renderQueueItem.onStatusChanged only called once

dheidel · **Joined:** Fri May 28, 2010 2:55 pm **Posts:** 2

Hello,

I'm trying to write a script that does something after each item in the render queue gets rendered. I'm setting the onStatusChanged callback, but it only seems to be calling my function immediately after I set the callback, so that even though the status has not changed, the function gets called. From then on, the function never gets called again, even if I change the status to unqueued immediately after setting onStatusChanged. And it certainly doesn't get called when the status goes from queued to rendering or from rendering to done. Am I doing something wrong (I'm new to AE scripting)? Any help would be greatly appreciated. I'm on CS4 on a Mac 10.6.3. Code is below. Thank you.

- David

Code:

function traverseRenderQueue()
{
   var myProject = app.project;
   var myRQ = myProject.renderQueue;
   var i = 1;

   for (i = 1; i<=myRQ.numItems;i++)
   {
      var currentItem = myRQ.item(i);
      if (currentItem.status == RQItemStatus.QUEUED)
      {
         currentItem.onStatusChanged=statusChange(i);
      }
}
   myRQ.render();
   alert("All Done");
}

function statusChange(index)
{   
   app.project.renderQueue.pauseRendering(true);   
   var currentItem = app.project.renderQueue.item(index);
   
   alert("Status for "+currentItem.comp.name+" changed to: "+currentItem.status); //Only called immediately after setting onStatusChanged
   
   if (currentItem.status == RQItemStatus.DONE)
   {
      alert("I got here"); //Never called         
      
   }
   app.project.renderQueue.pauseRendering(false);
   
   
}

dheidel · **Joined:** Fri May 28, 2010 2:55 pm **Posts:** 2

Never mind. Got it working! If anybody else struggles with this, the issue was that the callback function can't have an argument, so the line:

Code:

currentItem.onStatusChanged=statusChange(i);

should have read:

Code:

currentItem.onStatusChanged=statusChange;

And instead of defining the function:

Code:

function statusChange(index)

It should be:

Code:

function statusChange()

You can use the "this" keyword to get the current RenderQueueItem, which is what I was trying to do all along by having the argument in the function call (although I couldn't figure out how to get the item index if I only knew the RenderQueueItem, but I was able to work around that). Maybe this is obvious for long-time javascript-ers (which I'm not), but it would have been nice if there was something in the documentation about that.

Anyway, this is a great site; looking at the archives has been a fantastic resource for delving into AE scripting.

- David

lloydalvarez · **Posted:** Wed Jun 02, 2010 6:57 pm

If you want to pass an argument to your function you can do it like this:

Code:

currentItem.onStatusChanged= function () 
   {
   statusChange(i);
   }

-Lloyd

AE ENHANCERS

renderQueueItem.onStatusChanged only called once

Who is online