ajax实现 兼容ie,firefox等

转一个ＡＪＡＸ实现．

HttpXML.js：

function httpRequest(method,data,URL)
{

 var Http = null;
 try {
  Http = new ActiveXObject("Msxml2.XMLHTTP");
 }
 catch(e) {
  try {
   Http = new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch(oc) {
    Http = null;
  }
 }
 if (!Http && window.XMLHttpRequest) {
  Http = new XMLHttpRequest();
 }
 if (Http == null) {
  alert("Your browser cannot handle this script,you can try IE or Firefox.");
 }
 Http.open(method,URL,false);
 Http.send(data);
 var response = Http.responseText;
 delete(Http);
 return response;
}

function XMLDatastore()
{
 //类变量
 var xmlDoc;
 var errorInfo;
 var listOfNodes;

 //类方法
 this.init = init;
 this.createNew = createNew;
 this.loadFile = loadFile;
 this.loadXML = loadXML;
 this.rowCount = rowCount;
 this.colCount = colCount;
 this.getItem = getItem;
 this.getItemByName = getItemByName;
 this.insertRow = insertRow;
 this.addColumn = addColumn;
 this.setItem = setItem;
 this.setItemByName = setItemByName;
 this.getXML = getXML;
 this.getErrorInfo = getErrorInfo;
 this.destroy = destroy;

 function init()
 {
  // code for IE
  if (window.ActiveXObject)
  {
   xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
   xmlDoc.async=false;
  }
  // code for Mozilla, Firefox, Opera, etc.
  else if (document.implementation && document.implementation.createDocument)
  {
   xmlDoc = document.implementation.createDocument('', '', null);
   xmlDoc.async=false;
  }
  else
  {
   alert('Your browser cannot handle this script,you can try IE or Firefox.');
  }

 }

 function createNew()
 {
  root = xmlDoc.createElement("rows");
  xmlDoc.appendChild(root);
  listOfNodes = xmlDoc.documentElement.childNodes;
 }

 function loadFile(fileName)
 {
  var result = false;
  
  xmlDoc.load(fileName);
  
  root = xmlDoc.getElementsByTagName(xmlDoc.childNodes[0].tagName)[0];
  if (root.childNodes[1] == null) {
   listOfNodes = xmlDoc.documentElement.childNodes;
  }
  else {
   listOfNodes = root.getElementsByTagName(root.childNodes[1].tagName);
  }
  result = true;
  return result;
 }

 function loadXML(xml)
 {
  var result = false;
  if (navigator.appName.indexOf("Internet Explorer") == -1) {
   var parser=new DOMParser();
   xmlDoc=parser.parseFromString(xml,"text/xml");
   if (xmlDoc.documentElement) {
    result = true;
    listOfNodes = xmlDoc.documentElement.childNodes;
   }
  }
  else {
   xmlDoc.loadXML(xml);
   if(xmlDoc.parseError !=0)
   errorInfo = xmlDoc.parseError.reason;
   else
   {
    result = true;
    listOfNodes = xmlDoc.documentElement.childNodes;
   }
  }

  return result;
 }

 function rowCount()
 {
  return listOfNodes.length;
 }

 function colCount()
 {
  var cols = 0;

  if(rowCount()>0)
   cols = listOfNodes.item(0).childNodes.length;

  return cols;
 }

 function getItem(rowNo,colNo)
 {
  var node = listOfNodes.item(rowNo);
  node = node.childNodes.item(colNo);

  return node.text;
 }

 function getItemByName(rowNo,colName)
 {
  var node = listOfNodes.item(rowNo);
  var rowNodes = node.childNodes;
  var i;
  for(i=0;i<rowNodes.length;i++)
  {
   node = rowNodes.item(i);
   if(node.tagName == colName) {
    if (node.text != undefined) {
     return node.text;
    }
    else {
     return node.textContent;
    }
   }
  }

 }

 function insertRow(rowNo)
 {
  var rowElement = xmlDoc.createElement("row");

  if(rowNo == -1)
  {
   xmlDoc.documentElement.appendChild(rowElement);
   rowNo = rowCount();
  }
  else
  {
   xmlDoc.documentElement.insertBefore(rowElement,listOfNodes.item(rowNo));
  }

  return rowNo;
 }

 function addColumn(rowNo,colName,value)
 {
  var colElement = xmlDoc.createElement(colName);
  var node = listOfNodes.item(rowNo);
  node.appendChild(colElement);
  node.lastChild.text = value;
 }

 function setItem(rowNo,colNo,value)
 {
  var node = listOfNodes.item(rowNo);
  node = node.childNodes.item(colNo);

  return node.text = value;
 }

 function setItemByName(rowNo,colName,value)
 {
  var listOfCols = xmlDoc.documentElement.getElementsByTagName(colName);
  var node = listOfCols.item(rowNo);

  return node.text = value;
 }

 function getXML()
 {
  /*if (window.XSLTProcessor) {
   // transformToDocument方式
   var xsltProcessor = new XSLTProcessor();
   //xmlDoc.load("../XmlFile/Common.xsl");
   xsltProcessor.importStylesheet("../XmlFile/Common.xsl");
   var result = xsltProcessor.transformToDocument(xmlDoc);
   var xmls = new XMLSerializer();
   return xmls.serializeToString(result);
  }
  else {
   return xmlDoc.transformNode(xmlDoc);
  }*/
  var xmlstr = "<?xml version=/"1.0/" encoding=/"utf-8/"?>";
  xmlstr += "<rows>";
  for (i=0; i<listOfNodes.length; i++) {
   xmlstr += "<row>";
   rowNodes = listOfNodes.item(i).childNodes;
   for(j=0;j<rowNodes.length;j++)
   {
    node = rowNodes.item(j);
    xmlstr += "<"+node.tagName+">";
    if (node.text != undefined) {
     xmlstr += node.text;
    }
    else {
     xmlstr += node.textContent;
    }
    xmlstr += "</"+node.tagName+">";
   }
   xmlstr += "</row>";
  }
  xmlstr += "</rows>";
  return xmlstr;
 }

 function getErrorInfo()
 {
  return errorInfo;
 }

 function destroy()
 {
  delete(xmlDoc);
 }
}

使用例子1（返回简单的一个字符串）：

var url = "/include/ajax/review_vote.aspx?reviewid="+reviewid+"&votetype="+votetype+"&addtype="+addtype+"&time="+(new Date()).getTime();
    var response = httpRequest("get",null,url);

使用例子2（返回一个数据集）：程序返回一个ＸＭＬ格式的数据集

var ds = new XMLDatastore();
ds.init();
var url = "/include/ajax/common_ajax.aspx?action=getuserlocation";
var response = httpRequest("get",null,url);
if(ds.loadXML(response) == true)
{
 if (ds.rowCount() == 0) {
  searchFriend.innerHTML = "";
 }
 else {
  var IsPrimary = "";
  var Address = "";
  for(i=0;i<ds.rowCount();i++)
  {
   IsPrimary = ds.getItemByName(i,"IsPrimary");
   Address = ds.getItemByName(i,"Address");
  }
 }
}
ds.destroy();

还可以这样传参数：

var ds = new XMLDatastore();
ds.init();
ds.createNew();
ds.insertRow(-1);
ds.addColumn(0,"SortBy",SortBy.options[SortBy.selectedIndex].value);
ds.addColumn(0,"PageSize",PageSize);
ds.addColumn(0,"ListReviews",document.getElementById("MyReviewID").value);

var url = "/include/ajax/GetMyPageReview.aspx";
var response = httpRequest("post",ds.getXML(),url);