PowerApps How can I disable and enable different dropdowns based on different listbox items selected

Question

I have a listbox in PowerApps and I need to enable different dropdowns based on each selection of listbox item. I have one dropdown for each listbox items.

I tried the following code on my dropdowns, but it doesn't work and give error *, + is expected at this point in formula

below is the formula I wrote in DisplayMode of the dropdowns:

ForAll(ListBox1_1.SelectedItems, If(ThisRecord.Name="Offce ABC",DisplayMode.Edit,DisplayMode.Disabled));

Answer 1

There are a few ways of doing this depending on how your Dropdown Items are setup.

Assuming...

1. There is somekind of relationship between the Items in the Listbox and the Items in each Dropdown
2. Each Dropdown Items is a Collection (or a filtered part of a Collection)

...you can use the following logic for the DisplayMode property of the Dropdowns:

If(
    IsEmpty(
        Filter(lbox1.SelectedItems, Value in col1.field)
    ),
    DisplayMode.Disabled, 
    DisplayMode.Edit
)

Example in action:

Answer 2

Again, there are a few ways of doing this depending on how your Dropdown Items are setup.

Assuming now...

1. There is NO relationship between the Items in the Listbox and the Items in each Dropdown

...you can use the following logic for the DisplayMode property of the Dropdowns:

If(
    Or(
        "1" in lbox1_1.SelectedItems,
        "2" in lbox1_1.SelectedItems,
        "3" in lbox1_1.SelectedItems
    ),
    DisplayMode.Edit, 
    DisplayMode.Disabled
)

...where "1", "2", etc. are the options in the Listbox Items property.

Example in action: