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./TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www./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', act);
req.setRequestHeader('Content-Type',
'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(/\n/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>
