CODEWITHSUNDEEP
javascriptjqueryajaxnode.jsasynchronous
xhallix
xhallix

Reputation: 3011

How to handle an ajax response which is asynchronous

I want to retrieve some data from my database in nodejs. Retrieving those data is an async request, as we well as the ajax request.

Client.js

$.ajax('localhost/Server').done(function(){

});

Server.js

 function cb(){
  // do stuff
 }

 // ajax request is going here
 function Server(req, res) {
   GetTheModelFromTheDbInAsyncWay(function(cb){
      cb();
   });
 }

 function GetTheModelFromTheDbInAsyncWay(cb) {
    //doing stuff to the db e.g getting the result of a query
    // ...
     cb(result);
 }

What technique do I need to use, to retrieve the aync server request in my async ajax request? I think it will be something like promised. But how can I pass it back to my ajax request since, the db request is async by itself

Hope I was able to make this clear

Upvotes: 0

Views: 60

Answers (1)

T.J. Crowder
T.J. Crowder

Reputation: 1074475

You're calling the argument you receive from GetTheModelFromTheDbInAsyncWay as though it were a function. Presumably it isn't. You should be using it (for instance, sending it or information derived from it via res.send):

// ajax request is going here
function Server(req, res) {
  GetTheModelFromTheDbInAsyncWay(function(data){ // Not `cb`, `data`
     // Use `data` here to produce the response you send via `res`
  });
}

Upvotes: 2

Related Questions