Question

在下面的代码中，我正在验证用户输入的用户名和密码以及我的mongo数据库中的详细信息。如果成功，则重定向到/ main route（index.ejs）。我收到错误： - 回调不是函数。我是nodejs的新手。我无法弄清楚我收到此错误的位置和原因。

app.js

  var express = require('express');
  var app = express();
  var path = require('path');
  var favicon = require('serve-favicon');
  var logger = require('morgan');
  var cookieParser = require('cookie-parser');
  var bodyParser = require('body-parser');
  var urlencoder = bodyParser.urlencoded({extended : true});
  var MongoClient = require('mongodb').MongoClient;
  var url = 'mongodb://<username>: <password>@ds141434.mlab.com:41434/teacherspro'; // using mLab 
  app.set('view engine' , 'ejs');           // ejs as view engine

var index = require('./routes/index');    // providing routes
var users = require('./routes/users');

app.set('views', path.join(__dirname, 'views')); 


app.use(logger('dev'));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/main', index);       
app.use('/users', users);


 app.get('/login' , function(req,res,next){  // rendering homepage
    console.log('\r');    
    res.render('login');   // rendering login.ejs
    console.log('rendered master page!');
    next();
 });

MongoClient.connect(url , function(err,db){
    if (err) return;

    app.post('/login' , urlencoder , function(req,res,next){
        app.use(bodyParser.json());

    var UserName = req.body.UserName;
    var Password = req.body.Password;

     db.collection('project1').find({ '$and' : [ {"UserName" : UserName} , {"Password" : Password} ]} , {_id : 0}).forEach(function(pes){  // authenticating username and password

         if(true)
          {
              console.log(pes);
              res.redirect('/main');
          }
      });
   });
    db.close(); 
    next();
});

app.listen(5050);      
module.exports = app;

Index.js

var express = require('express');
var router = express.Router();

router.get('/', function(req, res) {
     MongoClient.connect(url , function(err,db){
        if (err) return;
        db.collection('project1').find({"UserName" : "karan"} , {_id : 0}).forEach(function(pes){
            console.log(pes);
            res.render('index', {Name : pes});
        });
   });
});

module.exports = router;

login.ejs

<form id = 'login' method = POST action = '/login'> 
        <label for = 'Username'> UserName </label>
        <input type = 'text' name = 'UserName' value = ''>
        <br />
        <label for = 'Password'> Password </label>
        <input type = 'password' name = 'Password' value = ''>
        <br />
        <center> <input type ="submit" value = "submit" /> </center>
        <br />
</form>

Answer 1

发布回调具有以下形式： app.post（路径，回调）;

检查docs。 app.post

只需删除urlencoder param。

Nodejs：回调不是一个函数

1 个答案: