AJAX和三层架构实现分页功能

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-----------------------------HTMLPage1.htm---------------------------------


<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
table{ border:solid 1px #444; background-color:Aqua;}
table td{border:solid 1px #444;}
</style>
<script src="js/Jquery1.7.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
var pageindex = 1;
var pagesize = 10;
var lastpageindex = 1;


loaddata();


function loaddata() {
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetListAjax",
data: "{pagesize:" + pagesize + ",pageindex:" + pageindex + "}",
success: function (result) {
var strtable = '<table>';
strtable += '<tr><td>编号</td><td>标题</td><td>内容</td><td>创建时间</td></tr>';
for (var i = 0; i < result.d.length; i++) {
strtable += '<tr>';
strtable += '<td>' + result.d[i].Id + '</td>';


strtable += '<td>' + result.d[i].NewsTitle + '</td>';


strtable += '<td>' + result.d[i].NewsContent + '</td>';


strtable += '<td>' + result.d[i].CreateTime + '</td>';
strtable += '</tr>';
}
strtable += '</table>';
$('#mydiv').html(strtable);
}
})
}


$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/GetLastPageindex",
data: "{pagesize:" + pagesize + "}",
success: function (result) {
lastpageindex = result.d;
}
})


//第一页
$('a:first').click(function () {
pageindex = 1;
loaddata();
})


//上一页
$('#divfenye a:eq(1)').click(function () {
if (pageindex > 1) {
pageindex--;
loaddata();
}
})
//下一页
$('#divfenye a:eq(2)').click(function () {
if (pageindex < lastpageindex) {
pageindex++;
loaddata();
}
})
//最后一页
$('#divfenye a:eq(3)').click(function () {
pageindex = lastpageindex;
loaddata();
})
$('#divfenye a:last').click(function () {
pageindex = $('#txtPageindex').val();
loaddata();
})


$('#txtPageindex').focus(function () {
$(this).val('');
})
})
</script>
</head>
<body>
<div id="mydiv">
</div>
<div id="divfenye"><a href="#">第一页</a><a href="#">上一页</a><a href="#">下一页</a><a href="#">最后一页</a><input
id="txtPageindex" type="text" /><a href="#">Go</a></div>
</body>
</html>


-------------------------WebService1--------------------------------

// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务,请取消对下行的注释。
[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{


[WebMethod]
public string HelloWorld()
{
return "Hello World";
}


[WebMethod]
public List<Model.T_News1> GetListAjax(int pagesize,int pageindex)
{
BLL.T_News1 bnews = new BLL.T_News1();
DataTable dt = bnews.GetListDataTable(pagesize,pageindex);
List<Model.T_News1> list = new List<Model.T_News1>();


int Id;
string newstitle = "";
string newscontent = "";
DateTime createtime;
for (int i = 0; i < dt.Rows.Count; i++)
{
Id = Convert.ToInt32(dt.Rows[i]["Id"]);
newstitle = dt.Rows[i]["NewsTitle"].ToString();
newscontent = dt.Rows[i]["NewsContent"].ToString();
createtime = Convert.ToDateTime(dt.Rows[i]["CreateTime"]);


Model.T_News1 news = new Model.T_News1()
{
Id = Id,
NewsTitle = newstitle,
NewsContent = newscontent,
CreateTime = createtime
};
list.Add(news);
}
return list;
}


[WebMethod]
public int GetLastPageindex(int pagesize)
{
BLL.T_News1 bnews = new BLL.T_News1();
int totalcount = bnews.GetRecordCount("");
if (totalcount % pagesize == 0)
{
return totalcount / pagesize;
}
else
{
return totalcount / pagesize + 1;
}
}


------------------------------DAL层:--------------------------

/// <summary>
/// 分页获取数据列表
/// </summary>
public DataTable GetListDataTable(int PageSize,int PageIndex)
{
sqlParameter[] parameters = {

new sqlParameter("@PageSize",sqlDbType.Int),
new sqlParameter("@PageIndex",sqlDbType.Int)
};


parameters[0].Value = PageSize;
parameters[1].Value = PageIndex;
return DbHelpersql.RunProcedureDataTable("pro_fenye",parameters);
}


--------------------BLL层:--------------------------

public DataTable GetListDataTable(int pagesize,int pageindex)
{
return dal.GetListDataTable(pagesize,pageindex);
}


------------------DbHelpersql:-----------------------

public static DataTable RunProcedureDataTable(string storedProcName,IDataParameter[] parameters) { using (sqlConnection connection = new sqlConnection(connectionString)) { DataTable dt = new DataTable(); connection.Open(); sqlDataAdapter sqlDA = new sqlDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection,storedProcName,parameters); sqlDA.Fill(dt); connection.Close(); return dt; } }

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