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Show/Hide expession in UX Tab Control

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  • Show/Hide expession in UX Tab Control

    I have an Accordion style Tab Control with 3 Tab Panes in a panel card, each containing a List Control and I want to hide any of the Tab Panes if the associated list is empty (returns no rows).

    I tried a Show/Hide expression in the Tab Pane testing the List Control for "" but was not surprised when it didn't work

    I am not sure where to start looking to make this happen, somewhere between client and server side scripting I suppose.

    Any help would be appreciated

    Thanks

    Steve

  • #2
    Re: Show/Hide expession in UX Tab Control

    Hi Steve,

    What exactly is the expression for the Tab pane you are using for the Show/Hide?
    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


    • #3
      Re: Show/Hide expession in UX Tab Control

      Originally posted by Keith Hubert View Post
      Hi Steve,

      What exactly is the expression for the Tab pane you are using for the Show/Hide?
      Hi Keith,

      Thanks for responding

      I was testing the list control in the tab pane show/hide
      For example List1 != ""
      It didn't really make any sense at the time although I am not sure how to check that no rows were retuned by the list control so I could set the condition true or false.

      The objective was to hide the accordion control if there were no entries in the list

      Comment


      • #4
        Re: Show/Hide expession in UX Tab Control


        The objective was to hide the accordion control if there were no entries in the list
        Which means you would need to get a count of the records that you would have expected to see if there were any.

        If count > 0 show tab pane.

        Not sure how to advise you how to do that at the moment.
        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


        • #5
          Re: Show/Hide expession in UX Tab Control

          Originally posted by Keith Hubert View Post
          Which means you would need to get a count of the records that you would have expected to see if there were any.

          If count > 0 show tab pane.

          Not sure how to advise you how to do that at the moment.
          I suppose we need to use java script and get a pointer to the list object
          Something like
          var listObj = {dialog.object}.getControl('LIST1');
          And then use listobj to get the count for true or false value

          Comment


          • #6
            Re: Show/Hide expession in UX Tab Control

            Hi Steve,

            Perhaps this should be another question in this forum, "How to get count of records in List Control?"

            Another alternative is to count the records directly in the table, with the same filter as the List Control.
            Last edited by Keith Hubert; 11-02-2013, 08:21 AM.
            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


            • #7
              Re: Show/Hide expession in UX Tab Control

              Steve - This can be very tricky (timing-wise) depending on how you are loading your List controls. What method are you using to load the data? You can use this._rData.length to get the row count inside any of the List Control events. I know there have been some enhancements made in build 1755 to make this a little easier.

              Comment


              • #8
                Re: Show/Hide expession in UX Tab Control

                Originally posted by DaveF View Post
                Steve - This can be very tricky (timing-wise) depending on how you are loading your List controls. What method are you using to load the data? You can use this._rData.length to get the row count inside any of the List Control events. I know there have been some enhancements made in build 1755 to make this a little easier.
                Thanks Dave,
                We've only been working with Alpha for a few months
                I suppose the issue here is that it looks like the accordion is rendered on the loading of the panel and Therefor the decision on when to count the records has to occur earlier. There are only a few records in each of the lists perhaps 4 or 5 in each of the three.
                Is the this._rData.length a method of the list control object, if not how do I access ?

                Comment


                • #9
                  Re: Show/Hide expession in UX Tab Control

                  Originally posted by Keith Hubert View Post
                  Hi Steve,

                  Perhaps this should be another question in this forum, "How to get count of records in List Control?"

                  Another alternative is to count the records directly in the table, with the same filter as the List Control.
                  Perhaps you're right Keith.
                  I think Dave in another reply has highlighted a timing issue which may be an underlying problem with what I am trying to do. Maybe I need to populate three hidden fields at the start of the panel and use a call back to do a SQL count to get the totals of each.

                  I've done this with Visual Basic before now but not sure where to start in Alpha maybe an Xbasic function is the starting point. Any ideas?

                  Comment


                  • #10
                    Re: Show/Hide expession in UX Tab Control

                    Are you using the SQL Data Source Type to populate the data in your List control(s)? If so, there is an optional Server side afterQuery event you can use to check the count of records. More importantly, you can return some Javascript here and call a method or methods to modify your accordion and List controls.

                    this._rData.length is a variable which is available in any of the List Control Javascript events. When you open the List Control builder and click on the List Properties tab, there are events listed under Javascript - Render Time. I have used OnListDraw before and added Javascript to check the value of the variable this._rData.length to see if it was equal to zero. If so, I display some text in a Panel Overlay container so it appears on top of the List Control telling the user the list is empty.

                    Comment


                    • #11
                      Re: Show/Hide expession in UX Tab Control

                      Originally posted by DaveF View Post
                      Are you using the SQL Data Source Type to populate the data in your List control(s)? If so, there is an optional Server side afterQuery event you can use to check the count of records. More importantly, you can return some Javascript here and call a method or methods to modify your accordion and List controls.

                      this._rData.length is a variable which is available in any of the List Control Javascript events. When you open the List Control builder and click on the List Properties tab, there are events listed under Javascript - Render Time. I have used OnListDraw before and added Javascript to check the value of the variable this._rData.length to see if it was equal to zero. If so, I display some text in a Panel Overlay container so it appears on top of the List Control telling the user the list is empty.
                      Thanks, I'll check it out

                      Comment

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