Populated release branch

1 files changed, 275 insertions, 0 deletions

diff --git a/itjs/loader.js b/itjs/loader.js
new file mode 100644
index 0000000..de6ae9d
--- /dev/null
+++ b/itjs/loader.js
@@ -0,0 +1,275 @@
+/**
+ * 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.instance = it_loader.instances++;
+	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 };
+	this.method = "GET";
+	this.post_data = null;
+
+	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)
+	{
+		this.loader = null;
+		var samehost = (baseurl.indexOf('http://') < 0 || baseurl.indexOf(window.location.hostname) > 0);
+
+		if (retry)
+			baseurl += "&retry=" + retry;
+
+		// use XMLHTTP request if available
+		if (samehost)
+		{
+			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(this.method, 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) { }
+		}
+
+		this.starttime = new Date().getTime();
+		this.retry = retry;
+
+		if (this.loader)
+		{
+			if (this.method == "POST")
+				this.loader.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+
+			this.loader.send(this.post_data);
+		}
+		else
+		{
+			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 + "&itjs_callid=" + ++this.callid;
+
+			if (samehost || (window.opera && !window.XMLHttpRequest))  // Opera 7 only works with iframes
+			{
+				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: this.starttime, retry: retry };
+			try
+			{
+				if (!document.all) this.scrpt.src = req_url;
+				document.body.appendChild(this.scrpt);
+				if (document.all) this.scrpt.src = req_url;
+			}
+			catch (e) { return false; }
+		}
+	}
+	else
+		this.handler.render(this);
+
+	return true;
+},
+
+post: function(baseurl, data)
+{
+	this.clear();
+	this.method = "POST";
+	this.baseurl = baseurl;
+	this.start = this.end = 10;
+	this.post_data = "";
+
+	if (typeof data == 'object')
+	{
+		for (var k in data)
+			this.post_data += (this.post_data ? "&" : "") + k + "=" + escape(data[k]);
+	}
+	else
+		this.post_data = data;
+
+	this.load(baseurl, 0, 1, "");
+},
+
+readyStateChanged: function()
+{
+	var loader = this.loader;	// Avoid race conditions
+	it_loader.sequence += "r";
+
+	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;
+	it_loader.sequence += "e";
+
+	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);
+
+		it_loader.sequence += "h";
+	}
+
+	this.unlink();
+},
+
+stop: function()
+{
+	try
+	{
+		this.loader.abort();
+	}
+	catch (e) { }
+
+	this.unlink();
+},
+
+unlink: function()
+{
+	if (it_loader['__inst'+this.instance])
+		it_loader['__inst'+this.instance] = null;
+
+	if (this.loader)
+		this.loader = null;
+
+	if (this.scrpt)
+	{
+		document.body.removeChild(this.scrpt);
+		this.scrpt = null;
+	}
+
+	it_loader.sequence = "";
+}/* NO COMMA */
+
+}
+
+// static properties
+it_loader.instances = 0;
+it_loader.sequence = "";