Question

I wish to make a call in Node.js somethine like this (i m using coffeescript for node.js)

test = [] //initially an empty array
list = []//an array with 10 json object

for li in list
  get_data url , li, (err,data) -> test.push data

my get_data method look like

get_data: (url, json_data, callback) ->
  throw "JSON obj is required" unless _.isObject(json_data) 
  post_callback = (error, response) ->
    if error
      callback(error)
    else
      callback(undefined, response)
    return
  request.post {url: url, json: json_data}, post_callback
  return

problem is I am not able to collect the result from request.post into the ‘test’ array
I Know I am doing something wrong in the for loop but not sure what

Answer 1

You don’t appear to have any way of knowing when all of the requests have returned. You should really consider using a good async library, but here’s how you can do it:

test = [] //initially an empty array
list = []//an array with 10 json object

on_complete = ->
  //here, test should be full
  console.log test
  return

remaining = list.length
for li in list
  get_data url , li, (err,data) ->
    remaining--
    test.push data
    if remaining == 0
      on_complete()