asp.net点击 查看更多 实现无刷新加载的实现代码

<script type="text/javascript">

$(function () {

function init(count, start) {

$.ajax({

type: "GET",

dataType: "json",

url: "Handler/Handler.ashx",

data: { action: "GetMoreNews", count: count, start: start },

beforeSend: function () { $("#divload").show(); $("#more2").hide(); },

complete: function () { $("#divload").hide(); $("#more2").show(); },

success: function (json) {

var str = "";

$.each(json, function (index, array) {

var str = "<div class='single_item'>"

+ "<div class='element_head'>"

+ "<div class='author'>" + array['Title'] +"</div>"

+ "<div class='date'>" + array['Date'] + "</div>"

+ "</div>"

+ "<div class='content'>" + array['Contents'] + "</div>"

+ "</div>";

$("#more").append(str);

});

if (json == "") {

$("#more2").html("没有更多内容加载了……");

}

}

});

}

var count = 5;

var start = 0;

init(count, start);

$(".get_more").click(function () {

start += 5;

init(count, start);

});

});

</script>

页面页面的js代码如下，

<b> <script type="text/javascript">

$(function () {

function init(count, start) {

$.ajax({

type: "GET",

dataType: "json",

url: "Handler/Handler.ashx",

data: { action: "GetMoreNews", count: count, start: start },

beforeSend: function () { $("#divload").show(); $("#more2").hide(); },

complete: function () { $("#divload").hide(); $("#more2").show(); },

success: function (json) {

var str = "";

$.each(json, function (index, array) {

var str = "<div class='single_item'>"

+ "<div class='element_head'>"

+ "<div class='author'>" + array['Title'] +"</div>"

+ "<div class='date'>" + array['Date'] + "</div>"

+ "</div>"

+ "<div class='content'>" + array['Contents'] + "</div>"

+ "</div>";

$("#more").append(str);

});

if (json == "") {

$("#more2").html("没有更多内容加载了……");

}

}

});

}

var count = 5;

var start = 0;

init(count, start);

$(".get_more").click(function () {

start += 5;

init(count, start);

});

});

</script></b>

解释上面js的大体意思：定义一个init方法，此方法带有两个参数count和start，count意思是每次加载显示评论数，start意思是，每次从数据库中读取的位置，比如0，5,10。

Handler.ashx处理页面的代码如下

case "GetMoreNews":

int count = int.Parse(context.Request.QueryString["count"].ToString());

int start = int.Parse(context.Request.QueryString["start"].ToString());

IList<WineNews> morenews = WineNewsManager.WineNewsQueryFromMToN(count,start);

Content = JavaScriptConvert.SerializeObject(morenews);

break;

public static IList<WineNews> WineNewsQueryFromMToN(int count,int start)

{

using (SqlConnection cn = new SqlConnection(SQLHelp.Conn))

{

cn.Open();

string sql = "SELECT TOP " + count + " f.* FROM tb_WineNews f WHERE Id NOT IN (SELECT TOP " + start + " Id FROM tb_WineNews ORDER BY Id desc) ORDER BY Id desc";

SqlCommand cmd = new SqlCommand(sql, cn);

SqlDataReader dr = cmd.ExecuteReader();

IList<WineNews> list = new List<WineNews>();

while (dr.Read())

{

WineNews wineNews = new WineNews();

if (dr["ID"] != DBNull.Value)

{

wineNews.ID = (int)dr["ID"];

}

if (dr["Title"] != DBNull.Value)

{

wineNews.Title = (string)dr["Title"];

}

if (dr["Contents"] != DBNull.Value)

{

wineNews.Contents = (string)dr["Contents"];

}

if (dr["Picture"] != DBNull.Value)

{

wineNews.Picture = (string)dr["Picture"];

}

if (dr["Date"] != DBNull.Value)

{

wineNews.Date = ((DateTime)dr["Date"]).ToString("yyyy-MM-dd HH:mm:ss");

}

list.Add(wineNews);

}

dr.Close();

return list;

}

}