asp.net+ajax简单分页 asp.net+ajax简单分页实例分析
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本文实例讲述了asp.net+ajax简单分页实现方法。分享给大家供大家参考，具体如下：
这里涉及两个.aspx文件，一个叫Default.aspx,一个叫AjaxOperations.aspx,第一个用来显示一些测试数据，后一个用来对分页进行处理。js文件夹下面还有一个testJs.js的文件，它就是ajax操作的核心部分。不错，code is cheap。看代码：
/*testJs.js*/
// 此函数等价于document.getElementById /document.all
function $(s) { if (document.getElementById) { return eval('document.getElementById("' + s + '")'); } else { return eval('document.all.' + s); } }
// 创建 XMLHttpRequest对象，以发送ajax请求
function createXMLHTTP() {
var xmlHttp = false;
var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
"MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
"Microsoft.XMLHTTP"];
for (var i = 0; i < arrSignatures.length; i++) {
try {
xmlHttp = new ActiveXObject(arrSignatures[i]);
return xmlHttp;
}
catch (oError) {
xmlHttp = false; //ignore
}
}
// throw new Error("MSXML is not installed on your system.");
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
xmlHttp = new XMLHttpRequest();
}
return xmlHttp;
}
//window.onload = showPages(1, 10, 100);
//cP目前页码, tP总页数 ,tN总记录数
function showPages(cP, tP, tN) {
//处理页码大于总页数
if (cP >= tP) {
cP = tP;
}
//处理页码小于1
if (cP < 1) {
cP = 1;
}
var trPg = $("trPager");
var newCellOne = trPg.insertCell(0);
newCellOne.width = "20%";
var newCellTwo = trPg.insertCell(1);
newCellTwo.width = "15%";
newCellTwo.id = "pgSummary";
var newCellThree = trPg.insertCell(2);
newCellThree.width = "45%";
newCellThree.id = "pgNumContext";
var newCellFour = trPg.insertCell(3)
newCellFour.width = "20%";
newCellTwo.innerHTML = "共<span id='totalNum'>" + tN + "</span>项 第<span id='cuPgNumber' style='color:red'>" + cP + "</span>/<span id='sumPgNumber' >" + tP + "</span>页";
var pageHtml = " <a href='#' onclick='gotoPage(1)'>首页</a>";
pageHtml += "<a id='prevPg' href='#' onclick='goToNextPrev(-1)'> 上页 </a>";
for (var i = 1; i < tP + 1; i++) {
var numColor = "";
if (i == 1) numColor = "red";
pageHtml += "<a id='numPg" + i + "' style='color:" + numColor + "' href='#' onclick='gotoPage(" + i + ")'>" + i + " </a>";
}
pageHtml += "<a id='nextPg' href='#' onclick='goToNextPrev(1)'> 下页</a>";
pageHtml += "<a href='#' onclick='gotoPage(" + tP + ")'> 尾页</a>";
pageHtml += " <input name='pgNumber' type='text' id='pgNumber' size='3' onKeyPress='return handleEnterOnPgNumber();'> " +
"<input name='goto' type='button' id='goto' value='go' onClick='forward()'>";
newCellThree.innerHTML = pageHtml;
}
//构造页面跳转的js函数，函数中需要判断输入的页号是否是合法的数值
function forward() {
if (!(/^([-]){0,1}([0-9]){1,}$/.test($("pgNumber").value))) {
//输入的值不合法
alert("请输入合法的页号！");
$("pgNumber").focus();
$("pgNumber").select();
}
else
gotoPage($("pgNumber").value);
}
//处理在跳转页面上按下回车的情况
function handleEnterOnPgNumber() {
if (event.keyCode == 13) {
forward();
return false;
}
return true;
}
function gotoPage(oNum) { // 页数不能为0或者为负数 (首页，尾页)
if (oNum > 0) {
var totalNumber = parseInt($("totalNum").innerText); //总记录数
var curPgNumber = parseInt($("cuPgNumber").innerText);
var totalPgNumber = parseInt($("sumPgNumber").innerText); // 总页数
if (parseInt(oNum) <= totalPgNumber) {
chgPages(oNum, totalPgNumber, totalNumber);
for (var k = 1; k < totalPgNumber + 1; k++) {
$("numPg" + k).style.color = "";
}
$("numPg" + oNum).style.color = "red";
getPagerInfo(oNum);
}
else {
alert("请输入合法的页号！");
$("pgNumber").focus();
$("pgNumber").select();
return;
}
}
}
function goToNextPrev(oNum) {
var addNum = parseInt(oNum);
var totalNumber = parseInt($("totalNum").innerText); //总记录数
var curPgNumber = parseInt($("cuPgNumber").innerText);
var totalPgNumber = parseInt($("sumPgNumber").innerText); // 总页数
//如果当前页是第一页，点击前一页不用刷新 //如果当前页是最后一页，点击下一页不用刷新
if ((curPgNumber + addNum) > 0 && (curPgNumber + addNum) <= totalPgNumber) {
chgPages(parseInt(curPgNumber + addNum), totalPgNumber, totalNumber);
for (var k = 1; k < totalPgNumber + 1; k++) {
$("numPg" + k).style.color = "";
}
$("numPg" + parseInt(curPgNumber + addNum)).style.color = "red";
getPagerInfo(parseInt(curPgNumber + addNum));
}
}
function chgPages(cuPg, toPg, tNum) {
// $("totalNum").innerHTML = tNum;
$("cuPgNumber").innerHTML = cuPg;
//$("sumPgNumber").innerHTML = toPg;
}
function getPagerInfo(oNum) { // 处理请求，更新内容
var xmlReq = createXMLHTTP();
xmlReq.open("post", "/AjaxOperations.aspx?pgNumber=" + oNum, true);
xmlReq.onreadystatechange = function() {
if (xmlReq.readyState == 4) {
if (xmlReq.status == 200) {
//xmlReq.responseText为输出的那段字符串
$("tbTest").innerHTML = xmlReq.responseText;
}
else {
$("tbTest").innerHTML = " 获取数据中，请稍等．．．";
//alert("Connect the server failed!");
}
}
}
xmlReq.send(null);
}
Default.aspx：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebTest2008.Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script src="js/testJs.js" type="text/javascript"></script>
<style type="text/css">
A:link
{
color: #003399;
text-decoration: none;
}
A:visited
{
color: #003366;
text-decoration: none;
}
A:hover
{
color: #ff0000;
text-decoration: underline;
}
A:active
{
color: #00ff00;
text-decoration: none;
}
</style>
<title></title>
</head>
<body onload="showPages(1, 10, 100)">
<form id="form1" runat="server">
<div>
<div style="text-align: center" id="tbTest">
第1页</div>
<table cellspacing="0" style="width: 100%; height: 30px" border="0" align="center">
<tr id="trPager">
</tr>
</table>
</div>
</form>
</body>
</html>
Default.aspx.cs：
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebTest2008
{
public partial class Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
}
}
AjaxOperations.aspx：
复制代码 代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AjaxOperations.aspx.cs" Inherits="WebTest2008.AjaxOperations" %>
AjaxOperations.aspx.cs：
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebTest2008
{
public partial class AjaxOperations : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(Request["pgNumber"]))
{
//int pgNum = Convert.ToInt32(Request["pgNumber"]);
Response.Write("第" + Request["pgNumber"] + "页");
}
}
}
}
Ok了，在我的机器上（vs2008）测试通过，简单的ajax分页效果就实现了。
希望本文所述对大家ajax程序设计有所帮助。
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