Filter Dropdown for Related Items

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Posted on by Phineas

5,325 Super User 2025 Season 2

I have Dropdown1, which is getting data from List1.

Two columns in List1 are 'Load Number' and 'Customer'.

The Dropdown1 content is a list of 'Load Numbers'.

Once the user makes a choice Dropdown1 the list should update so that
it shows ONLY other 'Load Numbers' where the 'Customer' matches.

How can I achieve this task? .

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WarrenBelz 153,059 Most Valuable Professional on at

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@Phineas,

Another rather unusual request I see. You want a drop-down to self-adjust after a selection has been made. You have not posted how 'Load Number' and Customer relate in the 'Load Numbers' list, but for the purpose of this exercise, I will I assume both columns are there (if not you cannot achieve any filtering).

Firstly put this at screen OnVisible - you will also need to anywhere you need to reset the drop-down.

UpdateContext({varItem:Blank()})

Now the Items of the drop-down
If( IsBlank(varItem), 'Load Numbers'.'Load Number', With( { _Item: LookUp( 'Load Numbers', 'Load Number' = varItem ).Customer }, Filter( 'Load Numbers', Customer = _Item ).'Load Number' ) )

and the OnChange of the drop-down
UpdateContext({varItem: Self.Selected.'Load Number')

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Phineas 5,325 Super User 2025 Season 2 on at

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Edited Reply:

To your question - "You have not posted how 'Load Number' and Customer relate in the 'Load Numbers' list,".

The 'List' (collection) is Scheduling. Both columns are in this Scheduling list.

The ComboBox is bringing in the 'Tag_Number' column content data.

At screen visible the ComboBox list should contain ALL 'Tag Numbers'.

Once a 'Tag Number' is chosen the ComboBox list should update to show
ONLY other 'Tag Number's where the 'Customer' is the same as the first 'Tag Number' chosen.

I tried your formula and got error messages about the varItem not being recognized.

Got error - "Name isn't valid. 'varItem' insn't recognized."

Switched back and forth between screen, to trigger 'OnVisible'
action, no change.

Screen OnVisible -

UpdateContext({varItem:Blank()})

ComboBox Items -

If(

IsBlank(varItem),

col_Scheduling.Tag_Number,

With(

{

_Item: LookUp(

col_Scheduling,

Tag_Number = varItem

).Supplier

},

Filter(

col_Scheduling,

Supplier = _Item

).Supplier

)

);

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WarrenBelz 153,059 Most Valuable Professional on at

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@Phineas,
As you have confirmed the solution, I assume you have worked out that

the last reference in the formula needs to be .Tag_Number not .Customer

you need to set the OnVisible first so you do not get the error when you write the rest of the code.

you have not included the OnChange code I posted

I have tested what I posted on a model and it works here as expected.

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