1<!DOCTYPE html><!-- This page is a placeholder for generated extensions api doc. Note: 2 1) The <head> information in this page is significant, should be uniform 3 across api docs and should be edited only with knowledge of the 4 templating mechanism. 5 3) All <body>.innerHTML is genereated as an rendering step. If viewed in a 6 browser, it will be re-generated from the template, json schema and 7 authored overview content. 8 4) The <body>.innerHTML is also generated by an offline step so that this 9 page may easily be indexed by search engines. 10--><html xmlns="http://www.w3.org/1999/xhtml"><head> 11 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 12 <link href="css/ApiRefStyles.css" rel="stylesheet" type="text/css"> 13 <link href="css/print.css" rel="stylesheet" type="text/css" media="print"> 14 <script type="text/javascript" src="../../../third_party/jstemplate/jstemplate_compiled.js"> 15 </script> 16 <script type="text/javascript" src="js/api_page_generator.js"></script> 17 <script type="text/javascript" src="js/bootstrap.js"></script> 18 <script type="text/javascript" src="js/sidebar.js"></script> 19 <title>Tutorial: Debugging - Google Chrome Extensions - Google Code</title></head> 20 <body> <div id="gc-container" class="labs"> 21 <div id="devModeWarning"> 22 You are viewing extension docs in chrome via the 'file:' scheme: are you expecting to see local changes when you refresh? You'll need run chrome with --allow-file-access-from-files. 23 </div> 24 <!-- SUBTEMPLATES: DO NOT MOVE FROM THIS LOCATION --> 25 <!-- In particular, sub-templates that recurse, must be used by allowing 26 jstemplate to make a copy of the template in this section which 27 are not operated on by way of the jsskip="true" --> 28 <div style="display:none"> 29 30 <!-- VALUE --> 31 <div id="valueTemplate"> 32 <dt> 33 <var>paramName</var> 34 <em> 35 36 <!-- TYPE --> 37 <div style="display:inline"> 38 ( 39 <span class="optional">optional</span> 40 <span class="enum">enumerated</span> 41 <span id="typeTemplate"> 42 <span> 43 <a> Type</a> 44 </span> 45 <span> 46 <span> 47 array of <span><span></span></span> 48 </span> 49 <span>paramType</span> 50 <span></span> 51 </span> 52 </span> 53 ) 54 </div> 55 56 </em> 57 </dt> 58 <dd class="todo"> 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>. 67 You must omit this parameter in earlier versions, 68 and you may omit it in any version. If you require this 69 parameter, the manifest key 70 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 71 can ensure that your extension won't be run in an earlier browser version. 72 </dd> 73 74 <!-- OBJECT PROPERTIES --> 75 <dd> 76 <dl> 77 <div> 78 <div> 79 </div> 80 </div> 81 </dl> 82 </dd> 83 84 <!-- OBJECT METHODS --> 85 <dd> 86 <div></div> 87 </dd> 88 89 <!-- OBJECT EVENT FIELDS --> 90 <dd> 91 <div></div> 92 </dd> 93 94 <!-- FUNCTION PARAMETERS --> 95 <dd> 96 <div></div> 97 </dd> 98 99 </div> <!-- /VALUE --> 100 101 <div id="functionParametersTemplate"> 102 <h5>Parameters</h5> 103 <dl> 104 <div> 105 <div> 106 </div> 107 </div> 108 </dl> 109 </div> 110 </div> <!-- /SUBTEMPLATES --> 111 112 <a id="top"></a> 113 <div id="skipto"> 114 <a href="#gc-pagecontent">Skip to page content</a> 115 <a href="#gc-toc">Skip to main navigation</a> 116 </div> 117 <!-- API HEADER --> 118 <table id="header" width="100%" cellspacing="0" border="0"> 119 <tbody><tr> 120 <td valign="middle"><a href="http://code.google.com/"><img src="images/code_labs_logo.gif" height="43" width="161" alt="Google Code Labs" style="border:0; 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250 </script> 251 252 <div class="g-unit" id="gc-pagecontent"> 253 <div id="pageTitle"> 254 <h1 class="page_title">Tutorial: Debugging</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc"> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a href="#extension-info"> View extension information </a> 262 <ol> 263 <li style="display: none; "> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li><li> 268 <a href="#inspect-popup"> Inspect the popup </a> 269 <ol> 270 <li style="display: none; "> 271 <a>h3Name</a> 272 </li> 273 </ol> 274 </li><li> 275 <a href="#debug"> Use the debugger </a> 276 <ol> 277 <li style="display: none; "> 278 <a>h3Name</a> 279 </li> 280 </ol> 281 </li><li> 282 <a href="#summary">Summary</a> 283 <ol> 284 <li style="display: none; "> 285 <a>h3Name</a> 286 </li> 287 </ol> 288 </li><li> 289 <a href="#next">Now what?</a> 290 <ol> 291 <li style="display: none; "> 292 <a>h3Name</a> 293 </li> 294 </ol> 295 </li> 296 <li style="display: none; "> 297 <a href="#apiReference">API reference</a> 298 <ol> 299 <li> 300 <a href="#properties">Properties</a> 301 <ol> 302 <li> 303 <a href="#property-anchor">propertyName</a> 304 </li> 305 </ol> 306 </li> 307 <li> 308 <a>Methods</a> 309 <ol> 310 <li> 311 <a href="#method-anchor">methodName</a> 312 </li> 313 </ol> 314 </li> 315 <li> 316 <a>Events</a> 317 <ol> 318 <li> 319 <a href="#event-anchor">eventName</a> 320 </li> 321 </ol> 322 </li> 323 <li> 324 <a href="#types">Types</a> 325 <ol> 326 <li> 327 <a href="#id-anchor">id</a> 328 </li> 329 </ol> 330 </li> 331 </ol> 332 </li> 333 </ol> 334 </div> 335 <!-- /TABLE OF CONTENTS --> 336 337 <!-- Standard content lead-in for experimental API pages --> 338 <p id="classSummary" style="display: none; "> 339 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 340 </p> 341 342 <!-- STATIC CONTENT PLACEHOLDER --> 343 <div id="static"><div id="pageData-name" class="pageData">Tutorial: Debugging</div> 344<div id="pageData-showTOC" class="pageData">true</div> 345 346<p> 347This tutorial introduces you to using 348Google Chrome's built-in Developer Tools 349to interactively debug an extension. 350</p> 351 352 353<h2 id="extension-info"> View extension information </h2> 354 355<p> 356To follow this tutorial, you need 357the Hello World extension that was featured in 358<a href="getstarted.html">Getting Started</a>. 359In this section, 360you'll load the extension 361and take a look at its information 362in the Extensions page. 363</p> 364 365<ol> 366 <li> 367 <p> 368 Load the Hello World extension if it isn't already running. 369 If the extension is running, 370 you'll see the Hello World icon 371 <img src="examples/tutorials/getstarted/icon.png" width="19" height="19" alt="" style="margin:0"> 372 to the right of 373 your browser's address bar. 374 </p> 375 376 <p> 377 If the Hello World extension isn't already running, 378 find the extension files and load them. 379 If you don't have a handy copy of the files, 380 extract them from this 381 <a href="examples/tutorials/getstarted.zip">ZIP file</a>. 382 See Getting Started if you need 383 <a href="getstarted.html#load-ext">instructions 384 for loading the extension</a>. 385 </p> 386 </li> 387 388 <li> 389 Go to the Extensions page 390 (<b>chrome://extensions</b>), 391 and make sure the page is in Developer mode. 392 </li> 393 394 <li> 395 Look at the Hello World extension's information on that page. 396 You can see details such as the extension's 397 name, description, and ID. 398 </li> 399</ol> 400 401<h2 id="inspect-popup"> Inspect the popup </h2> 402 403<p> 404As long as your browser is in Developer mode, it's easy to inspect popups. 405</p> 406 407<ol> 408 <li> 409 Go to the Extensions page (<b>chrome://extensions</b>), and make sure Developer 410 mode is still enabled. The Extensions page doesn't need to be open 411 for the following to work. The browser remembers the setting, 412 even when the page isn't shown. 413 </li> 414 <li> 415 Right-click the Hello World icon 416 <img src="examples/tutorials/getstarted/icon.png" width="19" height="19" alt="" style="margin:0"> 417 and choose the <b>Inspect popup</b> menu item. The popup appears, 418 and a Developer Tools window like the following should display the code 419 for <b>popup.html</b>. 420 421 <p> 422 <img src="images/devtools-1.gif" alt="" width="500" height="294"> 423 </p> 424 The popup remains open as long as the Developer Tools window does. 425 </li> 426 <li> 427 If the <strong>Scripts</strong> button isn't already selected, 428 click it. 429 <!-- [PENDING: can we omit this step?] --> 430 </li> 431 <li> 432 Click the console button 433 <img src="images/console-button.gif" style="margin:0; padding:0" align="absmiddle" width="26" height="22" alt="">(second 434 from left, 435 at the bottom of the Developer Tools window) 436 so that you can see both the code and the console. 437 </li> 438</ol> 439 440<h2 id="debug"> Use the debugger </h2> 441 442<p> 443In this section, 444you'll follow the execution of the popup page 445as it adds images to itself. 446</p> 447 448<ol> 449 <li> 450 Set a breakpoint inside the image-adding loop 451 by searching for the string <b>img.src</b> 452 and clicking the number of the line where it occurs 453 (for example, <strong>37</strong>): 454 <p> 455 <img src="images/devtools-2.gif" alt="" width="500" height="294"> 456 </p> 457 </li> 458 459 <li> 460 Make sure you can see the <b>popup.html</b> tab. 461 It should show 20 "hello world" images. 462 </li> 463 464 <li> 465 At the console prompt, reload the popup page 466 by entering <b>location.reload(true)</b>: 467 468<pre>> <b>location.reload(true)</b> 469</pre> 470 471 <p> 472 The popup page goes blank as it begins to reload, 473 and its execution stops at line 37. 474 </p> 475 </li> 476 477 <li> 478 In the upper right part of the tools window, 479 you should see the local scope variables. 480 This section shows the current values of all variables in the current scope. 481 For example, in the following screenshot 482 the value of <code>i</code> is 0, and 483 <code>photos</code> is a node list 484 that contains at least a few elements. 485 (In fact, it contains 20 elements at indexes 0 through 19, 486 each one representing a photo.) 487 488 <p> 489 <img src="images/devtools-localvars.gif" alt="" width="225" height="215"> 490 </p> 491 </li> 492 493 <li> 494 Click the play/pause button 495 <img src="images/play-button.gif" style="margin:0; padding:0" align="absmiddle" width="22" height="20" alt="">(near 496 the top right of the Developer Tools window) 497 to go through the image-processing loop a single time. 498 Each time you click that button, 499 the value of <code>i</code> increments and 500 another icon appears in the popup page. 501 For example, when <code>i</code> is 10, 502 the popup page looks something like this: 503 </li> 504 505 <p> 506 <img src="images/devtools-3.gif" width="500" height="245" alt="the popup page with 10 images"> 507 </p> 508 509 <li> 510 Use the buttons next to the play/pause button 511 to step over, into, and out of function calls. 512 To let the page finish loading, 513 click line <b>37</b> to disable the breakpoint, 514 and then press play/pause 515 <img src="images/play-button.gif" style="margin:0; padding:0" align="absmiddle" width="22" height="20" alt="">to 516 continue execution. 517 </li> 518 519</ol> 520 521 522<h2 id="summary">Summary</h2> 523 524<p> 525This tutorial demonstrated some techniques you can use 526to debug your extensions: 527</p> 528 529<ul> 530 <li> 531 Find your extension's ID and links to its pages in 532 the <b>Extensions</b> page 533 (<b>chrome://extensions</b>). 534 </li> 535 <li> 536 View hard-to-reach pages 537 (and any other file in your extension) using 538 <b>chrome-extension://</b><em>extensionId</em><b>/</b><em>filename</em>. 539 </li> 540 <li> 541 Use Developer Tools to inspect 542 and step through a page's JavaScript code. 543 </li> 544 <li> 545 Reload the currently inspected page from the console 546 using <b>location.reload(true)</b>. 547 </li> 548</ul> 549 550 551<h2 id="next">Now what?</h2> 552 553<p> 554Now that you've been introduced to debugging, 555here are suggestions for what to do next: 556</p> 557 558<ul> 559 <li> 560 Watch the extensions video 561 <a href="http://www.youtube.com/watch?v=IP0nMv_NI1s&feature=PlayList&p=CA101D6A85FE9D4B&index=5">Developing and Debugging</a>. 562 </li> 563 <li> 564 Try installing and inspecting other extensions, 565 such as the 566 <a href="samples.html">samples</a>. 567 </li> 568 <li> 569 Try using widely available debugging APIs such as 570 <code>console.log()</code> and <code>console.error()</code> 571 in your extension's JavaScript code. 572 Example: <code>console.log("Hello, world!")</code> 573 </li> 574 <li> 575 Follow the <a href="http://www.chromium.org/devtools/google-chrome-developer-tools-tutorial">Developer Tools tutorial</a>, 576 explore the 577 <a href="http://www.chromium.org/devtools">Developer Tools site</a>, 578 and watch some video tutorials. 579 </li> 580</ul> 581 582<!-- [PENDING: do something to help people debug content scripts, which show up in blue] --> 583 584<p> 585For more ideas, 586see the <a href="getstarted.html#summary">Now what?</a> section 587of Getting Started. 588</p> 589</div> 590 591 <!-- API PAGE --> 592 <div class="apiPage" style="display: none; "> 593 <a name="apiReference"></a> 594 <h2>API reference: chrome.apiname </h2> 595 596 <!-- PROPERTIES --> 597 <div class="apiGroup"> 598 <a name="properties"></a> 599 <h3 id="properties">Properties</h3> 600 601 <div> 602 <a></a> 603 <h4>getLastError</h4> 604 <div class="summary"> 605 <!-- Note: intentionally longer 80 columns --> 606 <span>chrome.extension</span><span>lastError</span> 607 </div> 608 <div> 609 </div> 610 </div> 611 612 </div> <!-- /apiGroup --> 613 614 <!-- METHODS --> 615 <div id="methodsTemplate" class="apiGroup"> 616 <a></a> 617 <h3>Methods</h3> 618 619 <!-- iterates over all functions --> 620 <div class="apiItem"> 621 <a></a> <!-- method-anchor --> 622 <h4>method name</h4> 623 624 <div class="summary"><span>void</span> 625 <!-- Note: intentionally longer 80 columns --> 626 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 627 <var><span></span></var></span>)</div> 628 629 <div class="description"> 630 <p class="todo">Undocumented.</p> 631 <p> 632 A description from the json schema def of the function goes here. 633 </p> 634 635 <!-- PARAMETERS --> 636 <h4>Parameters</h4> 637 <dl> 638 <div> 639 <div> 640 </div> 641 </div> 642 </dl> 643 644 <!-- RETURNS --> 645 <h4>Returns</h4> 646 <dl> 647 <div> 648 <div> 649 </div> 650 </div> 651 </dl> 652 653 <!-- CALLBACK --> 654 <div> 655 <div> 656 <h4>Callback function</h4> 657 <p> 658 The callback <em>parameter</em> should specify a function 659 that looks like this: 660 </p> 661 <p> 662 If you specify the <em>callback</em> parameter, it should 663 specify a function that looks like this: 664 </p> 665 666 <!-- Note: intentionally longer 80 columns --> 667 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 668 <dl> 669 <div> 670 <div> 671 </div> 672 </div> 673 </dl> 674 </div> 675 </div> 676 677 <!-- MIN_VERSION --> 678 <p> 679 This function was added in version <b><span></span></b>. 680 If you require this function, the manifest key 681 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 682 can ensure that your extension won't be run in an earlier browser version. 683 </p> 684 </div> <!-- /description --> 685 686 </div> <!-- /apiItem --> 687 688 </div> <!-- /apiGroup --> 689 690 <!-- EVENTS --> 691 <div id="eventsTemplate" class="apiGroup"> 692 <a></a> 693 <h3>Events</h3> 694 <!-- iterates over all events --> 695 <div class="apiItem"> 696 <a></a> 697 <h4>event name</h4> 698 699 <div class="summary"> 700 <!-- Note: intentionally longer 80 columns --> 701 <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>); 702 </div> 703 704 <div class="description"> 705 <p class="todo">Undocumented.</p> 706 <p> 707 A description from the json schema def of the event goes here. 708 </p> 709 710 <!-- PARAMETERS --> 711 <div> 712 <h4>Parameters</h4> 713 <dl> 714 <div> 715 <div> 716 </div> 717 </div> 718 </dl> 719 </div> 720 </div> <!-- /decription --> 721 722 </div> <!-- /apiItem --> 723 724 </div> <!-- /apiGroup --> 725 726 <!-- TYPES --> 727 <div class="apiGroup"> 728 <a name="types"></a> 729 <h3 id="types">Types</h3> 730 731 <!-- iterates over all types --> 732 <div class="apiItem"> 733 <a></a> 734 <h4>type name</h4> 735 736 <div> 737 </div> 738 739 </div> <!-- /apiItem --> 740 741 </div> <!-- /apiGroup --> 742 743 </div> <!-- /apiPage --> 744 </div> <!-- /gc-pagecontent --> 745 </div> <!-- /g-section --> 746 </div> <!-- /codesiteContent --> 747 <div id="gc-footer" --=""> 748 <div class="text"> 749 <p> 750 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 751 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 752 Attribution 3.0 License</a>, and code samples are licensed under the 753 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 754 </p> 755 <p> 756 ©2011 Google 757 </p> 758 759<!-- begin analytics --> 760<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 761<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 762 763<script type="text/javascript"> 764 // chrome doc tracking 765 try { 766 var engdocs = _gat._getTracker("YT-10763712-2"); 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