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57 lines
2.3 KiB
Markdown
57 lines
2.3 KiB
Markdown
7 years ago
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# create-event-emitter
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A simple abstraction for creating your own event-emitting objects. Uses the standard `EventEmitter` implementation in Node.js
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## License
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[WTFPL](http://www.wtfpl.net/txt/copying/) or [CC0](https://creativecommons.org/publicdomain/zero/1.0/), whichever you prefer. A donation and/or attribution are appreciated, but not required.
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## Donate
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Maintaining open-source projects takes a lot of time, and the more donations I receive, the more time I can dedicate to open-source. If this module is useful to you, consider [making a donation](http://cryto.net/~joepie91/donate.html)!
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You can donate using Bitcoin, PayPal, Flattr, cash-in-mail, SEPA transfers, and pretty much anything else. Thank you!
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## Contributing
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Pull requests welcome. Please make sure your modifications are in line with the overall code style, and ensure that you're editing the files in `src/`, not those in `lib/`.
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Build tool of choice is `gulp`; simply run `gulp` while developing, and it will watch for changes.
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Be aware that by making a pull request, you agree to release your modifications under the licenses stated above.
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## Usage
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```javascript
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const createEventEmitter = require("create-event-emitter");
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let doorbell = createEventEmitter({
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ring: function ringDoorbell(noise = "RING RING!") {
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this.emit("ringing", noise);
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}
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});
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doorbell.on("ring", (noise) => {
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console.log(`Doorbell is ringing: ${noise}`);
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});
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doorbell.ring(); // Prints: "Doorbell is ringing: RING RING!"
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```
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## API
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### createEventEmitter(properties)
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Creates a new event-emitting object with the specified properties. The resulting `emitter` has the standard [EventEmitter API](https://nodejs.org/api/events.html#events_class_eventemitter).
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* __properties__: The properties that the new event-emitting object should have. These are simply merged into the `emitter` object.
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### emitter.emit(eventName, [... arguments])
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Emits the specified event on the `emitter`, triggering the associated event handlers, if any. You'd usually call this from *within* a method on the `emitter`, as `this.emit`.
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* __eventName__: The name of the event to emit/trigger.
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* __... arguments__: The arguments to pass to the event handler. Any amount is allowed.
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Note that this is part of the API of the standard Node.js EventEmitter, as documented [here](https://nodejs.org/api/events.html#events_emitter_emit_eventname_args).
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