Package Exports

callback-registry

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (callback-registry) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Intro

A simple registry for callbacks that allows you to add one or more callbacks under some key and then execute all callbacks under some key.

Example:

const registryFactory = require('callback-registry');

const registry = registryFactory();

// add a new callback for that event key
registry.add('event-key', function(){
    console.log('the event occurred')
});

// execute all callbacks that were registred for that key
registry.execute('event-key');

Passing arguments

You can pass any arguments to the callbacks when you execute them

// execute all callbacks that were registred for that key
registry.execute('event-key', arg1, arg2, arg3);

Returning results

The execute method returns an array with the results returned from the callbacks.

Removing a callback

When you add a new callback a function is returned that can be used to unsubscribe

// A callback that will be called just the first time
var unsubscribe = registry.add('event-key', function(){
    console.log('the event occurred');
    unsubscribe();
});

Change log

2.7.2 dependencies update
2.7.1 fixed potentional memory leak
2.6.0 added replayArgumentsArr that allows you to replay arguments to a new callback
2.5.0 added clearKey method that removes a key from the registry
2.3.2
- fix case where unsubscribe function removes all subscriptions with the same callback reference
2.1.1
- return empty array as result if no subscribers
- catch errors in user callbacks (returns undefined in the result if error)