MongoDB-无法从数据库读取数据

Question

hi I am a newbie and am facing an issue.I am doing a rideshare cab application and am getting Cannot read property 'length' of undefined error in jade file.

My jade file is as follows:-

html
  body
    h1 Passengers List
    each user in users
      script(type='text/javascript').
        function checkboxlimit(checkgroup, limit){
        var checkgroup=checkgroup
        var limit=limit
        for (var i=0; i<checkgroup.length; i++){
        checkgroup[i].onclick=function(){
        var checkedcount=0
        for (var i=0; i<checkgroup.length; i++)
        checkedcount+=(checkgroup[i].checked)? 1 : 0
        if (checkedcount>limit){
        this.checked=false
        }
        }
        }
        }
      p Select your passenger below:
      form#world(name='man')
        input(type='checkbox', name='dude')
        |  li {passenger.name}
        br
      script(type='text/javascript').
        //Syntax: checkboxlimit(checkbox_reference, limit)
        checkboxlimit(document.forms.man.dude, 4)

In this file i am trying to display all the users and let the driver select four passengers..

Once done I will create a new jade file to display the driver and the passenger associated with the driver

The following is my serverjs snippet:-

app.post('/passenger',function(req,res){
        var user = new User({profile:{name:req.body.uname},
        type:"passenger",
        phone_no:req.body.contact,
        origin:{city:req.body.pick},
        destination:{city:req.body.drop}
      //  email:req.body.email,
    //    password:req.body.password
    })
         user.save();
       //  passengers.push(user)
       //  console.log(passengers)

        res.render('checkbox', {user: user});
       // res.redirect('/checkbox')
    });   

app.get('/checkbox',function(req,res){
        res.render('checkbox');
    });

my model is as follows:-

var userSchema = new mongoose.Schema({
  email: { type: String, unique: true, lowercase: true },
  password: String,
  facebook: String,
  google: String,
  origin: {city: String, state: String},
  destination: {city: String, state: String},
  price: Array,
  time: Date,
  phone_no: String,
  accepted:String,
  tokens: Array,
  type: String,
  profile: {
    name: { type: String, default: '' },
    gender: { type: String, default: '' },
    location: { type: String, default: '' },
    website: { type: String, default: '' },
    picture: { type: String, default: '' }
  },

  resetPasswordToken: String,
  resetPasswordExpires: Date
});

I cant seem to understand what is wrong in the code..Please help me out

Thanks

Answer 1

var x = {};
x.someProperty; //this is undefined
x.someProperty.length; // Cannot read property 'length' of undefined

So, you are trying to get the property of an undefined. Try to find in which part of the code you are trying to get length .

function checkboxlimit(checkgroup, limit) { pay attention to this line, checkgroup its undefined .

And this var checkgroup=checkgroup , var limit=limit is pointless.

=)