Added event listener system to etemplate2

etemplate/js/et2_widget.js

@@ -193,7 +193,13 @@ var et2_widget = Class.extend({
 		{
 			if (!_obj.attributes[key].ignore)
 			{
-				this.setAttribute(key, _obj.getAttribute(key));
+				var value = _obj.getAttribute(key);
+
+				// Check whether the attribute is undefined
+				if (typeof value != "undefined")
+				{
+					this.setAttribute(key, value);
+				}
 			}
 		}
 

etemplate/js/etemplate2.js

@@ -23,6 +23,7 @@
 	et2_selectbox;
 	et2_styles;
 	et2_html;
+	et2_tabs;
 
 	// Requirements for the etemplate2 object
 	et2_xml;
@@ -49,6 +50,9 @@ function etemplate2(_container, _menuaction)
 
 	// Preset the object variable
 	this.widgetContainer = null;
+
+	// Associative array with the event listeners
+	this.listeners = {};
 }
 
 /**
@@ -132,6 +136,9 @@ etemplate2.prototype.submit = function()
 	// Get the form values
 	var values = this.widgetContainer.getValues();
 
+	// Trigger the submit event
+	if (this.fireEvent("submit", [values]))
+	{
 		// Create the request object
 		if (typeof egw_json_request != "undefined")
 		{
@@ -140,9 +147,76 @@ etemplate2.prototype.submit = function()
 		}
 		else
 		{
-		console.log(values);
+			et2_debug("info", "Form got submitted with values: ", values);
 		}
 	}
+}
+
+/**
+ * Adds an callback function to the given event slot
+ * 
+ * @param _event is the name of the event
+ * @param _callback is the function which should be called once the event gets
+ * 	fired.
+ * @param _context is the context in which the function should be executed.
+ */
+etemplate2.prototype.addListener = function(_event, _callback, _context)
+{
+	// Add the event slot if it does not exist yet
+	if (typeof this.listeners[_event] == "undefined")
+	{
+		this.listeners[_event] = [];
+	}
+
+	this.listeners[_event].push({
+		"callback": _callback,
+		"context": _context
+	});
+}
+
+/**
+ * Removes the given callback function from the given event slot.
+ */
+etemplate2.prototype.removeListener = function(_event, _callback)
+{
+	if (typeof this.listeners[_event] != "undefined")
+	{
+		var events = this.listeners[_event];
+
+		for (var i = events.length - 1; i >= 0; i--)
+		{
+			if (events[i].callback == _callback)
+			{
+				events.splice(i, 1);
+			}
+		}
+	}
+}
+
+/**
+ * Fires the given event. The return values are conected via AND
+ */
+etemplate2.prototype.fireEvent = function(_event, _args)
+{
+	if (typeof _args == "undefined")
+	{
+		_args = [];
+	}
+
+	var result = true;
+
+	if (typeof this.listeners[_event] != "undefined")
+	{
+		var events = this.listeners[_event];
+
+		for (var i = 0; i < events.length; i++)
+		{
+			result = result && events[i].callback.apply(events[i].context, _args);
+		}
+	}
+
+	return result;
+}
 
 /**
  * Function which handles the EGW JSON et2_load response