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Multi select combo box clear other values if "none of the above" selected

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Posted on by RoarkeP

Hello! I have a multi-select combo box and want to clear all other values if "None of the above" is selected. I have come close with:

ComboBox.OnChange

If("None of the above" in ComboBox.Selected.Value, UpdateContext({varNoneAbove:true}); UpdateContext({varNoneAbove:false}))

Can I update the values in a multi select combo box within the .OnChange of that same multi select combo box?

Any ideas? Thanks in advance!

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WarrenBelz 153,415 Most Valuable Professional on at

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Hi @RoarkeP ,

You are only setting a Variable here (not clearing anything), but the code would be on the OnChange

UpdateContext( { varNoneAbove: Self.Selected.Value = "None of the above" } )

What are you then trying to update?

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RoarkeP 14 on at

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Thank you for responding!

Multi-select combo box
Choices are pulled from a SharePoint list ("A", "B", "C", "D", "None of the above")
When users selects "None of the above" I want to remove any other values also selected ("A" - "D")
When I put your code in the OnChange property of the DataCardValue, the "=" causes an error:

Do you need to know more to suggest other ideas?

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WarrenBelz 153,415 Most Valuable Professional on at

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@RoarkeP ,

Firstly, you must have the Variable varNoneAbove already defined as another data type - I tested the syntax here and it worked fine. If you simply want to reset the control, do this OnChange

If( "None of the above" in Self.SelectedItems.Value, Reset(Self) )

Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

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RoarkeP 14 on at

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How do I have the Variable varNoneAbove already defined as another data type? When I put the syntax above in the OnChange of the control, it errs as follows:

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WarrenBelz 153,415 Most Valuable Professional on at

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@RoarkeP ,'

You did not say you were using DataVerse - I assumed SharePoint.

I am not a DV user, but you might look at what the valid output of ComboBoxName.Selected.Value is.

Also this blog may be of assistance.

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RoarkeP 14 on at

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Ah yes - DataVerse indeed - The blog is useful theoretically but was not enough to resolve my issue. Thanks for all the input!!

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v-xiaochen-msft on at

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Hi @RoarkeP ,

I did a test for you.

1\ This is my column 'Test10' in table 'Test 66S' . It's a Choices column.

2\ Add a combo box control 'ComboBox1' and set its Items property to:

Choices('Test 66S'.Test10)

Set its Onchange property to:

If("None of the above" in Concat(ComboBox1.SelectedItems.Value,Text(Value),","),Reset(ComboBox1))

3\ The result is as follows:

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.

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RoarkeP 14 on at

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Hello - thanks for the input - I believe both solutions are working for both of you. However, there may be something wrong with my setup/environments because they still are not working for me.

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v-xiaochen-msft on at

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Hi @RoarkeP ,

Could you provide details?

Best Regards,
Wearsky

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Community Power Pla... on at

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@v-xiaochen-msft I was able to get my combo box working per your example expression. One issue I ran into was when I choose "None of the above" it clears that selection also... I'd like for users to be able to at least make that selection. Any ideas on making that happen?

Here is what I have:
If( "None of the above" in Concat( cmbBusinessBenefit.SelectedItems.Title, Text(Title),", "), Reset(cmbBusinessBenefit))

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