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187 <div id="pageTitle"> | |
188 <h1 class="page_title">Tutorial: Google Analytics</h1> | |
189 </div> | |
190 <!-- TABLE OF CONTENTS --> | |
191 <div id="toc"> | |
192 <h2>Contents</h2> | |
193 <ol> | |
194 <li> | |
195 <a href="#toc-requirements">Requirements</a> | |
196 <ol> | |
197 </ol> | |
198 </li><li> | |
199 <a href="#toc-installing">Installing the tracking code</a> | |
200 <ol> | |
201 </ol> | |
202 </li><li> | |
203 <a href="#toc-tracking-pageviews">Tracking page views</a> | |
204 <ol> | |
205 </ol> | |
206 </li><li> | |
207 <a href="#toc-debugging">Monitoring analytics requests</a> | |
208 <ol> | |
209 </ol> | |
210 </li><li> | |
211 <a href="#toc-tracking-events">Tracking events</a> | |
212 <ol> | |
213 </ol> | |
214 </li><li> | |
215 <a href="#toc-samplecode">Sample code</a> | |
216 <ol> | |
217 </ol> | |
218 </li> | |
219 </ol> | |
220 </div> | |
221 <!-- /TABLE OF CONTENTS --> | |
222 <!-- Standard content lead-in for experimental API pages --> | |
223 <!-- STATIC CONTENT PLACEHOLDER --> | |
224 <div id="static"><div id="pageData-name" class="pageData">Tutorial: Goog
le Analytics</div> | |
225 <div id="pageData-showTOC" class="pageData">true</div> | |
226 <p>This tutorial demonstrates using Google Analytics to track the usage of your | |
227 extension.</p> | |
228 <h2 id="toc-requirements">Requirements</h2> | |
229 <p> | |
230 This tutorial expects that you have some familiarity writing extensions for | |
231 Google Chrome. If you need information on how to write an extension, please | |
232 read the <a href="gettingstarted.html">Getting Started tutorial</a>. | |
233 </p> | |
234 <p> | |
235 You will also need a <a href="http://www.google.com/analytics">Google | |
236 Analytics account</a> set up to track your extension. Note that when setting | |
237 up the account, you can use any value in the Website's URL field, as your | |
238 extension will not have an URL of its own. | |
239 </p> | |
240 <p style="text-align: center"> | |
241 <img src="images/tut_analytics/screenshot01.png" style="width:400px;height:82p
x;" alt="The analytics setup with info for a chrome extension filled out."> | |
242 </p> | |
243 <h2 id="toc-installing">Installing the tracking code</h2> | |
244 <p> | |
245 The standard Google Analytics tracking code snippet fetches a file named | |
246 <code>ga.js</code> from an SSL protected URL if the current page | |
247 was loaded using the <code>https://</code> protocol. <strong>Chrome | |
248 extensions and applications may <em>only</em> use the SSL-protected version of | |
249 <code>ga.js</code></strong>. Loading <code>ga.js</code> over insecure HTTP is | |
250 disallowed by Chrome's default <a href="contentSecurityPolicy.html">Content | |
251 Security Policy</a>. This, plus the fact that Chrome extensions are hosted | |
252 under the <code>chrome-extension://</code> schema, requires a slight | |
253 modification to the usual tracking snippet to pull <code>ga.js</code> directly | |
254 from <code>https://ssl.google-analytics.com/ga.js</code> instead of the | |
255 default location. | |
256 </p> | |
257 <p> | |
258 Below is a modified snippet for the | |
259 <a href="http://code.google.com/apis/analytics/docs/tracking/asyncTracking.htm
l">asynchronous | |
260 tracking API</a> (the modified line is bolded): | |
261 </p> | |
262 <pre>(function() { | |
263 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.asy
nc = true; | |
264 <strong>ga.src = 'https://ssl.google-analytics.com/ga.js';</strong> | |
265 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(
ga, s); | |
266 })(); | |
267 </pre> | |
268 <p> | |
269 You'll also need to ensure that your extension has access to load the resource | |
270 by relaxing the default content security policy. The policy definition in your | |
271 <a href="manifest.html"><code>manifest.json</code></a> might look like: | |
272 </p> | |
273 <pre>{ | |
274 ..., | |
275 "content_security_policy": "script-src 'self' https://ssl.google-analytics.com
; object-src 'self'", | |
276 ... | |
277 }</pre> | |
278 <p> | |
279 Here is a popup page (<code>popup.html</code>) which loads the asynchronous | |
280 tracking code via an external JavaScript file (<code>popup.js</code>) and | |
281 tracks a single page view: | |
282 </p> | |
283 <pre>popup.js: | |
284 ========= | |
285 var _gaq = _gaq || []; | |
286 _gaq.push(['_setAccount', 'UA-XXXXXXXX-X']); | |
287 _gaq.push(['_trackPageview']); | |
288 (function() { | |
289 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.asy
nc = true; | |
290 ga.src = 'https://ssl.google-analytics.com/ga.js'; | |
291 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(
ga, s); | |
292 })(); | |
293 popup.html: | |
294 =========== | |
295 <!DOCTYPE html> | |
296 <html> | |
297 <head> | |
298 ... | |
299 <script src="popup.js"></script> | |
300 </head> | |
301 <body> | |
302 ... | |
303 </body> | |
304 </html> | |
305 </pre> | |
306 <p> | |
307 Keep in mind that the string <code>UA-XXXXXXXX-X</code> should be replaced | |
308 with your own Google Analytics account number. | |
309 </p> | |
310 <h2 id="toc-tracking-pageviews">Tracking page views</h2> | |
311 <p> | |
312 The <code>_gaq.push(['_trackPageview']);</code> code will track a single | |
313 page view. This code may be used on any page in your extension. When | |
314 placed on a background page, it will register a view once per browser | |
315 session. When placed on a popup, it will register a view once every time | |
316 the popup is opened. | |
317 </p> | |
318 <p> | |
319 By looking at the page view data for each page in your extension, you can | |
320 get an idea of how many times your users interact with your extension per | |
321 browser session: | |
322 </p> | |
323 <p style="text-align: center"> | |
324 <img src="images/tut_analytics/screenshot02.png" style="width:300px;height:119
px;" alt="Analytics view of the top content for a site."> | |
325 </p> | |
326 <h2 id="toc-debugging">Monitoring analytics requests</h2> | |
327 <p> | |
328 To ensure that tracking data from your extension is being sent to Google | |
329 Analytics, you can inspect the pages of your extension in the | |
330 Developer Tools window (see the | |
331 <a href="tut_debugging.html">debugging tutorial</a> for more information). | |
332 As the following figure shows, you should see requests for a file named | |
333 <strong>__utm.gif</strong> if everything is set up correctly. | |
334 </p> | |
335 <p style="text-align: center"> | |
336 <img src="images/tut_analytics/screenshot04.png" style="width:683px;height:418
px;" alt="Developer Tools window showing the __utm.gif request"> | |
337 </p> | |
338 <h2 id="toc-tracking-events">Tracking events</h2> | |
339 <p> | |
340 By configuring event tracking, you can determine which parts of your | |
341 extension your users interact with the most. For example, if you have | |
342 three buttons users may click: | |
343 </p> | |
344 <pre> <button id='button1'>Button 1</button> | |
345 <button id='button2'>Button 2</button> | |
346 <button id='button3'>Button 3</button> | |
347 </pre> | |
348 <p> | |
349 Write a function that sends click events to Google Analytics: | |
350 </p> | |
351 <pre> function trackButton(e) { | |
352 _gaq.push(['_trackEvent', e.target.id, 'clicked']); | |
353 }; | |
354 </pre> | |
355 <p> | |
356 And use it as an event handler for each button's click: | |
357 </p> | |
358 <pre> var buttons = document.querySelectorAll('button'); | |
359 for (var i = 0; i < buttons.length; i++) { | |
360 buttons[i].addEventListener('click', trackButtonClick); | |
361 } | |
362 </pre> | |
363 <p> | |
364 The Google Analytics event tracking overview page will give you metrics | |
365 regarding how many times each individual button is clicked: | |
366 </p> | |
367 <p style="text-align: center"> | |
368 <img src="images/tut_analytics/screenshot03.png" style="width:300px;height:482
px;" alt="Analytics view of the event tracking data for a site."> | |
369 </p> | |
370 <p> | |
371 By using this approach, you can see which parts of your extension are | |
372 under-or-overutilized. This information can help guide decisions about UI | |
373 redesigns or additional functionality to implement. | |
374 </p> | |
375 <p> | |
376 For more information about using the event tracking API, see the | |
377 Google Analytics | |
378 <a href="http://code.google.com/apis/analytics/docs/tracking/eventTrackerOverv
iew.html">developer | |
379 documentation</a>. | |
380 </p> | |
381 <h2 id="toc-samplecode">Sample code</h2> | |
382 <p> | |
383 A sample extension that uses these techniques is | |
384 available in the Chromium source tree: | |
385 </p> | |
386 <blockquote> | |
387 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensi
ons/docs/examples/tutorials/analytics/">.../examples/tutorials/analytics/</a> | |
388 </blockquote> | |
389 <p></p> | |
390 </div> | |
391 <!-- API PAGE --> | |
392 <!-- /apiPage --> | |
393 </div> <!-- /gc-pagecontent --> | |
394 </div> <!-- /g-section --> | |
395 </div> <!-- /codesiteContent --> | |
396 <div id="gc-footer" --=""> | |
397 <div class="text"> | |
398 <p> | |
399 Except as otherwise <a href="http://code.google.com/policies.html#restrictions
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400 the content of this page is licensed under the <a rel="license" href="http://c
reativecommons.org/licenses/by/3.0/">Creative Commons | |
401 Attribution 3.0 License</a>, and code samples are licensed under the | |
402 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD Lic
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403 </p> | |
404 <p> | |
405 ©2011 Google | |
406 </p> | |
407 <!-- begin analytics --> | |
408 <script src="https://www.google-analytics.com/urchin.js" type="text/javascript">
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409 <script src="https://www.google-analytics.com/ga.js" type="text/javascript"></sc
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411 // chrome doc tracking | |
412 try { | |
413 var engdocs = _gat._getTracker("YT-10763712-2"); | |
414 engdocs._trackPageview(); | |
415 } catch(err) {} | |
416 // code.google.com site-wide tracking | |
417 try { | |
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419 _uanchor=1; | |
420 _uff=0; | |
421 urchinTracker(); | |
422 } | |
423 catch(e) {/* urchinTracker not available. */} | |
424 </script> | |
425 <!-- end analytics --> | |
426 </div> | |
427 </div> <!-- /gc-footer --> | |
428 </div> <!-- /gc-container --> | |
429 </body></html> | |
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