From a5a19fd672bc0b8113d620669b557f17dccd343a Mon Sep 17 00:00:00 2001
From: Christian Schneider
Date: Thu, 26 Oct 2006 13:35:12 +0000
Subject: Moved itools to live branch

---
 itjs/loader.js | 207 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 207 insertions(+)
 create mode 100644 itjs/loader.js

(limited to 'itjs/loader.js')

diff --git a/itjs/loader.js b/itjs/loader.js
new file mode 100644
index 0000000..19f5f9c
--- /dev/null
+++ b/itjs/loader.js
@@ -0,0 +1,207 @@
+/**
+ * Create loader to request data from server
+ *
+ * @param handler Object providing clear()/render() function when data arrives
+ */
+function it_loader(handler)
+{
+	/* Clear cache etc. if completely new data */
+	this.loader = null;
+	this.handler = handler;
+	this.name = "it_loader";
+	this.callid = 0;
+	this.clear();
+}
+
+/* Methods */
+it_loader.prototype =
+{
+
+/* Clear cache and initialize handler */
+clear: function()
+{
+	/* Clear cache etc. if completely new data */
+	this.entry = new Array();
+	this.start = this.end = 0;
+	this.attr = { num: 0, loadtime: 0 };
+
+	if (this.handler.clear)
+		this.handler.clear();
+},
+
+load: function(baseurl, pos, num, query_volatile, retry)
+{
+	/* Convert to int */
+	pos -= 0;
+	num -= 0;
+
+	if (isNaN(retry))
+		retry = 0;
+
+	if (baseurl != this.baseurl)
+	{
+		this.clear();
+		this.baseurl = baseurl;
+		this.start = this.end = pos;
+	}
+
+	this.pos = pos;
+	this.num = num;
+	this.query_volatile = query_volatile;
+
+	if (this.loader)
+		this.stop();
+
+	while ((num > 0) && this.entry[pos])
+	{
+		pos++;
+		num--;
+	}
+
+	if (this.attr.eof)
+		num = Math.min(num, this.end - pos);
+
+	if (num > 0)
+	{
+		if (retry)
+			baseurl += "&retry=" + retry;
+
+		try
+		{
+			this.loader = new XMLHttpRequest();
+		}
+		catch (e)
+		{
+			var classnames = [ 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP' ];
+
+			for (var i in classnames)
+			{
+				try
+				{
+					this.loader = new ActiveXObject(classnames[i]);
+					break;
+				}
+				catch (e) {}
+			}
+		}
+
+		try
+		{
+			this.loader.open("GET", baseurl + "&pos=" + pos + "&num=" + num + (query_volatile ? query_volatile : ""));
+			var me = this;
+			this.loader.onreadystatechange = function() { me.readyStateChanged(); }
+			var workingxmlhttp = this.loader.onreadystatechange;
+
+			if (!workingxmlhttp)    /* Old Konqueror */
+				this.loader = null;
+		}
+		catch (e) { }
+
+		if (this.loader)
+		{
+			this.starttime = new Date().getTime();
+			this.retry = retry;
+			this.loader.send(null);
+		}
+		else
+		{
+
+			if (!this.iframe)
+			{
+				this.iframe = document.createElement("iframe");
+				this.iframe.frameBorder = 0;
+				this.iframe.style.width = this.iframe.style.height = 1;
+				document.body.appendChild(this.iframe);
+			}
+
+			this.loader = { starttime: new Date().getTime(), retry: retry };
+			var loaderinstance = this.name;
+			window[loaderinstance] = this;
+			this.iframe.src = baseurl + "&pos=" + pos + "&num=" + num + '&itjs_call=parent.' + loaderinstance + '.dataReady&itjs_callid=' + ++this.callid;
+		}
+	}
+	else
+		this.handler.render(this);
+},
+
+readyStateChanged: function()
+{
+	var loader = this.loader;	// Avoid race conditions
+
+	if (loader && (loader.readyState == 4))
+	{
+		var data = null;
+
+		try
+		{
+			if (loader.responseText != "")
+				data = eval("("+ loader.responseText + ")");
+		}
+		catch (e)
+		{
+			var retry = this.retry + 1;
+
+			if (retry < 10)
+				it_timer({ object: this, method: "retryload", timeout: Math.pow(5, Math.min(retry, 5)), baseurl: this.baseurl, pos: this.pos, num: this.num, query_volatile: this.query_volatile, retry: retry });
+			else
+				ED(e, loader.responseText);
+		}
+
+		if (data)
+			this.dataReady(data, this.callid);
+	}
+},
+
+retryload: function(p)
+{
+	this.load(p.baseurl, p.pos, p.num, p.query_volatile, p.retry);
+},
+
+dataReady: function(data, callid)
+{
+	var fixkonqueror33gcbug = this.loader;
+	var loadtime = new Date().getTime() - this.starttime;
+
+	this.loader = null;
+
+	if ((typeof data == "object") && (this.callid == callid))
+	{
+		this.attr = { loadtime: loadtime };
+
+		for (var key in data)
+		{
+			var value = data[key];
+			var id = key - 0;
+
+			if (!isNaN(id))
+			{
+				this.start = Math.min(this.start, id);
+				this.end = Math.max(this.end, id + 1);
+				this.entry[id] = data[key];
+			}
+			else
+				this.attr[key] = data[key];
+		}
+
+		if (this.attr.eof)
+			this.attr.num = this.end;	/* Fix bogus # of result value */
+
+		this.handler.render(this);
+
+		if (!this.attr.eof && (this.end < this.pos + this.num))
+			this.load(this.baseurl, this.end, this.pos + this.num - this.end);
+	}
+},
+
+stop: function()
+{
+	try
+	{
+		this.loader.abort();
+	}
+	catch (e) { }
+
+	this.loader = null;
+}/* NO COMMA */
+
+}
-- 
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