it's DefaultSelectedItems property , please show me the combobox's items property.

Best Regards,

Bof

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BaptisteW 124 on at

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I tried to set the DefaultSelectedItems to First(Field_Alimentations) but it still doesn't work.
(Field_Alimentations being a dataverse table containing only a "Name" column, acting as a list of possible values. They are correctly displayed in the combobox choices)

Once I select a value, the attribute is correctly updated in my collection.

The flex gallery looks like this:

My combobox's OnChange method:
My combobox properties:
The updated collection:
My dataverse table:

Edit :
- My destination ("Parc") combobox isn't working, same problem BUT the patch doesn't update the collection at all when I set the DefaultISelectedtems property (it keeps the default value), which probably means that the current item in the gallery is reset
- Seems like the value is kept if I choose the same value for the 2nd time

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BaptisteW 124 on at

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Finally managed to fix this:

First, I had to wrap my Field_Alimentations dataverse table in a collection so that the combobox stops resetting the selection. Then, it would create a duplicate record when patching my collection with the updated field. To fix that, I had to use the Update() method instead of a Patch(). Idk why, but it seems like Patch()'s behaviour is stupid with collections.

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