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how to check if application is online

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  • how to check if application is online

    Please forgive me if this is something obvious, but i can't seem to find the information from the videos or searching this forum.

    A typical example would be when filling out a user profile form there is an option to upload a photo. We would not want to store a photo in local storage when the application goes offline, so probably it would be best to disable the upload button instead, and alert the user the application has lost internet connectivity.

    Could anybody please point me into the right direction handling this?

    Thank you very much

  • #2
    Re: how to check if application is online

    may be hostavailable(your_site.com,port_number)
    thanks for reading

    gandhi

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    • #3
      Re: how to check if application is online

      Hi,

      Try this:

      var flag = {dialog.Object}._getOnlineStatus();
      if(flag==false){
      alert('check your internet connection')
      }

      Comment


      • #4
        Re: how to check if application is online

        thanks guys,

        i didn't get to explore on hostavailable - (was not able to find he xbasic code for it).
        The dialog.Object}._getOnlineStatus() was always returning true may because its on a local machine and disabling the network card was not enough. it pointed me to {dialog.Object}.serverIsAvailable though, im gonna try that out.

        Thank you!!!

        Comment


        • #5
          Re: how to check if application is online

          This worked for me:

          window.navigator.onLine

          I use it like this:

          var flag = window.navigator.onLine ;
          if(flag==false){
          alert('Internet Not Connected');
          }
          else
          {
          {dialog.object}.refreshListData('YOURLISTNAME');
          }

          Comment


          • #6
            Re: how to check if application is online

            Gordon,
            You might want to try putting a "debugger;" statement in front of a call to the "{dialog.Object}._getOnlineStatus();" js function and tracing through how that function works. In the end it should end up using the same line of code you have about "window.navigator.online". But the "._getOnlineStatus()" function takes care of a lot of things for you. But you may have to use the "._setSimulatedOnlineStatus(mode)" function when running under local development server to simulate the correct offline / online status.

            Code:
            // Use "{dialog.Object}._getOnlineStatus();"  along with the following functions:
            
            //set the device to simulate disconnected state
            {dialog.Object}._setSimulatedOnlineStatus('off');
            //set the device to simulate connected state
            {dialog.Object}._setSimulatedOnlineStatus('on');
            //turn of simulation. the ._getOnlineStatus() method will return the true state
            {dialog.Object}._setSimulatedOnlineStatus('');
            When you run against the local built-in development server the online status has nothing to do with that local development server, it has to do with if the browser thinks it has an outside connection or not.

            If you use phoneGap, see the on-screen notes for the online status function - there is something you have to include in your project for it to work correctly.

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