PHP+Ajax实现无刷新分页实例详解(附demo源码下载)，ajaxdemo
PHP+Ajax实现无刷新分页实例详解(附demo源码下载)，ajaxdemo
本文实例讲述了PHP+Ajax实现无刷新分页的方法。分享给大家供大家参考，具体如下：
注：这里使用到的一些类库在前面文章都能找到源代码，因此为了缩短文章篇幅，都指明链接所在。
本文讲解内容为： Ajax 实现无刷新分页、实现原理、代码展示、代码下载。
这里需要说明一些知识：
1、Ajax 无刷新页面的好处：提供良好的客户体验，通过 Ajax 在后台从数据库中取得数据并展示，取缔了等待加载页面而出现的空白状态；
2、那么，Ajax 无刷新页面是运行在动态页面（.php）？还是静态页面（.html/.htm/.shtml）？答案是：静态页面；
3、实现原理：通过前端 JS 脚本程序与 Ajax 相结合取得从动态页面返回的数据，并显示。
好了，下面进行代码讲解：
既然，是运行在静态页面上，我们首先先创建一个静态 HTML 页面，index.html 的代码清单如下。
index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="js/ajax.js"></script> <!-- 载入 Ajax 类库 -->
<title>Ajax 实现无刷新页面</title>
<style type="text/css">
body {
font-size:12px;
}
</style>
</head>
<body>
<div id="fpage">数据加载中...</div>
</body>
</html>
代码清单中，我们加载了一个 Ajax 类库，这个类库可以在 前面一篇《一个简单Ajax类库及使用方法实例分析》中找到
在这个静态页面中，只会显示一个“数据加载中....”，并没有任何数据。这时，我们就需要一个 JS 脚本来实现通过 Ajax 从数据库中获取数据。JS 脚本如下：
<script type="text/javascript">
/**
* setPage(url) 根据 url 从 article.php 中获取数据
* @param int pageNum 页码
* @return string
*/
var cache=new Array(); // 缓存变量，当数据被访问过之后放置在缓存中，加快访问速度
function setPage(pageNum) {
var fpage = document.getElementById('fpage'); // 获取 fpage 对象
// 如果缓存中存在数据，那么直接从缓存中读取；如果不存在数据，那么就从数据库中读取，并把数据存入缓存
if (typeof(cache[pageNum])=='undefined') {
var ajax = Ajax();
ajax.get('article.php?page='+pageNum, function(data){
fpage.innerHTML = data; // fpage对象的内容是从 article.php 中取来的
cache[pageNum] = data;
})
} else {
fpage.innerHTML = cache[pageNum];
}
}
setPage(1); // 默认执行
</script>
仔细阅读上面的代码，您会发现下面现象：
1、setPage(pageNum) 是一个从数据库中提取数据的 JS 函数接口；
2、Ajax 是通过 article.php 文件来获取数据；
3、article.php?page=xx，这里的 xx 就是所要取得的页码数据，
setPage(1)：就是取得第1页数据；
setPage(2)：就是取得第2页数据；
setPage(100)：就是取得第100页数据；
……
那么，如何从 article.php 文件中取得数据呢？请看下面代码清单。
article.php
<?php
/**
* $Id: article.php
* author Lee.
* Last modify $Date: 2012-01-21 16:53:05 $
*/
require_once './config.inc.php';
$m = new Model();
$page = new ajaxPage($m->total('article'),20); // $m->total('article') 获取 article 表的记录数；10为每页显示十条
$result = $m->fetchAll('article', '*', '', '', $page->limit); // 取出数据，^_^，很方便吧
echo '<table align="center" border="1" width="1100" style="border-collapse:collapse;font-size:14px;" bordercolor="#666">';
echo '<caption><h1 id="华强电子网资讯">华强电子网资讯</h1></caption>';
echo '<tr height="25"><th>ID</th><th>Title</th><th>Author</th><th>Source</th><th>Date</th></tr>';
foreach ($result as $v) {
echo "<tr height='21'><td align='center'>{$v['id']}</td><td>{$v['title']}</td><td align='center'>{$v['author']}</td><td align='center'>{$v['source']}</td><td align='center'>{$v['date']}</td></tr>";
}
echo '<tr><td align="right" colspan="5">'.$page->fpage().'</td></tr>';
echo '</table>';
?>
article.php 中连接的数据是前面文章从华强电子网抓来的资讯数据，因为数据比较大，代码打包下载中会附加 article.sql 文件，以便大家测试。
静态页面 index.html 上显示的数据就是 article.php 文件中 echo 的代码。
代码文件中的 config.inc.php 文件主要就是定义一些常量，比如：数据库用户名、数据库密码、主机……，数据库连接类库（Db.class.php）和数据库操作类库（Model.class.php），请参考文章 《PHP的PDO常用类库实例分析》，附有使用方法。
程序效果图：
下图标注的是注意关注的地方
这样，Ajax 无刷新分页就完成了。程序中还有一个 ajaxPage.class.php 没有说明，其实，这个 ajaxPage 类库的使用方法和一般的分页类库是一样的。
即：$page = new ajaxPage(记录总数, 每页显示数);
具体细节请大家下载代码阅读即可。
完整实例代码点击此处本站下载。
更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP+ajax技巧与应用小结》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《php操作office文档技巧总结(包括word,excel,access,ppt)》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。
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