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source: trunk/autoquest-htmlmonitor/src/main/js/autoquest-htmlmonitor.js @ 2152

Last change on this file since 2152 was 1823, checked in by pharms, 10 years ago
extended and corrected logging, e.g., of scrolling and submitting forms using the enter key
File size: 38.6 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": [ "onclick",
75	"onkeydown",
76	"onpagehide",
77	"onpageshow",
78	"onscroll",
79	"onundo" ] },
80	{ "tag": "button", "actions": [ "onclick",
81	"onfocus" ] },
82	{ "tag": "canvas", "actions": [ "onclick" ] },
83	//{ "tag": "caption", "actions": [ ] },
84	{ "tag": "cite", "actions": [ "onclick" ] },
85	{ "tag": "code", "actions": [ "onclick" ] },
86	//{ "tag": "col", "actions": [ ] },
87	//{ "tag": "colgroup", "actions": [ ] },
88	{ "tag": "command", "actions": [ "onclick",
89	"onfocus" ] },
90	//{ "tag": "datalist", "actions": [ ] },
91	{ "tag": "dd", "actions": [ "onclick" ] },
92	{ "tag": "del", "actions": [ "onclick" ] },
93	//{ "tag": "details", "actions": [ ] },
94	{ "tag": "dfn", "actions": [ "onclick" ] },
95	{ "tag": "div", "actions": [ "onclick",
96	"onscroll" ] },
97	//{ "tag": "dl", "actions": [ ] },
98	{ "tag": "dt", "actions": [ "onclick" ] },
99	{ "tag": "em", "actions": [ "onclick" ] },
100	{ "tag": "embed", "actions": [ "onclick" ] },
101	//{ "tag": "fieldset", "actions": [ ] },
102	//{ "tag": "figcaption", "actions": [ ] },
103	//{ "tag": "figure", "actions": [ ] },
104	//{ "tag": "footer", "actions": [ ] },
105	{ "tag": "form", "actions": [ "onreset",
106	"onsubmit" ] },
107	//{ "tag": "header", "actions": [ ] },
108	//{ "tag": "hgroup", "actions": [ ] },
109	{ "tag": "h1", "actions": [ "onclick" ] },
110	{ "tag": "h2", "actions": [ "onclick" ] },
111	{ "tag": "h3", "actions": [ "onclick" ] },
112	{ "tag": "h4", "actions": [ "onclick" ] },
113	{ "tag": "h5", "actions": [ "onclick" ] },
114	{ "tag": "h6", "actions": [ "onclick" ] },
115	//{ "tag": "hr", "actions": [ ] },
116	{ "tag": "i", "actions": [ "onclick" ] },
117	//{ "tag": "iframe", "actions": [ ] },
118	{ "tag": "img", "actions": [ "onabort",
119	"onclick" ] },
120	{ "tag": "input_button", "actions": [ "onclick",
121	"onfocus" ] },
122	{ "tag": "input_checkbox", "actions": [ "onchange",
123	"onclick",
124	"onfocus" ] },
125	{ "tag": "input_color", "actions": [ "onchange",
126	"onclick",
127	"onfocus",
128	"onselect" ] },
129	{ "tag": "input_date", "actions": [ "onchange",
130	"onclick",
131	"onfocus",
132	"onselect" ] },
133	{ "tag": "input_datetime", "actions": [ "onchange",
134	"onclick",
135	"onfocus",
136	"onselect" ] },
137	{ "tag": "input_datetime-local", "actions": [ "onchange",
138	"onclick",
139	"onfocus",
140	"onselect" ] },
141	{ "tag": "input_email", "actions": [ "onchange",
142	"onclick",
143	"onfocus",
144	"onselect" ] },
145	{ "tag": "input_file", "actions": [ "onchange",
146	"onclick",
147	"onfocus",
148	"onselect" ] },
149	{ "tag": "input_image", "actions": [ "onclick",
150	"onfocus" ] },
151	{ "tag": "input_month", "actions": [ "onchange",
152	"onclick",
153	"onfocus",
154	"onselect" ] },
155	{ "tag": "input_number", "actions": [ "onchange",
156	"onclick",
157	"onfocus",
158	"onselect" ] },
159	{ "tag": "input_password", "actions": [ "onchange",
160	"onclick",
161	"onfocus" ] },
162	{ "tag": "input_radio", "actions": [ "onchange",
163	"onclick",
164	"onfocus" ] },
165	{ "tag": "input_range", "actions": [ "onchange",
166	"onclick",
167	"onfocus",
168	"onselect" ] },
169	{ "tag": "input_reset", "actions": [ "onclick",
170	"onfocus" ] },
171	{ "tag": "input_search", "actions": [ "onchange",
172	"onclick",
173	"onfocus",
174	"onselect" ] },
175	{ "tag": "input_submit", "actions": [ "onclick",
176	"onfocus" ] },
177	{ "tag": "input_tel", "actions": [ "onchange",
178	"onclick",
179	"onfocus",
180	"onselect" ] },
181	{ "tag": "input_text", "actions": [ "onchange",
182	"onclick",
183	"onfocus",
184	"onselect" ] },
185	{ "tag": "input_time", "actions": [ "onchange",
186	"onclick",
187	"onfocus",
188	"onselect" ] },
189	{ "tag": "input_url", "actions": [ "onchange",
190	"onclick",
191	"onfocus",
192	"onselect" ] },
193	{ "tag": "input_week", "actions": [ "onchange",
194	"onclick",
195	"onfocus",
196	"onselect" ] },
197	{ "tag": "input", "actions": [ "onchange",
198	"onclick",
199	"onfocus" ] },
200	{ "tag": "ins", "actions": [ "onclick" ] },
201	{ "tag": "kbd", "actions": [ "onclick" ] },
202	{ "tag": "keygen", "actions": [ "onchange",
203	"onfocus" ] },
204	//{ "tag": "label", "actions": [ ] },
205	//{ "tag": "legend", "actions": [ ] },
206	{ "tag": "li", "actions": [ "onclick" ] },
207	//{ "tag": "map", "actions": [ ] },
208	{ "tag": "mark", "actions": [ "onclick" ] },
209	{ "tag": "menu", "actions": [ "onclick" ] },
210	{ "tag": "meter", "actions": [ "onclick" ] },
211	//{ "tag": "nav", "actions": [ ] },
212	//{ "tag": "noscript", "actions": [ ] },
213	{ "tag": "object", "actions": [ "onclick" ] },
214	//{ "tag": "ol", "actions": [ ] },
215	//{ "tag": "optgroup", "actions": [ ] },
216	//{ "tag": "option", "actions": [ ] },
217	{ "tag": "output", "actions": [ "onclick" ] },
218	{ "tag": "p", "actions": [ "onclick" ] },
219	//{ "tag": "param", "actions": [ ] },
220	//{ "tag": "pre", "actions": [ ] },
221	{ "tag": "progress", "actions": [ "onclick" ] },
222	{ "tag": "q", "actions": [ "onclick" ] },
223	//{ "tag": "rp", "actions": [ ] },
224	//{ "tag": "rt", "actions": [ ] },
225	//{ "tag": "ruby", "actions": [ ] },
226	{ "tag": "s", "actions": [ "onclick" ] },
227	{ "tag": "samp", "actions": [ "onclick" ] },
228	//{ "tag": "section", "actions": [ ] },
229	{ "tag": "select", "actions": [ "onchange",
230	"onfocus",
231	"onscroll" ] },
232	{ "tag": "small", "actions": [ "onclick" ] },
233	//{ "tag": "source", "actions": [ ] },
234	{ "tag": "span", "actions": [ "onclick" ] },
235	{ "tag": "strong", "actions": [ "onclick" ] },
236	//{ "tag": "sub", "actions": [ ] },
237	//{ "tag": "summary", "actions": [ ] },
238	//{ "tag": "sup", "actions": [ ] },
239	//{ "tag": "table", "actions": [ ] },
240	//{ "tag": "tbody", "actions": [ ] },
241	{ "tag": "td", "actions": [ "onclick" ] },
242	{ "tag": "textarea", "actions": [ "onchange",
243	"onfocus",
244	"onselect",
245	"onscroll" ] },
246	//{ "tag": "tfoot", "actions": [ ] },
247	{ "tag": "th", "actions": [ "onclick" ] },
248	//{ "tag": "thead", "actions": [ ] },
249	{ "tag": "time", "actions": [ "onclick" ] },
250	//{ "tag": "tr", "actions": [ ] },
251	//{ "tag": "track", "actions": [ ] },
252	{ "tag": "u", "actions": [ "onclick" ] },
253	//{ "tag": "ul", "actions": [ ] },
254	{ "tag": "var", "actions": [ "onclick" ] },
255	{ "tag": "video", "actions": [ "onplaying",
256	"onpause",
257	"ontimeupdate" ] }
258	//{ "tag": "wbr", "actions": [ ] },
259	];
260
261	/**
262	* a possibility to trace, what is going on
263	*/
264	var autoquestDoLog = false;
265
266	/**
267	* stores the structure of the GUI of the current page
268	*/
269	var autoquestGUIModel;
270
271	/**
272	* stores events, which were recorded but not sent to the server yet
273	*/
274	var autoquestRecordedEvents = [];
275
276	/**
277	* stores the interval for sending data of inactive browser windows
278	*/
279	var autoquestSendInterval;
280
281	/**
282	* automatically executed to initialize the event handling
283	*/
284	(function() {
285	initEventHandling();
286	}());
287
288
289	/**
290	* initializes the event handling after the document is loaded completely
291	*/
292	function initEventHandling() {
293	if (document.body) {
294	if (document.readyState !== "complete") {
295	// if the document is not loaded yet, try to add further event handling later
296	setTimeout(initEventHandling, 200);
297	}
298	else if (!autoquestSendInterval) {
299	log("adding event handling attributes");
300	determineDestination();
301	autoquestGUIModel =
302	addEventHandlingAndGetJSONRepresentation(document.documentElement, "");
303
304	addDefaultEventHandling();
305
306	// the onload event is already fired and lost. So pretend it to happen.
307	handleEvent(document.getElementsByTagName("body").item(0), "onload",
308	"/html[0]/body[0]", null);
309
310	// recall sending data each 100 seconds to ensure, that for browser windows staying
311	// open the data will be send, as well.
312	autoquestSendInterval = setTimeout(sendRequest, 100000);
313	}
314	}
315	else {
316	setTimeout(initEventHandling, 200);
317	}
318	}
319
320	/**
321	* traverses the DOM-structure of the HTML-site and determines the URL of this script. Based on
322	* this URL, it calculates the destination to which the traced interactions must be sent
323	*/
324	function determineDestination() {
325	var scriptElements = document.getElementsByTagName("script");
326	var i;
327	var index;
328
329	for (i = 0; i < scriptElements.length; i++) {
330	if ((scriptElements[i].type === "text/javascript") && (scriptElements[i].src)) {
331	index = scriptElements[i].src.lastIndexOf("script/autoquest-htmlmonitor.js");
332	if (index > -1) {
333	autoquestDestination = scriptElements[i].src.substring(0, index - 1);
334	log("using destination " + autoquestDestination);
335	}
336	}
337	}
338	}
339
340	/**
341	* traverses the DOM-structure of the HTML-site and adds event handling attributes to each
342	* relevant node. Furthermore returns a JSON representation of the node including the children
343	*
344	* @param node the node of the DOM structure that shall be adapted and whose children shall
345	* be traversed
346	* @param parentPath the path to the parent node of the provided node within the DOM-structure of
347	* the HTML-site
348	*/
349	function addEventHandlingAndGetJSONRepresentation(node, parentPath) {
350	var nodePath;
351	var i;
352	var jsonRepresentation = null;
353	var childRepresentation;
354	var childRepresentations = null;
355
356	if (node.nodeType === Node.ELEMENT_NODE) {
357	jsonRepresentation = "{\"tagName\":\"" + getTagName(node) + "\",";
358
359	if ((node.id) && (node.id !== "")) {
360	jsonRepresentation += "\"htmlId\":\"" + node.id + "\"";
361	}
362	else {
363	jsonRepresentation += "\"index\":\"" + getNodeIndex(node) + "\"";
364	}
365
366	addEventHandling(node, parentPath);
367
368	if (node.childNodes.length > 0) {
369	nodePath = getNodePath(node, parentPath);
370
371	for (i = 0; i < node.childNodes.length; i++) {
372	childRepresentation =
373	addEventHandlingAndGetJSONRepresentation(node.childNodes[i], nodePath);
374
375	if (childRepresentation) {
376	if (!childRepresentations) {
377	childRepresentations = childRepresentation;
378	}
379	else {
380	childRepresentations += "," + childRepresentation;
381	}
382	}
383	}
384
385	if (childRepresentations) {
386	jsonRepresentation += ",\"children\":[" + childRepresentations + "]";
387	}
388	}
389
390	jsonRepresentation += "}";
391	}
392
393	return jsonRepresentation;
394	}
395
396	/**
397	* adds event handling functionality to the provided node. Calls
398	* {@link #addEventHandlingWithJQuery(node,parentPath)} or
399	* {@link #addEventHandlingWithoutJQuery(node,parentPath)} depending on the fact if jQuery is
400	* available and must therefore be used, or not.
401	*
402	* @param node the node of the DOM structure that shall be equipped with event handling
403	* @param parentPath the path to the parent node of the provided node within the DOM-structure of
404	* the HTML-site
405	*/
406	function addEventHandling(node, parentPath) {
407	if (typeof jQuery === 'undefined') {
408	addEventHandlingWithoutJQuery(node, parentPath);
409	}
410	else {
411	addEventHandlingWithJQuery(node, parentPath);
412	}
413	}
414
415	/**
416	* adds event handling functionality to the provided node using onxxx attributes
417	*
418	* @param node the node of the DOM structure that shall be equipped with event handling
419	* @param parentPath the path to the parent node of the provided node within the DOM-structure of
420	* the HTML-site
421	*/
422	function addEventHandlingWithoutJQuery(node, parentPath) {
423	var nodePath = getNodePath(node, parentPath);
424	var tagName = getTagName(node);
425	var i;
426	var k;
427
428	for (i = 0; i < autoquestActionConfig.length; i++) {
429	if (tagName === autoquestActionConfig[i].tag.toLowerCase()) {
430	for (k = 0; k < autoquestActionConfig[i].actions.length; k++) {
431	adaptEventHandlingAttribute(node, nodePath, autoquestActionConfig[i].actions[k]);
432	}
433	}
434	}
435	}
436
437	/**
438	* adds event handling functionality to the provided node using jQuery attributes. If the node
439	* already used onxxx attributes, these are extended instead of using jQuery.
440	*
441	* @param node the node of the DOM structure that shall be equipped with event handling
442	* @param parentPath the path to the parent node of the provided node within the DOM-structure of
443	* the HTML-site
444	*/
445	function addEventHandlingWithJQuery(node, parentPath) {
446	var nodePath = getNodePath(node, parentPath);
447	var tagName = getTagName(node);
448	var action;
449	var i;
450	var k;
451
452	for (i = 0; i < autoquestActionConfig.length; i++) {
453	if (tagName === autoquestActionConfig[i].tag.toLowerCase()) {
454	for (k = 0; k < autoquestActionConfig[i].actions.length; k++) {
455	action = autoquestActionConfig[i].actions[k];
456	if (jQuery(node).attr(action)) {
457	// if there is an event handling attribute although jquery is present
458	// edit this attribute accordingly
459	adaptEventHandlingAttribute(node, nodePath, action);
460	}
461	else {
462	registerEventHandler(node, nodePath, action);
463	}
464	}
465	}
466	}
467	}
468
469	/**
470	* adapts the event handling attributed provided by the action parameter so that it calls
471	* the {@link #handleEvent(node, action, path, event)} function in the case the event occurs.
472	* Either the method creates an appropriate onxxx attribute on the node if there is none, or it
473	* adds a call to the function as first thing called by the onxxx attribute.
474	*
475	* @param node the node of the DOM structure that shall be equipped with event handling
476	* @param nodePath the path to the node within the DOM-structure of the HTML-site
477	* @param action the event for which event handling shall be enabled
478	*/
479	function adaptEventHandlingAttribute(node, nodePath, action) {
480	var value = "handleEvent(this, '" + action + "', '" + nodePath + "', event);";
481	var oldValue;
482
483	if (!node.getAttribute(action)) {
484	node.setAttribute(action, value);
485	}
486	else {
487	oldValue = node.getAttribute(action);
488	if (oldValue.indexOf(value) < 0) {
489	node.setAttribute(action, value + ' ' + oldValue);
490	}
491	}
492	}
493
494	/**
495	* registers an event handler using jQuery for the provided action on the given object so that it
496	* calls the {@link #handleJQueryEvent(event)} function in the case the event occurs.
497	*
498	* @param node the node of the DOM structure that shall be equipped with event handling
499	* @param nodePath the path to the node within the DOM-structure of the HTML-site
500	* @param action the event for which event handling shall be enabled
501	*/
502	function registerEventHandler(node, nodePath, action) {
503	var parameters = { action : action, path : nodePath};
504
505	if ((action === "onscroll") && (node === document.body)) {
506	node = window;
507	}
508
509	if (jQuery(node).on) {
510	jQuery(node).on(action.substring(2), parameters, handleJQueryEvent);
511	}
512	else {
513	jQuery(node).bind(action.substring(2), parameters, handleJQueryEvent);
514	}
515	}
516
517	/**
518	* adds default event handling functionality for receiving load, unload, and other document
519	* relevant events. The registration for events is done depending on the availability of jQuery.
520	* If jQuery is available and must therefore be used, then the registration is done on the window
521	* object. Otherwise, the appropriate attributes of the document's body tag are changed
522	*/
523	function addDefaultEventHandling() {
524	var body;
525
526	if (typeof jQuery === 'undefined') {
527	body = document.getElementsByTagName("body").item(0);
528	adaptEventHandlingAttribute(body, "/html[0]/body[0]", "onbeforeunload");
529	adaptEventHandlingAttribute(body, "/html[0]/body[0]", "onload");
530	adaptEventHandlingAttribute(body, "/html[0]/body[0]", "onunload");
531	//adaptEventHandlingAttribute(body, "/html[0]/body[0]", "onerror");
532	}
533	else {
534	registerEventHandler(window, "/html[0]/body[0]", "onbeforeunload");
535	registerEventHandler(window, "/html[0]/body[0]", "onload");
536	registerEventHandler(window, "/html[0]/body[0]", "onunload");
537	//registerEventHandler(body, "/html[0]/body[0]", "onerror");
538	}
539	}
540
541	/**
542	* generates a path through the DOM-structure of the HTML-site depending on a node and the path
543	* to its parent node. The result is the parent path plus a path element for the provided node.
544	* The first part of the path element generated for the node is the tag name returned by
545	* {@link #getTagName(node)}. If the node has an id, it becomes the second part of the path
546	* element. If the node does not have an id, the method calculates the index of the node within
547	* all children of the same type within the parent node. This index becomes then the second part
548	* of the path element generated for the node.
549	*
550	* @param node the node of the DOM structure for which the path shall be created
551	* @param parentPath the path to the parent node of the provided node
552	*
553	* @returns a path in the DOM-structure of the HTML-site including the parent path an a path
554	* element for the provided node
555	*/
556	function getNodePath(node, parentPath) {
557	var nodePath = parentPath + "/" + getTagName(node);
558
559	if ((node.id) && (node.id !== "")) {
560	nodePath += "(htmlId=" + node.id + ")";
561	}
562	else {
563	nodePath += "[" + getNodeIndex(node) + "]";
564	}
565
566	return nodePath;
567	}
568
569	/**
570	* called to handle events caused by the jQuery event handling mechanism. Forwards the event to
571	* {@link #handleEvent(node, eventName, nodePath, event)}
572	*
573	* @param the event to be handled
574	*/
575	function handleJQueryEvent(event) {
576	handleEvent(this, event.data.action, event.data.path, event);
577	}
578
579	/**
580	* handles an event that happened on a node. This method is called by the event handling attributes
581	* of the nodes. These attributes are generated by the
582	* {@link #addEventHandlingAttributes(node,parentPath)} function. It creates a new Event object and
583	* adds it to the list of <code>autoquestRecordedEvents</code>. If this list achieves the maximum
584	* <code>autoquestPackageSize</code> the events in the list are sent to the server asynchronously
585	* through calling {@link #sendRequest()}.
586	*
587	* @param node the node that fired the event
588	* @param eventName the name of the event, e.g. onscroll
589	* @param nodePath the path to the node in the HTML DOM on which the event occurred
590	* @param event the HTML event that occured
591	*/
592	function handleEvent(node, eventName, nodePath, event) {
593	var eventType;
594	var eventObj = null;
595	var preceedingScrollEventObj = null;
596	var tagName;
597	var unmonitored;
598	var x1, x2;
599	var y1, y2;
600
601	if (!autoquestDestination) {
602	// do nothing if we have no destination to send data to
603	return;
604	}
605
606	log("handling event " + eventName + " on " + node);
607
608	eventType = eventName.toLowerCase();
609
610	// filter onkeydown events, which are not of interest
611	if ((eventType === "onkeydown") && (node === document.body)) {
612	// do not handle key downs on the body which are other than tabs (keycode 9)
613	if ((event.keyCode !== 9) && (event.keyCode !== 13)) {
614	return;
615	}
616	}
617
618	// check, if the preceeding event is more concrete, i.e. the new event to be handled is only
619	// a propagation through the DOM and needs, therefore, not be handled
620	if (autoquestRecordedEvents.length > 0) {
621	eventObj = autoquestRecordedEvents[autoquestRecordedEvents.length - 1];
622
623	if ((eventObj.type === eventType) && (eventObj.nodePath.indexOf(nodePath) === 0)) {
624	// the event is of the same type.
625	if (eventObj.nodePath.length > nodePath.length) {
626	// the new event is the same event as the previous one, but fired for the parent
627	// GUI element of the previous event. This must not be handled. So ignore it
628	log("discarding event " + eventName + " on " + node +
629	" as it is already handled by a child");
630	return;
631	}
632	else if (eventType !== "onscroll") {
633	// we have the same event on the same element. If it is an onscroll, we may
634	// reuse it. But it is not an onscroll. So we ignore the existing event.
635	eventObj = null;
636	}
637	else {
638	// we have a repeated onscroll. Check, if the scrolling direction can be determined
639	// and if it changed. If so created a new object. If not, stick to the existing one.
640	if (autoquestRecordedEvents.length > 1) {
641	preceedingScrollEventObj =
642	autoquestRecordedEvents[autoquestRecordedEvents.length - 2];
643
644	if (preceedingScrollEventObj.type !== eventType) {
645	preceedingScrollEventObj = null;
646	}
647	}
648
649	if (preceedingScrollEventObj != null) {
650	x1 = preceedingScrollEventObj.scrollPosition[0] - eventObj.scrollPosition[0];
651	x2 = eventObj.scrollPosition[0] - getScrollCoordinates(node)[0];
652	y1 = preceedingScrollEventObj.scrollPosition[1] - eventObj.scrollPosition[1];
653	y2 = eventObj.scrollPosition[1] - getScrollCoordinates(node)[1];
654
655	if ((((x1 >= 0) && (x2 >= 0)) \|\| ((x1 <= 0) && (x2 <= 0))) &&
656	(((y1 >= 0) && (y2 >= 0)) \|\| ((y1 <= 0) && (y2 <= 0))))
657	{
658	// The new scrolling is a continuation of the previous scrolling --> reuse
659	// previous object
660	}
661	else {
662	eventObj = null;
663	}
664	}
665	else {
666	// we cannot determine the preceeding scroll direction, so we have to store the
667	// new event
668	eventObj = null;
669	}
670	}
671	}
672	else {
673	// the event is not of an equal type as the previous one. So we will not reuse it
674	eventObj = null;
675	}
676	}
677
678	if (!eventObj) {
679	// we can not reuse the previous event. So create a new event and add it to the list
680	eventObj = new Event(eventType, nodePath);
681	log("storing event " + eventName);
682	autoquestRecordedEvents.push(eventObj);
683	}
684
685	// now add further event parameters
686	if ((eventType === "onclick") \|\| (eventType === "ondblclick")) {
687	eventObj.setClickCoordinates(getEventCoordinates(event));
688	}
689
690	tagName = getTagName(node);
691
692	// ensure to not monitor details for GUI elements marked as unmonitored
693	if (node.getAttribute && node.getAttribute("class")) {
694	unmonitored = node.getAttribute("class").indexOf("autoquest-unmonitored") >= 0;
695	}
696	else {
697	unmonitored = false;
698	}
699
700	if (!unmonitored && ("input_password" !== tagName)) {
701	// add further parameters for GUI elements which are monitored and which are no password
702	// fields
703	if ((eventType === "onkeypress") \|\|
704	(eventType === "onkeydown") \|\|
705	(eventType === "onkeyup"))
706	{
707	eventObj.setKey(event.keyCode);
708	}
709	else if (eventType === "onchange") {
710	if ((tagName.indexOf("input") === 0) \|\|
711	(tagName === "textarea") \|\|
712	(tagName === "keygen"))
713	{
714	eventObj.setSelectedValue(node.value);
715	}
716	else if (tagName === "select") {
717	eventObj.setSelectedValue(node.options.item(node.options.selectedIndex));
718	}
719	}
720	}
721
722	if (eventType === "onscroll") {
723	eventObj.setScrollPosition(getScrollCoordinates(node));
724	}
725
726	// finally send the recorded data
727	if (autoquestRecordedEvents.length >= autoquestPackageSize) {
728	log("initiating sending events");
729	setTimeout(sendRequest, 100);
730	}
731	else if ((eventType === "onunload") \|\| (eventType === "onbeforeunload")) {
732	log("initiating sending events");
733	sendRequest();
734	}
735
736	}
737
738	/**
739	* determines a tag name of a node. If the node is an input element, the tag name includes the
740	* type of element. Otherwise the method simply returns the tag name.
741	*
742	* @param node the node for which the name must be determined
743	*
744	* @return the name as described
745	*/
746	function getTagName(node) {
747	var tagName = null;
748
749	if (node.tagName) {
750	tagName = node.tagName.toLowerCase();
751	if ("input" === tagName) {
752	if (node.type && (node.type !== "")) {
753	tagName += "_" + node.type;
754	}
755	else {
756	tagName += "_text";
757	}
758	}
759	}
760
761	return tagName;
762	}
763
764	/**
765	* determines the index of a node considering all nodes of the parent having the same name. If the
766	* node has no parent, the method returns index 0.
767	*
768	* @param node the node for which the index must be determined
769	*
770	* @return the index as described
771	*/
772	function getNodeIndex(node) {
773	var i;
774	var index = 0;
775
776	if (node.parentNode) {
777	for (i = 0; i < node.parentNode.childNodes.length; i++) {
778	if (node.parentNode.childNodes[i].tagName === node.tagName) {
779	// if === also returns true if the nodes are not identical but only equal,
780	// this may fail.
781	if (node.parentNode.childNodes[i] === node) {
782	break;
783	}
784	index++;
785	}
786	}
787
788	}
789
790	return index;
791	}
792
793	/**
794	* sends the collected data to the server, named in the destination-variable. For this it generates
795	* a JSON formatted message and uses Ajax and the <code>autoquestDestination</code> to send it to
796	* the server
797	*/
798	function sendRequest() {
799	var eventList = autoquestRecordedEvents;
800	var message;
801	var clientId;
802	var i = 0;
803	var request;
804
805	if (eventList.length > 1) {
806	log("creating message");
807
808	// put the last event into the new list to allow for checks for reoccurence of the same
809	// event
810	autoquestRecordedEvents = [ eventList.pop() ];
811
812	message = "{\"message\":{\"clientInfos\":{";
813
814	log("reading client id");
815	clientId = getClientId();
816	if ((clientId) && (clientId !== "")) {
817	message += "\"clientId\":\"" + clientId + "\",";
818	}
819
820	log("adding other infos");
821	message += "\"userAgent\":\"" + navigator.userAgent + "\",";
822	message += "\"title\":\"" + document.title + "\",";
823	message += "\"url\":\"" + document.URL + "\"},";
824
825	message += "\"guiModel\":" + autoquestGUIModel + ",";
826
827	message += "\"events\":[";
828
829	for (i = 0; i < eventList.length; i++) {
830	if (i > 0) {
831	message += ",";
832	}
833	message += eventList[i].toJSON();
834	}
835
836	message += "]}}";
837
838	request = null;
839
840	// Mozilla
841	if (window.XMLHttpRequest) {
842	request = new XMLHttpRequest();
843	}
844	// IE
845	else if (window.ActiveXObject) {
846	request = new ActiveXObject("Microsoft.XMLHTTP");
847	}
848
849	request.open("POST", autoquestDestination, false);
850	request.setRequestHeader("Content-Type", "application/json");
851
852	log("sending " + message);
853	request.send(message);
854	}
855	}
856
857	/**
858	* determines the scroll coordinates of the scrolled element
859	*
860	* @param node the element that was scrolled
861	*
862	* @returns the coordinates of the scrolling as an array with x and y coordinate
863	*/
864	function getScrollCoordinates(node) {
865	if (typeof node.scrollLeft !== 'undefined') {
866	return [node.scrollLeft, node.scrollTop];
867	}
868	else if ((node === window) && (typeof window.pageXOffset !== 'undefined')) {
869	return [window.pageXOffset, window.pageYOffset];
870	}
871	else if ((node === document) \|\| (node === document.body) \|\|
872	(node === document.documentElement))
873	{
874	if ((typeof document.body !== 'undefined') &&
875	(typeof document.body.scrollLeft !== 'undefined'))
876	{
877	return [document.body.scrollLeft, document.body.scrollTop];
878	}
879	else if ((typeof document.documentElement !== 'undefined') &&
880	(typeof document.documentElement.scrollLeft !== 'undefined'))
881	{
882	return [document.documentElement.scrollLeft, document.documentElement.scrollTop];
883	}
884	}
885
886	return [-1, -1];
887	}
888
889	/**
890	* determines the coordinates of an onclick or ondblclick event. If the coordinates to not come
891	* with the provided event, they are determined based on the surrounding object
892	*
893	* @param event the event to extract the coordinates of
894	*
895	* @returns the coordinates of the event as an array with x and y coordinate
896	*/
897	function getEventCoordinates(event) {
898	if (event.layerX) {
899	return [event.layerX, event.layerY];
900	}
901	else if (event.offsetX) {
902	return [event.offsetX, event.offsetY];
903	}
904
905	var obj = event.target \|\| event.srcElement;
906	var objOffset = getPageOffset(obj);
907
908	return [(event.clientX - objOffset[0]), (event.clientY - objOffset[1])];
909	}
910
911	/**
912	* determines the page offset of an object using the parent objects offset
913	*/
914	function getPageOffset(object) {
915	var top = 0;
916	var left = 0;
917	var obj = object;
918
919	while (obj.offsetParent) {
920	left += obj.offsetLeft;
921	top += obj.offsetTop;
922	obj = obj.offsetParent;
923	}
924
925	return [left, top];
926	}
927
928	/**
929	* generates a client id based on several information retrieved from the environment. The client
930	* id is not always unique
931	*
932	* @returns the client id
933	*/
934	function getClientId() {
935	var clientIdStr;
936	var clientId;
937	var i = 0;
938
939	if (!autoquestClientId) {
940	// create something like a more or less unique checksum.
941	clientIdStr =
942	navigator.appCodeName + navigator.appName + navigator.appVersion +
943	navigator.cookieEnabled + navigator.language + navigator.platform +
944	navigator.userAgent + navigator.javaEnabled() + window.location.protocol +
945	window.location.host + new Date().getTimezoneOffset();
946
947	clientId = clientIdStr.length;
948
949	for (i = 0; i < clientIdStr.length; i++) {
950	clientId += clientIdStr.charCodeAt(i);
951	}
952
953	autoquestClientId = clientId;
954	}
955
956	return autoquestClientId;
957	}
958
959	/**
960	* performs a simple logging by adding a specific div to the HTML
961	*
962	* @param text the text to be logged
963	*/
964	function log(text) {
965	if (autoquestDoLog) {
966	var loggingInfo = document.getElementById("loggingInfoParagraph");
967
968	if (!loggingInfo) {
969	var div = document.createElement("div");
970	div.setAttribute("style", "z-index:1000000; background-color:#afa; " +
971	"border:1px black solid; position:absolute; top:10px; right:10px; " +
972	"width:350px; height:auto; font-size:8pt; font-family:Helvetica");
973
974	loggingInfo = document.createElement("div");
975	loggingInfo.id = "loggingInfoParagraph";
976	div.appendChild(loggingInfo);
977
978	var body = document.getElementsByTagName("body")[0];
979	if (!body) {
980	alert("could not enable logging");
981	}
982	else {
983	body.appendChild(div);
984	}
985	}
986
987	loggingInfo.appendChild(document.createTextNode(text));
988	loggingInfo.appendChild(document.createElement("br"));
989	}
990	}
991
992	/**
993	* this class represents a single event
994	*
995	* @param type the type of the event
996	* @param nodePath the path through the HTML DOM to the event target
997	*/
998	function Event(type, nodePath) {
999	this.type = type;
1000	this.nodePath = nodePath;
1001	this.time = new Date().getTime();
1002
1003	this.setClickCoordinates = function(coordinates) {
1004	this.clickCoordinates = coordinates;
1005	};
1006
1007	this.setKey = function(key) {
1008	this.key = key;
1009	};
1010
1011	this.setSelectedValue = function(value) {
1012	this.selectedValue = encodeText(value);
1013	};
1014
1015	this.setScrollPosition = function(scrollPosition) {
1016	this.scrollPosition = scrollPosition;
1017	};
1018
1019	this.toJSON = function() {
1020	var eventInJSON =
1021	"{\"path\":\"" + this.nodePath + "\",\"time\":" + this.time + ",\"eventType\":\"" +
1022	this.type + "\"";
1023
1024	if ((this.clickCoordinates) && (!isNaN(this.clickCoordinates[0]))) {
1025	eventInJSON += ",\"coordinates\":[" + this.clickCoordinates + "]";
1026	}
1027
1028	if (this.key) {
1029	eventInJSON += ",\"key\":" + this.key;
1030	}
1031
1032	if (this.selectedValue) {
1033	eventInJSON += ",\"selectedValue\":\"" + this.selectedValue + "\"";
1034	}
1035
1036	if ("onscroll" === this.type) {
1037	eventInJSON += ",\"scrollPosition\":[" + this.scrollPosition + "]";
1038	}
1039
1040	eventInJSON += "}";
1041
1042	return eventInJSON;
1043	};
1044
1045	function encodeText(text) {
1046	return text.replace(/\\/g, "\\\\").replace(/\"/g, "\\\"");
1047	};
1048	}

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