NodeJS wait for function to finish

Asked Apr 17 '15 at 07:06

Active Apr 17 '15 at 07:20

Viewed 230 times

How can i wait for a function to complete, before executing another function in NodeJS?

Let's say thats my main function with db querys etc.

function main() {
    // Do some db querys here
    connection.query(query, function(err, rows) {
        if (err) throw err;
        for(var i = 0; i < rows.length; i++) {
            console.log('Got Row ' + i);
        }
    });
    // Do some other stuff here
    ...
}

And that's the function which is get called after the main() function above is completely finished.

function waitForMain() {
    console.log('Finally i was called!');
}

Is this possible with callbacks? Or are there other methods?

edited Apr 17 '15 at 07:20

asked Apr 17 '15 at 07:06

Luca Huber

You can use async.series. – Subburaj Apr 17 '15 at 07:07
2

Your function should take a callback or return a promise - the latter is more modern. – Benjamin Gruenbaum Apr 17 '15 at 07:08
If you don't want to use callback then you can use "Q" Module. I have mongoDb Implementation on my github. https://github.com/vishal41190/assignment8/tree/withq – vishal patel Apr 17 '15 at 07:10
Can you show us code of query which you executing inside `main` function? – Manwal Apr 17 '15 at 07:12
@Manwal i've added my query which get executed inside main. What i want is a callback if the db query got fully completed – Luca Huber Apr 17 '15 at 07:20
@vishalpatel Q is really old better use something modern – Benjamin Gruenbaum Apr 17 '15 at 07:29
@BenjaminGruenbaum What is the modern way? – vishal patel Apr 17 '15 at 07:32
Bluebird on the server, native on the client @vishalpatel – Benjamin Gruenbaum Apr 17 '15 at 07:33

NodeJS wait for function to finish

0 Answers0