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    <p>I figure out a solution myself, that also improves tremendously the EventSource interface.</p> <p><strong>Server side</strong>: Do not send the event type, just include an additional data field (having that I always use json). So instead of</p> <pre><code>event: eventName data: {mykey: 'myvalue'} </code></pre> <p>I send this from the server instead:</p> <pre><code>data: {mykey: 'myvalue', eventName: 'eventName'} </code></pre> <p><strong>Client side</strong>: Now I can use EventSource onmessage callback, that is fired on every message that does not have an event type.</p> <p>And for bind event listeners, I create a wrapper class with Backbone.Event functionality. The result:</p> <pre><code>// Server Sent Events (Event Source wrapper class) var MyEventSource = (function() { function MyEventSource(url) { var self = this; _.extend(this, Backbone.Events); this.source = new EventSource(url); this.source.onmessage = function(event) { var data, eventName; var data = JSON.parse(event.data); var eventName = data.eventName; delete data.eventName; // Now we can monitor all server sent events console.log('app.server.on ', eventName, '. Data: ', data); self.trigger(eventName, data); }; } return MyEventSource; })(); </code></pre> <p>Now with this wrapper class, I can easily extend the functionality, all server sent events can be easily monitored and thanks to extending Backbone.Events the event handling in this class is much more powerful.</p> <p>Usage example:</p> <pre><code>var source = new MyEventSource('url/of/source'); // Add event listener source.on('eventName', function(data) { console.log(data); }); // Fire a event (also very useful for testing and debugging!!) source.trigger('eventName', { mykey: 'myvalue' }); // Unbind event listener (very important for complex applications) source.off('eventName'); </code></pre> <p>Now I have a component that is easy to handle, extend, debug and test.</p>
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    1. POHTML5 EventSource listener for all events?
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    1. CO"Onmessage callback is fired on every message that **does not have an event type**". That was seriously useful information to me. Thanks.
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      1. USMatthew Walker
    2. COJust an fyi: calling `onmessage = some_function;` is exactly the same as calling `addEventListener("message", some_function);`. This makes it obvious that messages without an event type are the same as messages with an event type of "message".
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