From 549a1b6dc0e96bfd5ddebe752d031bd5ed883a92 Mon Sep 17 00:00:00 2001
From: Thomas Brüderli
Date: Tue, 28 Aug 2007 14:18:50 +0000
Subject: Use <script> tags to enable data loading from foreign hosts

---
 itjs.class     | 13 ++++++++++---
 itjs/loader.js | 41 +++++++++++++++++++++++++++++------------
 2 files changed, 39 insertions(+), 15 deletions(-)

diff --git a/itjs.class b/itjs.class
index 86e9e86..22c5730 100644
--- a/itjs.class
+++ b/itjs.class
@@ -21,7 +21,7 @@ class itjs
  */
 function send_headers()
 {
-	if (!preg_match('/Opera/', $_SERVER['HTTP_USER_AGENT']) && !$_REQUEST['itjs_call'])	# text/plain breaks Opera 8.51/Linux and IFrame fallback
+	if (!preg_match('/Opera/', $_SERVER['HTTP_USER_AGENT']) && !$_REQUEST['itjs_iframe'])	# text/plain breaks Opera 8.51/Linux and IFrame fallback
 		header('Content-Type: text/plain; charset=iso-8859-1');	# Berni reported some Firewalls to require this
 
 	header('Expires: ' . gmdate('D, d M Y H:i:s', time()+10) . ' GMT');	# prevent broken data on IE reloads
@@ -37,8 +37,15 @@ function serialize($values)
 {
 	if ($callback = it::replace(array('[^\w.]' => ""), $_REQUEST['itjs_call']))
 	{
-		$header = "<script type='text/javascript'>$callback(";
-		$footer = "," . intval($_REQUEST['itjs_callid']) . ")</script>";
+		$target = $_REQUEST['itjs_iframe'] ? "parent" : "window";
+		$header = "$target.it_loader && $target.$callback(";
+		$footer = "," . intval($_REQUEST['itjs_callid']) . ");";
+
+		if ($_REQUEST['itjs_iframe'])	# iframe-based loading required by Opera 7
+		{
+			$header = '<script type="text/javascript">' . $header;
+			$footer .= "</script>";
+		}
 	}
 
 	return $header . itjs::encode($values) . $footer;
diff --git a/itjs/loader.js b/itjs/loader.js
index 2a29d8b..b5005ae 100644
--- a/itjs/loader.js
+++ b/itjs/loader.js
@@ -8,7 +8,7 @@ function it_loader(handler)
 	/* Clear cache etc. if completely new data */
 	this.loader = null;
 	this.handler = handler;
-	this.name = "it_loader";
+	this.instance = it_loader.instances++;
 	this.callid = 0;
 	this.clear();
 }
@@ -51,7 +51,7 @@ load: function(baseurl, pos, num, query_volatile, retry)
 	this.num = num;
 	this.query_volatile = query_volatile;
 
-	if (this.loader)
+	if (this.loader && this.loader.stop)
 		this.stop();
 
 	while ((num > 0) && this.entry[pos])
@@ -70,7 +70,8 @@ load: function(baseurl, pos, num, query_volatile, retry)
 
 		try
 		{
-			this.loader = new XMLHttpRequest();
+			if (!(baseurl.indexOf('http://') == 0 && baseurl.indexOf(window.location.hostname) < 0))
+				this.loader = new XMLHttpRequest();
 		}
 		catch (e)
 		{
@@ -110,23 +111,29 @@ load: function(baseurl, pos, num, query_volatile, retry)
 		}
 		else
 		{
-
-			if (!this.iframe)
+			var req_url = baseurl + "&pos=" + pos + "&num=" + num + (query_volatile ? query_volatile : "") + (this.post_data ? '&' + this.post_data : "") + "&itjs_call=it_loader.__inst" + this.instance + ".dataReady&itjs_callid=" + ++this.callid;
+			if (window.opera && !window.XMLHttpRequest)  // Opera 7 only works with iframes
 			{
-				this.iframe = document.createElement("iframe");
-				this.iframe.frameBorder = 0;
-				this.iframe.style.width = this.iframe.style.height = 1;
-				document.body.appendChild(this.iframe);
+				this.scrpt = document.createElement("iframe");
+				this.scrpt.style.width = this.scrpt.style.height = 1;
+				req_url += "&itjs_iframe=1";
 			}
+			else
+				this.scrpt = document.createElement("script");
 
+			it_loader['__inst'+this.instance] = this;
 			this.loader = { starttime: new Date().getTime(), retry: retry };
-			var loaderinstance = this.name;
-			window[loaderinstance] = this;
-			this.iframe.src = baseurl + "&pos=" + pos + "&num=" + num + (query_volatile ? query_volatile : "") + '&itjs_call=parent.' + loaderinstance + '.dataReady&itjs_callid=' + ++this.callid;
+			try {
+				this.scrpt.src = req_url;
+				document.body.appendChild(this.scrpt);
+			}
+			catch (e) { return false; }
 		}
 	}
 	else
 		this.handler.render(this);
+
+	return true;
 },
 
 post: function(baseurl, data)
@@ -215,6 +222,12 @@ dataReady: function(data, callid)
 		if (!this.attr.eof && (this.end < this.pos + this.num))
 			this.load(this.baseurl, this.end, this.pos + this.num - this.end);
 	}
+
+	if (this.scrpt)
+	{
+		document.body.removeChild(this.scrpt);
+		this.scrpt = null;
+	}
 },
 
 stop: function()
@@ -229,3 +242,7 @@ stop: function()
 }/* NO COMMA */
 
 }
+
+// static properties
+it_loader.instances = 0;
+
-- 
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