'Uncaught ReferenceError: req is not defined' 当我使用 req.query.id 时在控制台中出现此错误
'Uncaught ReferenceError: req is not defined' 在控制台中出现这个错误 当我使用 req.query.id
这是我的 index.js 文件
const express = require("express");
const path = require("path");
const port = 8000;
const request = require('request');
const db = require('./config/mongoose');
const Contact = require('./models/contact');
const app = express();
app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'));
app.use(express.urlencoded({extended:true}));
app.use(express.static('assets'))
var contactList = [
{
name: 'Vijay chakradhari',
phone: '9222949595'
},
{
name: 'Vijay yaduvanshi',
phone: '9223949596'
},
{
name: 'Krishna chakradhari',
phone: '9224949595'
}
]
app.get('/', async function(req, res){
try {
const contacts = await Contact.find({});
return res.render('home',{
title: "Contact List",
contact_list: contacts
});
} catch (err) {
console.log("error in fetching contacts from db");
return;
}
});
app.get('/practice', function(req, res){
return res.render('practice',
{'title': 'It is only Practice'})
})
app.post('/create-contact', async function(req, res){
try {
const newContact = await Contact.create({
name: req.body.name,
phone: req.body.phone
});
console.log(newContact);
return res.redirect('back');
} catch (err) {
console.log('Error in creating a contact!');
}
});
app.get('/delete-contact', async function(req, res){
let id = req.query.id;
console.log('The contact id is:', req.query.id);
try {
await Contact.findByIdAndDelete(id);
res.redirect('back');
} catch (err) {
console.log('Error in deleting a contact in Database');
return;
}
});
app.listen(port, function(err){
if(err){
console.log('Error in running the server', err)
}
console.log('App is listening on port ' + port)
});
home.ejs
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title><%= title%></title>
<!--FONTAWESOME KIT-->
<script src=".js"
crossorigin="anonymous"></script>
<link rel="stylesheet" href="/css/home.css">
</head>
<body>
<!-- <h1>Rendered with EJS</h1> -->
<h1 id="page-heading">
<i class="fa-duotone fa-address-card fa-xl" style="--fa-secondary-
opacity: 0.5;"></i>
My Contact List</h1>
<div id="contact-list-container">
<ul>
<%
for (let i of contact_list){%>
<li class="contact">
<div class="details">
<p><%= i.name%>
<%= i.phone%>
</p>
</div>
<div class="delete-button">
<a href="/delete-contact/?id<%= i._id%>">
<i class="fas fa-window-close"></i>
</a>
</div>
</li>
<%}%>
</ul>
</div>
<form id="new-contact-form" action="/create-contact" method="post">
<input type="text" name="name" placeholder="enter your name"
required>
<input type="number" name="phone" placeholder="enter your phone"
required>
<button type="submit">Add Contact</button>
</form>
<script src="/JS/home.js"></script>
</body>
</html>
mongoose.js 文件
const mongoose = require('mongoose');
mongoose.connect('mongodb://127.0.0.1/contacts_list_db');
const db = mongoose.connection;
db.on('error', console.error.bind(console, 'error connecting to
database'));
db.once('open', function(){
console.log('Successfully connected to the DataBase');
});
Database collection
const mongoose = require('mongoose');
const contactSchema = new mongoose.Schema({
name:{
type: String,
required: true
},
phone:{
type: String,
required: true
}
})
const Contact = mongoose.model('Contact', contactSchema);
module.exports = Contact;
我希望在使用“删除联系人按钮”时获得联系人 ID，但我却收到此错误“未定义（请求）”
'Uncaught ReferenceError: req is not defined' 当我使用 req.query.id 时在控制台中出现此错误
回答如下：您可以在放置
console.log(req.query)console.log(req.query.id)req.query<div class="delete-button">
<a href="/delete-contact?id<%=i._id%>">
<i class="fas fa-window-close"></i>
</a>
</div>