Change variable value within async function - node.js

Question

var url = posts.paging.next;
for (var i = 0; i < 3; i++) {
    (function(url,i) {
request(url,{json:true}, function (error, response, body) {
  if (!error && response.statusCode == 200) {
  url = body.paging.next;
  console.log(i+"+++"+url)
  }
});
    })(url,i);
};//for

According to async request response (body.paging.next), İ want to change value of var url which is top of code .Please Help

NOTE: i'm trying to get all comments from facebook api , To do that , i need to get page links . Because of this , i wrote this codes , if you have any other alternative way please suggest them thanx

mscdex · Accepted Answer · 2014-09-02 00:27:59Z

1

Assuming that you're trying to perform the requests in sequence (e.g. the next request relies on the url from the previous request), you could do something like (using the async module):

var async = require('async');

// ...

var url = posts.paging.next, i = 0;

async.whilst(
  function() { return i < 3; },
  function(callback) {
    ++i;
    request(url, { json: true }, function(err, response, body) {
      // TODO: handle `err`
      //return callback(err);

      if (!err && response.statusCode === 200) {
        url = body.paging.next;
        console.log(i + '+++' + url);
        callback();
      }
    });
  },
  function(err) {
    // done!
  }
);

answered Sep 2, 2014 at 0:27

mscdex

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1 Comment

Erdi Over a year ago

this is correct answer , thank you so much , i was using async module differently some times , at this time you and async saved my time and i got some node.js experiance point :D

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