Openseadragon: viewer 'open' event not being triggered anymore

[meihuisu]

Viewer open event is not being triggered if viewer is initialized without a tile source
but images are later added on with addTiledImage() calls. Therefore, my code below
will not be called.

---

My code segment below used to start the view with the focused location if the viewer
was called with a specific X, Y, Zoom location (startState is set to true)

myViewer.addHandler('open', function(target) {
  window.console.log("in open handler");
  if(startState) {
    goPosition(newX,newY,newZoom);
    startState=false;
  }
}

[iangilman]

Yes, we consider adding additional images to be different than the initial open. If you want to know when addTiledImage is successful, use this:

myViewer.world.addHandler('add-item', handler);

[meihuisu]

There is a subtle difference in triggering with viewer's 'open' and with world's 'add-item'.
We want to load an image and followed with a function that calls viewerport.panTo and
viewport.zoomTo to take it to a particular location. Under open-handler that worked
but not with add-item-handler. Tracing it, goHome() was called after add-item event within
OpenSeadragon. If panTo() and zoomTo() were called before goHome(), is there a function
that needs to be called to save the new location as the 'home' location and so all the subsequent items will also be using the same 'home' location?

[iangilman]

I see. Well, you can use the preserveViewport: false flag to turn off the goHome entirely, which is probably want you want.

For what it's worth, the success handler passed into addTiledImage happens after the goHome.