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How to use php+ajax to automatically save articles, _PHP tutorial

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2016-07-13 10:10:33753browse

php+ajax method to automatically save articles,

The example in this article describes the method of php+ajax to realize automatic saving of articles. Share it with everyone for your reference. The specific analysis is as follows:

The method of automatically saving articles in php+ajax is mainly to facilitate users and improve user experience. We use ajax to save the data as temporary data. Like csdn, it can automatically save the user's data. In this way, a power outage will occur. Unexpectedly, all the data you edited will be lost.

This is part of the core of auto-saving drafts,

autosavetime(sec) This function is used to start timing

clearTimeout(autosavetimer); clear timer

document.getElementById('autosavetimebox').innerHTML=sec+"seconds"; Get the autosavetimebox object in the page and write a countdown to it

Copy code The code is as follows:
if(sec>0) {
​​​ autosavetimer = setTimeout("autosavetime("+sec+"-1)",1000); 
//Here is if sec>0, the autosavetime function will be executed once in the first second, and the value of sec-1 will be written into the autosavetimebox
}else {
          var title=document.getElementById('title');
If(title.value!=''){
autosave_post();
            }else{
                   document.getElementById('autosavetimebox').innerHTML='No need to save';           }
}
This part is when the condition of sec>0 is not established, haha, when sec<=0, the save draft will be executed. First, it will determine whether the title of the article is empty. If it is not empty, the autosave_post() function will be executed. , otherwise write 'no need to save'.

The php code is as follows:


Copy code The code is as follows:
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 < 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;
        }
    }
}
//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:
复制代码 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='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);
}

I hope this article will be helpful to everyone’s PHP programming design.

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