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 = $("trPager"); var newCellOne = trPg.insertCell(0); newCellOne.width = "20%"; var newCellTwo = trPg.insertCell(1); newCellTwo.width = "15%"; newCellTwo.id = "pgSummary"; var newCellThree = trPg.insertCell(2); newCellThree.width = "45%"; newCellThree.id = "pgNumContext"; var newCellFour = trPg.insertCell(3) newCellFour.width = "20%"; newCellTwo.innerHTML = "共<span>" + tN + "</span>项 第<span>" + cP + "</span>/<span >" + tP + "</span>页"; var pageHtml = " <a href='#'>首页</a>"; pageHtml += "<a href='#'> 上页 </a>"; for (var i = 1; i < tP + 1; i++) { var numColor = ""; if (i == 1) numColor = "red"; pageHtml += "<a href='#'>" + i + " </a>"; } pageHtml += "<a href='#'> 下页</a>"; pageHtml += "<a href='#'> 尾页</a>"; pageHtml += " <input type='text' size='3' onKeyPress='return handleEnterOnPgNumber();'> " + "<input type='button' value='go'>"; newCellThree.innerHTML = pageHtml; } //构造页面跳转的js函数，函数中需要判断输入的页号是否是合法的数值 function forward() { if (!(/^([-]){0,1}([0-9]){1,}$/.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：