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Passing session variable to JavaScript?

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  • Passing session variable to JavaScript?

    Does anyone know how to pass a session variable to JavaScript?

    I would like to do something like this:
    Code:
    var vItem = session.item;
    {grid.Object}._setValue('D','ITEM',vItem);
    Peter
    AlphaBase Solutions, LLC

    Peter@AlphaBaseSolutions.com
    https://www.alphabasesolutions.com



  • #2
    Re: Passing session variable to JavaScript?

    I think you can do something like this:

    Code:
    var vItem = <%A5? session.item %> ;
    {grid.Object}._setValue('D','ITEM',vItem);
    -Steve
    sigpic

    Comment


    • #3
      Re: Passing session variable to JavaScript?

      Steve .. That isn't going to work.

      Remember session variables are server side and JavaScript variables are client side.

      You can't execute xbasic from within JavaScript because xbasic only runs on the server.

      Your options are to use an Ajax callback, use a server event ( which I show how to do in this video .... http://screencast.com/t/NGU2MzM4N2Et ) or you can use a technique I described in a previous post about uploading a file that is really similar to an Ajax callback.

      If you are drawing a blank with all of this another option is to store these variables in a table which could be referenced by the user Id or a session variable then you could use the _getValue method to set a Javascript variable.
      Bob Moore


      Comment


      • #4
        Re: Passing session variable to JavaScript?

        Originally posted by Bob Moore View Post
        Remember session variables are server side and JavaScript variables are client side.

        You can't execute xbasic from within JavaScript because xbasic only runs on the server.
        Bob,

        You describe the problem exactly. Is there a server event which fires when you push a grid's custom button? That would solve my problem.

        Your options are to use an Ajax callback, use a server event ( which I show how to do in this video .... http://screencast.com/t/NGU2MzM4N2Et ) or you can use a technique I described in a previous post about uploading a file that is really similar to an Ajax callback.
        I'll have to ponder this some more.

        If you are drawing a blank with all of this another option is to store these variables in a table which could be referenced by the user Id or a session variable then you could use the _getValue method to set a Javascript variable.
        That might be a possibility, but that is a really ugly solution. I'll have to think about it some more, as well.

        Alpha really needs to come up with a way to pass session variables to JavaScript within the context of JS Action Scripting (global variables too!).
        ===
        We need this:

        JS Action Scripting<==>session.variable<==>Global Variable
        Peter
        AlphaBase Solutions, LLC

        Peter@AlphaBaseSolutions.com
        https://www.alphabasesolutions.com


        Comment


        • #5
          Re: Passing session variable to JavaScript?

          You describe the problem exactly. Is there a server event which fires when you push a grid's custom button? That would solve my problem.
          In this case, just a button click, you will most likely want to use an ajax callback. I'll try to put together a short video on how to do this when I have the time. It's not all that hard to do once you get the basics down.
          Bob Moore


          Comment


          • #6
            Re: Passing session variable to JavaScript?

            I was just modifying some stuff Lenny offered up a while ago. Haven't done or tried much of it and my example is not tested.

            Edit: I had an idea this would work, and it does:

            Code:
            <%A5
            dim MyA5Var as c = "This is my A5 Variable."
            %>
            
            <script type="text/javascript">
            var js_var = '<%A5? MyA5Var %>';
            alert(js_var);
            </script>
            Last edited by Steve Workings; 12-24-2009, 12:28 PM.
            -Steve
            sigpic

            Comment


            • #7
              Re: Passing session variable to JavaScript?

              Steve,

              That's pretty cool ... I didn't know you could do that!

              So if you need to set the Javascript variable when the original page is generated on the server, then this technique will work.

              However, you must keep in mind that this is working because this A5W page is generated on the server and the Javascript variable is being resolved when the server renders the page.

              So ... if you need to set the Javascript variable after the page is rendered, based on some dynamic data in the grid, then you are still going to have to either issue an Ajax callback or call an A5W page, say in a popuup, to fire the Xbasic code. But the cool thing is that this technique is really simple to implemment in any case for assigning an Xbasic variable to a Javascript variable.

              Thanks for sharing.
              Bob Moore


              Comment


              • #8
                Re: Passing session variable to JavaScript?

                WOW ... Steve is really on to something here.

                Forget everything I said about not being able to execute A5 code from within Javascript because this technique works and this is very simple to do.

                I added a button to grid.
                Then added this Javascript to the on-click event:

                js_session_var= '<%A5 ? session.SessionID %>';
                alert(js_session_var);

                This sets the Javascript variable js_session_var to the session.SessionID which is automatically generated by A5 when the page is genereted.

                Very cool and very easy.


                EDIT : Oops I spoke too soon. I started looking at the code in Firebug and what is happening is that this is being resolved when the page is generated. When you look at the page source, you can see this. So we are not executing A5W code when the button is clicked, thus you can't execute A5W (server side code) from within Javascript (which makes sense). Still very cool.
                Last edited by Bob Moore; 12-24-2009, 01:54 PM.
                Bob Moore


                Comment


                • #9
                  Re: Passing session variable to JavaScript?

                  Originally posted by Steve Workings;519832
                  [code
                  <%A5
                  dim MyA5Var as c = "This is my A5 Variable."
                  %>

                  <script type="text/javascript">
                  var js_var = '<%A5? MyA5Var %>';
                  alert(js_var);
                  </script>[/code]
                  Thanks Steve. That is useful to know. Doesn't solve my problem though since I am in the context of Action JS. I'm also avoiding a5w pages as much as possible and trying to stick to grids within a tabbed_ui.
                  Peter
                  AlphaBase Solutions, LLC

                  Peter@AlphaBaseSolutions.com
                  https://www.alphabasesolutions.com


                  Comment


                  • #10
                    Re: Passing session variable to JavaScript?

                    Just curious - any resolution on how to pass a session.__protected__variable to be used in an Inline-Javascript?

                    Comment


                    • #11
                      Re: Passing session variable to JavaScript?

                      Originally posted by Scholin View Post
                      Just curious - any resolution on how to pass a session.__protected__variable to be used in an Inline-Javascript?
                      Scholin, isn't this the answer:
                      Originally posted by Bob Moore View Post
                      ...
                      I added a button to grid.
                      Then added this Javascript to the on-click event:

                      js_session_var= '<%A5 ? session.SessionID %>';
                      alert(js_session_var);

                      This sets the Javascript variable js_session_var to the session.SessionID which is automatically generated by A5 when the page is genereted.

                      Very cool and very easy.
                      ...
                      Peter
                      AlphaBase Solutions, LLC

                      Peter@AlphaBaseSolutions.com
                      https://www.alphabasesolutions.com


                      Comment


                      • #12
                        Re: Passing session variable to JavaScript?

                        I've read and tried variations on this post but I'm still missing something in my needs. I'd like to use the OnSearchRender to set a default search field to session.UserID when the grid is opened from the Tabbed UI. How would I do that?

                        Comment


                        • #13
                          Re: Passing session variable to JavaScript?

                          If you are running a grid could you not put the initial value to be a session variable and on update or insert pull the e.datasubmitted.item into the javascript somehow.

                          Just a thought.
                          Chad Brown

                          Comment

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