C# like events in Javascript

Question

How can I create a new event/ like in c# in javascript?

private event EventHandler asdCompleted;

private void SetEventHandlers()
{
    this.asdCompleted += asd_completed;
}

private void asd_completed(object sender, EventArgs e)
{

}

and fire the event anywhere like in c#:

this.asdCompleted(this, null);

Answer 1

you can define a simple delegate list, like the one used internally by .NET, as follows

function createEvent() {
    var invokeList = [];

    var event = function() {
        for (var i = 0; i < invokeList.length; i++) {
            invokeList[i].apply(arguments);
        }
    }

    event.add = function(value) {
        invokeList[invokeList.length] = value;
    }

    return event;
}

var foo = {
    myEvent: createEvent()
}

foo.myEvent.add(function() { console.log('in my event'); });
foo.myEvent.add(function() { console.log('also in my event'); });

foo.myEvent();

Answer 2

If you use jQuery, then the answer is jQuery Callbacks