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>Developer's Guide - 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; margin:0;"></a></td> 121 <td valign="middle" width="100%" style="padding-left:0.6em;"> 122 <form action="http://www.google.com/cse" id="cse" style="margin-top:0.5em"> 123 <div id="gsc-search-box"> 124 <input type="hidden" name="cx" value="002967670403910741006:61_cvzfqtno"> 125 <input type="hidden" name="ie" value="UTF-8"> 126 <input type="text" name="q" value="" size="55"> 127 <input class="gsc-search-button" type="submit" name="sa" value="Search"> 128 <br> 129 <span class="greytext">e.g. "page action" or "tabs"</span> 130 </div> 131 </form> 132 133 <script type="text/javascript" src="http://www.google.com/jsapi"></script> 134 <script type="text/javascript">google.load("elements", "1", {packages: "transliteration"});</script> 135 <script type="text/javascript" src="http://www.google.com/coop/cse/t13n?form=cse&t13n_langs=en"></script> 136 <script type="text/javascript" src="http://www.google.com/coop/cse/brand?form=cse&lang=en"></script> 137 </td> 138 </tr> 139 </tbody></table> 140 141 <div id="codesiteContent" class=""> 142 143 <a id="gc-topnav-anchor"></a> 144 <div id="gc-topnav"> 145 <h1>Google Chrome Extensions (<a href="http://code.google.com/labs/">Labs</a>)</h1> 146 <ul id="home" class="gc-topnav-tabs"> 147 <li id="home_link"> 148 <a href="index.html" title="Google Chrome Extensions home page">Home</a> 149 </li> 150 <li id="docs_link"> 151 <a href="docs.html" title="Official Google Chrome Extensions documentation">Docs</a> 152 </li> 153 <li id="faq_link"> 154 <a href="faq.html" title="Answers to frequently asked questions about Google Chrome Extensions">FAQ</a> 155 </li> 156 <li id="samples_link"> 157 <a href="samples.html" title="Sample extensions (with source code)">Samples</a> 158 </li> 159 <li id="group_link"> 160 <a href="http://groups.google.com/a/chromium.org/group/chromium-extensions" title="Google Chrome Extensions developer forum">Group</a> 161 </li> 162 </ul> 163 </div> <!-- end gc-topnav --> 164 165 <div class="g-section g-tpl-170"> 166 <!-- SIDENAV --> 167 <div class="g-unit g-first" id="gc-toc"> 168 <ul> 169 <li><a href="getstarted.html">Getting Started</a></li> 170 <li><a href="overview.html">Overview</a></li> 171 <li><a href="whats_new.html">What's New?</a></li> 172 <li><h2><a href="devguide.html">Developer's Guide</a></h2> 173 <ul> 174 <li>Browser UI 175 <ul> 176 <li><a href="browserAction.html">Browser Actions</a></li> 177 <li><a href="contextMenus.html">Context Menus</a></li> 178 <li><a href="notifications.html">Desktop Notifications</a></li> 179 <li><a href="omnibox.html">Omnibox</a></li> 180 <li><a href="options.html">Options Pages</a></li> 181 <li><a href="override.html">Override Pages</a></li> 182 <li><a href="pageAction.html">Page Actions</a></li> 183 </ul> 184 </li> 185 <li>Browser Interaction 186 <ul> 187 <li><a href="bookmarks.html">Bookmarks</a></li> 188 <li><a href="cookies.html">Cookies</a></li> 189 <li><a href="events.html">Events</a></li> 190 <li><a href="history.html">History</a></li> 191 <li><a href="management.html">Management</a></li> 192 <li><a href="tabs.html">Tabs</a></li> 193 <li><a href="windows.html">Windows</a></li> 194 </ul> 195 </li> 196 <li>Implementation 197 <ul> 198 <li><a href="a11y.html">Accessibility</a></li> 199 <li><a href="background_pages.html">Background Pages</a></li> 200 <li><a href="content_scripts.html">Content Scripts</a></li> 201 <li><a href="xhr.html">Cross-Origin XHR</a></li> 202 <li><a href="idle.html">Idle</a></li> 203 <li><a href="i18n.html">Internationalization</a></li> 204 <li><a href="messaging.html">Message Passing</a></li> 205 <li><a href="npapi.html">NPAPI Plugins</a></li> 206 </ul> 207 </li> 208 <li>Finishing 209 <ul> 210 <li><a href="hosting.html">Hosting</a></li> 211 <li><a href="external_extensions.html">Other Deployment Options</a></li> 212 </ul> 213 </li> 214 </ul> 215 </li> 216 <li><h2><a href="apps.html">Packaged Apps</a></h2></li> 217 <li><h2><a href="tutorials.html">Tutorials</a></h2> 218 <ul> 219 <li><a href="tut_debugging.html">Debugging</a></li> 220 <li><a href="tut_analytics.html">Google Analytics</a></li> 221 <li><a href="tut_oauth.html">OAuth</a></li> 222 </ul> 223 </li> 224 <li><h2>Reference</h2> 225 <ul> 226 <li>Formats 227 <ul> 228 <li><a href="manifest.html">Manifest Files</a></li> 229 <li><a href="match_patterns.html">Match Patterns</a></li> 230 </ul> 231 </li> 232 <li><a href="permission_warnings.html">Permission Warnings</a></li> 233 <li><a href="api_index.html">chrome.* APIs</a></li> 234 <li><a href="api_other.html">Other APIs</a></li> 235 </ul> 236 </li> 237 <li><h2><a href="samples.html">Samples</a></h2></li> 238 <div class="line"> </div> 239 <li><h2>More</h2> 240 <ul> 241 <li><a href="http://code.google.com/chrome/webstore/docs/index.html">Chrome Web Store</a></li> 242 <li><a href="http://code.google.com/chrome/apps/docs/developers_guide.html">Hosted Apps</a></li> 243 <li><a href="themes.html">Themes</a></li> 244 </ul> 245 </li> 246 </ul> 247 </div> 248 <script> 249 initToggles(); 250 </script> 251 252 <div class="g-unit" id="gc-pagecontent"> 253 <div id="pageTitle"> 254 <h1 class="page_title">Developer's Guide</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc" style="display: none; "> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a>h2Name</a> 262 <ol> 263 <li> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li> 268 <li> 269 <a href="#apiReference">API reference</a> 270 <ol> 271 <li> 272 <a href="#properties">Properties</a> 273 <ol> 274 <li> 275 <a href="#property-anchor">propertyName</a> 276 </li> 277 </ol> 278 </li> 279 <li> 280 <a>Methods</a> 281 <ol> 282 <li> 283 <a href="#method-anchor">methodName</a> 284 </li> 285 </ol> 286 </li> 287 <li> 288 <a>Events</a> 289 <ol> 290 <li> 291 <a href="#event-anchor">eventName</a> 292 </li> 293 </ol> 294 </li> 295 <li> 296 <a href="#types">Types</a> 297 <ol> 298 <li> 299 <a href="#id-anchor">id</a> 300 </li> 301 </ol> 302 </li> 303 </ol> 304 </li> 305 </ol> 306 </div> 307 <!-- /TABLE OF CONTENTS --> 308 309 <!-- Standard content lead-in for experimental API pages --> 310 <p id="classSummary" style="display: none; "> 311 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 312 </p> 313 314 <!-- STATIC CONTENT PLACEHOLDER --> 315 <div id="static"><div id="pageData-name" class="pageData">Developer's Guide</div> 316 317 <p> 318 These pages assume you've completed 319 the <a href="getstarted.html">Getting Started</a> tutorial 320 and <a href="overview.html">Overview</a>. 321 Unless otherwise stated, everything in this page 322 applies to packaged apps, as well as extensions. 323 </p> 324 325 <table class="columns"> 326 <tbody><tr> 327 <td colspan="2"><h4>Changing the Google Chrome chrome</h4></td> 328 </tr> 329 <tr> 330 <td colspan="2"> </td> 331 </tr> 332 <tr> 333 <td> <a href="browserAction.html">Browser Actions</a> </td> 334 <td> Add icons to the toolbar <em>(extensions only)</em> </td> 335 </tr> 336 <tr> 337 <td> <a href="notifications.html">Desktop Notifications</a> </td> 338 <td> Notify users of important events </td> 339 </tr> 340 <tr> 341 <td> <a href="omnibox.html">Omnibox</a> </td> 342 <td> Add a keyword to the address bar </td> 343 </tr> 344 <tr> 345 <td> <a href="options.html">Options Pages</a> </td> 346 <td> Let users customize your extension </td> 347 </tr> 348 <tr> 349 <td> <a href="override.html">Override Pages</a> </td> 350 <td> Implement your own version of standard browser pages 351 such as the New Tab page</td> 352 </tr> 353 <tr> 354 <td> <a href="pageAction.html">Page Actions</a> </td> 355 <td> Add temporary icons inside the address bar <em>(extensions only)</em> </td> 356 </tr> 357 <tr> 358 <td> <a href="themes.html">Themes</a> </td> 359 <td> Change the overall appearance of the browser </td> 360 </tr> 361 362 <tr> 363 <td colspan="2"><h4>Interacting with Google Chrome in other ways</h4></td> 364 </tr> 365 <tr> 366 <td colspan="2"> </td> 367 </tr> 368 <tr> 369 <td> <a href="bookmarks.html">Bookmarks</a> </td> 370 <td> Create, organize, and otherwise manipulate the user's bookmarks </td> 371 </tr> 372 <tr> 373 <td> <a href="cookies.html">Cookies</a> </td> 374 <td> Explore and modify the browser's cookie system </td> 375 </tr> 376 <tr> 377 <td> <a href="events.html">Events</a> </td> 378 <td> Detect when something interesting happens </td> 379 </tr> 380 <tr> 381 <td> <a href="history.html">History</a> </td> 382 <td> Interact with the browser's record of visited pages </td> 383 </tr> 384 <tr> 385 <td> <a href="tabs.html">Tabs</a> </td> 386 <td> Create, modify, and rearrange tabs in the browser </td> 387 </tr> 388 <tr> 389 <td> <a href="windows.html">Windows</a> </td> 390 <td> Create, modify, and rearrange windows in the browser </td> 391 </tr> 392 393 <tr> 394 <td colspan="2"><h4>Implementing the innards of your extension</h4></td> 395 </tr> 396 <tr> 397 <td colspan="2"> </td> 398 </tr> 399 <tr> 400 <td> <a href="a11y.html">Accessibility (a11y)</a> </td> 401 <td> Make your extension accessible to people with disabilities </td> 402 </tr> 403 <tr> 404 <td> <a href="background_pages.html">Background Pages</a> </td> 405 <td> Put all the common code for your extension in a single place </td> 406 </tr> 407 <tr> 408 <td> <a href="content_scripts.html">Content Scripts</a> </td> 409 <td> Run JavaScript code in the context of web pages </td> 410 </tr> 411 <tr> 412 <td> <a href="xhr.html">Cross-Origin XHR</a> </td> 413 <td> Use XMLHttpRequest to send and receive data from remote servers </td> 414 </tr> 415 <tr> 416 <td> <a href="i18n.html">Internationalization</a> </td> 417 <td> Deal with language and locale </td> 418 </tr> 419 <tr> 420 <td> <a href="messaging.html">Message Passing</a> </td> 421 <td> Communicate from a content script to its parent extension, 422 or vice versa</td> 423 </tr> 424 <tr> 425 <td> <a href="npapi.html">NPAPI Plugins</a> </td> 426 <td> Load native binary code </td> 427 </tr> 428 429 <tr> 430 <td colspan="2"><h4>Finishing and distributing your extension</h4></td> 431 </tr> 432 <tr> 433 <td colspan="2"> </td> 434 </tr> 435 <tr> 436 <td> <a href="autoupdate.html">Autoupdating</a> </td> 437 <td> Update extensions automatically </td> 438 </tr> 439 <tr> 440 <td> <a href="hosting.html">Hosting</a> </td> 441 <td> Host extensions on Google servers or your own </td> 442 </tr> 443 <tr> 444 <td> <a href="external_extensions.html">Other Deployment Options</a> </td> 445 <td> Distribute extensions on your network or with other software </td> 446 </tr> 447 <tr> 448 <td> <a href="packaging.html">Packaging</a> </td> 449 <td> Create a <code>.crx</code> file so you can distribute your extension </td> 450 </tr> 451 </tbody></table> 452 453 </div> 454 455 <!-- API PAGE --> 456 <div class="apiPage" style="display: none; "> 457 <a name="apiReference"></a> 458 <h2>API reference: chrome.apiname </h2> 459 460 <!-- PROPERTIES --> 461 <div class="apiGroup"> 462 <a name="properties"></a> 463 <h3 id="properties">Properties</h3> 464 465 <div> 466 <a></a> 467 <h4>getLastError</h4> 468 <div class="summary"> 469 <!-- Note: intentionally longer 80 columns --> 470 <span>chrome.extension</span><span>lastError</span> 471 </div> 472 <div> 473 </div> 474 </div> 475 476 </div> <!-- /apiGroup --> 477 478 <!-- METHODS --> 479 <div id="methodsTemplate" class="apiGroup"> 480 <a></a> 481 <h3>Methods</h3> 482 483 <!-- iterates over all functions --> 484 <div class="apiItem"> 485 <a></a> <!-- method-anchor --> 486 <h4>method name</h4> 487 488 <div class="summary"><span>void</span> 489 <!-- Note: intentionally longer 80 columns --> 490 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 491 <var><span></span></var></span>)</div> 492 493 <div class="description"> 494 <p class="todo">Undocumented.</p> 495 <p> 496 A description from the json schema def of the function goes here. 497 </p> 498 499 <!-- PARAMETERS --> 500 <h4>Parameters</h4> 501 <dl> 502 <div> 503 <div> 504 </div> 505 </div> 506 </dl> 507 508 <!-- RETURNS --> 509 <h4>Returns</h4> 510 <dl> 511 <div> 512 <div> 513 </div> 514 </div> 515 </dl> 516 517 <!-- CALLBACK --> 518 <div> 519 <div> 520 <h4>Callback function</h4> 521 <p> 522 The callback <em>parameter</em> should specify a function 523 that looks like this: 524 </p> 525 <p> 526 If you specify the <em>callback</em> parameter, it should 527 specify a function that looks like this: 528 </p> 529 530 <!-- Note: intentionally longer 80 columns --> 531 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 532 <dl> 533 <div> 534 <div> 535 </div> 536 </div> 537 </dl> 538 </div> 539 </div> 540 541 <!-- MIN_VERSION --> 542 <p> 543 This function was added in version <b><span></span></b>. 544 If you require this function, the manifest key 545 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 546 can ensure that your extension won't be run in an earlier browser version. 547 </p> 548 </div> <!-- /description --> 549 550 </div> <!-- /apiItem --> 551 552 </div> <!-- /apiGroup --> 553 554 <!-- EVENTS --> 555 <div id="eventsTemplate" class="apiGroup"> 556 <a></a> 557 <h3>Events</h3> 558 <!-- iterates over all events --> 559 <div class="apiItem"> 560 <a></a> 561 <h4>event name</h4> 562 563 <div class="summary"> 564 <!-- Note: intentionally longer 80 columns --> 565 <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>); 566 </div> 567 568 <div class="description"> 569 <p class="todo">Undocumented.</p> 570 <p> 571 A description from the json schema def of the event goes here. 572 </p> 573 574 <!-- PARAMETERS --> 575 <div> 576 <h4>Parameters</h4> 577 <dl> 578 <div> 579 <div> 580 </div> 581 </div> 582 </dl> 583 </div> 584 </div> <!-- /decription --> 585 586 </div> <!-- /apiItem --> 587 588 </div> <!-- /apiGroup --> 589 590 <!-- TYPES --> 591 <div class="apiGroup"> 592 <a name="types"></a> 593 <h3 id="types">Types</h3> 594 595 <!-- iterates over all types --> 596 <div class="apiItem"> 597 <a></a> 598 <h4>type name</h4> 599 600 <div> 601 </div> 602 603 </div> <!-- /apiItem --> 604 605 </div> <!-- /apiGroup --> 606 607 </div> <!-- /apiPage --> 608 </div> <!-- /gc-pagecontent --> 609 </div> <!-- /g-section --> 610 </div> <!-- /codesiteContent --> 611 <div id="gc-footer" --=""> 612 <div class="text"> 613 <p> 614 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 615 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 616 Attribution 3.0 License</a>, and code samples are licensed under the 617 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 618 </p> 619 <p> 620 2011 Google 621 </p> 622 623 <!-- begin analytics --> 624 <script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 625 <script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 626 627 <script type="text/javascript"> 628 // chrome doc tracking 629 try { 630 var engdocs = _gat._getTracker("YT-10763712-2"); 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