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problem with A_FIELD_VALUE

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  • problem with A_FIELD_VALUE

    Things are almost working, but for one problem. I have a test table called "Junk" with a character field "Anothername." I am looking up names in another table ("names") using a field "Reversenam." This script is attached to the CanWriteField field-rule event for "Anothername."

    The idea here is to type in a few letters and look up in "names" for any items that match. If there are none, the write is cancelled. If there is only one match, that name is simply assigned to FoundItem. If there is more than one match, the form "NameLook" is called as a dialog, which displays the query selected records in a browse item and sets the global variable "FoundItem" on exit according to the selected record.

    So far so good. Now I want to assign FoundItem to A_FIELD_VALUE. Notice that this is possible before calling the dialog, but after the dialog is closed, setting A_FIELD_VALUE causes the program to crash (i.e. stop responding).

    Why? Is there a workaround?


    'Set two global variables
    SearchText = A_FIELD_VALUE
    FoundItem = Junk->Anothername

    'Run rest of script only if user has changed the value in Anothername
    IF SearchText FoundItem THEN

    'Select records which begin with SearchText
    filter = "LEFT(Reversenam," + LTRIM(STR(LEN(SearchText))) + ") = " + chr(34) + SearchText + chr(34)

    tbl ="names")
    query.filter = filter
    query.order = "Reversenam"
    indx = tbl.query_create()

    'Find how many records satisfy the query
    count = indx.records_get()
    FoundItem = tbl.Reversenam

    trace.writeln("Count: " + str(count))

    ****This instance of setting A_FIELD_VALUE works; however FoundItem contains only the first matching record

    A_FIELD_VALUE = FoundItem

    'Depending on how many records found
    IF count = 0 THEN
    FoundItem = ""
    ELSEIF count > 1 THEN
    END IF

    trace.writeln("F: " + FoundItem)

    ****This instance of setting A_FIELD_VALUE causes a crash if count is > 1 (that is, the dialog has been invoked)

    A_FIELD_VALUE = FoundItem

    END IF

  • #2
    RE: problem with A_FIELD_VALUE

    A_Field_value is defines in the xbasic manual as

    "Assigned while in Enter or Change mode, this variable is the value entered into a field before either the cursor leaves the field or the record is saved. Use this variable in a script attached to a field rule event."

    The problem occurs as soon as the field loses focus (the cursor leaves the field), which is what happens when you open a lookup or other form. Then the variable has no context. Since you seem to want to put a returned value back into a field, there is a much better method. If the field object name is "anothername", this will put the returned value into the field on the form

    parentform:anothername.value = founditem

    Incidentally, I would suggest using field names with 10 characters or less. Longer names are saved in the data dictionaries which can be corrupted during a crash and the long name could be lost. This will create many problems.



    • #3
      RE: problem with A_FIELD_VALUE

      Jerry -

      Thanks for the suggestion. I tried it, but got an error message "can't find parentform." I suspect that is because the dialog is called from a Field-Rule event, not directly from another form.

      I have solved the problem, though the solution is a bit clunky. By invoking cancel() before calling the dialog, you prevent the focus from leaving the field (at least, the OnWrote event doesn't fire). Setting A_FIELD_VALUE after the dialog then works, but you don't see this until you exit the field, so I used sys_send_keys() to dump the value of FoundItem into the active control, which after closing the dialog is, in fact, Anothername. Pressing ENTER now causes the CanWrite event to fire again, so I use a flag to allow the second pass to pass the found value through.

      After all this struggle, I discovered that you can do essentially the same thing without any Xbasic at all, by defining a lookup to the names table, and setting the following filter expression:


      Now, Is there a way to make the combo box pop up without reaching for the mouse? Is there a keyboard shortcut for this?

      Thanks for your help.



      • #4
        RE: problem with A_FIELD_VALUE

        Parentform is a relative reference, which doesn't always work with a dialog. Normally with a dialog, I use the actual form name.

        If you have a lookup expression defined, the lookup will pop up only in enter mode. If the form is in change mode, you will need the mouse to get to the lookup.



        • #5
          RE: problem with A_FIELD_VALUE

          Henry, I believe the keyboard shortcut for the table lookup will be Alt-Dn, once the field has focus of course. Check the user's guide at about pg 25 for the section called 'Navigating Within a Form'.

          -- tom


          • #6
            RE: problem with A_FIELD_VALUE


            Good catch. That is one shortcut I never found.



            • #7
              RE: problem with A_FIELD_VALUE


              I hate the Alt-Down_arrow method so I use an OnKey event to have the F8 key do a Sys_send_key("{alt-DOWN}").

              This disables the default use of F8 (I think it is the switch to browse) but I prefer that my users not have that ability by default. If they need that 'default' ability I will give them a button on the form or toolbar.


              • #8
                RE: problem with A_FIELD_VALUE

                Cal, Jerrry, Tom -

                Lots of good suggestions. I found ALT{DN} by trying everything on the keyboard! Not the best documentation, I would say.




                • #9
                  RE: problem with A_FIELD_VALUE

                  Henry, there's much that could be improved in the docs, but this is NOT one of them. The index to the User's guide contains a specific entry for 'Keyboard Equivalents' that leads right to the solution.

                  -- tom


                  • #10
                    RE: problem with A_FIELD_VALUE

                    I apologize. I'm an old fashioned guy who likes books, and am still getting used to trying to read and digest manuals in .pdf format onscreen. I missed the whole topic.

                    One suggestion for the Alpha team - it sure would be nice if you could click on the page numbers in the Index and go right to the page in question, rather than having to type it in. The .pdf manual for the Finale music writing program does this, and it's really handy.

                    Henry Gibbons


                    • #11
                      RE: problem with A_FIELD_VALUE

                      Henry, we share the same trait. I've printed out my PDF files and have them in large notebooks. Acrobat will let you print the front sides, and then the back sides, so two sided sheets are easily possible. -- tom