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Filtering Combo Boxes to only show items not selected by other combo box

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Posted on by ChrisSouthgate

I'm currently testing a solution and I am struggling to configure the combo boxes.
I have created a collection 'ColControlsChoices'
I have ComboBox1 and ComboBox2. These both show the same choices from ColControlsChoices.
I want to configure them so that if Items are selected in one ComboBox the options are not available in the other ComboBox.
What is the correct syntax for achieve this?

Thanks in advance,
Chris

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Building Power Apps

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Rajkumar_M 3,741 Super User 2025 Season 2 on at

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Hi @ChrisSouthgate

You can accomplish this by utilizing the collection function.

Combo Box 1 OnChange Property:

ClearCollect(
cmbofil,
Filter(
ColControlsChoices,
!(ComboBox1.Selected.Value in Columnname)
))

Combo Box 2 Item Property:

cmbofil

Thanks!

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ChrisSouthgate 16 on at

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That worked perfectly. Thank you.

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Rajkumar_M 3,741 Super User 2025 Season 2 on at

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You want to avoid using a collection; consider this alternative approach.

In Combo Box 2 item:

Filter(
ColControlsChoices,
!(ComboBox1.Selected.Value in Columnname))

Thanks!

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BrunoTw 15 on at

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You can also accomplish the same using below logic.

ComboBox1 > Items: ColControlsChoices ComboBox2 > Items: Filter(ColControlsChoices,!(ThisRecord in ComboBox1.SelectedItems))

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