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基于Jquery+Ajax+Json的高效分页实现代码

高洛峰
高洛峰asal
2017-01-12 10:09:15903semak imbas

正文 
首先我们创建一般处理程序，来读取数据库中内容，得到返回值. 
创建文件，GetData.ashx. 
我这里是用的存储过程，存储过程会再下面粘出来，至于数据只是实例，你们可根据需求自行读取数据 
代码如下： 

<%@ WebHandler Language="C#" Class="GetData" %> 
using System; 
using System.Web; 
using System.Data.SqlClient; 
using System.Data; 
using System.Collections.Generic; 
using System.Web.Script.Serialization; 
public class GetData : IHttpHandler { 
public void ProcessRequest (HttpContext context) { 
context.Response.ContentType = "text/plain"; 
var pageIndex = context.Request["PageIndex"]; 
string connectionString = @"Data Source=KUSE\SQLEXPRESS;Initial Catalog=bookshop;Integrated Security=True"; 
//判断当前索引存不存在，如果不存在则获取记录的总数。 
if (string.IsNullOrEmpty(pageIndex)) 
{ 
//获取查询记录总数的sql语句 
string sql = "select count(-1) from books"; 
int count = 0; 
int.TryParse(SqlHelper.ExecuteScalar(connectionString, System.Data.CommandType.Text, sql, null).ToString(), out count); 
context.Response.Write(count); 
context.Response.End(); 
} 
//当根据索引获取数据 
else 
{ 
int currentPageIndex = 1; 
int.TryParse(pageIndex, out currentPageIndex); 
SqlParameter[] parms = new SqlParameter[] { 
new SqlParameter("@FEILDS",SqlDbType.NVarChar,1000), 
new SqlParameter("@PAGE_INDEX",SqlDbType.Int,10), 
new SqlParameter("@PAGE_SIZE",SqlDbType.Int,10), 
new SqlParameter("@ORDERTYPE",SqlDbType.Int,2), 
new SqlParameter("@ANDWHERE",SqlDbType.VarChar,1000), 
new SqlParameter("@ORDERFEILD",SqlDbType.VarChar,100) 
}; 
parms[0].Value = "*";//获取所有的字段 
parms[1].Value = pageIndex;//当前页面索引 
parms[2].Value = 10;//页面大小 
parms[3].Value = 0;//升序排列 
parms[4].Value = "";//条件语句 
parms[5].Value = "ID";//排序字段 
List<Book> list = new List<Book>(); 
using (SqlDataReader sdr = SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, "PAGINATION", parms)) 
{ 
while (sdr.Read()) 
{ 
list.Add(new Book { Title = sdr[2].ToString(), Auhor = sdr[2].ToString(), PublishDate = sdr[4].ToString(), ISBN = sdr[5].ToString() }); 
} 
} 
context.Response.Write(new JavaScriptSerializer().Serialize(list).ToString());//转为Json格式 
} 
} 
public bool IsReusable { 
get { 
return false; 
} 
} 
} 
public class Book 
{ 
public string Title { get; set; } 
public string Auhor { get; set; } 
public string PublishDate { get; set; } 
public string ISBN { get; set; } 
}

显示数据页面----异步请求获取数据，基于jquery 
创建页面Show.htm 

<body> 
<div > 
<table id="content">/*显示数据内容*/ 
</table> 
<div id="pager" class="yahoo2"></div>/*显示分页条*/ 
</div> 
</body>

js代码 

$(function () { 
$.post("GetData.ashx", null, function (data) { 
var total = data; 
PageClick(1, total, 3); 
}); 
PageClick = function (pageIndex, total, spanInterval) { 
$.ajax({ 
url: "GetData.ashx", 
data: { "PageIndex": pageIndex }, 
type: "post", 
dataType: "json", 
success: function (data) { 
//索引从1开始 
//将当前页索引转为int类型 
var intPageIndex = parseInt(pageIndex); 
//获取显示数据的表格 
var table = $("#content"); 
//清楚表格中内容 
$("#content tr").remove(); 
//向表格中添加内容 
for (var i = 0; i < data.length; i++) { 
table.append( 
$("<tr><td>" + 
data[i].Title 
+ "</td><td>" + 
data[i].Auhor 
+ "</td><td>" + 
data[i].PublishDate 
+ "</td><td>" + 
data[i].ISBN 
+ "</td></tr>") 
); 
} //for 
//创建分页 
//将总记录数结果 得到 总页码数 
var pageS = total 
if (pageS % 10 == 0) pageS = pageS / 10; 
else pageS = parseInt(total / 10) + 1; 
var $pager = $("#pager"); 
//清楚分页div中的内容 
$("#pager span").remove(); 
$("#pager a").remove(); 
//添加第一页 
if (intPageIndex == 1) 
$pager.append("<span class=&#39;disabled&#39;>第一页</span>"); 
else { 
var first = $("<a href=&#39;javascript:void(0)&#39; first=&#39;" + 1 + "&#39;>第一页</a>").click(function () { 
PageClick($(this).attr(&#39;first&#39;), total, spanInterval); 
return false; 
}); 
$pager.append(first); 
} 
//添加上一页 
if (intPageIndex == 1) 
$pager.append("<span class=&#39;disabled&#39;>上一页</span>"); 
else { 
var pre = $("<a href=&#39;javascript:void(0)&#39; pre=&#39;" + (intPageIndex - 1) + "&#39;>上一页</a>").click(function () { 
PageClick($(this).attr(&#39;pre&#39;), total, spanInterval); 
return false; 
}); 
$pager.append(pre); 
} 
//设置分页的格式 这里可以根据需求完成自己想要的结果 
var interval = parseInt(spanInterval); //设置间隔 
var start = Math.max(1, intPageIndex - interval); //设置起始页 
var end = Math.min(intPageIndex + interval, pageS)//设置末页 
if (intPageIndex < interval + 1) { 
end = (2 * interval + 1) > pageS ? pageS : (2 * interval + 1); 
} 
if ((intPageIndex + interval) > pageS) { 
start = (pageS - 2 * interval) < 1 ? 1 : (pageS - 2 * interval); 
} 
//生成页码 
for (var j = start; j < end + 1; j++) { 
if (j == intPageIndex) { 
var spanSelectd = $("<span class=&#39;current&#39;>" + j + "</span>"); 
$pager.append(spanSelectd); 
} //if 
else { 
var a = $("<a href=&#39;javascript:void(0)&#39;>" + j + "</a>").click(function () { 
PageClick($(this).text(), total, spanInterval); 
return false; 
}); 
$pager.append(a); 
} //else 
} //for 
//上一页 
if (intPageIndex == total) { 
$pager.append("<span class=&#39;disabled&#39;>下一页</span>"); 
} 
else { 
var next = $("<a href=&#39;javascript:void(0)&#39; next=&#39;" + (intPageIndex + 1) + "&#39;>下一页</a>").click(function () { 
PageClick($(this).attr("next"), total, spanInterval); 
return false; 
}); 
$pager.append(next); 
} 
//最后一页 
if (intPageIndex == pageS) { 
$pager.append("<span class=&#39;disabled&#39;>最后一页</span>"); 
} 
else { 
var last = $("<a href=&#39;javascript:void(0)&#39; last=&#39;" + pageS + "&#39;>最后一页</a>").click(function () { 
PageClick($(this).attr("last"), total, spanInterval); 
return false; 
}); 
$pager.append(last); 
} 
} //sucess 
}); //ajax 
}; //function 
}); //ready

分页样式----如果有感兴趣的，我这里还有20几套分页样式

<style type="text/css"> 
DIV.yahoo2 { 
PADDING-RIGHT: 3px; PADDING-LEFT: 3px; FONT-SIZE: 0.85em; PADDING-BOTTOM: 3px; MARGIN: 3px; PADDING-TOP: 3px; FONT-FAMILY: Tahoma,Helvetica,sans-serif; TEXT-ALIGN: center 
} 
DIV.yahoo2 A { 
BORDER-RIGHT: #ccdbe4 1px solid; PADDING-RIGHT: 8px; BACKGROUND-POSITION: 50% bottom; BORDER-TOP: #ccdbe4 1px solid; PADDING-LEFT: 8px; PADDING-BOTTOM: 2px; BORDER-LEFT: #ccdbe4 1px solid; COLOR: #0061de; MARGIN-RIGHT: 3px; PADDING-TOP: 2px; BORDER-BOTTOM: #ccdbe4 1px solid; TEXT-DECORATION: none 
} 
DIV.yahoo2 A:hover { 
BORDER-RIGHT: #2b55af 1px solid; BORDER-TOP: #2b55af 1px solid; BACKGROUND-IMAGE: none; BORDER-LEFT: #2b55af 1px solid; COLOR: #fff; BORDER-BOTTOM: #2b55af 1px solid; BACKGROUND-COLOR: #3666d4 
} 
DIV.yahoo2 A:active { 
BORDER-RIGHT: #2b55af 1px solid; BORDER-TOP: #2b55af 1px solid; BACKGROUND-IMAGE: none; BORDER-LEFT: #2b55af 1px solid; COLOR: #fff; BORDER-BOTTOM: #2b55af 1px solid; BACKGROUND-COLOR: #3666d4 
} 
DIV.yahoo2 SPAN.current { 
PADDING-RIGHT: 6px; PADDING-LEFT: 6px; FONT-WEIGHT: bold; PADDING-BOTTOM: 2px; COLOR: #000; MARGIN-RIGHT: 3px; PADDING-TOP: 2px 
} 
DIV.yahoo2 SPAN.disabled { 
DISPLAY: none 
} 
DIV.yahoo2 A.next { 
BORDER-RIGHT: #ccdbe4 2px solid; BORDER-TOP: #ccdbe4 2px solid; MARGIN: 0px 0px 0px 10px; BORDER-LEFT: #ccdbe4 2px solid; BORDER-BOTTOM: #ccdbe4 2px solid 
} 
DIV.yahoo2 A.next:hover { 
BORDER-RIGHT: #2b55af 2px solid; BORDER-TOP: #2b55af 2px solid; BORDER-LEFT: #2b55af 2px solid; BORDER-BOTTOM: #2b55af 2px solid 
} 
DIV.yahoo2 A.prev { 
BORDER-RIGHT: #ccdbe4 2px solid; BORDER-TOP: #ccdbe4 2px solid; MARGIN: 0px 10px 0px 0px; BORDER-LEFT: #ccdbe4 2px solid; BORDER-BOTTOM: #ccdbe4 2px solid 
} 
DIV.yahoo2 A.prev:hover { 
BORDER-RIGHT: #2b55af 2px solid; BORDER-TOP: #2b55af 2px solid; BORDER-LEFT: #2b55af 2px solid; BORDER-BOTTOM: #2b55af 2px solid 
} 
</style>

　分页存储过程---PAGINATION 

CREATE PROCEDURE [dbo].[PAGINATION] 
@FEILDS VARCHAR(1000),--要显示的字段 
@PAGE_INDEX INT,--当前页码 
@PAGE_SIZE INT,--页面大小 
@ORDERTYPE BIT,--当为0时 则为 desc 当为1 时 asc 
@ANDWHERE VARCHAR(1000)=&#39;&#39;,--where语句 不用加where 
@ORDERFEILD VARCHAR(100) --排序的字段 
as 
DECLARE @EXECSQL VARCHAR(2000) 
DECLARE @ORDERSTR VARCHAR(100) 
DECLARE @ORDERBY VARCHAR(100) 
BEGIN 
set NOCOUNT on 
IF @ORDERTYPE = 1 
BEGIN 
SET @ORDERSTR = &#39; > ( SELECT MAX([&#39;+@ORDERFEILD+&#39;])&#39; 
SET @ORDERBY = &#39;ORDER BY &#39;+@ORDERFEILD+&#39; ASC&#39; 
END 
ELSE 
BEGIN 
SET @ORDERSTR = &#39; < ( SELECT MIN([&#39;+@ORDERFEILD+&#39;])&#39; 
SET @ORDERBY = &#39;ORDER BY &#39;+@ORDERFEILD+&#39; DESC&#39; 
END 
IF @PAGE_INDEX = 1 --当页码是第一页时直接运行，提高速度 
BEGIN 
IF @ANDWHERE=&#39;&#39; 
SET @EXECSQL = &#39;SELECT TOP &#39;+STR(@PAGE_SIZE)+&#39; &#39;+@FEILDS+&#39; FROM [books] &#39;+@ORDERBY 
ELSE 
SET @EXECSQL = &#39;SELECT TOP &#39;+STR(@PAGE_SIZE)+&#39; &#39;+@FEILDS+&#39; FROM [books] WHERE &#39;+@ANDWHERE+&#39; &#39;+ @ORDERBY 
END 
ELSE 
BEGIN 
IF @ANDWHERE=&#39;&#39; 
BEGIN --以子查询结果当做新表时 要给表名别名才能用 
SET @EXECSQL = &#39;SELECT TOP&#39;+STR(@PAGE_SIZE)+&#39; &#39;+@FEILDS+&#39; FROM [books] WHERE &#39;+@ORDERFEILD+ 
@ORDERSTR+&#39; FROM (SELECT TOP &#39;+STR(@PAGE_SIZE*(@PAGE_INDEX-1))+&#39; &#39;+@ORDERFEILD+ 
&#39; FROM [books] &#39;+@ORDERBY+&#39;) AS TEMP) &#39;+ @ORDERBY 
END 
ELSE 
BEGIN 
SET @EXECSQL = &#39;SELECT TOP&#39;+STR(@PAGE_SIZE)+&#39; &#39;+@FEILDS+&#39; FROM [books] WHERE &#39;+@ORDERFEILD+ 
@ORDERSTR+&#39; FROM (SELECT TOP &#39;+ STR(@PAGE_SIZE*(@PAGE_INDEX-1))+&#39; &#39;+@ORDERFEILD+ 
&#39; FROM [books] WHERE &#39;+@ANDWHERE+&#39; &#39;+@ORDERBY+&#39;) AS TEMP) AND &#39;+@ANDWHERE+&#39; &#39;+ @ORDERBY 
END 
END 
EXEC (@EXECSQL)--这里要加括号 
END

PageClick(1, total, 3); 这个函数，第一个参数是当前页码，第一调用为第一页，这个不用管，total：表示总记录数,第三个参数表示：当前索引和旁边个间隔几页

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