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Reset a session variable and update a list

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  • Reset a session variable and update a list

    I have a ux component with a list, 'Parts', and a edit-combo text box, 'Loc'.

    The list is filtered by an argument, argLocation which is the value of the session variable, site. Filter: site=:argLocation

    When the ux is loaded, the list is populated from the user's location. This is either 'BAF' or 'SRQ'.

    I want to be able to change the value of the lookup field from one location to the other location and then have the list repopulate using the new locations data.

    I think I need to put code into the text box's OnChange event. I believe I want to change the value of the session variable 'site' and then refresh the list. I think that this may be simple, but I can't seem to figure this out.

    I'm having trouble on the code to pass the new value from the textbox to change the value in the session variable. After that, I believe all I have to do is to refresh the list.

    I'm getting confused with ajax callbacks and xbasic functions. I tried watching videos but I just can't wrap my head around this.

    Thanks.
    Alpha 5 Version 11
    AA Build 2999, Build 4269, Current Build
    DBF's and MySql
    Desktop, Web on the Desktop and WEB

    Ron Anusiewicz

  • #2
    Re: Reset a session variable and update a list

    Ron, there are a couple of ways to do this, depending on your needs.

    To change the session var you'll need XBasic code. In the onChange event of your edit-combo, you'd have to make an Ajax Callback to an XBasic function which changes your session variable.

    In the onChange event, Text mode, your code would be...

    Code:
    {dialog.Object}.ajaxCallback('','','changeSessionVar','');
    Your XBasic function, which can be defined in the UX XBasic functions section might be...

    Code:
    function changeSessionVar as c (e as p)
    
      session.myLocation = e.dataSubmitted.Loc
    
      changeSessionVar = "{dialog.object}.refreshListData('Parts');"
    
    end function
    So... the ajax callback is calling your XBasic function (changeSessionVar), which changes the session var and then returns the client-side method to refresh your List data.

    But, if your List is the only control depending upon the session var there may be a way to save you an XBasic callback every time the Location changes.

    Create a textbox control on your UX and in its Client-side show/hide expression put 1=0 so that it doesn't show. Let's call it currLocation.

    In the UX Server-side events, onDialogInialize, put this...

    Code:
    e.control.currLocation = session.Loc
    Now, make a change to your argLocation. Instead of a session var, change the property "Get argument value from" to "Set value a Run-time" and point the argument to your new textbox... currLocation.

    In the onChange event of Loc, do this...

    Code:
    {dialog.Object}.setValue('Loc',this.value);
    {dialog.object}.refreshListData('Parts');
    This way, you're updating a hidden control on your UX with the current Location value selected. Then you're refreshing the List. No extra callback is needed to set the session var.
    Since a List control can be set up a number of different ways for rendering data, you may need to set it to "Delay Render till Explicit Refresh" and then refresh the List in the UX Client-side event "onRenderComplete" in order to render the List the first time the UX is rendered.

    Overall, if you need an updated session var for other stuff, you'll need the callback to update it.
    By the way... that was a really well worded, full of information, question.
    Last edited by Davidk; 07-02-2016, 03:38 PM.

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    • #3
      Re: Reset a session variable and update a list

      David, thanks so much!!

      Your explanation was great and example is spot on. I went with your second option. Much easier and works great. Does just want I was hoping to achieve.

      Ron
      Alpha 5 Version 11
      AA Build 2999, Build 4269, Current Build
      DBF's and MySql
      Desktop, Web on the Desktop and WEB

      Ron Anusiewicz

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