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KanwalNo1's avatar
KanwalNo1
Iron Contributor
May 15, 2022
Solved

Dependant Dropdown Using Dynamic Arrays

Hi Excel Gurus,

I am trying to create a Dependent Dropdown List using Dynamic Arrays. When we select a client name in Column R, then column S should contain list of only related holder names. I have used dynamic array formula in each cell of range G2:G6. I tried to use SEQUENCE to achieve the same result using formula in a single cell, but the formula used in Cell G10 is returning error message.

 

Though I was able to create dependent dropdown list in Column S, but request yours help on the following points.

 

1. Kindly help to identify the issue in formula in Cell G10

2. Why can't I use dynamic array formula in Validation box directly ? I am not able to use FILTER in Validation box to create a list.

3. Can LAMBDA help to achieve the result using a single formula for Column F and G, whereby it creates a unique list of Clients in Column F and Dependent holders list in Column G ?

4. Has someone came up with something unique to tackle such situation ?

5. Can Power Query be helpful here ?

 

Regards

Kanwaljit

Formulas and Functions
  • SergeiBaklan's avatar
    SergeiBaklan
    May 15, 2022

    KanwalNo1 

    What you try to generate in G10 that's array of array which is not supported by Excel, at least directly. There are different, but similar, techniques for workarounds. As variant, in your case it could be

    =LET(
    clients, UNIQUE(Table1[Client Name]),
    totalClients, ROWS(clients),
    holderName, LAMBDA(clientName,holders,clients,
        TRANSPOSE(FILTER(holders, clients=clientName)) ),
    fakeArray, LAMBDA(array, LAMBDA(array)),
    arrayOfFakeArrays, MAP( clients,
        LAMBDA(client,
        fakeArray( holderName( client, Table1[Holder Name], Table1[Client Name])))),
    result, MAKEARRAY( totalClients,9,
        LAMBDA(row,col,
            LET(getRow, INDEX(arrayOfFakeArrays,row,1)(),
                INDEX(getRow,1,col)))),
    IFERROR( result, "")
)

    You can't use arrays in data validation list, only ranges. More exactly references on them.

7 Replies

  • SergeiBaklan's avatar
    SergeiBaklan
    Diamond Contributor
    May 15, 2022

    KanwalNo1 

    What you try to generate in G10 that's array of array which is not supported by Excel, at least directly. There are different, but similar, techniques for workarounds. As variant, in your case it could be

    =LET(
    clients, UNIQUE(Table1[Client Name]),
    totalClients, ROWS(clients),
    holderName, LAMBDA(clientName,holders,clients,
        TRANSPOSE(FILTER(holders, clients=clientName)) ),
    fakeArray, LAMBDA(array, LAMBDA(array)),
    arrayOfFakeArrays, MAP( clients,
        LAMBDA(client,
        fakeArray( holderName( client, Table1[Holder Name], Table1[Client Name])))),
    result, MAKEARRAY( totalClients,9,
        LAMBDA(row,col,
            LET(getRow, INDEX(arrayOfFakeArrays,row,1)(),
                INDEX(getRow,1,col)))),
    IFERROR( result, "")
)

    You can't use arrays in data validation list, only ranges. More exactly references on them.

    • KanwalNo1's avatar
      KanwalNo1
      Iron Contributor
      May 15, 2022
      Dear Sergei,
      Most of the things you do, seems like magic to me 🙂
      Do allow me sometime to grasp the solution. You got my respect !
      Thanks a Lot !

      Can LAMBDA be used to produce the result in all the columns Including Unique Client List in First Column ?

      Regards
      Kanwaljit
      • SergeiBaklan's avatar
        SergeiBaklan
        Diamond Contributor
        May 15, 2022

        KanwalNo1 

        Yes, you may add it as first column making resulting array:

        =LET(
    clients,       UNIQUE(Table1[Client Name]),
    totalClients,  ROWS(clients),
    holderName,    LAMBDA(clientName,holders,clients,
        TRANSPOSE(FILTER(holders, clients=clientName)) ),
    fakeArray,     LAMBDA(array, LAMBDA(array)),
    arrayOfFakeArrays, MAP( clients,
        LAMBDA(client,
        fakeArray( holderName( client, Table1[Holder Name], Table1[Client Name])))),
    result,        MAKEARRAY( totalClients, 10,
        LAMBDA(row,col,
            LET(getRow, INDEX(arrayOfFakeArrays,row,1)(),
                IF( col=1, INDEX( clients, 1), INDEX( getRow, 1, col-1 ) ) ) ) ),
    IFERROR( result, "")
)

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