[HTML] HTML, CSS and JavaScript implementation of parsing vertical scrolling carousel effect

HTML, CSS and JavaScript implementation of parsing vertical scrolling carousel effect

In modern web development, the scroll carousel effect is one of the common interactive elements in web design. In this article, we will deeply analyze a piece of HTML, CSS and JavaScript code to implement a simple and efficient vertical scrolling carousel effect. Through this code, we can learn how to use the jQuery library and CSS to create a dynamic carousel component.

1. HTML structure

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 jQuery 库 -->
    <script src="https://code.jquery.com/jquery-3.6.4.min.js"></script>
    <style>
        #container {
      
      
            height: 300px;
            overflow: hidden;
            position: relative;
        }

        #content {
      
      
            position: absolute;
        }
    </style>
    <script>
        // JavaScript代码将在下文详细解释
    </script>
</head>
<body>
    <div id="container">
        <div id="content">
            <!-- 这里将生成的轮播内容动态添加 -->
        </div>
    </div>
</body>
</html>

In the HTML structure, we introduced the jQuery library and set up a #container container, which contains a #content container to store the carousel Content. Next, we will explain the JavaScript part of the code in detail.

2. JavaScript implementation

$(document).ready(function () {
    
    
    // 生成30个样例的<div>并追加到#content中
    for (var i = 1; i <= 30; i++) {
    
    
        $('#content').append('<div>轮播' + i + '</div>');
    }
    // 获取内容的高度
    var contentHeight = $('#content').height();

    // 克隆内容，实现无缝循环
    $('#content').append($('#content').clone());

    // 使用animate实现向上滚动
    function scrollUp() {
    
    
        // 向上滚动动画
        $('#content').animate({
    
    
            top: -contentHeight
        }, 10000, 'linear', function () {
    
    
            // 动画完成后将top重置为0，实现无缝滚动
            $(this).css('top', 0);
            // 递归调用滚动函数，实现连续滚动
            scrollUp();
        });
    }

    // 开始滚动
    scrollUp();
});

This JavaScript code operates DOM elements through the jQuery library to achieve a vertical scrolling carousel effect. Specific steps are as follows:

Use $(document).ready() to ensure that the code is executed after the page has finished loading.
generates 30 samples of through for loop, and appends them to the container. <div>#content
Get the height of the content, used to set the scroll distance.
Use clone method to clone content to achieve seamless loop scrolling effect.
Use the animate method to achieve the upward scrolling animation effect, and use linear to specify the easing function of the animation.
After the animation completes, reset top to 0 for seamless scrolling.
Recursively calls the scrollUp function to achieve continuous scrolling.
Code demo:

This example shows how to use HTML, CSS, and JavaScript to create a simple and smooth vertical scrolling carousel effect. By studying this code in depth, you will have a deeper understanding of using the jQuery library to manipulate DOM elements and achieve animation effects.