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: Getting Started (Hello, World!) - 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 class="leftNavSelected">Getting Started</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">Tutorial: Getting Started (Hello, World!)</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc"> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a href="#load">Create and load an extension</a> 262 <ol> 263 <li style="display: none; "> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li><li> 268 <a href="#code">Add code to the extension</a> 269 <ol> 270 <li style="display: none; "> 271 <a>h3Name</a> 272 </li> 273 </ol> 274 </li><li> 275 <a href="#summary">Now what?</a> 276 <ol> 277 <li style="display: none; "> 278 <a>h3Name</a> 279 </li> 280 </ol> 281 </li> 282 <li style="display: none; "> 283 <a href="#apiReference">API reference</a> 284 <ol> 285 <li> 286 <a href="#properties">Properties</a> 287 <ol> 288 <li> 289 <a href="#property-anchor">propertyName</a> 290 </li> 291 </ol> 292 </li> 293 <li> 294 <a>Methods</a> 295 <ol> 296 <li> 297 <a href="#method-anchor">methodName</a> 298 </li> 299 </ol> 300 </li> 301 <li> 302 <a>Events</a> 303 <ol> 304 <li> 305 <a href="#event-anchor">eventName</a> 306 </li> 307 </ol> 308 </li> 309 <li> 310 <a href="#types">Types</a> 311 <ol> 312 <li> 313 <a href="#id-anchor">id</a> 314 </li> 315 </ol> 316 </li> 317 </ol> 318 </li> 319 </ol> 320 </div> 321 <!-- /TABLE OF CONTENTS --> 322 323 <!-- Standard content lead-in for experimental API pages --> 324 <p id="classSummary" style="display: none; "> 325 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 326 </p> 327 328 <!-- STATIC CONTENT PLACEHOLDER --> 329 <div id="static"><div id="pageData-name" class="pageData">Tutorial: Getting Started (Hello, World!)</div> 330<div id="pageData-showTOC" class="pageData">true</div> 331 332<p> 333This tutorial walks you through creating a simple extension. 334You'll add an icon to Google Chrome 335that, when clicked, displays an automatically generated page. 336The icon and page will look something like this: 337</p> 338 339<img src="images/hello-world-small.png" width="300" height="221" alt="a window with a grid of images related to HELLO WORLD"> 340 341<p> 342You can develop extensions using any release of Google Chrome, 343on Windows, Mac, or Linux. 344</p> 345 346<h2 id="load">Create and load an extension</h2> 347<p> 348In this section, you'll write an extension 349that adds a <em>browser action</em> 350to the toolbar of Google Chrome. 351</p> 352 353<ol> 354 <li> 355 Create a folder somewhere on your computer to contain your extension's code. 356 </li> 357 <li> 358 Inside your extension's folder, 359 create a text file called <strong><code>manifest.json</code></strong>, 360 and put this in it: 361<pre>{ 362 "name": "My First Extension", 363 "version": "1.0", 364 "description": "The first extension that I made.", 365 "browser_action": { 366 "default_icon": "icon.png" 367 }, 368 "permissions": [ 369 "http://api.flickr.com/" 370 ] 371}</pre> 372 </li> 373 <li> 374 Copy this icon to the same folder:<br> 375 <table cellpadding="0" cellspacing="0" style="border:0"> 376 <tbody><tr> 377 <td style="text-align:center; border:0;"><a href="examples/tutorials/getstarted/icon.png"><img src="examples/tutorials/getstarted/icon.png" width="19" height="19" border="0"></a><br> 378 <a href="examples/tutorials/getstarted/icon.png">Download icon.png</a></td> 379 </tr> 380 </tbody></table> 381 </li> 382 <li id="load-ext"> Load the extension. 383 <ol type="a"> 384 <li style="margin-top:0"> 385 Bring up the extensions management page 386 by clicking the wrench icon 387 <img src="images/toolsmenu.gif" width="29" height="29" alt="" style="margin-top:0"> 388 and choosing <b>Tools > Extensions</b>. 389 </li> 390 391 <li> 392 If <b>Developer mode</b> has a + by it, 393 click the + to add developer information to the page. 394 The + changes to a -, 395 and more buttons and information appear. 396 </li> 397 398 <li> 399 Click the <b>Load unpacked extension</b> button. 400 A file dialog appears. 401 </li> 402 403 <li> 404 In the file dialog, 405 navigate to your extension's folder 406 and click <b>OK</b>. 407 </li> 408 </ol> </li> 409 </ol> 410 411<p> 412If your extension is valid, 413its icon appears next to the address bar, 414and information about the extension 415appears in the extensions page, 416as the following screenshot shows. 417</p> 418 419<p> 420<a href="images/load_after.png"><img src="images/load_after_small.png" width="300" height="132"></a> 421</p> 422 423<h2 id="code">Add code to the extension</h2> 424<p> In this step, you'll make your extension <em>do</em> something besides just look good. </p> 425<ol> 426 <li> 427 <p> Edit <code>manifest.json</code> to add the following line:</p> 428<pre> ... 429 "browser_action": { 430 "default_icon": "icon.png"<b>, 431 "popup": "popup.html"</b> 432 }, 433 ... 434</pre> 435 <p> Inside your extension's folder, 436 create a text file called <strong><code>popup.html</code></strong>, 437 and add the following code to it:</p> 438 <blockquote> <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/tutorials/getstarted/popup.html?content-type=text/plain" target="_blank">CSS 439 and JavaScript code for hello_world</a></blockquote> 440 </li> 441 <li> 442 Return to the extensions management page, 443 and click the <b>Reload</b> button 444 to load the new version of the extension.</li> 445 <li>Click the extension's icon. 446 A popup should appear that displays the contents of 447 <code>popup.html</code>. </li> 448</ol> 449<p> It should look something like this:</p> 450 451<img src="images/hello-world.png" width="500" height="369" alt="a popup with a grid of images related to HELLO WORLD"> 452 453<p> If you don't see the popup, 454try the instructions again, 455following them exactly. 456Don't try loading an HTML file that isn't in the extension's folder — 457it won't work! </p> 458 459<h2 id="summary">Now what?</h2> 460 461<!-- [PENDING: Summarize what we did, what it means, what else we would've done if this were a real extension (e.g. package/zip it), and where to find more information.] --> 462 463<p> 464Here are some suggestions for what to read next: 465</p> 466 467<ul> 468 <li> 469 The <a href="overview.html">Overview</a>, 470 which has important conceptual and practical information 471 </li> 472 <li> 473 The 474 <a href="tut_debugging.html">debugging tutorial</a>, 475 which starts where this tutorial leaves off 476 </li> 477 <li> 478 The <a href="hosting.html">hosting</a> page, 479 which tells you about options for distributing your extension 480 </li> 481</ul> 482 483<p> 484If you don't feel like reading, try these: 485</p> 486<ul> 487 <li> 488 Keep up to date with the latest news: 489 <a href="http://groups.google.com/a/chromium.org/group/chromium-extensions/subscribe">subscribe to chromium-extensions</a> 490 </li> 491 <li> 492 Look at some 493 <a href="samples.html">sample extensions</a> 494 </li> 495 <li> 496 Watch some 497 <a href="http://www.youtube.com/view_play_list?p=CA101D6A85FE9D4B">videos</a>, such as 498 <a href="http://www.youtube.com/watch?v=e3McMaHvlBY&feature=PlayList&p=CA101D6A85FE9D4B&index=3">How to build an extension</a> 499 </li> 500</ul> 501</div> 502 503 <!-- API PAGE --> 504 <div class="apiPage" style="display: none; "> 505 <a name="apiReference"></a> 506 <h2>API reference: chrome.apiname </h2> 507 508 <!-- PROPERTIES --> 509 <div class="apiGroup"> 510 <a name="properties"></a> 511 <h3 id="properties">Properties</h3> 512 513 <div> 514 <a></a> 515 <h4>getLastError</h4> 516 <div class="summary"> 517 <!-- Note: intentionally longer 80 columns --> 518 <span>chrome.extension</span><span>lastError</span> 519 </div> 520 <div> 521 </div> 522 </div> 523 524 </div> <!-- /apiGroup --> 525 526 <!-- METHODS --> 527 <div id="methodsTemplate" class="apiGroup"> 528 <a></a> 529 <h3>Methods</h3> 530 531 <!-- iterates over all functions --> 532 <div class="apiItem"> 533 <a></a> <!-- method-anchor --> 534 <h4>method name</h4> 535 536 <div class="summary"><span>void</span> 537 <!-- Note: intentionally longer 80 columns --> 538 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 539 <var><span></span></var></span>)</div> 540 541 <div class="description"> 542 <p class="todo">Undocumented.</p> 543 <p> 544 A description from the json schema def of the function goes here. 545 </p> 546 547 <!-- PARAMETERS --> 548 <h4>Parameters</h4> 549 <dl> 550 <div> 551 <div> 552 </div> 553 </div> 554 </dl> 555 556 <!-- RETURNS --> 557 <h4>Returns</h4> 558 <dl> 559 <div> 560 <div> 561 </div> 562 </div> 563 </dl> 564 565 <!-- CALLBACK --> 566 <div> 567 <div> 568 <h4>Callback function</h4> 569 <p> 570 The callback <em>parameter</em> should specify a function 571 that looks like this: 572 </p> 573 <p> 574 If you specify the <em>callback</em> parameter, it should 575 specify a function that looks like this: 576 </p> 577 578 <!-- Note: intentionally longer 80 columns --> 579 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 580 <dl> 581 <div> 582 <div> 583 </div> 584 </div> 585 </dl> 586 </div> 587 </div> 588 589 <!-- MIN_VERSION --> 590 <p> 591 This function was added in version <b><span></span></b>. 592 If you require this function, the manifest key 593 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 594 can ensure that your extension won't be run in an earlier browser version. 595 </p> 596 </div> <!-- /description --> 597 598 </div> <!-- /apiItem --> 599 600 </div> <!-- /apiGroup --> 601 602 <!-- EVENTS --> 603 <div id="eventsTemplate" class="apiGroup"> 604 <a></a> 605 <h3>Events</h3> 606 <!-- iterates over all events --> 607 <div class="apiItem"> 608 <a></a> 609 <h4>event name</h4> 610 611 <div class="summary"> 612 <!-- Note: intentionally longer 80 columns --> 613 <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>); 614 </div> 615 616 <div class="description"> 617 <p class="todo">Undocumented.</p> 618 <p> 619 A description from the json schema def of the event goes here. 620 </p> 621 622 <!-- PARAMETERS --> 623 <div> 624 <h4>Parameters</h4> 625 <dl> 626 <div> 627 <div> 628 </div> 629 </div> 630 </dl> 631 </div> 632 </div> <!-- /decription --> 633 634 </div> <!-- /apiItem --> 635 636 </div> <!-- /apiGroup --> 637 638 <!-- TYPES --> 639 <div class="apiGroup"> 640 <a name="types"></a> 641 <h3 id="types">Types</h3> 642 643 <!-- iterates over all types --> 644 <div class="apiItem"> 645 <a></a> 646 <h4>type name</h4> 647 648 <div> 649 </div> 650 651 </div> <!-- /apiItem --> 652 653 </div> <!-- /apiGroup --> 654 655 </div> <!-- /apiPage --> 656 </div> <!-- /gc-pagecontent --> 657 </div> <!-- /g-section --> 658 </div> <!-- /codesiteContent --> 659 <div id="gc-footer" --=""> 660 <div class="text"> 661 <p> 662 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 663 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 664 Attribution 3.0 License</a>, and code samples are licensed under the 665 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 666 </p> 667 <p> 668 ©2011 Google 669 </p> 670 671<!-- begin analytics --> 672<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 673<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 674 675<script type="text/javascript"> 676 // chrome doc tracking 677 try { 678 var engdocs = _gat._getTracker("YT-10763712-2"); 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