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Lesson Learned: Returning Javascript from Xbasic function

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  • Lesson Learned: Returning Javascript from Xbasic function

    Hopefully, this might help someone else avoid wasting countless hours as I have this week trying to get Javascript code to execute automatically after an Ajax callback.

    With a grid displayed on the screen, I used an Action Button to trigger an Ajax Callback. The Xbasic function manipulated records in the underlying table and I needed to automatically refresh the grid upon exit from the Xbasic function. After watching every related video and searching the Wiki and message board multiple times, I still could not get the Javascript to execute automatically upon exiting the function. The command to do so is rather simple

    FunctionName = "{grid.Object}.refresh();"

    and should refresh the grid upon exit from the function, but it simply did not work for me. There was no error message or indication that I had done something wrong. I then used a workaround by following the Ajax Callback with Inline Javascript using the setTime method to create a delay before issuing the refresh grid comand, which worked, but with a fixed time delay that I had to make long enough to support processing the maximum number of records expected in the table - definitely not optimal!

    Refusing to give up, I was reviewing one of Peter Gruelich's helpful posts for about the thirteenth time when I for the first time paid attention to his function declaration, which was "function SomeFunction as c (e as p)". The "c" jumped off the page at me. Looking at my own function declaration, I found that it was "function ProcessInv as v (e as p)" - I had copied another function and changed only the name and code, not the data type! After correcting the data type to "c", the function worked flawlessly and refreshed my grid upon exit.

    It is amazing how one can be blind to something that is, in retrospect, so obvious. The Javascript code that is returned from the Ajax Callback is contained within a string, therefore the function must be declared as character data type for the Javascript to be returned and executed.

    Terry

  • #2
    Re: Lesson Learned: Returning Javascript from Xbasic function

    When you create the button with the callback, there's an opportunity to create the prototype function. It's usually a good idea to use this.

    So while we're here, and for others, a very simple example:

    Code:
    function ShowAlert as c (e as p)
    
       ShowAlert = "alert('This is an example');"
    
    end function
    Something else to consider is that if all you need is some javascript, you can do that from your Action Button without using a callback. This is faster, and takes less coding. Where the button provides an opportunity for action javascript, you could either use in-line javascript or just switch to Text mode, and simply enter:

    Code:
    {grid.Object}.refresh();
    -Steve
    sigpic

    Comment


    • #3
      Re: Lesson Learned: Returning Javascript from Xbasic function

      Here is a tip:

      Users like to feel empowered. In a large app, I was having trouble with refreshing and so I put a "Refresh" button above the grid. The Client loved it, so now I put them on every grid, and when the Client gets frustrated ("this can't be right!") he can click this 3 or 4 times to satisfy him (or her) self that it is working.

      Here's a pic of one. I always use the same icon (search alpha's built-in images for "refresh") and word and put it in the same place.

      It is a simple action button that only takes 30 seconds to build.
      refreshbtn.jpg
      Pat Bremkamp
      MindKicks Consulting

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