javascript项目实战---ajax实现无刷新分页

分页：

    limit  偏移量，长度;
    limit  0,7;   第一页
    limit  7,7;   第二页
    limit  14,7;  第三页
每页信息条数：7
信息总条数：select count(*) from table
信息总页数：ceil向上取整(总条数/每页条数)

1. 分页类具体使用

<?php

class Pagination {

    private $total; //数据表中总记录数
    private $listRows; //每页显示行数
    private $limit;  //mysql 数据库的limit
    private $uri;  //分页信息前面的uri地址
    private $pageNum; //页数
    private $config = array('header' => "个记录", "prev" => "【上一页】", "next" => "【下一页】", "first" => "【首 页】", "last" => "【尾 页】");
    private $listNum = 8;

    /*
     * $total 当前信息总条数
     * $listRows 每页显示的条数
     * $pa 下面的page
       http://网址/index.php?page=5
     */

    public function __construct($total, $listRows = 10, $pa = "") {
        $this->total = $total;
        $this->listRows = $listRows;
        $this->uri = $this->getUri($pa);
        $this->page = !empty($_GET["page"]) ? $_GET["page"] : 1;//不传入page，则默认显示首页
        $this->pageNum = ceil($this->total / $this->listRows);
        $this->limit = $this->setLimit();
    }

    //设置每页显示的条数
    private function setLimit() {
        return "Limit " . ($this->page - 1) * $this->listRows . ", {$this->listRows}";
    }

    //获得URL地址
    private function getUri($pa) {
        $url = $_SERVER["REQUEST_URI"] . (strpos($_SERVER["REQUEST_URI"], '?') ? '' : "?") . $pa;

        $parse = parse_url($url);

        if (isset($parse["query"])) {
            parse_str($parse['query'], $params);
            unset($params["page"]);
            $url = $parse['path'] . '?' . http_build_query($params);
        }

        return $url;
    }

    //魔术方法，
    public function __get($args) {
        if ($args == "limit")
            return $this->limit;
        else
            return null;
    }

    //页面开始的条数
    private function start() {
        if ($this->total == 0)
            return 0;
        else
            return ($this->page - 1) * $this->listRows + 1;
    }

    //页面结束的条数
    private function end() {
        return min($this->page * $this->listRows, $this->total);
    }

    /*设置首页*/
    private function first() {
        $html = "";
        if ($this->page == 1)
            $html.='&nbsp;'.$this->config["first"].'&nbsp;';
        else
            $html.="&nbsp;<a href='javascript:void(0)' onclick='showPage(\"{$this->uri}&page=1\")'>{$this->config["first"]}</a>&nbsp;";
            //$html.="&nbsp;<a href='{$this->uri}&page=1'>{$this->config["first"]}</a>&nbsp;";

        return $html;
    }

    /*设置上一页*/
    private function prev() {
        $html = "";
        if ($this->page == 1)
            $html.='&nbsp;'.$this->config["prev"].'&nbsp;';
        else
            $html.="&nbsp;<a href='javascript:void(0)'  onclick='showPage(\"{$this->uri}&page=" . ($this->page - 1) . "\")'>{$this->config["prev"]}</a>&nbsp;";
            //$html.="&nbsp;<a href='{$this->uri}&page=".($this->page-1)."'>{$this->config["prev"]}</a>&nbsp;";

        return $html;
    }

    //页码列表【首页】【2】【3】…………【尾页】
    private function pageList() {
        $linkPage = "";

        $inum = floor($this->listNum / 2);

        for ($i = $inum; $i >= 1; $i--) {
            $page = $this->page - $i;

            if ($page < 1)
                continue;

            $linkPage.="&nbsp;<a href='javascript:void(0)' onclick='showPage(\"{$this->uri}&page={$page}\")'>{$page}</a>&nbsp;";
        }

        $linkPage.="&nbsp;{$this->page}&nbsp;";

        for ($i = 1; $i <= $inum; $i++) {
            $page = $this->page + $i;
            if ($page <= $this->pageNum)
                $linkPage.="&nbsp;<a href='javascript:void(0)' onclick='showPage(\"{$this->uri}&page={$page}\")'>{$page}</a>&nbsp;";
            else
                break;
        }

        return $linkPage;
    }

   /*设置下一页*/
    private function next() {
        $html = "";
        if ($this->page == $this->pageNum)
            $html.='&nbsp;'.$this->config["next"].'&nbsp;';
        else
            $html.="&nbsp;<a href='javascript:void(0)' onclick='showPage(\"{$this->uri}&page=" . ($this->page + 1) . "\")'>{$this->config["next"]}</a>&nbsp;";
            //$html.="&nbsp;<a href='{$this->uri}&page=".($this->page + 1)."'>{$this->config["next"]}</a>&nbsp;";

        return $html;
    }

    /*设置尾页*/
    private function last() {
        $html = "";
        if ($this->page == $this->pageNum)
            $html.='&nbsp;'.$this->config["last"].'&nbsp;';
        else
            $html.="&nbsp;<a href='javascript:void(0)' onclick='showPage(\"{$this->uri}&page=" . ($this->pageNum) . "\")'>{$this->config["last"]}</a>&nbsp;";
            //$html.="&nbsp;<a href='{$this->uri}&page=.(this->pageNum).'>{$this->config["last"]}</a>&nbsp;";

        return $html;
    }

    /*设置页面跳转*/
    private function goPage() {

        return
        '&nbsp;<input type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.value;showPage(\'' . $this->uri . '&page=\'+page+\'\')}" value="' . $this->page . '" style="width:25px">
        <input type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>' . $this->pageNum . ')?' . $this->pageNum . ':this.previousSibling.value;showPage(\'' . $this->uri . '&page=\'+page+\'\')">&nbsp;';
    }

    //页面列表配置选项
    function fpage($display = array(0, 1, 2, 3, 4, 5, 6, 7, 8)) {
        $html[0] = "&nbsp;共有<b>{$this->total}</b>{$this->config["header"]}&nbsp;";
        $html[1] = "&nbsp;每页显示<b>" . ($this->end() - $this->start() + 1) . "</b>条，本页<b>{$this->start()}-{$this->end()}</b>条&nbsp;";
        $html[2] = "&nbsp;<b>{$this->page}/{$this->pageNum}</b>页&nbsp;";

        $html[3] = $this->first();
        $html[4] = $this->prev();
        $html[5] = $this->pageList();
        $html[6] = $this->next();
        $html[7] = $this->last();
        $html[8] = $this->goPage();
        $fpage = '';
        foreach ($display as $index) {
            $fpage.=$html[$index];
        }

        return $fpage;
    }

}

2 数据显示

<?php

//链接数据库

//获得具体信息

//分页显示
header("content-type:text/html;charset=utf-8");
$link = mysql_connect('localhost','root','111111');
mysql_select_db('shop', $link);
mysql_query("set names utf8");
$css = <<<eof
<style type="text/css">
    table {border:1px solid black; width:700px; margin:auto; border-collapse:collapse;}
    td {border:1px solid black; }
</style>
eof;
echo $css;

echo "
<table>
    <tr><td>序号</td><td>名称</td><td>数量</td><td>价格</td><td>时间</td></tr>

";

//1 引入分页类
include "./Pagination.php";

//2. 获得信息总条数
$sql = "select * from sw_goods";
$qry = mysql_query($sql);
$total = mysql_num_rows($qry);
$per   = 7;

//3. 实例化分页类对象
$page_obj = new Pagination($total,$per);

//4. 拼装sql语句，获得每页信息
//利用page_obj实现limit的灵活设置
//$page_obj -> limit;
$sqla = "select * from sw_goods ".$page_obj->limit;
$qrya = mysql_query($sqla);

//5. 获得页面列表
$pagelist = $page_obj -> fpage(array(3,4,5,6,7,8));

$i=1;
while($rsta = mysql_fetch_assoc($qrya)){
    echo "<tr>";
    echo "<td>".$i++."</td>";
    echo "<td>".$rsta['goods_name']."</td>";
    echo "<td>".$rsta['goods_number']."</td>";
    echo "<td>".$rsta['goods_price']."</td>";
    echo "<td>".date("Y-m-d H:i:s",$rsta['goods_create_time'])."</td>";
    echo "</tr>";
}
echo "<tr><td colspan=5>".$pagelist."</td></tr>";
echo "</table>";

3 ajax无刷新分页实现

open(‘get’,’http://网址/index.php?page=2’)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <title>新建网页</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta name="description" content="" />
        <meta name="keywords" content="" />

        <script type="text/javascript">
//获得分页信息ajax函数
function showPage(myurl){
    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function(){
        if(xhr.readyState==4){
            var rst = document.getElementById("result");
            rst.innerHTML = xhr.responseText;
        }
    }
    xhr.open("get",myurl);
    xhr.send(null);
}
window.onload = function(){
    showPage("./data1.php");  //获得分页信息
    //showPage("./data.php?page=2");
}
        </script>

        <style type="text/css">
        </style>
    </head>

    <body>
        <h2>ajax无刷新分页效果</h2>
        <div id="result"></div>
    </body>
</html>
<script type="text/javascript">
    document.write(new Date()+"<br />");
    document.write(new Date()+"<br />");
    document.write(new Date()+"<br />");
    document.write(new Date()+"<br />");
</script>

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