用js实现ajax无刷新修改图片标题和描述

以下为引用的内容：

用js实现ajax无刷新修改图片标题和描述的前台代码；

一个html文件，内容如下：

<!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>
<Meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>ajax修改</title>
<script language="javascript">
// IE support
if (window.ActiveXObject && !window.XMLHttpRequest) {
window.XMLHttpRequest=function() {
return new ActiveXObject((navigator.userAgent.toLowerCase().indexOf('msie 5') != -1) ? 'Microsoft.XMLHTTP' : 'Msxml2.XMLHTTP');
};
}

//修改描述
function update(photoID,descvalue) {
var req=new XMLHttpRequest();
if (req) {
     req.onreadystatechange=function(){
        if (req.readyState==4 && req.status==200) {
           if (req.responseText!="") alert(req.responseText);

        }
}
}
    var act= document.getElementById("path").value+"/AjaxCtrl";
    req.open('POST',act);
    req.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
req.send("page=UpdatePhotoDescPage&photoID="+photo_id+"&desc="+descvalue);
}

function initDesc(photoID){
var desc=document.getElementById("txto");
desc.onclick="";
desc.onmouSEOver="";
var str = document.getElementById('hid').value;
if(str=="点击添加照片描述") str="";
desc.innerHTML="<textarea id='txt' class='highlight' style='margin-top: 0px; font-size: 14px; margin-bottom: 0px; width: 820px' rows='5'>"+str.replace(/<br>/g,'')+"</textarea><br><input type='button' value='保存' onclick='getvalue("+photoID+");' />  <input type='button' value='取消' onclick='resetDescHTML("+photoID+");' />";
}

function getvalue(photoID){
desctxt=document.getElementById("txt");
var desc=document.getElementById("txto");
var descvalue=desctxt.value.replace(/(^s*)|(s*$)/g,'');
var str=descvalue;
if(str.length > 2000){
  alert("描述字数最多只能是2000个汉字！请重新输入。");
  return;
}
desc.innerHTML="正在保存中。。。。。。";
if(str==''){
  update(photoID,'');
  document.getElementById('hid').value='';
  desc.innerHTML="<div id='sp' onclick='initDesc("+photoID+");' style='width: 320px' onmouSEOver='ch(this);' onmouSEOut='res(this);'><i style='color: #888; width: 240px'>点击添加图片描述</i></div>";
} else {
  update(photoID,str);
  document.getElementById('hid').value = descvalue;
  desc.innerHTML="<div id='sp' onclick='initDesc("+photoID+");' style='width: 320px; word-wrap: break-word;' onmouSEOver='ch(this);' onmouSEOut='res(this);'>"+filtertxtd(document.getElementById('hid').value)+"</div>";
}
}

function resetDescHTML(photoID){
var desc=document.getElementById("txto");
if(document.getElementById('hid').value=='' || document.getElementById('hid').value=='点击添加照片描述'){
desc.innerHTML="<div id='sp' onclick='initDesc("+photoID+");' style='width: 320px' onmouSEOver='ch(this);' onmouSEOut='res(this);'><i style='color: #888; width: 320px' onmouSEOver='res(this);' onmouSEOut='ch(this);'>点击添加照片描述<i></div>";
} else {
desc.innerHTML="<div id='sp' onclick='initDesc("+photoID+");' style='margin-top: 0px; font-size: 14px; margin-bottom: 0px; width: 320px; word-wrap: break-word;' onmouSEOver='ch(this);' onmouSEOut='res(this);'>"+filtertxtd(document.getElementById('hid').value)+"</div>";
}
}

//修改标题
function updateTit(photoID,titvalue) {
var req=new XMLHttpRequest();
if (req) {
    req.onreadystatechange=function(){
   if (req.readyState==4 && req.status==200) {
      if (req.responseText!="") alert(req.responseText);

   }
  }
}
    var act= document.getElementById("path").value+"/AjaxCtrl";
    req.open('POST','application/x-www-form-urlencoded');
req.send("page=UpdatePhotoTitlePage&photoID="+photo_id+"&title="+titvalue);
}

function initTit(photoID) {
var tit=document.getElementById("tit");
tit.onclick="";
tit.onmouSEOver="";
var str = document.getElementById('hidTit').value;
if(str=="点击添加照片名称") str="";
tit.innerHTML="<input type='text' id='txtTit' class='highlight' style='margin-top: 0px; font-size: 14px; margin-bottom: 0px; width: 320px' value='"
+ str + "'maxlength='50' /><br><input type='button' value='保存' onclick='getTit("+photoID+");' />  <input type='button' value='取消' onclick='resetTitHTML("+photoID+");' />";
}

function getTit(photoID) {
var txtTit=document.getElementById("txtTit");
var tit=document.getElementById("tit");
var titvalue=txtTit.value.replace(/(^s*)|(s*$)/g,'');
tit.innerHTML="正在保存中。。。。。。";
if(titvalue==''){
  updateTit(photoID,'');
  document.getElementById("hidTit").value='';
  tit.innerHTML="<div id='sp' onclick='initTit("+photoID+");' style='width: 320px' onmouSEOver='ch(this);' onmouSEOut='res(this);'><i style='color: #888'>点击添加照片名称</i></div>";
} else {
  updateTit(photoID,titvalue);
  document.getElementById("hidTit"+idx).value=filtertxtd(titvalue);
  tit.innerHTML="<div id='sp' onclick='initTit("+photoID+");' style='width: 320px' onmouSEOver='ch(this);' onmouSEOut='res(this);'><h4 id='title_div44177575' style='margin-top: 0px; font-size: 14px; margin-bottom: 0px; width: 320px'>"+document.getElementById("hidTit").value+"</h4></div>";
}
}

function resetTitHTML(photoID) {
var tit=document.getElementById("tit");
if(document.getElementById('hidTit').value=='' || document.getElementById('hidTit').value=='点击添加照片名称') {
  tit.innerHTML="<i style='color: #888' onclick='initTit("+photoID+");' onmouSEOver='ch(this);' onmouSEOut='res(this);'>点击添加照片名称</i>";
  tit.onmouSEOver="ch(this);";
} else {
  tit.innerHTML="<div id='sp' onclick='initTit("+photoID+");' onmouSEOver='ch(this);' onmouSEOut='res(this);' style='width: 320px; word-wrap: break-word;'><h4 id='title_div44177575' style='margin-top: 0px; font-size: 14px; margin-bottom: 0px; width: 320px'>"+filtertxtd(document.getElementById('hidTit').value)+"</h4></div>";
}
}

function ch(activeX){
activeX.style.background="#ffc";
}

function res(activeX){
activeX.style.background="#fff";
}

function filtertxtd(str){
var filterStr=str.replace(/(^s*)|(s*$)/g,'').replace(/</g,"<").replace(/>/g,">").replace(//g,"<br>");
return filterStr;
}
</script>
</head>

<body>
<input type="hidden" id="hidTit" value="点击添加照片名称" />
     <div title="点击修改照片名称" id="tit" onclick="initTit('1');" onmouSEOver="ch(this);" onmouSEOut="res(this);" style="width: 320px; word-wrap: break-word;">
     <i style="color: #888;">点击添加照片名称</i>
     </div>
<br/>
   <div><div title="点击修改照片描述" id="txto" style="width: 820px; word-wrap: break-word;" onclick="initDesc('1');" onmouSEOver="ch(this);" onmouSEOut="res(this);"><i style="color: #888;">点击添加照片描述"</i></div>
  </div>
  <input type="hidden" id="hid" value="点击添加照片描述" />
   </div>
</div>
</body>
</html>

用js实现ajax无刷新修改图片标题和描述

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