Not so long ago, I updated my browser-aware player code to check for the presence of a stream. Recently, it’s come to light that Internet Explorer 9 doesn’t play nice with this particular snippet, because in IE9, the Javascript engine is rather brain-damaged when it comes to cross-site requests. In order to deal with this properly, we must alter the way we query the server for the presence of a stream:

console.log("Starting stream Check");
if (is_ie9) {
console.log ("Using XDR because IE9 is stupid");
streamcheckXDR();
setInterval(function(){streamcheckXDR()},10000);
}
else {
streamcheck();
setInterval(function(){streamcheck()},10000);
}
function streamcheckXDR() {
 console.log("Starting XDR");
 xdr = new XDomainRequest();
 if(xdr) {
 xdr.onerror = function(){ console.log("XDR Error"); };
 xdr.onload = function(){ startPlayer(xdr.responseText,"XDR"); };
 url = "http://"+streamer+":8086/streamcheck?stream="+stream;
 xdr.open("get",url);
 xdr.send();
 } else {
 console.log("Failed to create XDR object");
 }

}

function startPlayer(result,mode){

// for some inexplicable reason, running "Boolean" on the XDR output doesn't work

// so we have to call the function and tell it if we're dealing with XDR data or AJAX data.

 

if(mode == "XDR") {
 if (result === "true") { curstatus = true;}
 if (result === "false") { curstatus = false;}
 } else {
 curstatus = Boolean(result);
 }

//console.log("Result: "+result);
 //console.log("Previous: "+prevstatus);
 //console.log("Current: "+curstatus);
 if (curstatus == prevstatus) {
 //console.log("No Change");
 } else {
 if (curstatus) {
 if (is_iphone || is_ipad || is_ipod) { iOSPlayer("videoframe",plwd,plht,server,stream);}
 else if (is_blackberry) { rtspPlayer("videoframe",plwd,plht,server,stream+'_+240p');}
 else { flashPlayer("videoframe",plwd,plht,server,stream); }
 console.log("Changed from false to true");
 } else {
 var vframe=document.getElementById("videoframe")
 if (is_iphone || is_ipad || is_ipod || is_blackberry) {
 } else {
 jwplayer("videoframe").remove();
 }
 vframe.innerHTML = '<IMG SRC="image.png" WIDTH="'+plwd+'" HEIGHT="'+plht+'">';


 console.log("Changed from true to false");
 }

}
 prevstatus = curstatus;
}

function streamcheck() {
 console.log("Starting AJAX");
 $.ajax({
 dataType: "json",
 contentType: "text/plain",

type: "GET",
 url: "http://"+streamer+":8086/streamcheck?stream="+stream,
 error: function(XMLHttpRequest, textStatus, errorThrown)
 {
 console.log('AJAX Failure:'+ textStatus+':'+errorThrown);
 //some stuff on failure
 },
 success: function(result){startPlayer(result)}
 });
}