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57          </dt>
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59            Undocumented.
60          </dd>
61          <dd>
62            Description of this parameter from the json schema.
63          </dd>
64          <dd>
65            This parameter was added in version
66            <b><span></span></b>.
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253      <div id="pageTitle">
254        <h1 class="page_title">Tutorial: Google Analytics</h1>
255      </div>
256        <!-- TABLE OF CONTENTS -->
257        <div id="toc">
258          <h2>Contents</h2>
259          <ol>
260            <li>
261              <a href="#toc-requirements">Requirements</a>
262              <ol>
263                <li style="display: none; ">
264                  <a>h3Name</a>
265                </li>
266              </ol>
267            </li><li>
268              <a href="#toc-installing">Installing the tracking code</a>
269              <ol>
270                <li style="display: none; ">
271                  <a>h3Name</a>
272                </li>
273              </ol>
274            </li><li>
275              <a href="#toc-tracking-pageviews">Tracking page views</a>
276              <ol>
277                <li style="display: none; ">
278                  <a>h3Name</a>
279                </li>
280              </ol>
281            </li><li>
282              <a href="#toc-debugging">Monitoring analytics requests</a>
283              <ol>
284                <li style="display: none; ">
285                  <a>h3Name</a>
286                </li>
287              </ol>
288            </li><li>
289              <a href="#toc-tracking-events">Tracking events</a>
290              <ol>
291                <li style="display: none; ">
292                  <a>h3Name</a>
293                </li>
294              </ol>
295            </li><li>
296              <a href="#toc-samplecode">Sample code</a>
297              <ol>
298                <li style="display: none; ">
299                  <a>h3Name</a>
300                </li>
301              </ol>
302            </li>
303              <li style="display: none; ">
304                <a href="#apiReference">API reference</a>
305                <ol>
306                  <li>
307                    <a href="#properties">Properties</a>
308                    <ol>
309                      <li>
310                        <a href="#property-anchor">propertyName</a>
311                      </li>
312                    </ol>
313                  </li>
314                  <li>
315                    <a>Methods</a>
316                    <ol>
317                      <li>
318                        <a href="#method-anchor">methodName</a>
319                      </li>
320                    </ol>
321                  </li>
322                  <li>
323                    <a>Events</a>
324                    <ol>
325                      <li>
326                        <a href="#event-anchor">eventName</a>
327                      </li>
328                    </ol>
329                  </li>
330                  <li>
331                    <a href="#types">Types</a>
332                    <ol>
333                      <li>
334                        <a href="#id-anchor">id</a>
335                      </li>
336                    </ol>
337                  </li>
338                </ol>
339              </li>
340          </ol>
341        </div>
342        <!-- /TABLE OF CONTENTS -->
343
344        <!-- Standard content lead-in for experimental API pages -->
345        <p id="classSummary" style="display: none; ">
346          For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page.
347        </p>
348
349        <!-- STATIC CONTENT PLACEHOLDER -->
350        <div id="static"><div id="pageData-name" class="pageData">Tutorial: Google Analytics</div>
351<div id="pageData-showTOC" class="pageData">true</div>
352
353<p>This tutorial demonstrates using Google Analytics to track the usage of your
354extension.</p>
355
356<h2 id="toc-requirements">Requirements</h2>
357<p>
358  This tutorial expects that you have some familiarity writing extensions for
359  Google Chrome.  If you need information on how to write an extension, please
360  read the <a href="gettingstarted.html">Getting Started tutorial</a>.
361</p>
362
363<p>
364  You will also need a <a href="http://www.google.com/analytics">Google
365  Analytics account</a> set up to track your extension.  Note that when setting
366  up the account, you can use any value in the Website's URL field, as your
367  extension will not have an URL of its own.
368</p>
369
370<p style="text-align: center">
371  <img src="images/tut_analytics/screenshot01.png" style="width:400px;height:82px;" alt="The analytics setup with info for a chrome extension filled out.">
372</p>
373
374<p>
375  Also note that Google Analytics requires version <strong>4.0.302.2</strong>
376  of Google Chrome to work correctly.  Users with an earlier version of Google
377  Chrome will not show up on your Google Analytics reports.  View
378  <a href="faq.html#faq-dev-14">this FAQ entry</a> to learn how to check which
379  version of Google Chrome is deployed to which platform.
380</p>
381
382<h2 id="toc-installing">Installing the tracking code</h2>
383
384<p>
385  The standard Google Analytics tracking code snippet fetches a file named
386  <code>ga.js</code> from an SSL protected URL if the current page
387  was loaded using the <code>https://</code> protocol.  <strong>It is strongly
388  advised to use the SSL protected ga.js in an extension</strong>,
389  but Google Chrome extension
390  pages are hosted under <code>chrome-extension://</code> URLs, so the tracking
391  snippet must be modified slightly to pull <code>ga.js</code> directly from
392  <code>https://ssl.google-analytics.com/ga.js</code> instead of the default
393  location.
394</p>
395
396<p>
397  Below is a modified snippet for the
398  <a href="http://code.google.com/apis/analytics/docs/tracking/asyncTracking.html">asynchronous
399  tracking API</a> (the modified line is bolded):
400</p>
401
402<pre>(function() {
403  var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
404  <strong>ga.src = 'https://ssl.google-analytics.com/ga.js';</strong>
405  var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
406})();
407</pre>
408
409<p>
410  Here is a background page which loads the asynchronous tracking code and
411  tracks a single page view:
412</p>
413
414<pre>&lt;!DOCTYPE html&gt;
415&lt;html&gt;
416 &lt;head&gt;
417   ...
418 &lt;/head&gt;
419 &lt;body&gt;
420   &lt;script&gt;
421     var _gaq = _gaq || [];
422     _gaq.push(['_setAccount', 'UA-XXXXXXXX-X']);
423     _gaq.push(['_trackPageview']);
424
425     (function() {
426       var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
427       ga.src = 'https://ssl.google-analytics.com/ga.js';
428       var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
429     })();
430   &lt;/script&gt;
431
432   ...
433 &lt;/body&gt;
434&lt;/html&gt;
435</pre>
436
437<p>
438  Keep in mind that the string <code>UA-XXXXXXXX-X</code> should be replaced
439  with your own Google Analytics account number.
440</p>
441
442<h2 id="toc-tracking-pageviews">Tracking page views</h2>
443
444<p>
445  The <code>_gaq.push(['_trackPageview']);</code> code will track a single
446  page view.  This code may be used on any page in your extension.  When
447  placed on a background page, it will register a view once per browser
448  session.  When placed on a popup, it will register a view once every time
449  the popup is opened.
450</p>
451
452<p>
453  By looking at the page view data for each page in your extension, you can
454  get an idea of how many times your users interact with your extension per
455  browser session:
456</p>
457
458<p style="text-align: center">
459  <img src="images/tut_analytics/screenshot02.png" style="width:300px;height:119px;" alt="Analytics view of the top content for a site.">
460</p>
461
462<h2 id="toc-debugging">Monitoring analytics requests</h2>
463
464<p>
465  To ensure that tracking data from your extension is being sent to Google
466  Analytics, you can inspect the pages of your extension in the
467  Developer Tools window (see the
468  <a href="tut_debugging.html">debugging tutorial</a> for more information).
469  As the following figure shows, you should see requests for a file named
470  <strong>__utm.gif</strong> if everything is set up correctly.
471</p>
472
473<p style="text-align: center">
474  <img src="images/tut_analytics/screenshot04.png" style="width:683px;height:418px;" alt="Developer Tools window showing the __utm.gif request">
475</p>
476
477<h2 id="toc-tracking-events">Tracking events</h2>
478
479<p>
480  By configuring event tracking, you can determine which parts of your
481  extension your users interact with the most.  For example, if you have
482  three buttons users may click:
483</p>
484
485<pre>  &lt;button&gt;Button 1&lt;/button&gt;
486  &lt;button&gt;Button 2&lt;/button&gt;
487  &lt;button&gt;Button 3&lt;/button&gt;
488</pre>
489
490<p>
491  Write a function that sends click events to Google Analytics:
492</p>
493
494<pre>  function trackButton(button_id) {
495    _gaq.push(['_trackEvent', 'button' + button_id, 'clicked']);
496  };
497</pre>
498
499<p>
500  And call it when each button is pressed:
501</p>
502
503<pre>  &lt;button onclick="trackButton(1);"&gt;Button 1&lt;/button&gt;
504  &lt;button onclick="trackButton(2);"&gt;Button 2&lt;/button&gt;
505  &lt;button onclick="trackButton(3);"&gt;Button 3&lt;/button&gt;
506</pre>
507
508<p>
509  The Google Analytics event tracking overview page will give you metrics
510  regarding how many times each individual button is clicked:
511</p>
512
513<p style="text-align: center">
514  <img src="images/tut_analytics/screenshot03.png" style="width:300px;height:482px;" alt="Analytics view of the event tracking data for a site.">
515</p>
516
517<p>
518  By using this approach, you can see which parts of your extension are
519  under-or-overutilized.  This information can help guide decisions about UI
520  redesigns or additional functionality to implement.
521</p>
522
523<p>
524  For more information about using the event tracking API, see the
525  Google Analytics
526  <a href="http://code.google.com/apis/analytics/docs/tracking/eventTrackerOverview.html">developer
527  documentation</a>.
528</p>
529
530<h2 id="toc-samplecode">Sample code</h2>
531
532<p>
533  A sample extension that uses these techniques is
534  available in the Chromium source tree:
535</p>
536
537<blockquote>
538  <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/tutorials/analytics/">.../examples/tutorials/analytics/</a>
539</blockquote>
540<p></p>
541</div>
542
543        <!-- API PAGE -->
544        <div class="apiPage" style="display: none; ">
545        <a name="apiReference"></a>
546        <h2>API reference: chrome.apiname </h2>
547
548          <!-- PROPERTIES -->
549          <div class="apiGroup">
550            <a name="properties"></a>
551            <h3 id="properties">Properties</h3>
552
553            <div>
554              <a></a>
555              <h4>getLastError</h4>
556              <div class="summary">
557                <!-- Note: intentionally longer 80 columns -->
558                <span>chrome.extension</span><span>lastError</span>
559              </div>
560              <div>
561              </div>
562            </div>
563
564          </div> <!-- /apiGroup -->
565
566          <!-- METHODS -->
567          <div id="methodsTemplate" class="apiGroup">
568            <a></a>
569            <h3>Methods</h3>
570
571            <!-- iterates over all functions -->
572            <div class="apiItem">
573              <a></a> <!-- method-anchor -->
574              <h4>method name</h4>
575
576              <div class="summary"><span>void</span>
577                  <!-- Note: intentionally longer 80 columns -->
578                  <span>chrome.module.methodName</span>(<span><span>, </span><span></span>
579                      <var><span></span></var></span>)</div>
580
581              <div class="description">
582                <p class="todo">Undocumented.</p>
583                <p>
584                  A description from the json schema def of the function goes here.
585                </p>
586
587                <!-- PARAMETERS -->
588                <h4>Parameters</h4>
589                <dl>
590                  <div>
591                    <div>
592                    </div>
593                  </div>
594                </dl>
595
596                <!-- RETURNS -->
597                <h4>Returns</h4>
598                <dl>
599                  <div>
600                    <div>
601                    </div>
602                  </div>
603                </dl>
604
605                <!-- CALLBACK -->
606                <div>
607                  <div>
608                  <h4>Callback function</h4>
609                  <p>
610                    The callback <em>parameter</em> should specify a function
611                    that looks like this:
612                  </p>
613                  <p>
614                    If you specify the <em>callback</em> parameter, it should
615                    specify a function that looks like this:
616                  </p>
617
618                  <!-- Note: intentionally longer 80 columns -->
619                  <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre>
620                  <dl>
621                    <div>
622                      <div>
623                      </div>
624                    </div>
625                  </dl>
626                  </div>
627                </div>
628
629                <!-- MIN_VERSION -->
630                <p>
631                  This function was added in version <b><span></span></b>.
632                  If you require this function, the manifest key
633                  <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a>
634                  can ensure that your extension won't be run in an earlier browser version.
635                </p>
636              </div> <!-- /description -->
637
638            </div>  <!-- /apiItem -->
639
640          </div>  <!-- /apiGroup -->
641
642          <!-- EVENTS -->
643          <div id="eventsTemplate" class="apiGroup">
644            <a></a>
645            <h3>Events</h3>
646            <!-- iterates over all events -->
647            <div class="apiItem">
648              <a></a>
649              <h4>event name</h4>
650
651              <div class="summary">
652                <!-- Note: intentionally longer 80 columns -->
653                <span class="subdued">chrome.bookmarks</span><span>onEvent</span><span class="subdued">.addListener</span>(function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>);
654              </div>
655
656              <div class="description">
657                <p class="todo">Undocumented.</p>
658                <p>
659                  A description from the json schema def of the event goes here.
660                </p>
661
662                <!-- PARAMETERS -->
663                <div>
664                  <h4>Parameters</h4>
665                  <dl>
666                    <div>
667                      <div>
668                      </div>
669                    </div>
670                  </dl>
671                </div>
672              </div> <!-- /decription -->
673
674            </div> <!-- /apiItem -->
675
676          </div> <!-- /apiGroup -->
677
678          <!-- TYPES -->
679          <div class="apiGroup">
680            <a name="types"></a>
681            <h3 id="types">Types</h3>
682
683            <!-- iterates over all types -->
684            <div class="apiItem">
685              <a></a>
686              <h4>type name</h4>
687
688              <div>
689              </div>
690
691            </div> <!-- /apiItem -->
692
693          </div> <!-- /apiGroup -->
694
695        </div> <!-- /apiPage -->
696      </div> <!-- /gc-pagecontent -->
697    </div> <!-- /g-section -->
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700      <div class="text">
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702  Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>,
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704  Attribution 3.0 License</a>, and code samples are licensed under the
705  <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>.
706  </p>
707  <p>
708  ©2011 Google
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736