opengate/javahtml/httpkeep.js

   1 //<!--
   2 var httpkeepUrl;
   3 var appletDescription;
   4 var httpObj;
   5 var nextKey;
   6 var nowKey;
   7 var sessionId;
   8
   9 function createXMLHttpRequest() {
  10   try { return new ActiveXObject("Msxml2.XMLHTTP");    } catch(e) {}
  11   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
  12   try { return new XMLHttpRequest();                   } catch(e) {}
  13   return null;
  14 }
  15
  16 function sendHello(){
  17
  18   // http communication
  19   if((httpObj=createXMLHttpRequest())!=null){
  20     httpObj.onreadystatechange = displayResponse;
  21
  22     try{
  23       httpObj.open("GET",httpkeepUrl+"-"+nowKey+"-"+hex_md5(nextKey+sessionId) ,true);
  24       httpObj.send(null);
  25       nowKey=nextKey;
  26       rand=Math.random();
  27       nextKey=hex_md5(String(rand));
  28     }catch(e){
  29       document.getElementById("watchdog").innerHTML = appletDescription;
  30     }
  31   }
  32
  33   // java communication
  34   else{
  35     document.getElementById("watchdog").innerHTML = appletDescription;
  36   }
  37 }
  38
  39 function displayResponse()
  40 {
  41   try{
  42     if(httpObj.readyState==4){
  43       if(httpObj.status==200){
  44         today=new Date;
  45         hh=today.getHours();  mm=today.getMinutes();
  46         if(hh<10)hh='0'+hh;   if(mm<10)mm='0'+mm;
  47         document.getElementById("dispmsg").innerHTML = hh+':'+mm;
  48         if(httpObj.responseText=="hello") sendHello();
  49       }else{
  50         document.getElementById("dispmsg").innerHTML = "Error!";
  51       }
  52     }
  53   }catch(e){
  54     document.getElementById("watchdog").innerHTML = appletDescription;
  55   }
  56 }
  57
  58 function initHttpkeep(urlArg, appletArg, sid)
  59 {
  60   // save arguments
  61   httpkeepUrl=urlArg;
  62   appletDescription=appletArg;
  63   nowKey=hex_md5(sid);
  64   sessionId=sid;
  65   rand=Math.random();
  66   nextKey=hex_md5(String(rand));
  67
  68   // set timeout and send hello
  69   sendHello();
  70 }
  71 //-->