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To Wait (Synchronous) for a function to complete - then proceed

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    To Wait (Synchronous) for a function to complete - then proceed

    I know to use timer or delay requirement using setTimeout function, but my requirement is different - I need to wait for a process or function to complete before proceeding.

    To make an Asynchronous (no wait to complete to continue) function act like an Synchronous (Wait to complete to continue), so the rest of the code waits until this is completed. Some type of pause function without hardcoding how many milliseconds to pause.

    The following will not work.
    setTimeout ( function(){
    {
    ...more_code...
    dialog.object}.panelSetActive('PANELCARD_3');
    },200);
    Thanks!

    #2
    Re: To Wait (Synchronous) for a function to complete - then proceed

    The easiest thing to do would be to return the code to execute from the ajaxCallback (I assume this is happening after a callback?)

    Alternatively, you could use a global variable, like {dialog.object}.__continue = false. Set __continue = true when the code you're waiting to finish is done. Then you can use something like setInterval to check the variable & then execute the desired code - note: you will want to clear your setInterval after executing whatever it is that you wanted to do next, otherwise it will keep executing in a loop.

    What process are you running that requires waiting? Is there a server-side or client-side event you could hook?
    Alpha Anywhere latest pre-release

    Comment


      #3
      Re: To Wait (Synchronous) for a function to complete - then proceed

      you could also just nest your setTimeout:

      Code:
      // example from mdn page on setInterval:
      (function loop(){
         setTimeout(function(){
      
            // logic here
      
            // recurse
            loop();
      
        }, 1000);
      })();
      Alpha Anywhere latest pre-release

      Comment


        #4
        Re: To Wait (Synchronous) for a function to complete - then proceed

        Sarah, Awesome Ideas! I am already coding. Thanks!

        Comment


          #5
          Re: To Wait (Synchronous) for a function to complete - then proceed

          and this is happening after a callback... Thanks!

          Comment


            #6
            Re: To Wait (Synchronous) for a function to complete - then proceed

            Originally posted by JPMPA View Post
            and this is happening after a callback... Thanks!
            If you're code needs to execute after the callback is complete, I would see if you could just return the javascript from the callback instead of using setTimeout/setInterval/etc. It'll be guaranteed to happen after the callback completes and you don't have to spend your brain power guessing how many milliseconds of waiting are needed to finish the operation.
            Alpha Anywhere latest pre-release

            Comment


              #7
              Re: To Wait (Synchronous) for a function to complete - then proceed

              Hi,

              Can you not just click the synchronous checkbox in an action JavaScript window? See attached picture ... Note I have clicked the 'Explain this' hyperlink. Call the callbacks using ActionJavascript and click the checkbox. Should work!

              synchronousJS.jpg

              Phil

              HTH

              Comment


                #8
                Re: To Wait (Synchronous) for a function to complete - then proceed

                I use this NEW feature and I love it. I put up a waiting message first, run the process, then hide the wait message. It works great! Thank you Alpha. It's the little things like this that make using Alpha a joy to work in.

                Comment


                  #9
                  Re: To Wait (Synchronous) for a function to complete - then proceed

                  Great feedback. Synchronous checkbox is excellent.

                  Comment


                    #10
                    Re: To Wait (Synchronous) for a function to complete - then proceed

                    Just a thought: You could always chain JS functions.

                    So rather than doing something like this (which doesn't work)...

                    Code:
                    retval = longProcess();
                    alert(retval);
                    ...do something like this (not tested, but the gist of it is there)

                    Code:
                    function a(){
                       retval = longProcess();
                       return b(retval);
                    }
                    
                    function b(passedVal) {
                       alert(passedval);
                    }
                    Now alert() would wait until longProcess() finishes.

                    Comment


                      #11
                      Re: To Wait (Synchronous) for a function to complete - then proceed

                      Thanks!

                      Comment


                        #12
                        Re: To Wait (Synchronous) for a function to complete - then proceed

                        Hi Guys,

                        I have a similar problem but the solutions here do not seem to work for it.

                        I have a slider and whenever the slider changes the value, it calls a function. The function has some long calculation going on so, it is a little slow. So, when you are moving the slider, it hangs.
                        I am trying to set up a timer so, that if the slider moves before 2 seconds, the function is not called. But if the slider is not moving for 2 or more seconds, the function gets called.

                        I tried using setInterval function but it kept calling the function after 2 seconds of each slider move so, at one point it hangs.

                        I was wondering if there is a way to work around it. Or, if I can reset the timer every time the slider moves?

                        Thanks,

                        Pevisha

                        Comment


                          #13
                          Re: To Wait (Synchronous) for a function to complete - then proceed

                          Originally posted by PevishaJ View Post
                          Hi Guys,

                          I have a similar problem but the solutions here do not seem to work for it.

                          I have a slider and whenever the slider changes the value, it calls a function. The function has some long calculation going on so, it is a little slow. So, when you are moving the slider, it hangs.
                          I am trying to set up a timer so, that if the slider moves before 2 seconds, the function is not called. But if the slider is not moving for 2 or more seconds, the function gets called.

                          I tried using setInterval function but it kept calling the function after 2 seconds of each slider move so, at one point it hangs.

                          I was wondering if there is a way to work around it. Or, if I can reset the timer every time the slider moves?

                          Thanks,

                          Pevisha
                          setInterval executes every x milliseconds. setTimeout executes once. It would probably be easier to use setTimeout:

                          Code:
                          //JavaScript Code Section
                          {grid.object}.timer = null;
                          
                          //call function from onslide event:
                          var handleSlider = function (e,id) {
                            clearTimeout({grid.object}.timer);
                            {grid.object}.timer = setTimeout(function (e,id) {
                              alert('done');
                            }, 2000);
                          };
                          Alpha Anywhere latest pre-release

                          Comment


                            #14
                            Re: To Wait (Synchronous) for a function to complete - then proceed

                            Thanks!

                            I will try that out.

                            Pevisha

                            Comment


                              #15
                              Re: To Wait (Synchronous) for a function to complete - then proceed

                              I have a somewhat similar problem, but with xbasic code. I am using the File upload function to get data file from the user. I then use the 'After upload' to call an xbasic function to put the data in a holding table. the return from this first xbasic function is a message to the user that the data has been loaded. I then need to use another xbasic to call the validation processes (SQLServer stored procedure) that checks the data and moves it to another table. The second xbasic function returns a message that the processing is complete. THE PROBLEM: I can't figure out how to run the second xbasic function. When I call it from the first xbasic function OR make an xbasic function that calls both sequentially, the user never gets the intermediate 'Data Loaded, Please wait while processing' message. Any ideas? Should I post this to a separate thread?

                              Comment

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