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PowerApp with multi-select choice fields that have same options - cannot select same option in more than once field

Hello,

I am hoping to make a PowerApp off of a SharePoint list. They idea is for students to select the classes they plan to take in each semester.

 

There will be several multi-select choice fields where students select all the classes they plan to take in a given semester. Each of those choice field should have the same options. However, if a class is selected in choice field one, then that same class cannot be selected in choice field two or three. If a class is selected in choice field three, then that same class cannot be selected in other choice fields. Basically students should only be able to select a given class once on the entire form.

 

I am open to lookups or other ideas for how to accomplish this.

 

 

1 ACCEPTED SOLUTION

Accepted Solutions

Try using a collection for your classes and then the items in your combo boxes would be filtered to exclude the items selected in the other comboxes.

 

In my sample I loaded the initial data (list of classes) in the button on select:

ClearCollect(colClasses,["Class A", "Class B","Class C","Class D"]);

 

I set combox1 items to the colClasses, pending how you implement you will probably want to filter this combo box as well to exclude the items selected in the other combo boxes.

 

ComboBox has it items set to

Filter(colClasses,Value <> ComboBox1.Selected.Value)

 

For each additional combo box, just add an additional 'And' clause in your filters so those selections are excluded as well. And as mentioned above, update combo one so its also filtered to exclude the selections in the other combo boxes.

 

ComboBox Filtered.png

 

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5 REPLIES 5

Try using a collection for your classes and then the items in your combo boxes would be filtered to exclude the items selected in the other comboxes.

 

In my sample I loaded the initial data (list of classes) in the button on select:

ClearCollect(colClasses,["Class A", "Class B","Class C","Class D"]);

 

I set combox1 items to the colClasses, pending how you implement you will probably want to filter this combo box as well to exclude the items selected in the other combo boxes.

 

ComboBox has it items set to

Filter(colClasses,Value <> ComboBox1.Selected.Value)

 

For each additional combo box, just add an additional 'And' clause in your filters so those selections are excluded as well. And as mentioned above, update combo one so its also filtered to exclude the selections in the other combo boxes.

 

ComboBox Filtered.png

 

 This worked great! Thank you!

 

Do you know if there is any way to filter the combo boxes in reverse? Or, to set up some logic that does not allow students to select the same class as is used in another combo box? My concern is that students will skip around the dropdowns, and select a class first in combo box 2, then go back and select in combo box 1 as well. 

 

The filter does not allow you to reference fields that are already referencing that field.

Glad it works for you. I think the simplest solution would be to add a little logic around the display mode properties of each combo box. Your first combobox's display mode could DisplayMode.Edit. Your 2nd combox could be something like:

If(!IsBlank(ComboBox1.Selected), DisplayMode.Edit, DisplayMode.Disabled)

 

And then Combobox2's display mode would be:

If(!IsBlank(ComboBox1.Selected) And !IsBlank(ComboBox2.Selected), DisplayMode.Edit,DisplayMode.Disabled)

 

Always forcing them to fill out in order.

Another good idea! Thank you for taking the time to think about solutions to this. I'm going to run it my faculty to see if they think that will work.

Hey @cmyoung07 - I started a new thread on a separate issue I am having with the same app. It's related to the collection field. Sharing a link in case you have any ideas on that one too:

Store multiple selected value of combo box in to S... - Power Platform Community (microsoft.com)

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