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Tree view control won't refresh and records corrupted when tree navigation used

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  • Tree view control won't refresh and records corrupted when tree navigation used

    I am having two problems with the native Alpha Five tree control which are demonstrated in the attached zip file containing three records, one form, and one table. This strikes me as a bug, but I'd like confirmation before submitting it.

    The table consists of three fields

    The values in my three records respectively are
    AA1, AA1, AA1
    AA2, AA2, AA2
    AA3, AA3, AA3

    The tree control gets its values from the same table.
    When I open the form, everything is OK.

    Problem Number 1:
    When I click on a line in the tree view control, only the Document
    Description is updated. The Document Id and Document Memo fields
    incorrectly contain the values of the first record.

    My expectation is that when I click on a record in the
    Tree, then Alpha Five should display the values for that field on
    the form.

    This results in corruption of my data.

    Problem Number 2:
    When I click on * Add new record, to create a new record,
    I can successfully add a new record to the table. I would like this
    new record to be displayed in the tree control and have placed
    a button to refresh the tree control object using an
    Action Script.

    The refresh does not work. Only if I exit the form and
    display it will the new record appear in the tree control.

    Anyone else experiencing similar problems with this control?

    Bob McGaffic
    Last edited by rmcgaffic; 04-19-2009, 12:18 PM.

  • #2
    Re: Tree view control won't refresh and records corrupted when tree navigation used

    Here's what's happening:

    When I click on the first record in the tree, the form displays
    AA1, AA1, AA1
    The record displays correctly on the form

    When I click on the second record in the tree, the form displays
    AA1, AA2, AA2
    The values that should display are
    AA2, AA2, AA2

    When I click on the third record in the tree, the form displays
    AA1, AA3, AA1
    The values that should display are
    AA3, AA3, AA3

    Bob McGaffic


    • #3
      Re: Tree view control won't refresh and records corrupted when tree navigation used

      That is because you have based the tree control (the same would be occurring no matter what control type used) on the actual table field. When you choose a value in the control you are simply changing the value in the Document_Description field for the current record. Notice that as soon as you make a choice in the control the form goes into change mode evidinced by the save and cancel butons becoming active on the toolbar.

      If your intention is to choose a description and have the form navigate to the corresponding record then some mods are in order.
      Base the control on a form variable. Then place code in the onChange event of the control that finds the correct record.

      I have attached a sample to demonstrate. I also changed the choices of the control to be supplied by xbasic. The OnInit event of the form initially populates the control and the Onsave event of the form updates it. You will notice that the expression used has a pipe character and the id field added. This causes the description to be displayed but the id to be returned. You can see this in the typein control version of the variable I placed under the tree control. I changed the Id values slightly so this can be seen.

      As far as updating goes, if you had a large amount of records to retrieve, instead of refreshing from the table you could simply add the new values in to the choices list directly. The only downside of that is if on a network you would not see updates from other users till the form was reopened.
      Tim Kiebert
      Eagle Creek Citrus
      A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


      • #4
        Re: Tree view control won't refresh and records corrupted when tree navigation used

        Hi Bob,
        I do get the same results as you no matter if I populate it as you did from the table or with a crlf list.

        As I am not that versed with Trees, the next question is are we both doing something incorrectly or expecting the control to do something it is not supposed to do....

        I also noticed that when selecting/changing the record in focus on the tree, it places Alpha into change mode---that is why the data changes on you when changing the values and then saving the records....

        Hopefully someone like Peter G (he has used trees more than I for sure) will let us know if we are the problem or the tree control!! :)

        It isn't necessarily v9 as this also happens in v8 BTW.

        EDIT:: Cool, thanks Tim! Figured something was wrong as just did not work right as I have had it work before. Should have checked current posts as left this up for a while prior to posting too!!!
        It is only when we forget all our learning that we begin to know.
        It's not what you look at that matters, it's what you see.
        Henry David Thoreau