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listener-collection
Advanced tools
This library extends the standard event mechanism with ability to wait until all asynchronous events are processed.
npm install listener-collection
var ListenerCollection = require("listener-collection");
var liseners = new ListenerCollection();
listeners.add("listener1", function(param1, param2, next) {
setTimeout(function() {
console.log("listener");
next();
}, 100);
});
listeners.add("listener2", function(param1, param2, next) {
setTimeout(function() {
console.log("listener2");
next();
}, 200);
});
listeners.fire("A", "B", function() {
console.log("both listeners are processed now");
});
var ListenerCollection = require("listener-collection");
var liseners = new ListenerCollection();
listeners.add("a name", function(param1, param2) {
console.log("listener catch");
return promise;
});
listeners.fire("A", "B").then(function() {
console.log("everything is done");
});
listeners.add("a name", context, function() {
//this runs bound to context
});
Listeners are executed one by one in order they were added. If you want to add a listener to a particular position you can use insert
and specify the condition when the listener should be invoked.
listeners.add("listener1", function() { ... });
listeners.add("listener2", function() { ... });
listeners.insert({ after: "listener1" }, "listener3", function() { ... });
Alternatively you can also use before
instead or together with after
.
listeners.add("test", function () { });
listeners.remove("test");
listeners.post(function() {
console.log("this runs after the listeners are invoked");
});
listeners.pre(function() {
console.log("this runs before the listeners are invoked");
});
listeners.postFail(function(err) {
console.log("this runs after the listeners are invoked when one of the listeners fails");
});
MIT
FAQs
node.js library adding async support to events
The npm package listener-collection receives a total of 4,478 weekly downloads. As such, listener-collection popularity was classified as popular.
We found that listener-collection demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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