Emitter: a simple event emitter for Node.js and browser

Usage

Create new emitter

  var emitter = Emitter.create();

Trigger the specified event. Any additional parameters will be passed to the callback.

  emitter.emit("ready");
  emitter.emit("ready", arg1, arg2, argN);

Attach a new event handler.

  emitter.on("ready", callback);
  emitter.on("ready", callback, this);

Detach a specific event handler. If no callback is provided, then all event handlers will be removed.

  emitter.off("ready", callback);
  emitter.off("ready");

Return a copy of all listeners for a given event name. If event doesn't exist, then an empty array will be returned instead.

  emitter.listeners();

Attach a new event handler that will be executed only once.

  emitter.once("ready", callback);
  emitter.once("ready", callback, this);

You can extend objects.

  var object = {};
  Emitter.extend(object);
  object.on("ready", callback);
  object.emit("ready");

Install jasmine-node with npm install jasmine-node -g and run tests with jasmine-node emitter.spec.js.