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Browse Child Challenge

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    #1

    Browse Child Challenge

    Here's a simple database, with two tables, linked 1:N.


    One form, based on the only set.


    The challenge:


    Build an OnPush script for Button2 to limit the display of records in the embedded child table browse object to a range of dates.


    Any takers?


    -- tom
    Tags: None
    #2
    RE: Browse Child Challenge

    Tom,
    I tried very briefly to get your set to filter the child without luck. The problem appears to be that your link is an expression setting the date order, which apparently prevents the child form being filtered any further. Look at my sample under the other thread: "Embeded Browse Ranging".
    That works because the set link is the "ID" field, not an expression based upon the date that you want to filter. Since your set forces the child order on the date, it may not be possible to filter it. If you find a way to do it, post the solution.
    Peter
    AlphaBase Solutions, LLC

     [email protected]
    https://www.alphabasesolutions.com

    Comment

      #3
      RE: Browse Child Challenge

      Could not the set be modified and filter the child by introducing a date variable?

      Just a guess.

      Tom

      Comment

        #4
        RE: Browse Child Challenge

        Tom,

        Good idea this posting.

        As to Peter's condition to having only the ID field on parent and child as the link, I think what you are seeing is that any solution, in my opinion, is going to have limitations because of the way one to many sets work in Alpha (at least a5v4). The set uses an index that either you create in Alpha ahead of time or that Alpha automatically creates when the set is designed. As you pass from member to member, Alpha can immediately deliver the required records in the embedded browse (and it works very well and very fast do to its use of the index).

        Given that, the question becomes how do I give the user closest to what they want in each individual situation. If they want to know the total of the transactions in a given time period, here is one possible solution. This may work in some instances depending on wht the requirements of the applciation are.

        John

        Comment

          #5
          RE: Browse Child Challenge

          Tom, Try the app attached. I pulled it out of one of our apps and modified to fit yours.
          Jeff

          Comment

            #6
            RE: Browse Child Challenge

            As Peter has pointed out, setting the order in the set definition makes this task impossible. However, you can get close to the desired result by removing the order from the set definition and setting it in the script.

            This method fixes the child record range and keeps it in place as you move from record to recorrd
            Finian

            Comment

              #7
              RE: Browse Child Challenge

              As Peter has pointed out, setting the order in the set definition makes this task impossible. However, you can get close to the desired result by removing the order from the set definition and setting it in the script.

              This method fixes the child record range and keeps it in place as you move from record to record

              Finian
              Finian

              Comment

                #8
                RE: Browse Child Challenge

                Tom, The attachment in my first post uses a conditional filter in the form properties along with a controling filter variable. It will do the job.
                Jeff

                Comment

                  #9
                  RE: Browse Child Challenge

                  Tom, I forgot to mention that the set link was modified in the app I posted. You will need to set the order in the scripting as Finnian suggests. We are doin this successfully in our apps.
                  Jeff

                  Comment

                    #10
                    RE: Browse Child Challenge

                    Tom:
                    Try This
                    Charlie Crimmel

                    Comment

                      #11
                      RE: Browse Child Challenge

                      Tom, yes. that's the approach that Jeff Moses took in his solution, set forth elsewhere in this message thread.


                      A slight drawback to this approach, also noted by Jeff, is that this displays the matching child table records in the order in which they were entered.


                      -- tom

                      Comment

                        #12
                        RE: Browse Child Challenge

                        Jeff, thanks!

                        I see how you did it and can easily apply it to my own work here. I think others will benefit from it as well.

                        Incidentally, I had no idea that the way my linking expression was configured in the set would affect my ability to filter child table records... This is an important lesson for me.

                        -- tom

                        Comment

                          #13
                          RE: Browse Child Challenge

                          Finian, thanks!


                          As mentioned above, I did not realize that my set's linking expression would prevent me from filtering the child table records. This will be important to remember!


                          Your solution will help lots of others.


                          By the way, how would you 'release' the query if the user wanted to go back and 'show all' the child table records? Would you set the filter expression for the child table to a null string and rerun the query, or would you query for all child table records that have a value in the link field?


                          -- tom

                          Comment

                            #14
                            RE: Browse Child Challenge

                            Finian's approach, set forth elsewhere in this thread, manages to filter the matching child records *and* display them in date order. Pretty neat, isn't it!

                            -- tom

                            Comment

                              #15
                              RE: Browse Child Challenge

                              Tom, You can set the order expression in the form properties. This holds the order expression even after the filter has been run. This is reason I use this method so often.
                              Jeff

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