php+ajax文章自动保存代码实例方法主是要方便用户,提高用户体验,我们就是用ajax把数据保存一个临时数据,像csdn一样,他可以自动保存用户的数据,这样就是掉电,出现意外你编辑的数据都不人被丢失.
这是自动保存草稿的核心的一部分,
autosavetime(sec) 这个函数是用来开始计时的
clearTimeout(autosavetimer);清除定时器
document.getElementById('autosavetimebox').innerHTML=sec+"秒";取得页面中的autosavetimebox对像,并向其写入倒计时
- if(sec>0) {
- autosavetimer = setTimeout("autosavetime("+sec+"-1)",1000);
-
- }else {
- var title=document.getElementById('title');
- if(title.value!=''){
- autosave_post();
- }else{
- document.getElementById('autosavetimebox').innerHTML='不用保存';
- } }
这一部分,就是当sec>0的条件不成立,呵呵,就是sec<=0的时候,开始执行保存草稿,首先会判断文章的标题是否为空,如果不会为空,就执行autosave_post()这个函数,否则就写入‘不用保存’.
php代码如下:
- 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;
- }
-
-
- xmlHttp.open(httptype, posturl, true);
-
-
- var changefunc="xmlHttp.onreadystatechange = "+functionName;
- 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("<autosave_error>")!=-1)
- {
- automessage.innerHTML='您还没有添写信息,不用保存草稿';
- return false;
- }
- if(autoresponse.indexOf("<autosave_ok>")!=-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 < 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,url,'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;
- }
- }
- }
-
- function postencode (str) {
- str=encodeURIComponent(str);
- if (is_moz) str=str.replace(/%0A/g, "%0D%0A");
- return str;
- }
自动保存的js代码,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='<a href="javascript教程:" onClick="javascript:stoptimer()">停止计时</a>';
- starttime==0 ? starttime=60 : starttime=starttime;
- autosavetime(starttime);
- }
- function stoptimer()
- {
- var autosavefunbox=document.getElementById('autosavefunbox');
- autosavefunbox.innerHTML='<a href="javascript:" onClick="javascript:startimer()">开始计时</a>';
- clearTimeout(autosavetimer);
- }
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