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source: trunk/autoquest-htmlmonitor/src/main/js/autoquest-htmlmonitor.js @ 1005

Last change on this file since 1005 was 999, checked in by pharms, 12 years ago
added support for further event types added automatic sending of data after an interaction timeout corrected encoding of Strings in JSON
File size: 26.7 KB

Line
1	// Copyright 2012 Georg-August-Universität Göttingen, Germany
2	//
3	// Licensed under the Apache License, Version 2.0 (the "License");
4	// you may not use this file except in compliance with the License.
5	// You may obtain a copy of the License at
6	//
7	// http://www.apache.org/licenses/LICENSE-2.0
8	//
9	// Unless required by applicable law or agreed to in writing, software
10	// distributed under the License is distributed on an "AS IS" BASIS,
11	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12	// See the License for the specific language governing permissions and
13	// limitations under the License.
14
15	/**
16	* AutoQUEST - HTML Monitor
17	*
18	* Description: This script records the interactions done by an user on an
19	* HTML-Website and sends them to a server. It does not register actions on
20	* Flash, Java, or other special inputs. This script is tested on Firefox
21	* 15.0.1.
22	*
23	* To insert it on your HTML-side, you need to write <script
24	* language="JavaScript" type="text/javascript" src="autoquest-htmlmonitor.js"></script> in the
25	* head and change the src-attribute to the location, you have chosen for this
26	* script.
27	*
28	* To change the recorded events, edit the action config array. If you want to change
29	* the server where the data is send to, rewrite the destination variable. The
30	* records are send to the server, JSON-formatted, if there are 10 inputs or the
31	* user changes/closes the site.
32	*
33	* Authors: Simon Leidenbach, Simon Reuss, Patrick Harms
34	*
35	* Version: 0.1
36	*/
37
38	/**
39	* the server to send the recorded data to
40	*/
41	var autoquestDestination;
42
43	/**
44	* an ID that is more or less unique for the client
45	*/
46	var autoquestClientId;
47
48	/**
49	* the maximum number of recorded events to be put into one package sent to the server
50	*/
51	var autoquestPackageSize = 10;
52
53	/**
54	* this variable defines the tags for which event handling shall be added, as well as the
55	* event handling action to be monitored
56	*/
57	var autoquestActionConfig = [
58	{ "tag": "a", "actions": [ "onclick",
59	"onfocus" ] },
60	//{ "tag": "abbr", "actions": [ ] },
61	//{ "tag": "address", "actions": [ ] },
62	//{ "tag": "applet", "actions": [ ] },
63	{ "tag": "area", "actions": [ "onclick",
64	"onfocus" ] },
65	//{ "tag": "article", "actions": [ ] },
66	//{ "tag": "aside", "actions": [ ] },
67	{ "tag": "audio", "actions": [ "onplaying",
68	"onpause",
69	"ontimeupdate" ] },
70	{ "tag": "b", "actions": [ "onclick" ] },
71	//{ "tag": "bdi", "actions": [ ] },
72	//{ "tag": "bdo", "actions": [ ] },
73	//{ "tag": "blockquote", "actions": [ ] },
74	{ "tag": "body", "actions": [ "onbeforeunload",
75	"onload",
76	"onunload",
77	//"onerror",
78	"onscroll",
79	"onpagehide",
80	"onpageshow",
81	"onundo" ] },
82	{ "tag": "button", "actions": [ "onclick",
83	"onfocus" ] },
84	{ "tag": "canvas", "actions": [ "onclick" ] },
85	//{ "tag": "caption", "actions": [ ] },
86	{ "tag": "cite", "actions": [ "onclick" ] },
87	{ "tag": "code", "actions": [ "onclick" ] },
88	//{ "tag": "col", "actions": [ ] },
89	//{ "tag": "colgroup", "actions": [ ] },
90	{ "tag": "command", "actions": [ "onclick",
91	"onfocus" ] },
92	//{ "tag": "datalist", "actions": [ ] },
93	{ "tag": "dd", "actions": [ "onclick" ] },
94	{ "tag": "del", "actions": [ "onclick" ] },
95	//{ "tag": "details", "actions": [ ] },
96	{ "tag": "dfn", "actions": [ "onclick" ] },
97	{ "tag": "div", "actions": [ "onclick" ] },
98	//{ "tag": "dl", "actions": [ ] },
99	{ "tag": "dt", "actions": [ "onclick" ] },
100	{ "tag": "em", "actions": [ "onclick" ] },
101	{ "tag": "embed", "actions": [ "onclick" ] },
102	//{ "tag": "fieldset", "actions": [ ] },
103	//{ "tag": "figcaption", "actions": [ ] },
104	//{ "tag": "figure", "actions": [ ] },
105	//{ "tag": "footer", "actions": [ ] },
106	{ "tag": "form", "actions": [ "onreset",
107	"onsubmit" ] },
108	//{ "tag": "header", "actions": [ ] },
109	//{ "tag": "hgroup", "actions": [ ] },
110	{ "tag": "h1", "actions": [ "onclick" ] },
111	{ "tag": "h2", "actions": [ "onclick" ] },
112	{ "tag": "h3", "actions": [ "onclick" ] },
113	{ "tag": "h4", "actions": [ "onclick" ] },
114	{ "tag": "h5", "actions": [ "onclick" ] },
115	{ "tag": "h6", "actions": [ "onclick" ] },
116	//{ "tag": "hr", "actions": [ ] },
117	{ "tag": "i", "actions": [ "onclick" ] },
118	//{ "tag": "iframe", "actions": [ ] },
119	{ "tag": "img", "actions": [ "onabort",
120	"onclick" ] },
121	{ "tag": "input_text", "actions": [ "onchange",
122	"onfocus",
123	"onselect" ] },
124	{ "tag": "input_password", "actions": [ "onchange",
125	"onfocus" ] },
126	{ "tag": "input_checkbox", "actions": [ "onchange",
127	"onclick",
128	"onfocus" ] },
129	{ "tag": "input_radio", "actions": [ "onchange",
130	"onclick",
131	"onfocus" ] },
132	{ "tag": "input_submit", "actions": [ "onclick",
133	"onfocus" ] },
134	{ "tag": "input_reset", "actions": [ "onclick",
135	"onfocus" ] },
136	{ "tag": "input_file", "actions": [ "onclick",
137	"onfocus" ] },
138	{ "tag": "input_image", "actions": [ "onclick",
139	"onfocus" ] },
140	{ "tag": "input_button", "actions": [ "onclick",
141	"onfocus" ] },
142	{ "tag": "input", "actions": [ "onchange",
143	"onfocus" ] },
144	{ "tag": "ins", "actions": [ "onclick" ] },
145	{ "tag": "kbd", "actions": [ "onclick" ] },
146	{ "tag": "keygen", "actions": [ "onchange",
147	"onfocus" ] },
148	//{ "tag": "label", "actions": [ ] },
149	//{ "tag": "legend", "actions": [ ] },
150	{ "tag": "li", "actions": [ "onclick" ] },
151	//{ "tag": "map", "actions": [ ] },
152	{ "tag": "mark", "actions": [ "onclick" ] },
153	{ "tag": "menu", "actions": [ "onclick" ] },
154	{ "tag": "meter", "actions": [ "onclick" ] },
155	//{ "tag": "nav", "actions": [ ] },
156	//{ "tag": "noscript", "actions": [ ] },
157	{ "tag": "object", "actions": [ "onclick" ] },
158	//{ "tag": "ol", "actions": [ ] },
159	//{ "tag": "optgroup", "actions": [ ] },
160	//{ "tag": "option", "actions": [ ] },
161	{ "tag": "output", "actions": [ "onclick" ] },
162	{ "tag": "p", "actions": [ "onclick" ] },
163	//{ "tag": "param", "actions": [ ] },
164	//{ "tag": "pre", "actions": [ ] },
165	{ "tag": "progress", "actions": [ "onclick" ] },
166	{ "tag": "q", "actions": [ "onclick" ] },
167	//{ "tag": "rp", "actions": [ ] },
168	//{ "tag": "rt", "actions": [ ] },
169	//{ "tag": "ruby", "actions": [ ] },
170	{ "tag": "s", "actions": [ "onclick" ] },
171	{ "tag": "samp", "actions": [ "onclick" ] },
172	//{ "tag": "section", "actions": [ ] },
173	{ "tag": "select", "actions": [ "onchange",
174	"onfocus" ] },
175	{ "tag": "small", "actions": [ "onclick" ] },
176	//{ "tag": "source", "actions": [ ] },
177	{ "tag": "span", "actions": [ "onclick" ] },
178	{ "tag": "strong", "actions": [ "onclick" ] },
179	//{ "tag": "sub", "actions": [ ] },
180	//{ "tag": "summary", "actions": [ ] },
181	//{ "tag": "sup", "actions": [ ] },
182	//{ "tag": "table", "actions": [ ] },
183	//{ "tag": "tbody", "actions": [ ] },
184	{ "tag": "td", "actions": [ "onclick" ] },
185	{ "tag": "textarea", "actions": [ "onchange",
186	"onfocus",
187	"onselect" ] },
188	//{ "tag": "tfoot", "actions": [ ] },
189	{ "tag": "th", "actions": [ "onclick" ] },
190	//{ "tag": "thead", "actions": [ ] },
191	{ "tag": "time", "actions": [ "onclick" ] },
192	//{ "tag": "tr", "actions": [ ] },
193	//{ "tag": "track", "actions": [ ] },
194	{ "tag": "u", "actions": [ "onclick" ] },
195	//{ "tag": "ul", "actions": [ ] },
196	{ "tag": "var", "actions": [ "onclick" ] },
197	{ "tag": "video", "actions": [ "onplaying",
198	"onpause",
199	"ontimeupdate" ] },
200	//{ "tag": "wbr", "actions": [ ] },
201	];
202
203	/**
204	* a possibility to trace, what is going on
205	*/
206	var autoquestDoLog = false;
207
208	/*var matchedTags = ["A", "ABBR", "ACRONYM", "ADDRESS", "AREA", "B", "BIG", "BLOCKQUOTE", "BODY",
209	"BUTTON", "CAPTION", "CENTER", "CITE", "CODE", "COL", "COLGROUP", "DD", "DEL",
210	"DFN", "DIR", "DIV", "DL", "DT", "EM", "FIELDSET", "FORM", "H1", "H2", "H3",
211	"H4", "H5", "H6", "HR", "I", "IMG", "INPUT", "INS", "KBD", "LABEL", "LEGEND",
212	"LI", "LINK", "MAP", "MENU", "NOFRAMES", "NOSCRIPT", "OBJECT", "OL",
213	"OPTGROUP", "OPTION", "P", "PRE", "Q", "S", "SAMP", "SELECT", "SMALL", "SPAN",
214	"STRIKE", "STRONG", "SUB", "SUP", "TABLE", "TBODY", "TD", "TEXTAREA", "TFOOT",
215	"TH", "THEAD", "TR", "TT", "U", "UL", "VAR"];*/
216	/*var actions = ['onclick', 'ondblclick', 'onkeypress', 'onkeydown', 'onkeyup',
217	'onmouseout' , 'onmousemove' ,'onfocus','onscroll']; // edit*/
218
219	/**
220	* stores events, which were recorded but not sent to the server yet
221	*/
222	var autoquestRecordedEvents = [];
223
224	/**
225	* stores the interval for sending data of inactive browser windows
226	*/
227	var autoquestSendInterval;
228
229	/**
230	* automatically executed to initialize the event handling
231	*/
232	(function() {
233	initEventHandling();
234	}());
235
236
237	/**
238	* initializes the event handling after the document is loaded completely
239	*/
240	function initEventHandling() {
241	if (document.body) {
242	log("adding event handling attributes");
243	determineDestination();
244	addEventHandlingAttributes(document.documentElement, "");
245
246	if (document.readyState !== "complete") {
247	// if the document is not loaded yet, try to add further event handling later
248	setTimeout(initEventHandling, 200);
249	}
250	else if (!autoquestSendInterval) {
251	// recall sending data each 100 seconds to ensure, that for browser windows staying
252	// open the data will be send, as well.
253	autoquestSendInterval = setTimeout(sendRequest, 100000);
254	}
255	}
256	else {
257	setTimeout(initEventHandling, 200);
258	}
259	}
260
261	/**
262	* traverses the DOM-structure of the HTML-site and determines the URL of this script. Based on
263	* this URL, it calculates the destination to which the traced interactions must be sent
264	*/
265	function determineDestination() {
266	var scriptElements = document.getElementsByTagName("script");
267	var i;
268	var index;
269
270	for (i = 0; i < scriptElements.length; i++) {
271	if ((scriptElements[i].type === "text/javascript") && (scriptElements[i].src)) {
272	index = scriptElements[i].src.lastIndexOf("script/autoquest-htmlmonitor.js");
273	if (index > -1) {
274	autoquestDestination = scriptElements[i].src.substring(0, index - 1);
275	log("using destination " + autoquestDestination);
276	}
277	}
278	}
279	}
280
281	/**
282	* traverses the DOM-structure of the HTML-site and adds event handling attributes to each
283	* relevant node
284	*
285	* @param node the node of the DOM structure that shall be adapted and whose children shall
286	* be traversed
287	* @param parentPath the path to the parent node of the provided node within the DOM-structure of
288	* the HTML-site
289	*/
290	function addEventHandlingAttributes(node, parentPath) {
291	var nodePath;
292	var i;
293	var k;
294	var value;
295
296	if (node.nodeType === Node.ELEMENT_NODE) {
297	nodePath = getNodePath(node, parentPath);
298
299	for (i = 0; i < autoquestActionConfig.length; i++) {
300	if (getTagName(node) === autoquestActionConfig[i].tag.toLowerCase()) {
301	for (k = 0; k < autoquestActionConfig[i].actions.length; k++) {
302	value = "handleEvent(this, '" +
303	autoquestActionConfig[i].actions[k] + "', '" +
304	nodePath + "', event);";
305
306	if (!node.getAttribute(autoquestActionConfig[i].actions[k])) {
307	node.setAttribute(autoquestActionConfig[i].actions[k], value);
308	}
309	else {
310	var oldValue = node.getAttribute(autoquestActionConfig[i].actions[k]);
311	if (oldValue.indexOf(value) < 0) {
312	node.setAttribute(autoquestActionConfig[i].actions[k],
313	value + ' ' + oldValue);
314	}
315	}
316	}
317	}
318	}
319
320	for (i = 0; i < node.childNodes.length; i++) {
321	addEventHandlingAttributes(node.childNodes[i], nodePath);
322	}
323	}
324	}
325
326	/**
327	* generates a path through the DOM-structure of the HTML-site depending on a node and the path
328	* to its parent node. The result is the parent path plus a path element for the provided node.
329	* The first part of the path element generated for the node is the tag name returned by
330	* {@link #getTagName(node)}. If the node has an id, it becomes the second part of the path
331	* element. If the node does not have an id, the method calculates the index of the node within
332	* all children of the same type within the parent node. This index becomes then the second part
333	* of the path element generated for the node.
334	*
335	* @param node the node of the DOM structure for which the path shall be created
336	* @param parentPath the path to the parent node of the provided node
337	*
338	* @returns a path in the DOM-structure of the HTML-site including the parent path an a path
339	* element for the provided node
340	*/
341	function getNodePath(node, parentPath) {
342	var nodePath = parentPath + "/";
343	var index = -1;
344	var i = 0;
345
346	nodePath += getTagName(node);
347
348	if ((node.id) && (node.id !== "")) {
349	nodePath += "(id=" + node.id + ")";
350	}
351	else {
352	if (node.parentNode) {
353	for (i = 0; i < node.parentNode.childNodes.length; i++) {
354	if (node.parentNode.childNodes[i].tagName === node.tagName) {
355	index++;
356	// if === also returns true if the nodes are not identical but only equal,
357	// this may fail.
358	if (node.parentNode.childNodes[i] === node) {
359	break;
360	}
361	}
362	}
363
364	}
365	else {
366	index = 0;
367	}
368
369	nodePath += "[" + index + "]";
370	}
371
372	return nodePath;
373	}
374
375	/**
376	* handles an event that happened on a node. This method is called by the event handling attributes
377	* of the nodes. These attributes are generated by the
378	* {@link #addEventHandlingAttributes(node,parentPath)} function. It creates a new Event object and
379	* adds it to the list of <code>autoquestRecordedEvents</code>. If this list achieves the maximum
380	* <code>autoquestPackageSize</code> the events in the list are sent to the server asynchronously
381	* through calling {@link #sendRequest()}.
382	*
383	* @param node the node that fired the event
384	* @param eventName the name of the event, e.g. onscroll
385	* @param nodePath the path to the node in the HTML DOM on which the event occurred
386	* @param event the HTML event that occured
387	*/
388	function handleEvent(node, eventName, nodePath, event) {
389	var eventType;
390	var eventObj = null;
391	var tagName;
392
393	if (!autoquestDestination) {
394	// do nothing if we have no destination to send data to
395	return;
396	}
397
398	log("handling event " + eventName + " on " + node);
399
400	eventType = eventName.toLowerCase();
401
402	if (autoquestRecordedEvents.length > 0) {
403	eventObj = autoquestRecordedEvents[autoquestRecordedEvents.length - 1];
404
405	// check if an event showed up several times either for the same or for a parent GUI element
406	if ((eventObj.type === eventName) && (eventObj.nodePath.indexOf(nodePath) === 0)) {
407	// the event is of the same type.
408	if (eventObj.nodePath.length > nodePath.length) {
409	// the same event showed up for the parent GUI element. This must not be handled.
410	// So ignore it
411	log("discarding event " + eventName + " on " + node +
412	" as it is already handled by a child");
413	return;
414	}
415	else if (eventName !== "onscroll") {
416	// we have the same event on the same element. If it is an onscroll, we should
417	// reuse it. But it is not an onscroll. So we ignore the existing event.
418	eventObj = null;
419	}
420	}
421	else {
422	// the event is not of an equal type as the previous one. So we will not reuse it
423	eventObj = null;
424	}
425	}
426
427	if (!eventObj) {
428	// create a new event and add it to the list
429	eventObj = new Event(eventType, nodePath);
430	log("storing event " + eventName);
431	autoquestRecordedEvents.push(eventObj);
432	}
433
434	// now add further event parameters
435	if ((eventType === "onclick") \|\| (eventType === "ondblclick")) {
436	eventObj.setClickCoordinates(getEventCoordinates(event));
437	}
438
439	tagName = getTagName(node);
440
441	if ("input_password" !== tagName) {
442	if ((eventType === "onkeypress") \|\|
443	(eventType === "onkeydown") \|\|
444	(eventType === "onkeyup"))
445	{
446	eventObj.setKey(event.keyCode);
447	}
448	else if (eventType == "onchange") {
449	if ((tagName.indexOf("input") === 0) \|\|
450	(tagName === "textarea") \|\|
451	(tagName === "keygen"))
452	{
453	eventObj.setSelectedValue(node.value);
454	}
455	else if (tagName === "select") {
456	eventObj.setSelectedValue(node.options.item(node.options.selectedIndex));
457	}
458	}
459	}
460
461	if (eventType === "onscroll") {
462	eventObj.setScrollPosition(getScrollCoordinates(node));
463	}
464
465	if (autoquestRecordedEvents.length >= autoquestPackageSize) {
466	log("initiating sending events");
467	setTimeout(sendRequest, 100);
468	}
469	else if ((eventType === "onunload") \|\| (eventType === "onbeforeunload")) {
470	log("initiating sending events");
471	sendRequest();
472	}
473
474	}
475
476	/**
477	* determines a tag name of a node. If the node is an input element, the tag name includes the
478	* type of element. Otherwise the method simply returns the tag name.
479	*
480	* @param node the node for which the name must be determined
481	*
482	* @return the name as described
483	*/
484	function getTagName(node) {
485	var tagName = null;
486
487	if (node.tagName) {
488	tagName = node.tagName.toLowerCase();
489	if ("input" === tagName) {
490	if (node.type && (node.type !== "")) {
491	tagName += "_" + node.type;
492	}
493	else {
494	tagName += "_text";
495	}
496	}
497	}
498
499	return tagName;
500	}
501
502	/**
503	* sends the collected data to the server, named in the destination-variable. For this it generates
504	* a JSON formatted message and uses Ajax and the <code>autoquestDestination</code> to send it to
505	* the server
506	*/
507	function sendRequest() {
508	var eventList;
509	var message;
510	var clientId;
511	var i = 0;
512	var request;
513
514	if (autoquestRecordedEvents.length > 0) {
515	log("creating message");
516	eventList = autoquestRecordedEvents;
517
518	// put the last event into the new list to allow for checks for reoccurence of the same
519	// event
520	autoquestRecordedEvents = [ eventList.pop() ];
521
522	message = "{\"message\":{\"clientInfos\":{";
523
524	log("reading client id");
525	clientId = getClientId();
526	if ((clientId) && (clientId !== "")) {
527	message += "\"clientId\":\"" + clientId + "\",";
528	}
529
530	log("adding other infos");
531	message += "\"userAgent\":\"" + navigator.userAgent + "\",";
532	message += "\"title\":\"" + document.title + "\",";
533	message += "\"url\":\"" + document.URL + "\"},";
534
535
536	message += "\"events\":[";
537
538	for (i = 0; i < eventList.length; i++) {
539	if (i > 0) {
540	message += ",";
541	}
542	message += eventList[i].toJSON();
543	}
544
545	message += "]}}";
546
547	request = null;
548
549	// Mozilla
550	if (window.XMLHttpRequest) {
551	request = new XMLHttpRequest();
552	}
553	// IE
554	else if (window.ActiveXObject) {
555	request = new ActiveXObject("Microsoft.XMLHTTP");
556	}
557
558	request.open("POST", autoquestDestination, false);
559	request.setRequestHeader("Content-Type", "application/json");
560
561	log("sending " + message);
562	request.send(message);
563	}
564	}
565
566	/**
567	* determines the scroll coordinates of the scrolled element
568	*
569	* @param node the element that was scrolled
570	*
571	* @returns the coordinates of the scrolling as an array with x and y coordinate
572	*/
573	function getScrollCoordinates(node) {
574	if (node.scrollLeft \|\| node.scrollTop) {
575	return [node.scrollLeft, node.scrollTop];
576	}
577	else if ((node === window) && window.pageYOffset) {
578	return [window.pageXOffset, window.pageYOffset];
579	}
580	else if ((node == document) \|\| (node == document.body) \|\| (node == document.documentElement)) {
581	if (document.body && (document.body.scrollLeft \|\| document.body.scrollTop)) {
582	return [document.body.scrollLeft, document.body.scrollTop];
583	}
584	else if (document.documentElement &&
585	(document.documentElement.scrollLeft \|\| document.documentElement.scrollTop))
586	{
587	return [document.documentElement.scrollLeft, document.documentElement.scrollTop];
588	}
589	}
590
591	return [-1, -1];
592	}
593
594	/**
595	* determines the coordinates of an onclick or ondblclick event. If the coordinates to not come
596	* with the provided event, they are determined based on the surrounding object
597	*
598	* @param event the event to extract the coordinates of
599	*
600	* @returns the coordinates of the event as an array with x and y coordinate
601	*/
602	function getEventCoordinates(event) {
603	if (event.layerX) {
604	return [event.layerX, event.layerY];
605	}
606	else if (event.offsetX) {
607	return [event.offsetX, event.offsetY];
608	}
609
610	var obj = event.target \|\| event.srcElement;
611	var objOffset = getPageOffset(obj);
612
613	return [(event.clientX - objOffset[0]), (event.clientY - objOffset[1])];
614	}
615
616	/**
617	* determines the page offset of an object using the parent objects offset
618	*/
619	function getPageOffset(object) {
620	var top = 0;
621	var left = 0;
622	var obj = object;
623
624	while (obj.offsetParent) {
625	left += obj.offsetLeft;
626	top += obj.offsetTop;
627	obj = obj.offsetParent;
628	}
629
630	return [left, top];
631	}
632
633	/**
634	* generates a client id based on several information retrieved from the environment. The client
635	* id is not always unique
636	*
637	* @returns the client id
638	*/
639	function getClientId() {
640	var clientIdStr;
641	var clientId;
642	var i = 0;
643
644	if (!autoquestClientId) {
645	// create something like a more or less unique checksum.
646	clientIdStr =
647	navigator.appCodeName + navigator.appName + navigator.appVersion +
648	navigator.cookieEnabled + navigator.language + navigator.platform +
649	navigator.userAgent + navigator.javaEnabled() + window.location.protocol +
650	window.location.host + new Date().getTimezoneOffset();
651
652	clientId = clientIdStr.length;
653
654	for (i = 0; i < clientIdStr.length; i++) {
655	clientId += clientIdStr.charCodeAt(i);
656	}
657
658	autoquestClientId = clientId;
659	}
660
661	return autoquestClientId;
662	}
663
664	/**
665	* performs a simple logging by adding a specific div to the HTML
666	*
667	* @param text the text to be logged
668	*/
669	function log(text) {
670	if (autoquestDoLog) {
671	var loggingInfo = document.getElementById("loggingInfoParagraph");
672
673	if (!loggingInfo) {
674	var div = document.createElement("div");
675	div.setAttribute("style", "z-index:1000000; background-color:#afa; " +
676	"border:1px black solid; position:absolute; " +
677	"top:10px; right:10px; width:350px; height:auto");
678
679	loggingInfo = document.createElement("div");
680	loggingInfo.id = "loggingInfoParagraph";
681	div.appendChild(loggingInfo);
682
683	var body = document.getElementsByTagName("body")[0];
684	if (!body) {
685	alert("could not enable logging");
686	}
687	else {
688	body.appendChild(div);
689	}
690	}
691
692	loggingInfo.appendChild(document.createTextNode(text));
693	loggingInfo.appendChild(document.createElement("br"));
694	}
695	}
696
697	/**
698	* this class represents a single event
699	*
700	* @param type the type of the event
701	* @param nodePath the path through the HTML DOM to the event target
702	*/
703	function Event(type, nodePath) {
704	this.type = type;
705	this.nodePath = nodePath;
706	this.time = new Date().getTime();
707
708	this.setClickCoordinates = function(coordinates) {
709	this.clickCoordinates = coordinates;
710	};
711
712	this.setKey = function(key) {
713	this.key = key;
714	};
715
716	this.setSelectedValue = function(value) {
717	this.selectedValue = encodeText(value);
718	};
719
720	this.setScrollPosition = function(scrollPosition) {
721	this.scrollPosition = scrollPosition;
722	};
723
724	this.toJSON = function() {
725	var eventInJSON =
726	"{\"path\":\"" + this.nodePath + "\",\"time\":" + this.time + ",\"eventType\":\"" +
727	this.type + "\"";
728
729	if ((this.clickCoordinates) && (!isNaN(this.clickCoordinates[0]))) {
730	eventInJSON += ",\"coordinates\":[" + this.clickCoordinates + "]";
731	}
732
733	if (this.key) {
734	eventInJSON += ",\"key\":" + this.key;
735	}
736
737	if (this.selectedValue) {
738	eventInJSON += ",\"selectedValue\":\"" + this.selectedValue + "\"";
739	}
740
741	if ("onscroll" === this.type) {
742	eventInJSON += ",\"scrollPosition\":[" + this.scrollPosition + "]";
743	}
744
745	eventInJSON += "}";
746
747	return eventInJSON;
748	};
749
750	function encodeText(text) {
751	return text.replace(/\\/g, "\\\\").replace(/\"/g, "\\\"");
752	};
753	}
754

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