Use PHP and jQuery to achieve dynamic effects on web pages

In website development, dynamic effects can improve user experience and make the website more lively and interesting. This article will introduce how to use PHP and jQuery to achieve dynamic effects on web pages. For beginners, this article will provide enough basic knowledge, and for developers with certain experience, this article can also provide some new ideas and techniques.

1. Understand PHP and jQuery

First of all, we need to understand PHP and jQuery. PHP is a server-side scripting language. It was originally used to write dynamic websites. It can be combined with HTML to write the website front-end to display dynamic data. jQuery is a JavaScript-based library that can simplify the writing and operation of JavaScript, making JavaScript easier to use.

2. Use PHP to implement dynamic data

In website development, PHP is usually used to dynamically generate html pages and dynamically obtain data. For example, when displaying news on a website, we cannot manually edit the html code of each news item one by one. At this time, PHP can dynamically generate HTML code by reading the news content in the news database, and embed it into the web page. The following is a sample code that will obtain the news title and time from the database and dynamically generate a web page card:

<?php
// 连接数据库
$conn = mysqli_connect('localhost', 'root', 'password', 'news');

// 获取数据
$result = mysqli_query($conn, 'SELECT * FROM news ORDER BY time DESC');
while ($row = mysqli_fetch_assoc($result)) {
  // 动态生成html代码
  echo '<div class="news-card">';
  echo '<h3>' . $row['title'] . '</h3>';
  echo '<p class="time">' . $row['time'] . '</p>';
  echo '<p>' . $row['content'] . '</p>';
  echo '</div>';
}
?>

In this code, we use PHP to obtain the news content in the news database and pass The while loop statement dynamically generates html code. The mysqli_query statement in the code is used to obtain data from the database, and the mysqli_fetch_assoc statement is used to convert the obtained data into a PHP array for processing.

3. Use jQuery to achieve dynamic interaction

In addition to PHP, we can also use jQuery to achieve dynamic interaction on web pages. For example, to display a picture gallery on a web page, we can add thumbnails of the pictures and display the larger images on the page when the thumbnail is clicked. The following is a sample code that uses jQuery to event-bind all thumbnails to achieve the dynamic effect of clicking on a thumbnail to display a large image:

$(document).ready(function() {
  // 绑定所有缩略图的click事件
  $('.thumbnail').click(function() {
    // 获取当前点击的缩略图对应的大图url
    var imageUrl = $(this).data('image-url');
    
    // 在页面上展示大图
    $('.large-image').attr('src', imageUrl);
  });
});

In this code, we use jQuery's ready function to Wait for the web page DOM elements to be loaded before executing the code. Then, use jQuery's click function to add click events to all thumbnails and obtain the large image URL corresponding to the clicked thumbnail. Finally, use jQuery's attr function to set the src attribute of the large image to the obtained url.

4. Summary

This article introduces how to use PHP and jQuery to achieve dynamic effects on web pages. Through PHP's dynamic data generation, we can display the latest data on the web page; and through jQuery's dynamic interaction, we can achieve richer interactive effects. These technologies are very important for website development. I hope this article can bring you some inspiration.

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