How to dynamically modify html in nodejs
As web applications mature and develop, more and more developers are starting to use Node.js to build back-end applications. Node.js is an open source server-side JavaScript environment for building high-performance and scalable web applications. It provides some very useful modules and libraries, including a template engine capable of generating HTML.
In this article, we will explore how to use Node.js to dynamically modify HTML. We'll first introduce some commonly used template engines and then discuss how to use them with Node.js. Finally, we will demonstrate some practical examples to help you better understand and practice these techniques.
Commonly used template engines
Before starting to use template engines, we need to understand the differences between different template engines and their advantages and disadvantages. The following are some commonly used template engines:
- EJS: EJS is a JavaScript-based template engine that can help us embed dynamic data in HTML code using JavaScript syntax. Its main advantage is that it is easy to learn and use, while you can also use it for client-side and server-side rendering.
- Handlebars: Handlebars is another JavaScript-based template engine that allows us to embed dynamic data in HTML code using handlebars syntax. Its main advantages are great compatibility, as it can be used for both client-side and server-side rendering, and has very good performance.
- Jade: Jade is a character-based template engine that helps us embed dynamic data in HTML code using indentation and spaces. Its advantages are concise syntax and easy maintenance.
Using Template Engines with Node.js
Now that we understand the different template engines, we can start using them to dynamically modify HTML. Here are some steps for using a template engine with Node.js:
- Install the template engine: You first need to install the template engine of your choice. In this example, we will use EJS as our template engine. To install EJS, run the following command:
npm install ejs --save
- Configure Express application: To create our application, we will use the Express framework for Node.js. To start using Express, you need to install it and then set it up in your application. Here is the sample code:
const express = require('express');
const app = express();
app.set('views', './views');
app.set('view engine', 'ejs');
app.get('/users', (req, res) => {
const users = [
{ name: 'Alice', email: 'alice@example.com' },
{ name: 'Bob', email: 'bob@example.com' },
{ name: 'Charlie', email: 'charlie@example.com' },
];
res.render('users', { users });
});
app.listen(3000, () => {
console.log('listening on port 3000');
});In this application, we set up the application's view directory and view engine, and provide a simple route handler that will render a named A view for "users" and pass an object to the view that contains an array named "users".
- Create view file: Next, we need to create a view file named "users.ejs". This file will contain dynamic data and HTML code. The following is the sample code:
<!doctype html>
<html>
<head>
<title>Users</title>
</head>
<body>
<h1>Users</h1>
<ul>
<% users.forEach(user => { %>
<li><%= user.name %> - <%= user.email %></li>
<% }); %>
</ul>
</body>
</html>In this view file, we use the syntax of the EJS template engine to embed dynamic data. We used a forEach loop to loop through the users array and used the <% %> tag in the HTML code to execute the JavaScript code. We also use the <%= %> tag to embed user data.
- Run the application: Finally, we need to run our application. To run the application, run the following command:
node app.js
Then open a browser and visit http://localhost:3000/users. You should be able to see a page with three users, each including a name and email address.
Summary
In this article, we explored how to dynamically modify HTML using Node.js and a template engine. We introduced some commonly used template engines and showed how to use EJS to combine them. By using these technologies, you can easily generate dynamic HTML from your web applications and provide a powerful user experience.
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