An EventEmitter replacement that allows the library to make events cancelable by the event handlers and allows event handlers to be synchronous or asynchronous.
npm install async-cancelable-events
var EventEmitter = require('async-cancelable-events');
The API is intented to be a mostly-drop-in replacement for Node.js' EventEmitter object, with a little bit of DOM Events and more asynchronicity sprinkled in.
The primary differences between the EventEmitter and async-cancelable-events are:
- If the last argument passed into `
is a function, it is assumed to be a callback that accepts a boolean indicating whether to continue the event (
) or cancel it (
- The `
methods try to "guess" if the provided handler is synchronous or asynchronous (based on its argument length), or can be explicitly registered as synchronous or asynchronous with
- Did you know `
was a thing? I didn't. It's just a synonmym for
.on`, by the way.
- The various method calls are chainable, so `
foo.on('bar', func1).on('baz', func2)` is valid.
License (MIT)Copyright (C) 2012-2013 by David Ellis
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.