javascript - Detect ajax request no connection status and state -

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i'm working pure javascript (no jquery , no others...) , i'm writing code make ajax request. noticed when internet connection fails, on chrome, firefox , ie values in xmlhttp.onreadystatechange:

xmlhttp.readystate=4 xmlhttp.status=0

since handle network connection problems way it?

xmlhttp.onreadystatechange=function(){      if(xmlhttp.readystate==4 && xmlhttp.status==0){//no internet connection          //code handle network error     } }

this code seems work me, haven't seen documentation abuot this, nowhere! think solid solution?

you can use online/offline events:

window.addeventlistener('load', function() {    var status = document.getelementbyid("status");      function updateonlinestatus(event) {      var condition = navigator.online ? "online" : "offline";        status.classname = condition;      status.innerhtml = condition.touppercase();        log.insertadjacenthtml("beforeend", "event: " + event.type + "; status: " + condition);    }      window.addeventlistener('online',  updateonlinestatus);    window.addeventlistener('offline', updateonlinestatus);  });
#status {    position : fixed;    width: 100%;    font : bold 1em sans-serif;    color: #fff:    padding : 0.5em  }    #log {    padding: 2.5em 0.5em 0.5em;    font: 1em sans-serif;  }    .online {    background: green;  }    .offline {    background: red;  }
<div id="status"></div>  <div id="log"></div>  <p>this test</p>


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