php+ajax实现文章自动保存的方法

); var is_opera = (userAgent.indexOf('opera') != -1); var is_saf = ((userAgent.indexOf('applewebkit') != -1) || (navigator.vendor == 'Apple Computer,Inc.')); var is_webtv = (userAgent.indexOf('webtv') != -1); var is_ie = ((userAgent.indexOf('msie') != -1) && (!is_opera) && (!is_saf) && (!is_webtv)); var is_ie4 = ((is_iE) && (userAgent.indexOf('msie 4.') != -1)); var is_moz = ((navigator.product == 'Gecko') && (!is_saf)); var is_kon = (userAgent.indexOf('konqueror') != -1); var is_ns = ((userAgent.indexOf('compatible') == -1) && (userAgent.indexOf('mozilla') != -1) && (!is_opera) && (!is_webtv) && (!is_saf)); var is_ns4 = ((is_ns) && (parseInt(navigator.appVersion) == 4)); var is_mac = (userAgent.indexOf('mac') != -1); if ((is_ie & !is_ie4) || is_moz || is_saf || is_opera) { var allowajax=1; }else{ var allowajax=0; } var xmlhttp = false; function makeSendData(postData,url,functionName,httptypE) {

var posturl=url;
try {
xmlhttp = new ActiveXObject("Msxml2.XMLhttp");
} catch (E) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLhttp");
} catch (e2) {
xmlhttp = false;
}
}
if (!xmlhttp && typeof XMLhttprequest != 'undefined') {
xmlhttp = new XMLhttprequest();
}

if (!xmlhttp) {
alert('CAnnot send an XMLhttp request');
return false;
}

// 提交表单的方式
xmlhttp.open(httptype,posturl,truE);

// 当表单提交完成后触发一个事件
var changefunc="xmlhttp.onreadystatechange = "+functionName; ///////from bob
eval (changefunc);
xmlhttp.setrequestHeader('Content-Type','application/x-www-form-urlencoded');
xmlhttp.send(postData);
}
function autosave_post()
{
var title=document.getElementById('title').value;
var content = window.frames["Editor"].window.frames["HtmlEditor"].document.getElementsByTagName("BODY")[0].innerHTML;
var postTime=document.getElementById('postTime').value;
if(allowajax==1)
{
content=postencode(content);
title=postencode(titlE);
var post="title="+title+"&content="+content+"&postTime="+postTime+"";
var url="ajax.php?act=autosave";
makeSendData(post,'autosave','POST');
}
}
function autosave()
{
if(xmlhttp.readyState == 4)
{
if(xmlhttp.status == 200)
{
var autoresponse=xmlhttp.responseText;
var automessage=document.getElementById('autosavetimebox');
if(autoresponse.indexOf("")!=-1)
{
automessage.innerHTML='您还没有添写信息，不用保存草稿';
return false;
}
if(autoresponse.indexOf("")!=-1)
{
automessage.innerHTML='保存成功，您可以在发生意外的时候载入草稿';
finddraft();
}
}
}
}
function finddraft()
{
if(allowajax==1)
{
var url="ajax.php?act=loaddraft";
makeSendData(null,'loaddraft','POST');
}
}
function loaddraft()
{
var draftbox=document.getElementById('draft');
if(xmlHttp.readyState < 4)
{
draftbox.innerHTML='草稿载入中...';
}
if(xmlHttp.readyState == 4)
{
if(xmlHttp.status == 200)
{
draftbox.innerHTML=xmlHttp.responseText;
}
}
}
function cleardraft()
{
if(allowajax==1)
{
var url="ajax.php?act=cleardraft";
makeSendData(null,'nodraft','POST');
}
}
function nodraft()
{
var draftbox=document.getElementById('draft');
if(xmlHttp.readyState < 4)
{
draftbox.innerHTML='载入中...';
}
if(xmlHttp.readyState == 4)
{
if(xmlHttp.status == 200)
{
draftbox.innerHTML=xmlHttp.responseText;
}
}
}
//encode string
function postencode (str) {
str=encodeURIComponent(str);
if (is_moz) str=str.replace(/%0A/g,"%0D%0A"); //from bob
return str;
}