asp.net+ajax简单分页实例分析

本文实例讲述了asp.net+ajax简单分页实现方法。，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.allfunction $(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);}