I am having a problem that is driving me crazy and I am whits end. I am
hoping that someone here can help me. I have a client server application
where the client is drawing a progressive bar graph based on data
retrieved from the server once a second. The basic loop looks like this;
</HEAD>
<script language="JavaScript1.2">
var nodedatareq;
function buildGraphs() {
document.writeln("<BODY>");
// build graphs and add them
document.writeln("</BODY>");
window.addEventListener("resize",resizeEventHandle r, false);
}
function initXMLHTTPRequest() {
var xreq= null
if( window.XMLHttpRequest ) {
xreq= new XMLHttpRequest()
} else if(window.ActiveXObject) {
xreq= new ActiveXObject("Microsoft.XMLHTTP")
}
return xreq
}
function sendNodeRequest()
{
var mnodedataod="POST";
nodedatareq = initXMLHTTPRequest();
if( nodedatareq ) {
nodedataParam = "nodedata="+ escape(1)
nodedatareq.onreadystatechange=nodedataHandler
nodedatareq.open(mnodedataod,serverURL,true)
nodedatareq.setRequestHeader("Content-Type",
"application/x-www-form-urlencoded")
nodedatareq.send(nodedataParam)
}
}
function nodedataHandler() {
var ready= nodedatareq.readyState
var respStr=null
var index
if( ready == READY_STATE_COMPLETE ) {
respStr=nodedatareq.responseText
// plot data
timer = setTimeout(sendNodeRequest, 1000)
}
}
function resizeEventHandler(target, e)
{
// do nothing
}
buidGraphs()
timer = setTimeout(sendNodeRequest, 1000)
</script>
This works fine advancing the graphs and looping until I resize the
window. Once I do that the first time it reenters sendNodeRequest() I
get an error that initXMLHTTPRequest is undefined. I tried inlining the
code for initXMLHTTPRequest into sendNodeRequest but then it complains
thay nodedatareq is undefined. It is as if it has completely lost all of
its history and has no context or scope.
I have tried using
window.onresize = function(e) {resizeEventHandler(e);};
instead of window.addEventListener. I tried
window.onresize = function(e) {resizing = 1;};
so it didn't have to call a function, but that had the same results.
I also tried putting the call to window.addEventListener before the call
to buildGraphs. Then it didn't die but the event was not seviced either.
Anyone have any suggestions?
Thanks
Howard
