Reading parameters in an SDL Tridion 2011 publish dialog extension

Question

I've built a GUI extension to 'inject' my own JavaScript into the SDL Tridion 2011 publish dialog (as explained in this post and comment: http://albertromkes.wordpress.com/2012/01/30/tridion-gui-extensions-how-to-load-a-javascript-without-showing-a-gui-element/)

I see in SDL Tridion's publish dialog (publish.js) that the publish dialog takes some parameters (not on the URL), these are passed in. For example:

var p = this.properties;
if (p.params && p.params.items && p.params.items.length > 0)

So in my JavaScript I'd like to get hold of the properties.params.items but I cannot seem to get hold of it.

My JavaScript code is inserted 'after' the publish view has loaded:

<cfg:extension target="Tridion.Web.UI.Editors.CME.Views.Popups.Publish">
  <cfg:insertafter>Extensions.Resources</cfg:insertafter>
</cfg:extension>

And in my JavaScript (and in Firebug Console) I've tried to obtain the value using $display.getView().properties, but this returns a null object.

I've been using Firebug to look around the window, $display and various other objects, but cannot see a way to get to the params object.

My JavaScript looks like this:

$evt.addEventHandler($display, "start", itemsForPublish);

function itemsForPublish() {

    var p = $display.getView().properties;
    var items = p.params.items || [];

    alert(items);
}

Answer 1

This should work:

function itemsForPublish() {
    alert(window.dialogArguments.items);
}

In the 'Publishing.js' (and in 'Publish.js') you can see that the items to publish are send to the Popups' dialogArguments.