Web project using Node.js to implement online ordering function
In order to meet the fast-paced lifestyle of modern people, more and more restaurants have begun to implement online ordering services, allowing customers to reserve, order and pay more conveniently and quickly. This article will introduce how to use Node.js to implement a simple online ordering web project and provide code examples.
- Environment configuration
First you need to install Node.js and npm package manager. You can download the installation package from the official website or use the package manager to install it. After the installation is complete, open the command line tool and enter the following command to confirm the version.
node -v //输出node版本号 npm -v //输出npm版本号
- Project initialization
Use the npm package manager to initialize the project and generate the package.json file.
npm init -y
- Install dependent modules
In the project root directory, use npm to install the Express framework and other necessary modules.
npm install express body-parser ejs --save
Among them, Express is a commonly used Web application framework in Node.js, which can easily and quickly create a Web server; body-parser is used to process HTTP request bodies, including query string, form data, etc.; ejs is Template engine for rendering dynamic pages.
- Create Server
In order for users to access our web application, we need to create a server. In the project root directory, create a new server.js file and write the following code:
const express = require('express');
const app = express();
const port = 3000;
app.listen(port, function() {
console.log(`listening on port ${port}`);
});This code creates an Express application and listens to port 3000. Run the following command to start the server.
node server.js
Enter http://localhost:3000 in the browser, and you should see a "Cannot GET /" page, indicating that the server has been started.
- Writing page
In order to allow users to order food, some Web pages need to be created. In the project root directory, create a new views folder to store the pages. Create the index.ejs file and write the following code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>在线点餐</title>
</head>
<body>
<h1 id="欢迎来到我们的餐厅">欢迎来到我们的餐厅</h1>
<h2 id="我们的菜单如下">我们的菜单如下：</h2>
<ul>
<% for(var i = 0; i < menu.length; i++) { %>
<li><%= menu[i].name %> - <%= menu[i].price %>元</li>
<% } %>
</ul>
</body>
</html>This code uses the ejs template engine to render a menu page. Among them, menu is a dynamic variable, and data will be obtained from the server when the code is executed.
- Route processing
In order for the page to display menu data, a routing processing function needs to be written. In server.js, add the following code:
app.set('view engine', 'ejs');
app.get('/', function(req, res) {
const menu = [
{name: '鸡蛋炒饭', price: 12},
{name: '牛肉面', price: 15},
{name: '鱼香肉丝', price: 18},
{name: '红烧肉', price: 30},
];
res.render('index', {menu: menu});
});This code binds the route processing function to the GET request. When the root route / is accessed, the server will send the menu data and render the index.ejs template. , and pass the data to the template engine to finally generate an HTML page.
- Add CSS styles
In order to beautify the page, you need to add some CSS styles. Create a new public folder in the root directory and create a style.css file. Add the following code:
body {
background-color: #f5f5f5;
font-family: Arial, sans-serif;
text-align: center;
}
h1 {
margin-top: 50px;
}
ul {
list-style: none;
padding: 0;
}
li {
margin-top: 10px;
font-size: 18px;
font-weight: bold;
}This code defines the background color, font, alignment and other styles to make the page more beautiful.
- Modify the template file
In order to link the HTML page to the CSS style file, you need to modify the template file. Add the following code to the index.ejs file:
<link rel="stylesheet" href="/style.css" />
This code tells the browser to reference the style.css file in the public folder and add page styles.
- Summary
This article introduces how to use Node.js, Express and ejs template engine to implement an online ordering web project, and provides code examples. Through this article, readers can learn how to initialize the project, install dependent modules, create servers, write pages, handle routing, add CSS styles and other operations. Readers can further develop a more complete online ordering system based on these codes.
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