How to make a javascript carousel chart
How to make a JavaScript carousel?
With the development of Web front-end development, carousel images have become one of the common components of most websites and applications. However, I believe that many friends who are new to front-end development will ask, how to make a JavaScript carousel chart?
This article will introduce you to how to use JavaScript to create a carousel chart, and help you gradually understand the basic principles and common technologies for implementing carousel charts.
1. The basic principle of the carousel chart
The carousel chart, as the name suggests, is a group of pictures that can be played in a loop. It realizes automatic looping or manual switching through JavaScript, allowing users to browse through it. Multiple images or content.
The basic principle of the carousel chart is divided into two parts: HTML structure and JavaScript logic.
HTML structure:
HTML structure is the basis of the carousel chart. Its structure is roughly as follows:
<div class="carousel">
<ul class="carousel-list">
<li class="carousel-item"><img src="image1.jpg" alt="image1"></li>
<li class="carousel-item"><img src="image2.jpg" alt="image2"></li>
<li class="carousel-item"><img src="image3.jpg" alt="image3"></li>
<li class="carousel-item"><img src="image4.jpg" alt="image4"></li>
<li class="carousel-item"><img src="image5.jpg" alt="image5"></li>
</ul>
</div>Among them, .carousel is the carousel chart container, .carousel-list is the image list container, .carousel-item is the container for each individual image.
JavaScript logic:
JavaScript logic implements the core of the carousel chart, usually in the following ways:
1. Get the carousel chart page element, and use JavaScript code to select the HTML The .carousel element.
var carousel = document.querySelector('.carousel');2. Get the image list container and individual image container,
var list = carousel.querySelector('ul');
var items = carousel.querySelectorAll('.carousel-item');3. Get the width of the carousel image,
var itemWidth = items[0].offsetWidth;
4. Configure the switching interval and timing 5. Configure automatic playback and manual switching,
var delay = 3000; var interval;
2. Implement a simple carousel chart
Now, we have understood the basic principles of the carousel chart , and achieved the basic effect of the carousel chart through code. Below, we will implement a simple carousel chart based on this effect.
HTML structure:
function startCarousel() {
interval = setInterval(function(){
var left = parseInt(list.style.left) + itemWidth;
if(left <= itemWidth - list.offsetWidth) {
list.style.left = "0px";
} else {
list.style.left = left + 'px';
}
}, delay);
}
function stopCarousel() {
clearInterval(interval);
}JavaScript code:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Simple Carousel</title>
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body>
<div class="carousel">
<ul class="carousel-list">
<li class="carousel-item"><img src="img/1.jpg" alt="1"></li>
<li class="carousel-item"><img src="img/2.jpg" alt="2"></li>
<li class="carousel-item"><img src="img/3.jpg" alt="3"></li>
<li class="carousel-item"><img src="img/4.jpg" alt="4"></li>
</ul>
</div>
<script src="script.js"></script>
</body>
</html>CSS code:
var carousel = document.querySelector('.carousel');
var list = carousel.querySelector('ul');
var items = carousel.querySelectorAll('.carousel-item');
var itemWidth = items[0].offsetWidth;
var delay = 3000;
var interval;
// 自动播放
function startCarousel() {
interval = setInterval(function(){
var left = parseInt(list.style.left) + itemWidth;
if(left <= itemWidth - list.offsetWidth) {
list.style.left = "0px";
} else {
list.style.left = left + 'px';
}
}, delay);
}
// 手动切换
function stopCarousel() {
clearInterval(interval);
}
// 启动轮播
startCarousel();3. Carousel images to achieve multiple effects
Through the above example, we have learned how to make a simple carousel chart. However, usually carousel images do not only have the above effects, we can also achieve more practical carousel image effects through JavaScript.
1. Easing effect
Easing effect is the effect of changing the speed of each picture from fast to slow when switching. By using JavaScript, we can usually write like this:
.carousel {
position: relative;
overflow: hidden;
width: 400px; /* 轮播图容器的宽度 */
height: 300px; /* 轮播图容器的高度 */
}
.carousel-list {
list-style: none;
padding: 0;
margin: 0;
position: absolute;
width: ${(items.length * 100)}%;
}
.carousel-item {
float: left;
width: calc(100% / ${(items.length)});
}
.carousel-item img {
display: block;
width: 100%;
height: auto;
}2. Responsive layout
Responsive Web design is common sense in modern front-end design. In order to enable the carousel to support different screen sizes, To better adapt to the web layout, we need to make additional adjustments and optimizations.
function startCarousel() {
interval = setInterval(function(){
var left = parseInt(list.style.left) + itemWidth;
var startTime = Date.now();
var easing = function(t, b, c, d) {
return c * ((t = t / d - 1) * t * t + 1) + b;
};
var animate = function() {
var time = Date.now() - startTime;
var easingLeft = easing(time, parseInt(list.style.left), -itemWidth, delay);
if(time <= delay) {
list.style.left = easingLeft + 'px';
requestAnimationFrame(animate);
} else {
list.style.left = -itemWidth + 'px';
list.appendChild(items[0]);
}
};
requestAnimationFrame(animate);
}, delay);
}Among them,
vw The unit can specify the length as a percentage of the width of the viewport, and the carousel will maintain a responsive layout regardless of how the screen size changes. 4. Summary
So far, we have understood the basic principles and implementation methods of creating carousels through JavaScript. Through adjustments and optimizations, we can implement more carousel components with rich styles and effects, thus well meeting user needs for web content and services.
Of course, there are still many technical difficulties and operational details that need to be mastered in making carousels with JavaScript. I hope that everyone can gradually master these skills in actual development and continuously improve their programming abilities.
The above is the detailed content of How to make a javascript carousel chart. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1659
14
1415
52
1310
25
1258
29
1232
24
React's Role in HTML: Enhancing User Experience
Apr 09, 2025 am 12:11 AM
React combines JSX and HTML to improve user experience. 1) JSX embeds HTML to make development more intuitive. 2) The virtual DOM mechanism optimizes performance and reduces DOM operations. 3) Component-based management UI to improve maintainability. 4) State management and event processing enhance interactivity.
React and the Frontend: Building Interactive Experiences
Apr 11, 2025 am 12:02 AM
React is the preferred tool for building interactive front-end experiences. 1) React simplifies UI development through componentization and virtual DOM. 2) Components are divided into function components and class components. Function components are simpler and class components provide more life cycle methods. 3) The working principle of React relies on virtual DOM and reconciliation algorithm to improve performance. 4) State management uses useState or this.state, and life cycle methods such as componentDidMount are used for specific logic. 5) Basic usage includes creating components and managing state, and advanced usage involves custom hooks and performance optimization. 6) Common errors include improper status updates and performance issues, debugging skills include using ReactDevTools and Excellent
React Components: Creating Reusable Elements in HTML
Apr 08, 2025 pm 05:53 PM
React components can be defined by functions or classes, encapsulating UI logic and accepting input data through props. 1) Define components: Use functions or classes to return React elements. 2) Rendering component: React calls render method or executes function component. 3) Multiplexing components: pass data through props to build a complex UI. The lifecycle approach of components allows logic to be executed at different stages, improving development efficiency and code maintainability.
React's Ecosystem: Libraries, Tools, and Best Practices
Apr 18, 2025 am 12:23 AM
The React ecosystem includes state management libraries (such as Redux), routing libraries (such as ReactRouter), UI component libraries (such as Material-UI), testing tools (such as Jest), and building tools (such as Webpack). These tools work together to help developers develop and maintain applications efficiently, improve code quality and development efficiency.
Frontend Development with React: Advantages and Techniques
Apr 17, 2025 am 12:25 AM
The advantages of React are its flexibility and efficiency, which are reflected in: 1) Component-based design improves code reusability; 2) Virtual DOM technology optimizes performance, especially when handling large amounts of data updates; 3) The rich ecosystem provides a large number of third-party libraries and tools. By understanding how React works and uses examples, you can master its core concepts and best practices to build an efficient, maintainable user interface.
React: The Power of a JavaScript Library for Web Development
Apr 18, 2025 am 12:25 AM
React is a JavaScript library developed by Meta for building user interfaces, with its core being component development and virtual DOM technology. 1. Component and state management: React manages state through components (functions or classes) and Hooks (such as useState), improving code reusability and maintenance. 2. Virtual DOM and performance optimization: Through virtual DOM, React efficiently updates the real DOM to improve performance. 3. Life cycle and Hooks: Hooks (such as useEffect) allow function components to manage life cycles and perform side-effect operations. 4. Usage example: From basic HelloWorld components to advanced global state management (useContext and
React vs. Backend Frameworks: A Comparison
Apr 13, 2025 am 12:06 AM
React is a front-end framework for building user interfaces; a back-end framework is used to build server-side applications. React provides componentized and efficient UI updates, and the backend framework provides a complete backend service solution. When choosing a technology stack, project requirements, team skills, and scalability should be considered.
The Future of React: Trends and Innovations in Web Development
Apr 19, 2025 am 12:22 AM
React's future will focus on the ultimate in component development, performance optimization and deep integration with other technology stacks. 1) React will further simplify the creation and management of components and promote the ultimate in component development. 2) Performance optimization will become the focus, especially in large applications. 3) React will be deeply integrated with technologies such as GraphQL and TypeScript to improve the development experience.
