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PHP development: How to implement the article reading progress bar function

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PHP development: Implementing the article reading progress bar function

With the popularity of mobile devices and the development of the Internet, people have an increasing demand for reading web content. In order to improve the user experience and allow users to understand their reading progress in the article more intuitively, the article reading progress bar function came into being.

The article reading progress bar function is mainly implemented through JavaScript combined with PHP. Below I'll detail how to implement this functionality, including specific code examples.

Page structure
First, we need to create a simple HTML page structure to display the article content and reading progress bar. In the page, we will use some CSS styles and JavaScript scripts, please make sure to introduce them correctly.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>文章阅读进度条</title>
    <!-- 引入样式表 -->
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div class="progress-bar"></div>
        <div class="article-content" id="articleContent">
            <!-- 文章内容 -->
        </div>
    </div>
    <!-- 引入JavaScript脚本 -->
    <script src="script.js"></script>
</body>
</html>

CSS Style
We need to define some CSS styles to beautify the page and read the progress bar. Here is just a simple style example, you can customize the style according to actual needs.

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.progress-bar {
    width: 0;
    height: 5px;
    background-color: #e0e0e0;
}

.article-content {
    margin-top: 20px;
    line-height: 1.5;
    font-size: 16px;
}

JavaScript Script
Next, we need to implement the article reading progress bar function in JavaScript script. The specific implementation principle is to update the width of the reading progress bar by capturing the user's scrolling event, calculating the position of the scroll bar, and converting the scroll bar position into a percentage.

window.addEventListener('scroll', function() {
    // 获取文章内容元素
    var articleContent = document.getElementById('articleContent');
    
    // 文章内容的实际高度
    var contentHeight = articleContent.clientHeight;
    
    // 视口的高度
    var windowHeight = window.innerHeight;
    
    // 文章内容距离视口顶部的高度
    var contentTop = articleContent.getBoundingClientRect().top;
    
    // 计算滚动条的位置
    var scrollPercent = (contentTop + windowHeight) / contentHeight;
    
    // 更新阅读进度条的宽度
    var progressBar = document.querySelector('.progress-bar');
    progressBar.style.width = (scrollPercent * 100) + '%';
});

PHP application
Finally, we use PHP to dynamically generate article content. Here is an example of reading the contents of a text file.

<?php
// 读取文章内容
$articleContent = file_get_contents('article.txt');

// 将文章内容输出到页面
echo '<div class="article-content" id="articleContent">';
echo $articleContent;
echo '</div>';
?>

The above are all code examples to implement the article reading progress bar function. You can modify and optimize the above code according to your actual needs. I hope this article is helpful to you and I wish you good luck in your development work!

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