Reactivity in all its glory, but sometimes you just need a plain old event bus.
meteor add lookback:eventbus
This package runs both on the server and client.
Create bus objects (preferrably globals) by calling the exported EventBus function:
Bus = EventBus();Three methods are exposed along with many aliases, matching your preference:
Aliases: add, send, emit, trigger
dispatch(event:String, [data...]);Trigger an event and sends it off to the bus. Call with the event name and as many arguments with as many types as you want:
Bus.dispatch('MyEvent', 'Important info string', [1, 2], {foo: 'bar'});Aliases: on
register(event:String, handler:Function);Register a listener on the bus and handle it with a handler function. The data you sent (if any) in dispatch will be available as arguments to the handler.
Bus.register('MyEvent', function(str, arr, obj) {
console.log(str);
// => 'Important info string'
console.log(arr);
// => [1, 2]
console.log(obj);
// => {foo: 'bar'}
});Aliases: off, deregister
remove(event:String, [handler:Function]);Stop listening to event completely, or remove a single handler only.
// Remove specialHandler only.
Bus.remove('MyEvent', specialHandler);
// Remove all listeners to 'MyEvent'.
Bus.remove('MyEvent');// In some init file.
Bus = EventBus();// Somewhere else.
Meteor.methods({
addPost: function(title, text) {
check(title, String);
check(text, String);
var post = {
title: title,
text: text,
author: Meteor.userId()
};
Posts.insert(post, function(err, postId) {
if(!err) {
// Add the post id and send off to bus!
Bus.dispatch('posts/new', _.extend(post, {_id: postId}));
}
});
}
});// Somewhere completely else (in a notification-center.js file perhaps?)
Bus.register('posts/new', function(post) {
check(post, {
_id: String,
title: String,
text: String,
author: String
});
// Send email to subscribers.
var subscribers = Posts.getSubscribers(post._id);
EmailNotifications.sendSubscriptionEmail(subscribers, post);
// Perhaps some analytics tracking?
Analytics.track('New Post', post._id);
// In-app notifications?
Notifications.newPost(post._id);
// ..
});Run tests with:
make testOr check them out in browser on localhost:5000:
meteor test-packages --port 5000 --driver-package respondly:test-reporter ./Made by Lookback.