PHP implements infinite scroll loading

With the development of the Internet, more and more web pages need to support scrolling loading, and infinite scrolling loading is one of them. It allows the page to continuously load new content, allowing users to browse the web more smoothly. In this article, we will introduce how to implement infinite scroll loading using PHP.

1. What is infinite scroll loading?

Infinite scroll loading is a method of loading web content based on scroll bars. Its principle is that when the user scrolls to the bottom of the page, background data is asynchronously retrieved through AJAX to continuously load new content. This loading method can prevent users from frequently switching pages and improve user experience.

2. Advantages of infinite scrolling loading

1. Fluency: infinite scrolling loading can prevent users from frequently switching pages and improve page fluency and user experience.

2. Enhance content attractiveness: Infinite scroll loading can continuously display new content and attract users to stay on the page.

3. Reduce server pressure: Paginated loading requires users to manually jump to the page, while infinite scroll loading only requires asynchronous requests for new content, which can reduce server pressure.

3. Steps to achieve infinite scrolling loading

1. Build the HTML structure

First, build a container in the page to display the loading of new content. Use the following structure:

<div id="load-more-container">
  <!-- 初始内容 -->
</div>

2. Bind scroll event

When the user scrolls to the bottom of the page, it needs to trigger the loading of new content. In order to implement this function, we need to listen to the window scroll event and determine whether it has scrolled to the bottom of the page. The code is as follows:

  $(window).on('scroll', function () {
    if ($(window).scrollTop() + $(window).height() == $(document).height()) {
      loadMore();
    }
  });

In the code, the loadMore function is the function used to load new content.

3. Asynchronous loading of data

When the user scrolls to the bottom of the page, he or she needs to request the background asynchronously to obtain new content. Here we use jQuery's AJAX method implementation.

function loadMore() {
  $.ajax({
    type: 'GET',
    url: 'load-more.php',
    data: {
      //传递参数
    },
    success: function (data) {
         $('#load-more-container').append(data);
    }
  });
}

Among them, load-more.php is the file path for background processing data. The next batch of data can be obtained through load-more.php and displayed as needed.

4. Implement paging

When implementing infinite scroll loading, we need to pay attention to data paging. In order to implement paging, we can add relevant logic to load-more.php and obtain corresponding data based on the current number of pages. The code is as follows:

$page = $_GET['page'];
$count = 10; // 每页条数
$start = ($page-1) * $count;

// 数据库查询语句
$sql = "SELECT * FROM `table` LIMIT $start, $count";

5. Summary

This article introduces how to use PHP to achieve infinite scrolling loading. By listening to scroll events and asynchronously requesting data from the background, we can achieve infinite scrolling and display data in pages as needed, improving page fluency and user experience.

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