A Quick Note On Pub-Sub / Event Aggregators In WinJS/WinRT

By now you know that I’m a fan of pub-sub / event aggregators, whether it’s .NET / Winforms or Backbone or whatever. For the last 3 weeks working on this WinJS / WinRT app with the Microsoft P&P group, I’ve had this thought that I want to do the same thing in WinJS / WinRT apps. Only I couldn’t figure out how. @Bennage and I had several discussions on this and decided to look in to it later. Well today was “later” apparently, and thanks to the Chris Tavares I found these wonderful little nuggets of awesome:

WinJS.Application.queueEvent – queue an event to be sent

WinJS.Application.addEventListener – handle an event that was sent

function RaiseEvent(){

  // queue the event to be raised as an object literal
  WinJS.Application.queueEvents({

    // the "type" is the event name
    type: "myEvent",

    // the "detail" is the event args to pass along
    detail: {
      my: "event args",
      go: "here"
    }

  });
}

// subscribe to the "myEvent" event
WinJS.Application.addEventListener("myEvent", function(args){

  // the "args" argument is the object you queued

  args.type; //=> "myEvent"
  args.detail.my; // => "event args"
  args.detail.go; // => "here"

});

RaiseEvent();

Of course this is only an application level event aggregator. If I want to use localized / sub-application / module event aggregators, I need to find another way to make that happen. I have some leads on this, but haven’t had a chance to work on them yet. I have hope, though, and this is yet another reason that I really like working on WinJS apps.

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