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How to build a dynamic lookup in a dropdown?

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  • How to build a dynamic lookup in a dropdown?

    .
    Hi,
    I'd be grateful for any tips on how to do a certain type of lookup. I'm illustrating it with a simplified version:

    - I have two tables, Events and Places
    - In the Events table there is an eventplace field that does a lookup to the Places table


    IMAGE 1: In the Events table, when the user goes to the Place field, he can type whatever he wants and that gets recorded (for example, Moscow)
    01 dropdown initial.JPG

    IMAGE 2: If instead of typing anything the user clicks on the dropdown arrow, a list of all cities in the Places table appears
    02 dropdown all cities.JPG

    IMAGE 3: But if the user first types something (like "an") and then clicks the arrow, only those cities that contain "an" appear
    03 dropdown selected.JPG



    Thank you for your suggestions,
    Felix
    .

  • #2
    Re: How to build a dynamic lookup in a dropdown?

    You want a filtered lookup. The filter would be something like

    place.value $ place

    You don't mention where you have created the dropdown. Table field rules or form object definition?
    There can be only one.

    Comment


    • #3
      How to build a dynamic lookup in a dropdown?

      .
      Stan,
      Thank you for your reply. I have created the dropdown in the table field rules. Just for completion, my fields are:

      EVENTS table
      - eventid
      - action
      - place

      PLACES table
      - placeid
      - location

      What I have done is:
      - Gone to the field rules of EVENTS table, place field
      - Filled it in as shown in the figure. What I guess is missing is the filter (highlighted in pink). I have tried several combinations but none will do.
      If instead of creating the dropdown in the table field rules it is built in a form, the solution would also be useful for me.



      Best regards,
      Felix
      .

      Comment


      • #4
        Re: How to build a dynamic lookup in a dropdown?

        Felix,
        If you post that database to the message board, we can have it to show you how it can be done.
        Mike W
        __________________________
        "I rebel in at least small things to express to the world that I have not completely surrendered"

        Comment


        • #5
          Re: How to build a dynamic lookup in a dropdown?

          I tried something that didn't work. This is definitely not my area of much knowledge.

          Thanks for jumping in Mike.
          There can be only one.

          Comment


          • #6
            Re: How to build a dynamic lookup in a dropdown?

            Sounds like a plain Vanilla lookup using lookup table in the Field Rules, but.. what is a little confusing:
            1-You are asking for a filter. It sounds from your original post that you do not need any filter since you are not looking places based on the event or anything else for that matter. In which case the filter would be all records, IOW .T.
            2-In this plain vanilla lookup if the user types the beginning letters and then presses the arrow button, it will only show those values starting with this letter(s). So why is this an issue? I suppose its an issue, or so it seems to you, since you haven't gotten through step 1, the filter. Just put .t. for filter and go from there.
            And while you are at it, use places for order.

            Comment


            • #7
              Re: How to build a dynamic lookup in a dropdown?

              The way I got this to work, by a method shown to me many moons ago, was to have a variable field on the form. In my case it was named lookup.
              This meant the filter had a value to work with. Any value entered into the variable first made the filter work.

              The filter looked like this containsi(Company,"*"+TRIM(var->lookup)+"*")

              Good luck.
              Attached Files
              Regards
              Keith Hubert
              Alpha Guild Member
              London.
              KHDB Management Systems
              Skype = keith.hubert


              For your day-to-day Needs, you Need an Alpha Database!

              Comment


              • #8
                How to build a dynamic lookup in a dropdown?

                Hi Gabriel,
                What I need is that the dropdown should show all values that contain the typed-in letters, not only those that begin with the typed-in letters. As you can see in attachment C of my first post, for "an" you get Los Angeles, San Diego, San Francisco and New Orleans.

                Keith,
                Your solution is a nice one and probably the one I'll finally adopt. I was just wondering if it could be done (without a lot of coding) the way I was trying.

                Mike,
                I'm posting the database in a zipped file. If anything is missing, please advise me and I'll work on it.
                Diary.zip

                Thank you all for your comments, suggestions and time.

                Best regards,
                Felix
                .

                Comment


                • #9
                  Re: How to build a dynamic lookup in a dropdown?

                  I was just wondering if it could be done (without a lot of coding) the way I was trying.
                  I dont think so. As I said before if you are wanting to perform a filter on the lookup, it will need a value to work with. I dont know of another way to do what you want, without a lot more coding.
                  Regards
                  Keith Hubert
                  Alpha Guild Member
                  London.
                  KHDB Management Systems
                  Skype = keith.hubert


                  For your day-to-day Needs, you Need an Alpha Database!

                  Comment


                  • #10
                    Re: How to build a dynamic lookup in a dropdown?

                    I agree with Keith. It will require coding. I use this so much I have it in my code library. You could use a progressive lookup that has that capability (see attached). It works well for lookups of small tables. When tables get big (>2000 records), you have to have the lookup wait until 2-3 letters are typed before the choice list is populated.
                    Attached Files
                    Mike W
                    __________________________
                    "I rebel in at least small things to express to the world that I have not completely surrendered"

                    Comment


                    • #11
                      How to build a dynamic lookup in a dropdown? --> great solution!

                      .
                      Mike,
                      I have just tried the Diary.zip you posted in the thread. It's a nice, elegant solution and (with your permission) I'll make use of it in my work.


                      Best regards,
                      Felix
                      .

                      Comment


                      • #12
                        Re: How to build a dynamic lookup in a dropdown?

                        Nice one Mike.

                        Very neat solution but as we both stated, required extra coding.
                        Regards
                        Keith Hubert
                        Alpha Guild Member
                        London.
                        KHDB Management Systems
                        Skype = keith.hubert


                        For your day-to-day Needs, you Need an Alpha Database!

                        Comment


                        • #13
                          How to build a dynamic lookup in a dropdown? --> "How To" document

                          Hi,
                          I'm attaching a "How To" Word document that shows how to do a dynamic dropdown lookup, assembled from suggestions from all of you. Thank you again for your help.

                          Dynamic dropdown lookup.doc

                          Best regards,
                          Felix
                          .

                          Comment


                          • #14
                            Re: How to build a dynamic lookup in a dropdown?

                            Very nice Keith/Felix. Good to have this very nice reference on the MB.
                            Mike W
                            __________________________
                            "I rebel in at least small things to express to the world that I have not completely surrendered"

                            Comment

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