Create a simple Next.js application that loads assets in the form of images and CSS files and displays them on a web page.
create a new Next.js project using Create Next App.
add at least two images (e.g., image1.jpg and
image2.jpg) and one CSS file (styles.css) to
the public directory of your project.
create a React component called AssetGallery that
displays the two images from the public directory on the
web page.
use CSS to customize the appearance of the images. Make sure that the images are displayed side by side.
create a simple navigation to switch between the images. For
example, buttons or arrows to switch between image1.jpg and
image2.jpg.
implement a function or method to switch between the images when the user clicks on the buttons or arrows.
Here is a sample solution that fulfills the above requirements:
// pages/index.js
import React, { useState } from 'react';
import Image from 'next/image';
import styles from '../styles/Home.module.css';
const images = ['image1.jpg', 'image2.jpg']; // List of images
export default function Home() {
const [currentImageIndex, setCurrentImageIndex] = useState(0);
const handlePrevious = () => {
if (currentImageIndex > 0) {
setCurrentImageIndex(currentImageIndex - 1);
}
};
const handleNext = () => {
if (currentImageIndex < images.length - 1) {
setCurrentImageIndex(currentImageIndex + 1);
}
};
return (
<div className={styles.container}>
<h1>Asset Gallery</h1>
<div className={styles.gallery}>
<button onClick={handlePrevious} disabled={currentImageIndex === 0}>
Previous
</button>
<image
src={`/images/${images[currentImageIndex]}`}
alt={`image ${currentImageIndex + 1}`}
width={300}
height={200}
/>
<button onClick={handleNext} disabled={currentImageIndex === images.length - 1}>
Next
</button>
</div>
</div>
);
}In this sample solution, a simple Next.js application is created that
loads two images from the public directory and displays
them on a web page. Users can switch between the images using the
“Previous” and “Next” buttons. The CSS styles can be defined in the
styles.css file in the styles directory to
customize the appearance of the images.
Loading and processing Markdown files in Next.js applications is a common use case, especially for blogs, documentation pages or CMS-based websites. Here are the key steps for integrating Markdown into Next.js:
Additional packages are required to process Markdown files. Typical
packages are remark, remark-html and
gray-matter. They can be installed with npm or yarn:
npm install remark remark-html gray-matterMarkdown files are usually stored in the content or
pages directory. The file extension is .md or
.mdx for Markdown with JSX support.
In Next.js, you can use the Node.js file system module
(fs) to read in Markdown files. For example, you can list
and read in all files in a directory:
import fs from 'fs';
import path from 'path';
const postsDirectory = path.join(process.cwd(), 'content');
export function getSortedPostsData() {
const fileNames = fs.readdirSync(postsDirectory);
const allPostsData = fileNames.map(fileName => {
// Further processing steps
});
return allPostsData;
}With gray-matter you can extract the frontmatter and the
content of the Markdown files. Then use remark and
remark-html to convert the Markdown content into HTML:
import matter from 'gray-matter';
import { remark } from 'remark';
import html from 'remark-html';
export async function getPostData(id) {
const fullPath = path.join(postsDirectory, `${id}.md`);
const fileContents = fs.readFileSync(fullPath, 'utf8');
const matterResult = matter(fileContents);
const processedContent = await remark()
.use(html)
.process(matterResult.content);
const contentHtml = processedContent.toString();
return {
id,
contentHtml,
...matterResult.data,
};
}The processed Markdown content can then be rendered in Next.js
components by using dangerouslySetInnerHTML or by using a
suitable Markdown-to-React component.
The integration of Markdown in Next.js enables flexible content management. By using Node.js and additional packages, developers can efficiently process Markdown content and integrate it into their Next.js applications.
Create a Next.js application that reads Markdown files from a directory, converts the content to HTML and displays it on a web page. The application should display a list of blog posts that have been read from the Markdown files and allow the user to access individual posts.
create a new Next.js project:
npx create-next-app markdown-blog
cd markdown-bloginstall the required packages:
npm install remark remark-html gray-mattercreate a directory content in the root directory of
your project. Create some Markdown files for blog posts in it,
e.g. post-1.md, post-2.md, etc.
create a pages folder in the root directory and
create an index.js file in it. This will be the main page
of your application.
implement the getSortedPostsData and
getPostData functions as per the previous answer to read
and process the Markdown files.
create a page that displays the list of blog posts. Here is an
example of pages/index.js:
import Link from 'next/link';
import { getSortedPostsData } from '../lib/posts';
export default function Home({ allPostsData }) {
return (
<div>
<h1>Blog</h1>
<ul>
{allPostsData.map(({ id, date, title }) => (
<li key={id}>
<link href={`/posts/${id}`}>
<a>{title}</a>
</link>
<br />
{date}
</li>
))}
</ul>
</div>
);
}
export async function getStaticProps() {
const allPostsData = getSortedPostsData();
return {
props: {
allPostsData,
},
};
}create another page pages/posts/[id].js that
displays individual blog posts. Here is an example:
import { getPostData } from '../../lib/posts';
import marked from 'marked';
export default function Post({ postData }) {
return (
<div>
<h1>{postData.title}</h1>
<div dangerouslySetInnerHTML={{ __html: marked(postData.contentHtml) }} />
</div>
);
}
export async function getStaticPaths() {
// The paths to the Markdown files should be generated here
}
export async function getStaticProps({ params }) {
const postData = await getPostData(params.id);
return {
props: {
postData,
},
};
}getStaticPaths functions in
pages/posts/[id].js to dynamically generate the paths to
each blog post.make sure you add the CSS styles and layouts as needed to make your blog posts look appealing.
run your Next.js application with npm run dev and
check that it works correctly.
Forms are a central component of many web applications. In Next.js, forms are handled similarly to traditional React applications, with some specific features offered by the framework.
The creation of a form in Next.js begins with the definition of the
form structure in JSX. Conventional HTML form elements such as
<input>, <textarea> and
<select> can be used here. For example:
<form onSubmit={handleSubmit}>
<label htmlFor="name">Name:</label>
<input type="text" id="name" name="name" required />
<label htmlFor="email">Email:</label>
<input type="email" id="email" name="email" required />
<button type="submit">Send</button>
</form>The form state can be managed using React hooks such as
useState. Each form element is associated with a
corresponding state. For example:
const [name, setName] = useState('');
const [email, setEmail] = useState('');
const handleInputChange = (e) => {
const { name, value } = e.target;
if (name === 'name') setName(value);
if (name === 'email') setEmail(value);
};The function handleSubmit is called when the form is
submitted. This function can be asynchronous, for example to send data
to a server:
const handleSubmit = async (e) => {
e.preventDefault();
const formData = { name, email };
// An API call could be made here
};Next.js makes it possible to process form data on the server side.
This can be done via API routes that are defined within the
pages/api directory. These routes act as endpoints for HTTP
requests.
Form data can be validated on the client side in the submit function or on the server side in an API route. Libraries such as Yup or Formik can be used for more complex validations.