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Really, really lightweight event emitting for Node and the browser.
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(though Node already has [event emitting built in][1] so I don't know why you'd
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use this there. This is directly inspired by Node's and doesn't even have all of
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the functionality that Node's event emitter has.)
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This library has three goals:
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1. Make it easy and intuitive to listen for and initiate events on an object.
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2. Be as small as possible. Right now the minified version comes in at 407 bytes
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3. Not pollute the global namespace or the objects it modifies with a bunch of
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crap. I define crap as anything that is not the API.
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There are many other [wonderful libraries that do similar things][2], but none
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of them worked exactly how I wanted them to work or met all the goals above.
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In the browser, just download `smokesignals.js` or `smokesignals.unminified.js`
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and put your choice in a place you can access from your webpage.
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npm install smokesignals
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In the browser include the Smoke Signals script:
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<script src="smokesignals.js"></script>
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var smokesignals = require('smokesignals');
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Make any object an event emitter:
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smokesignals.convert(jill);
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Or if you prefer constructors:
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smokesignals.convert(this);
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var jill = new Person();
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Now you can listen for events:
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function listener(name) {
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window.alert('Hello ' + name + '!');
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jill.on('say hello', listener);
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jill.emit('say hello', 'Jack');
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// alerts: "Hello Jack!"
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And remove a listener:
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jill.off('say hello', listener);
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Or if you only want to listen for an event once:
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jill.once('another event', function() {
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window.alert("I'll only be called once!");
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jill.emit('another event');
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Or remove all listeners for an event:
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jill.off('say hello');
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Or if you want to remove ALL listeners:
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// just reconvert the object...
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smokesignals.convert(jill);
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That's it! One global object (`smokesignals`) and when used it adds 4 methods to
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your objects (`on`, `once`, `off` and `emit`).
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By the way, all methods are chainable:
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var jill = smokesignals.convert({})
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.on('event one', function() { ... })
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.on('event two', function() { ... })
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.once('event three', function() { ... })
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[1]: http://nodejs.org/docs/latest/api/events.html
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[2]: http://microjs.com/#events
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www/lib/smokesignals.js/README.md
