php+ajax实现文章自动保存的方法_PHP教程

var userAgent = navigator.userAgent.toLowerCase();
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,url,'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,url,'loaddraft','POST');
}
}
function loaddraft()
{
var draftbox=document.getElementById('draft');
if(xmlHttp.readyState {
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,url,'nodraft','POST');
}
}
function nodraft()
{
var draftbox=document.getElementById('draft');
if(xmlHttp.readyState {
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;
}
自动保存的js代码,代码如下:

代码如下:

var autosavetimer;
function autosavetime(sec) {
clearTimeout(autosavetimer);
document.getElementById('autosavetimebox').innerHTML=sec+"秒";
if(sec>0) {
autosavetimer = setTimeout("autosavetime("+sec+"-1)",1000);
}else {
var blogtitle=document.getElementById('title');
if(blogtitle.value!=''){
autosave_post();
}else{
document.getElementById('autosavetimebox').innerHTML='不用保存';
}
}
}
function startimer()
{
var starttime=document.getElementById('autosavetimebox').innerHTML;
if(starttime=='保存成功，您可以在发生意外的时候载入草稿' || starttime=='您还没有添写信息，不用保存草稿')
{
starttime='60';
}else{
starttime=starttime.replace('秒','');
}
var autosavefunbox=document.getElementById('autosavefunbox');
autosavefunbox.innerHTML='停止计时';
starttime==0 ? starttime=60 : starttime=starttime;
autosavetime(starttime);
}
function stoptimer()
{
var autosavefunbox=document.getElementById('autosavefunbox');
autosavefunbox.innerHTML='开始计时';
clearTimeout(autosavetimer);
}

 

希望本文所述对大家的php程序设计有所帮助。

http://www.bkjia.com/PHPjc/975882.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/975882.htmlTechArticlephp+ajax实现文章自动保存的方法 这篇文章主要介绍了php+ajax实现文章自动保存的方法,可实现文章内容的实时保存,防止突发情况下的数据丢失...