Help understanding this iframe script

[david007]

Hi all . could any one explain this ifrome script to me. I perticulerly intrestend in know this part:


    //push url
    var pushURL = win.pushURL;
    win.pushURL = "";
    if (pushURL != "") {
        lpOnURLPush(pushURL);
    }

   //handle control command
   var controlCommand = win.controlCommand;
   win.controlCommand = "";
   if ((typeof(controlCommand) != "undefined") && (controlCommand != null) && (controlCommand != "")) {
      handleControlCommand(controlCommand);
   }

}

I want to know what does the above part is doing and also want to know how we can write server response to iframe so we can use it inside javascript.looking forward for some explaination here.Thanks

Code: [Select]

document.writeln('<div id="hiddentext" style="z-index:0;position:absolute;visibility:hidden;left:0;top:13px">'+
    '<iframe name="lpCommFrame" id="lpCommFrame" src="https://localhost/22121212/?cmd=file&file=chatTemplate&template=SYSTEM!lpCommFrame&amp;site=22121212&amp;sessionkey=H6766563567357947376K479024" frameborder="0" border="0" width="350" height="220" title="Background">'+
    'This functionality requires frames. </iframe>'+
'</div>');

document.writeln('<form id="lpSendText" action="https://localhost/hc/22121212/chatSend" method="post" target="lpCommFrame" >');
document.writeln('<input name="text" id="chatline" type="hidden" value="" />');
document.writeln('<input name="cmd"     type="hidden" value="file" />');
document.writeln('<input name="file"    type="hidden" value="chatText" />');
document.writeln('<input name="site"    type="hidden" value="5296924" />');
document.writeln('<input name="sessionkey" type="hidden" value="H6766563567357947376K479024" />');
document.writeln('</form>');

function jsHandleWidth(w)
{
if (w == 60) {
var u = "https://localhost/22121212/?cmd=file&file=chatText&site=22121212&sessionkey=H6766563567357947376K479024&d=" + jsGetDate();
document["lpCommFrame"].location = u;
} else
if (w == 70) {
loadAddins();
} else
if (w == 90) {
loop = false;
lpOnSendTextFail( lastText, 2);
}
}


function jsCheckCommFrame() {

var win = window.frames['lpCommFrame'];
try{
        if ((typeof(win) == "undefined") || (win.document.body == null) || (typeof(win.document.body) == "undefined"))
            return;
}catch(e){
    reportError(e,'jsCheckCommFrame_win');
    return;
    }

    //test for server error
var newtext = win.document.body.innerHTML;
if ( newtext!=null && typeof(newtext)!="undefined" && (newtext!="")) {
var controlmsg = newtext.substring(0,10);
if (controlmsg == "<br>Server") {
    lpOnSendTextFail( lastText, 1);
    return;
}
    }

    var textArray = win.chatLines;
    if(textArray==null) return;
    var lineCount = textArray.length;
    if (lineCount != prevLineCount) {
        prevLineCount = lineCount;

        //convert chat array
        var chatLines = new Array();
        for(iline=0;  iline<lineCount;  iline++){
            var jLine = textArray[iline];
            if(jLine.length!=4) continue;
            chatLines[iline] = new LPChatLine( jLine[0], jLine[1], jLine[2], jLine[3] );
        }
        if( lpLastLineIndex != chatLines.length ) {
            lpOnAddLines( chatLines, lpLastLineIndex );
            lpLastLineIndex = chatLines.length;
        }

        unsentLine = "";
        // If we have unsent lines because we switched from Java to Javascript - send the next line.
        if (sendingUnsentLines){
            sendUnsentLines();
        }
    }

    //push url
    var pushURL = win.pushURL;
    win.pushURL = "";
    if (pushURL != "") {
        lpOnURLPush(pushURL);
    }

//handle control command
var controlCommand = win.controlCommand;
win.controlCommand = "";
if ((typeof(controlCommand) != "undefined") && (controlCommand != null) && (controlCommand != "")) {
handleControlCommand(controlCommand);
}

}

function lpOnURLPush ( url ){
    var attr = "screenX=0,screenY=0,left=0,top=0,scrollbars=1,alwaysLowered=0,alwaysRaised=0,channelmode=0,dependent=0,directories=0,fullscreen=0,hotkeys=1,location=1,menubar=1,toolbar=1,status=1,titlebar=1,z-lock=0,resizable=1";
    attr = attr + ",height=" + screen.height + ",width=" + screen.width;
    window.open(url,"HCPushWindow",attr);
}

function handleControlCommand(controlCommand)
{
if (controlCommand == "loadAddins") {
loadAddins();
} else
if (controlCommand.indexOf("repTyping") == 0) {
var repTyping = controlCommand.indexOf("1") > -1;
lpOnRepTyping(repTyping);
} else
if (! handlePluginCommand(controlCommand)) ; // keep handling command
}