On Jan 30, 2015, at 4:33 AM, Atul K wrote:
>
> I am working on node.js http server. The Server is connected to mongodb. I am
> requesting a post request to the server to get documents from mongodb. But
> the post response is not waiting for mongodb callback to complete. And
> therefore I am not getting required output on the client side. How to handle
> this?
>
> http.createServer(function(request, response) {
> if(request.method == "POST") {
> var body = '';
> request.on('data', function(chunk) {
> console.log(chunk.toString());
> body += chunk;
> });
> request.on('end', function() {
> MongoClient.connect("mongodb://localhost:27017/exampleDb",
> function(err, db) {
> if(err) {
> console.log("We are not connected");
> }
> else {
> var sysInfo = db.collection('sysInfo');
> var jsonObj = sysInfo.find().toArray();
> response.writeHead(200, {'Content-Type': 'text/plain'});
> response.end(jsonObj);
> }
> });
> })
> }
> });
I'm not sure which node mongodb module you're using, but undoubtedly an
operation like find() will be asynchronous--a request will be sent to the
mongodb server, and it will take some time to complete, and when it is
completed, your callback will be called with the resuls. You will need to
consult the documentation of whichever node mongodb module you're using to see
how it expects you to provide the callback that it will call when the
asynchronous operation is complete.
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