All Questions
19
questions
1
vote
1
answer
887
views
Node js Child process event emitter vs callbacks
Is there any difference between attaching callbacks or event listeners for child process in nodejs. like -
const execute = require('child-process').exec;
const process = execute('ping -n 1 www.google....
- 111
0
votes
1
answer
752
views
NodeJS, HTTP Request doesn't Call a Callback Sometimes
I'm developing a Request service under Nodejs. I'm using it in production for more than a year and it works fine, however, there are cases when it is stuck. It happens rarely on a particular kind of ...
- 3,353
2
votes
1
answer
35
views
Should I use callbacks for events?
While browsing some old documentation for express, I found this example that uses callbacks for the "close" event:
app.get('/page/', function (req, res) {
res.writeHead(200, { /* . . . */ );
...
- 121
0
votes
1
answer
241
views
Javascript / node.js - callbacks inside Promise
i have some callbacks inside my promise:
var res = new Promise(resolve => {
console.log('trig1');
var out = fs.createWriteStream(pathToFile);
console.log('trig2');
out.on('finish', ...
- 1,466
1
vote
1
answer
331
views
in Node.js- Is there any relationship between Events (EventEmitter and Listener Function objects) and the asynchronous callbacks
I am exploring Node.js.I understand that Node.js core API is built around the idiomatic asynchronous event-driven architecture
Now, by this I guess it means every time an asynchronous Function is ...
- 41
1
vote
1
answer
3k
views
Node Extracting zip file async using callbacks or events?
I have to write a module whose task is to extract a zip file given two parameters (zip file's path, directory where to extract's path) which should expose a method to perform the task and then trigger ...
- 301
0
votes
3
answers
44
views
NODEJS - Can't set headers after they are sent
I have function, that executes when 'dataCompiled' event fires, it looks like his:
eventEmitter.on('dataCompiled', function () {
json = JSON.stringify({
conversations: convs
...
- 5,402
3
votes
1
answer
1k
views
In node.js, when to use events, when to use a straight callback function?
It seems to me that the "core" node.js callback syntax, i.e.
function foo(data, callback) {
callback(false, data2);
}
is semantically superseded by events, except that
With events, you lose the ...
- 483
5
votes
2
answers
3k
views
Call a function after all currently scheduled callbacks are executed (node)
I am using a streaming multipart/form-data parser to handle file and field uploads. Whenever a new field or file is parsed an event is fired and I perform some processing. After all fields and files ...
- 2,129
0
votes
0
answers
61
views
How can I bind data to an event in node.js
Here is a boiled down version of the sort of code I've written:
var cb_gen, item, list, label, token;
cb_gen = function (token_string) {
return function (data) {
var msg = "logout of [" +...
- 21
0
votes
1
answer
182
views
Node.js, assigning callback function for event 'data'
How can I assign a call back function for event 'data' and give it more then 1 standard parameter ?
Here is my script :
var http = require('http');
var server = http.createServer().listen(8080);
...
- 29
0
votes
0
answers
216
views
Node.js: bottlenecks when registering very large number of listeners and callbacks?
I'm working on an application where a single server might receive as many as 100,000 requests for the results of the same, slow-executing (up to 5s) process. That means an EventEmitter with a crap-...
- 4,539
1
vote
2
answers
146
views
How to run a function only after multiple functions have been resolved?
I have several functions which essentially prep up my app.
once these prep functions have finished, i want to run the main loop of my app.
So while the prep functions are async with each other, the ...
- 2,883
1
vote
1
answer
96
views
The best practice to force x clients to wait for the callback of client y in node.js
I'm trying to implement a cache system for a data-delivery tool for different clients with node.js.
It's an http-service and I use express to handle the requests. My cache-system needs to support ...
- 13
2
votes
1
answer
189
views
Node.js - Better way to manage javascript scopes between callbacks?
I'm working with Node.JS and have two objects that I move between via callbacks. I came up with a solution to maintain scope references to the correct object. I'm trying to figure out if there's a ...
- 23