How do I refresh a partial view every 3 seconds in MVC 4?

asp.net-mvc-4 asp.net-mvc-partialview entity-framework-6 progress-bar timer

Question

I need to get a progress bar to update based on the number of jobs completed. The number of jobs completed is stored on a jobs table of a SQL Server DB. I need my ASP.NET MVC 4 application to query the DB every 3 seconds for the number of jobs compete and use this data to update the progress bar which is held in a partial view. The timer works and it calls my the _getforStatus action in the StatusController, and it seems to call the EntityDB, but is never seems to call the view other than before the timer tells it to. How do I get the progress bar to refresh every 3 seconds?

The header of my _Layout.cshtml view calls the initiation of the timer which is in the StatusController like so:

 <head>
      ...
       @Html.Action("InitTimer", 'Status")
      ...
 </head>

Also, in the _Layout view I call the partial view into a Jumbotron like so:

 <div class="jumbotron" id=progress">
      @{Html.RenderAction("_GetforStatus", "Status");}
 </div>

The Status controller is coded like so:

 public class StatusController : Controller
 {
      IntegrationDBEntities _db;

      Private Timer timer1;

      Public void initTimer()
      {
           timer1 = new Timer();
           timer1.elapsed += new ElapsedEventhandler(timer_Elapsed(;
           timer1.interval = 3000;
           timer1.Start();
       }

      Private void timer_Elapsed(Object sender, EventArgs e)
      {
           _GetforStatus();
      }

      [ChildActiononly]
      public PartialViewResult _GetforStatus(0
      {
           _db = new IntegrationDBEntities();
           ViewDataModel - _db.Jobs.ToList();
           return partialView();
      }

EDIT: I also tried the following Ajax code. I got no error, but my progress bar never updated:

 <script>
       function loadPartialView()  {
            $.ajax({
                 url:  '@url.Action("_GetforStatus', "Status")",
                 type:  'GET',
                 dataType:  'html',
                 success: function(result)  {
                      $('progress').html(result);
                 }
            });
        }

  $function () {  
       loadPartialView();
       window.setInterval("loadPartialView()", 3000);
  });
 </script>

I'm not sure if it isn't working bc i haven't represented "Html.RenderAction" in JS correctly or what.

1
3
2/19/2015 7:55:08 PM

Accepted Answer

I think you need to make some changes to your ajax call. Here is an example of how I do the call

$.ajax({
    url: '@Url.Action("Action", "Controller")',
    type: 'post',
    cache: false,
    async: true,
    data: { id: "frmUser" },
    success: function(result){
        $('.divPartial').html(result);
    } 
});

on your controller I don't think you need the child action only. Also you are returning an empty partial view object. It should be

return partialView('_partialName', Model);

finally in your jquery to keep the call happening you need to retrigger the call. Try something like this

$(document).ready(function(){
    function RefreshPartial(){
        //this will wait 3 seconds and then fire the load partial function
        setTimeout(function(){
            loadPartialView();
            //recall this function so that it will continue to loop
            RefreshPartial();
        }, 3000);
    }
    //initialize the loop
    RefreshPartial();
}); 
4
2/19/2015 8:06:21 PM


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