please help ping from client browser

nlicata · June 10th, 2004, 01:46 AM

Using basic client script I need to have a client browser ping or check for connection state to a predetermined server in code (filled dynamically).. There is no server involved, it is a web page in a data stream from C++.

The ROM chip sends a web page (like linksys router config pages) and I now have a client side refresh in there, but I need the refresh to only ocurr if the site is available (because ROM chip machine may be rebooting).. It just needs to be simple client side (any language) script that will ping or check for connection state (like session.isConnected in asp)...

Someone please help, I will be done with this is finished....
thanks,
Nick

ChrisScott · June 10th, 2004, 12:23 PM

Hi Nick,

This will work in IE with MSXML4 installed...

<html>

<head>
<title>Scrap</title>
<script type="text/javascript">
var xmlHttp;
function SetRefreshTimer(){
    // attempt refresh after 10 seconds
    setTimeout("DoRefresh()", 10000);
}
function DoRefresh(){
    xmlHttp = new ActiveXObject("Msxml2.XmlHttp.4.0");
    xmlHttp.open("GET", window.location.href);
    xmlHttp.send();
    if(xmlHttp.status == 200){
        window.location.reload();
    }else{
        SetRefreshTimer();
    }
}
</script>
</head>

<body onload="SetRefreshTimer();">
</body>

</html>

HTH,

Chris