ListBox is empty after every 2nd selection of ComboBox

[Marty3012]

Hi, I have a ComboBox that connects to a SharePoint List Column (Single line of text). Every time I select an option from the ComboBox the ListBox below will show values from another Column (Lookup) in the same SharePoint List. The first time I make a selection in the ComboBox it returns the correct items in the ListBox, but for every second selection I make the ListBox is empty. Below image shows that the 2nd selection is always empty. I've tried using 'On Change', 'Reset' etc but cant fix the issue. I've not provided detailed code as I was hoping this could be a known issue in one of the settings. Any help appreciated, thanks.

[BCBuizer]

Hi @Marty3012,

Can you please share the Items property of the List Box?

[Marty3012]

Hi. I've worked out why it is acting the way it is. When I delete the current selection and then select another option in the combobox the correct items then appear in the list box;

Consequently what I would like to do is when I select the Combobox the current selection is automatically removed so that the next selection has the correct items in the listbox. I think if this is not possible users would not know to delete the current selection in order for it to work correctly.

The items code is below. Basically it pulls in values from the SharePoint look up column and displays them correctly in the listbox.

With(
{
sizesString: Concat(
Gallery1_1.Selected.Dependencies,
Value,
" ,"
)
},
With(
{
sizesFormatted: Mid(
sizesString,
1,
Len(sizesString)
)
},
Split(
sizesFormatted,
","
)
)
)

[v-qiaqi-msft]

Hi @Marty3012,

Glad that you have resolved your problem.

Mark your reply as an answer to help more users.

Thanks for your cooperation.

[Marty3012 · Accepted solution]

Since I was populating the ComboBox with a Gallery I worked out what i needed to do was set the 'OnSelect' for the ComboBox to 'Reset(GalleryName)'. This means as soon as I select an option in the ComboBox it clears the current selection in the Gallery and updates the ListBox accordingly.