2013-12-19 20 views
0

我需要等待幾個異步調用完成才能恢復執行。我嘗試使用async以下代碼。使用async.each等待多個異步調用

asana.getUsers(null, function(error, resp){ 
    async.each(resp.data, function(user, cb) { 
     console.log("Get info for user : ", user.id); 
     asana.getUser(user.id, null, function(error, userResp){ 
      console.log("user response: ", userResp.data.id); 
      userEmailList.push({ 
       id : userResp.data.id, 
       name: userResp.data.name, 
       email : userResp.data.email 
      }); 
      cb(null); 
     }); 
     //cb(null); Should the call be here?? 
    }, function(err){ 
     console.log("getUsers is done now"); 
    }); 
}); 

我得到的日誌是:

 
Get info for user : xxxxxxxxxxxx 
Get info for user : yyyyyyyyyyyy 
Get info for user : zzzzzzzzzzzz 
Get info for user : aaaaaaaaaaaa 
user response: yyyyyyyyyyyy 

/Code/javaScript/NodeWorkspace/asana-api/mail.js:23 
      console.log("user response: ", userResp.data.id); 
               ^
TypeError: Cannot read property 'data' of null 
    at /Code/javaScript/NodeWorkspace/asana-api/mail.js:23:43 
    at Request._callback (/Code/javaScript/NodeWorkspace/asana-api/lib/asana.js:77:13) 
    at Request.self.callback (/Code/javaScript/NodeWorkspace/asana-api/node_modules/request/main.js:119:22) 
    at Request. (/Code/javaScript/NodeWorkspace/asana-api/node_modules/request/main.js:525:16) 
    at Request.EventEmitter.emit (events.js:95:17) 
    at IncomingMessage. (/Code/javaScript/NodeWorkspace/asana-api/node_modules/request/main.js:484:14) 
    at IncomingMessage.EventEmitter.emit (events.js:117:20) 
    at _stream_readable.js:883:14 
    at process._tickCallback (node.js:415:13) 

我理解第一次登錄,但爲什麼是console.log("user response: ", userResp.data.id);線獲取調用與userRespnull

我希望它不是一些愚蠢的錯誤。提前致謝。

P.S:基本上我需要得到Asana用戶,然後獲取每個用戶的信息並存儲在var userEmailList中。

+0

你檢查了'錯誤'嗎? – thefourtheye

+0

我得到這個錯誤'用戶響應:錯誤[TypeError:無法調用未定義的'推''''' – CodeRain

+0

而不是'userResp.data.id'你能顯示'userResp'使用'檢查(對象) '模塊?你確定它應該是'userResp.data.id'而不是'userResp.id'嗎? – Tom

回答

0

userEmailList was undefined! 謝謝@ damphat。