Add new it_http class to itjs includes

1 files changed, 242 insertions, 0 deletions

diff --git a/itjs/http.js b/itjs/http.js
new file mode 100755
index 0000000..8615e98
--- /dev/null
+++ b/itjs/http.js
@@ -0,0 +1,242 @@
+/**
+ * Create http loader to request data from server
+ *
+ * @param cb Callback function or object with keys 'object', 'method', ['errorhandler']
+ */
+function it_http(cb)
+{
+	this.instance = it_http.instances++;
+	this.callback = cb ? cb : {};
+	this.req = null;
+	this.scrpt = [];
+	this.callid = 0;
+	this.busy = false;
+	
+	// register global reference
+	it_http['__inst' + this.instance] = this;
+}
+
+/* Methods */
+it_http.prototype = {
+
+/* send GET request and trigger callback */
+get: function(url, callback)
+{
+	if (typeof callback != 'undefined')
+		this.callback = callback;
+	this.send(url, 'GET');
+},
+
+/* send POST request with data and trigger callback */
+post: function(url, data, callback)
+{
+	if (typeof callback != 'undefined')
+		this.callback = callback;
+
+	var postdata = '';
+	if (typeof data == 'object') 
+	{
+		for (var k in data)
+			postdata += (postdata ? '&' : '') + it_url_encode(k) + "=" + it_url_encode(data[k]);
+	}
+	else
+		postdata = data;
+
+	this.send(url, 'POST', postdata);
+},
+
+/* private method that finally sends the request */
+send: function(url, method, postdata)
+{
+	this.stop();
+	
+	this.busy = true;
+	this.req = null;
+	var samehost = (url.indexOf('http://') < 0 || url.indexOf(window.location.hostname) > 0);
+
+	if (samehost) // use XMLHTTP request only if on same host
+	{
+		try
+		{
+			this.req = new XMLHttpRequest();
+		}
+		catch (e)
+		{
+			var classnames = [ 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP' ];
+
+			for (var i=0; i < classnames.length; i++)
+			{
+				try
+				{
+					this.req = new ActiveXObject(classnames[i]);
+					break;
+				}
+				catch (e) { }
+			}
+		}
+
+		try
+		{
+			this.req.open(method, url);
+			var me = this;
+			this.req.onreadystatechange = function() { me.ready_state_changed(); }
+			var workingxmlhttp = this.req.onreadystatechange;
+
+			if (!workingxmlhttp)		/* Old Konqueror */
+				this.req = null;
+		}
+		catch (e) { }
+	}
+
+	this.starttime = new Date().getTime();
+
+	if (this.req)
+	{
+		if (method == "POST")
+			this.req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+
+		this.req.send(postdata);
+	}
+	else
+	{
+		url += (url.match(/\?/) ? "&" : "?") + "itjs_call=it_http.__inst" + this.instance + "&itjs_callid=" + (++this.callid) + (postdata ? '&' + postdata : "");
+
+		if (samehost || (window.opera && !window.XMLHttpRequest))	 // Opera 7 only works with iframes
+		{
+				var scrpt = document.createElement("iframe");
+				scrpt.style.width = scrpt.style.height = 1;
+				url += "&itjs_iframe=1";
+		}
+		else
+		{
+			var scrpt = document.createElement("script");
+			this.req = { starttime: this.starttime };
+			try
+			{
+				this.scrpt[this.callid] = scrpt;
+				if (!document.all) scrpt.src = url;
+				document.body.appendChild(scrpt);
+				if (document.all) scrpt.src = url;
+			}
+			catch (e) { return false; }
+		}
+	}
+
+	return true;
+},
+
+ready_state_changed: function()
+{
+	var req = this.req; // Avoid race conditions
+
+	if (req && (req.readyState == 4))
+	{
+		var data = null;
+
+		try
+		{
+			if (req.responseText != "")
+				data = eval("(" + req.responseText + ")");
+		}
+		catch (e)
+		{
+			// trigger error handler (if defined)
+			if (typeof this.callback == 'object' && this.callback.errorhandler)
+			{
+				var obj = this.callback.object ? this.callback.object : window;
+				if (typeof obj[this.callback.errorhandler] == 'function')
+					obj[this.callback.errorhandler](req.responseText);
+			}
+			else
+				ED(e, req.responseText);
+		}
+
+		if (data)
+			this.dataReady(data, this.callid);
+
+		this.unlink(this.callid);
+	}
+},
+
+dataReady: function(data, callid)
+{
+	var fixkonqueror33gcbug = this.req;
+	var loadtime = new Date().getTime() - this.starttime;
+
+	this.req = null;
+
+	if ((typeof data == "object") && (this.callid == callid))
+	{
+		data.loadtime = loadtime;
+		
+		// trigger callback function
+		if (typeof this.callback == 'function')
+			this.callback(data);
+		else if (typeof this.callback == 'object' && this.callback.method)
+		{
+			// it_set(data, this.callback);
+			var obj = this.callback.object ? this.callback.object : window;
+			if (typeof obj[this.callback.method] == 'function')
+				obj[this.callback.method](data);
+		}
+	}
+},
+
+stop: function()
+{
+	try { this.req.abort(); }
+	catch (e) { }
+
+	this.unlink(this.callid);
+},
+
+unlink: function(callid)
+{
+	if (this.req)
+		this.req = null;
+
+	if (this.scrpt[callid])
+	{
+		if (!(document.all && String(navigator.userAgent).indexOf('MSIE 5.0') > 0))
+			document.body.removeChild(this.scrpt[callid]);
+		this.scrpt[callid] = null;
+	}
+
+	this.busy = false;
+} /* NO COMMA */
+
+}
+
+
+// static properties
+it_http.instances = 0;
+
+// static methods
+it_http.get_instance = function()
+{
+	var inst;
+	for (var i=0; i < it_http.instances; i++)
+		if ((inst = it_http['__inst'+i]) && inst.pub && !inst.busy)
+			return inst;
+	
+	inst = new it_http();
+	inst.pub = true;
+	return inst;
+}
+
+/* send GET request and trigger callback */
+it_http.get = function(url, callback)
+{
+	var inst = it_http.get_instance();
+	inst.callback = callback;
+	inst.get(url);
+}
+
+/* send POST request and trigger callback */
+it_http.post = function(url, postdata, callback)
+{
+	var inst = it_http.get_instance();
+	inst.callback = callback;
+	inst.post(url, postdata);
+}
+