我是初学者谁试图学习nodejs和mongodb通过学习登录注册注销..最近我试图添加功能的文件上传，但它显示这样的错误.
22| </thead>
23| <tbody>
>> 24| <% for(var i=0; i < data.length > 0; i++) {%>
25| <tr>
26| <td><%= data[i].filespath %></td>
27| <td>
data is not defined我正在把我的项目注册登录功能和文件加载功能结合起来，但是它不起作用。我想知道是什么问题。有人能帮我检查一下代码，指出我做错了什么吗？
这是我的服务器. js
// using express JS
var express = require("express");
var app = express();
// express formidable is used to parse the form data values
var formidable = require("express-formidable");
app.use(formidable());
// use mongo DB as database
var mongodb = require("mongodb");
var mongoClient = mongodb.MongoClient;
// the unique ID for each mongo DB document
var ObjectId = mongodb.ObjectId;
// receiving http requests
var httpObj = require("http");
var http = httpObj.createServer(app);
// to encrypt/decrypt passwords
var bcrypt = require("bcrypt");
// to store files
var fileSystem = require("fs");
const bodyParser = require('body-parser');
const multer = require('multer');
const mongoose = require('mongoose');
const path = require('path');
// to start the session
var session = require("express-session");
app.use(session({
secret: 'secret key',
resave: false,
saveUninitialized: false
}));
// define the publically accessible folders
app.use("/public/css", express.static(__dirname + "/public/css"));
app.use("/public/js", express.static(__dirname + "/public/js"));
app.use("/public/img", express.static(__dirname + "/public/img"));
app.use("/public/font-awesome-4.7.0", express.static(__dirname + "/public/font-awesome-4.7.0"));
app.use("/public/fonts", express.static(__dirname + "/public/fonts"));
const filePath = path.resolve(__dirname,'public');
app.use(express.static(filePath));
app.use(bodyParser.urlencoded({extended:false}))
// using EJS as templating engine
app.set("view engine", "ejs");
// main URL of website
var mainURL = "http://localhost:3000";
// global database object
var database = null;
// app middleware to attach main URL and user object with each request
app.use(function (request, result, next) {
request.mainURL = mainURL;
request.isLogin = (typeof request.session.user !== "undefined");
request.user = request.session.user;
// continue the request
next();
});
// start the http server
http.listen(3000, function () {
console.log("Server started at " + mainURL);
// connect with mongo DB server
mongoClient.connect("mongodb://localhost:27017", {
useUnifiedTopology: true
}, function (error, client) {
// connect database (it will automatically create the database if not exists)
database = client.db("file_transfer");
console.log("Database connected.");
// logout the user
app.get("/Logout", function (request, result) {
request.session.destroy();
result.redirect("/");
});
// show page to login
app.get("/Login", function (request, result) {
result.render("Login", {
"request": request
});
});
// authenticate the user
app.post("/Login", async function (request, result) {
var email = request.fields.email;
var password = request.fields.password;
var user = await database.collection("users").findOne({
"email": email
});
if (user == null) {
request.status = "error";
request.message = "Email does not exist.";
result.render("Login", {
"request": request
});
return false;
}
bcrypt.compare(password, user.password, function (error, isVerify) {
if (isVerify) {
request.session.user = user;
result.redirect("/");
return false;
}
request.status = "error";
request.message = "Password is not correct.";
result.render("Login", {
"request": request
});
});
});
// register the user
app.post("/Register", async function (request, result) {
var name = request.fields.name;
var email = request.fields.email;
var password = request.fields.password;
var reset_token = "";
var isVerified = true;
var verification_token = new Date().getTime();
var user = await database.collection("users").findOne({
"email": email
});
if (user == null) {
bcrypt.hash(password, 10, async function (error, hash) {
await database.collection("users").insertOne({
"name": name,
"email": email,
"password": hash,
"reset_token": reset_token,
"uploaded": [],
"sharedWithMe": [],
"isVerified": isVerified,
"verification_token": verification_token
}, async function (error, data) {
request.status = "success";
request.message = "Signed up successfully. You can login now.";
result.render("Register", {
"request": request
});
});
});
} else {
request.status = "error";
request.message = "Email already exist.";
result.render("Register", {
"request": request
});
}
});
// show page to do the registration
app.get("/Register", function (request, result) {
result.render("Register", {
"request": request
});
});
// home page
app.get("/", function (request, result) {
result.render("index", {
"request": request
});
const fileSchema = new mongoose.Schema({
filespath:String
})
const fileModel = mongoose.model('filesdemo',fileSchema)
app.get('/',(req,res)=>{
fileModel.find((err,data)=>{
if(err){
console.log(err)
}
if(data){
console.log(data)
res.render('index',{data:data})
}
else{
res.render('index',{data:{}})
}
})
})
app.post('/',upload.single('file'),(req,res)=>{
const x= 'uploads/'+req.file.originalname;
const files = new fileModel({
filespath:x
})
files.save((err,data)=>{
if(err){
console.log(err)
}
else{
console.log('data',data)
res.redirect('/')
}
})
})
app.get('/download/:id',(req,res)=>{
fileModel.find({_id:req.params.id},(err,data)=>{
if(err){
console.log(err)
}
else{
const path= __dirname+'/public/'+data[0].filespath;
res.download(path);
}
})
})
app.get('/delete/:id', (req, res) => {
fileModel.find({_id: req.params.id}, (err, data) => {
if(err) {
console.log(err);
res.send(err);
} else {
const path= __dirname+'/public/'+data[0].filespath;
fs.unlink(path, (err) => {
if (err) throw err;
console.log(path + ' was deleted');
});
fileModel.deleteOne({ _id: req.params.id }, (err) => {
if (err) {
console.log(err);
res.send(err);
} else {
console.log('File deleted successfully');
res.send('File deleted successfully');
}
});
}
});
});
});
});
});这是我的视图/index.ejs，作为主页
<%- include ("includes/header") %>
<center>
<h2>Upload Files</h2>
<form action="/" method="POST" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="Upload">
</form><br><br><br><br>
</center>
<h2>Download Files</h2>
<table>
<thead>
<tr>
<td>
image
</td>
<td>
download
</td>
</tr>
</thead>
<tbody>
<% for(var i=0; i < data.length > 0; i++) {%>
<tr>
<td><%= data[i].filespath %></td>
<td>
<form action="/download/<%= data[i]._id %>" method="GET">
<input type="submit" value="Download">
<form action="/delete/<%= data[i]._id %>" method="GET">
<input type="submit" value="Delete">
</form>
</td>
</tr>
<% } %>
</tbody>
</table>
<%- include ("includes/footer") %>我很抱歉，如果代码有点混乱，因为我仍然是初学者试图学习。这意味着很多我，如果你能帮助我与此。谢谢了很多。
1条答案
按热度按时间mspsb9vt1#
根据mongoose的API文档，
find调用的第一个参数应该是查询。因此，代替：
我觉得你想要的是：
这将返回所有文档，因为传递空对象
{}意味着执行搜索查询，而不限制MongoDB。希望这有帮助：）