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250 </script> 251 252 <div class="g-unit" id="gc-pagecontent"> 253 <div id="pageTitle"> 254 <h1 class="page_title">Formats: Locale-Specific Messages</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc"> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a href="#overview"> Field summary </a> 262 <ol> 263 <li style="display: none; "> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li><li> 268 <a href="#example"> Example </a> 269 <ol> 270 <li style="display: none; "> 271 <a>h3Name</a> 272 </li> 273 </ol> 274 </li><li> 275 <a href="#H2-2">Field details</a> 276 <ol> 277 <li> 278 <a href="#name">name</a> 279 </li><li> 280 <a href="#message">message</a> 281 </li><li> 282 <a href="#description">description</a> 283 </li><li> 284 <a href="#placeholders">placeholders</a> 285 </li> 286 </ol> 287 </li> 288 <li style="display: none; "> 289 <a href="#apiReference">API reference</a> 290 <ol> 291 <li> 292 <a href="#properties">Properties</a> 293 <ol> 294 <li> 295 <a href="#property-anchor">propertyName</a> 296 </li> 297 </ol> 298 </li> 299 <li> 300 <a>Methods</a> 301 <ol> 302 <li> 303 <a href="#method-anchor">methodName</a> 304 </li> 305 </ol> 306 </li> 307 <li> 308 <a>Events</a> 309 <ol> 310 <li> 311 <a href="#event-anchor">eventName</a> 312 </li> 313 </ol> 314 </li> 315 <li> 316 <a href="#types">Types</a> 317 <ol> 318 <li> 319 <a href="#id-anchor">id</a> 320 </li> 321 </ol> 322 </li> 323 </ol> 324 </li> 325 </ol> 326 </div> 327 <!-- /TABLE OF CONTENTS --> 328 329 <!-- Standard content lead-in for experimental API pages --> 330 <p id="classSummary" style="display: none; "> 331 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 332 </p> 333 334 <!-- STATIC CONTENT PLACEHOLDER --> 335 <div id="static"><div id="pageData-name" class="pageData">Formats: Locale-Specific Messages</div> 336<div id="pageData-showTOC" class="pageData">true</div> 337 338<p> 339Each internationalized extension has at least one 340file named <code>messages.json</code> 341that provides locale-specific strings for the extension. 342This page describes the format of <code>messages.json</code> files. 343For information on how to internationalize and localize your extension, 344see the <a href="i18n.html">Internationalization</a> page. 345</p> 346 347<h2 id="overview"> Field summary </h2> 348 349<p> 350The following code shows the supported fields for 351<code>messages.json</code>. 352Only the "<em>name</em>" and "message" fields are required. 353</p> 354 355<pre>{ 356 "<a href="#name"><em>name</em></a>": { 357 "<a href="#message">message</a>": "<em>Message text, with optional placeholders.</em>", 358 "<a href="#description">description</a>": "<em>Translator-aimed description of the message.</em>", 359 "<a href="#placeholders">placeholders</a>": { 360 "<em>placeholder_name</em>": { 361 "content": "<em>A string to be placed within the message.</em>", 362 "example": "<em>Translator-aimed example of the placeholder string.</em>" 363 }, 364 ... 365 } 366 }, 367 ... 368} 369</pre> 370 371<h2 id="example"> Example </h2> 372 373<p> 374Here's a <code>messages.json</code> file 375that defines three messages 376named "prompt_for_name", "hello", and "bye": 377</p> 378 379<pre>{ 380 "prompt_for_name": { 381 "message": "What's your name?", 382 "description": "Ask for the user's name" 383 }, 384 "hello": { 385 "message": "Hello, $USER$", 386 "description": "Greet the user", 387 "placeholders": { 388 "user": { 389 "content": "$1", 390 "example": "Cira" 391 } 392 } 393 }, 394 "bye": { 395 "message": "Goodbye, $USER$. Come back to $OUR_SITE$ soon!", 396 "description": "Say goodbye to the user", 397 "placeholders": { 398 "our_site": { 399 "content": "Example.com", 400 }, 401 "user": { 402 "content": "$1", 403 "example": "Cira" 404 } 405 } 406 } 407} 408</pre> 409 410 411<a name="H2-2"></a><h2>Field details</h2> 412 413<p> 414This section describes each field 415that can appear in a <code>messages.json</code> file. 416For details on how the messages file is used — 417for example, what happens when a locale doesn't define 418all the messages — 419see <a href="i18n.html">Internationalization</a>. 420</p> 421 422 423<h3 id="name">name</h3> 424 425<p> 426Actually, there's no field called "name". 427This field's name is the name of the message — 428the same <em>name</em> that you see in 429<code>__MSG_<em>name</em>__</code> 430or <code>getMessage("<em>name</em>")</code>. 431</p> 432 433<p> 434The name is a case-insensitive key 435that lets you retrieve the localized message text. 436The name can include the following characters: 437</p> 438 439<ul> 440 <li> A-Z </li> 441 <li> a-z </li> 442 <li> 0-9 </li> 443 <li> _ (underscore) </li> 444 <li> @ </li> 445</ul> 446 447<p class="note"> 448<b>Note:</b> 449Don't define names that begin with "@@". 450Those names are reserved for 451<a href="i18n.html#overview-predefined">predefined messages</a>. 452</p> 453 454<p> 455Here are three examples of names, 456taken from the <a href="#example">Example</a> section: 457</p> 458 459<pre>"prompt_for_name": { 460 ... 461}, 462"hello": { 463 ... 464}, 465"bye": { 466 ... 467} 468</pre> 469 470<p> 471For more examples of using names, see the 472<a href="i18n.html">Internationalization</a> page. 473</p> 474 475 476<h3 id="message">message</h3> 477 478<p> 479The translated message, 480in the form of a string that can contain 481<a href="#placeholders">placeholders</a>. 482Use <code>$<em>placeholder_name</em>$</code> 483(case insensitive) 484to refer to a particular placeholder. 485For example, you can refer to a placeholder named "our_site" as 486<code>$our_site$</code>, <code>$OUR_SITE$</code>, or <code>$oUR_sITe$</code>. 487</p> 488 489<p> 490Here are three examples of messages, 491taken from the <a href="#example">Example</a> section: 492</p> 493 494<pre>"message": "What's your name?" 495... 496"message": "Hello, $USER$" 497... 498"message": "Goodbye, $USER$. Come back to $OUR_SITE$ soon!" 499</pre> 500 501<p> 502To put a dollar sign (<code>$</code>) into the string, 503use <code>$$</code>. 504For example, use the following code to specify the message 505<b>Amount (in $)</b>: 506 507</p><pre>"message": "Amount (in $$)" 508</pre> 509 510<p> 511Although placeholders such as <code>$USER$</code> are 512the preferred way of referring to <em>substitution strings</em> 513(strings specified using the <em>substitutions</em> parameter of 514<a href="i18n.html#method-getMessage"><code>getMessage()</code></a>) 515you can also refer to substitution strings directly 516within the message. 517For example, the following message 518refers to the first three substitution strings passed into 519<code>getMessage()</code>: 520</p> 521 522<pre>"message": "Params: $1, $2, $3" 523</pre> 524 525<p> 526Despite that example, 527we recommend that you stick to using placeholders 528instead of <code>$<em>n</em></code> strings 529within your messages. 530Think of placeholders as good variable names. 531A week after you write your code, 532you'll probably forget what <code>$1</code> refers to, 533but you'll know what your placeholders refer to. 534For more information on placeholders and substitution strings, see 535the <a href="#placeholders">placeholders</a> section. 536</p> 537 538<h3 id="description">description</h3> 539 540<p> 541<em>Optional.</em> 542A description of the message, 543intended to give context 544or details to help the translator 545make the best possible translation. 546</p> 547 548<p> 549Here are three examples of descriptions, 550taken from the <a href="#example">Example</a> section: 551</p> 552 553<pre>"description": "Ask for the user's name" 554... 555"description": "Greet the user" 556... 557"description": "Say goodbye to the user" 558</pre> 559 560<h3 id="placeholders">placeholders</h3> 561 562<p> 563<em>Optional.</em> 564Defines one or more substrings 565to be used within the message. 566Here are two reasons you might want to use a placeholder: 567</p> 568 569<ul> 570 <li> 571 To define the text 572 for a part of your message 573 that shouldn't be translated. 574 Examples: HTML code, trademarked names, formatting specifiers. 575 </li> 576 <li> 577 To refer to a substitution string passed into 578 <code>getMessage()</code>. 579 Example: <code>$1</code>. 580 </li> 581</ul> 582 583<p> 584Each placeholder has a name, 585a "content" item, 586and an optional "example" item. 587A placeholder's name is case-insensitive 588and can contain the same characters 589as a <a href="#name">message name</a>. 590</p> 591 592<p> 593The "content" item's value is a string 594that can refer to substitution strings, which are 595specified using the 596<a href="i18n.html#method-getMessage"><code>getMessage()</code></a> method's 597<em>substitutions</em> parameter. 598The value of a "content" item is typically something like 599"Example.com" or "$1". 600If you refer to 601a substitution string that doesn't exist, 602you get an empty string. 603The following table shows how 604<code>$<em>n</em></code> strings correspond to 605strings specified by the <em>substitutions</em> parameter. 606</p> 607 608<table> 609<tbody><tr> 610<th> <em>substitutions</em> parameter </th> 611<th> Value of $1</th> 612<th> Value of $2</th> 613<th> Value of $3</th> 614</tr> 615<tr> 616 <td> <code>userName</code> </td> 617 <td> value of <code>userName</code> </td> 618 <td> <code>""</code> </td> 619 <td> <code>""</code> </td> 620</tr> 621<tr> 622 <td> <code>["Cira", "Kathy"]</code> </td> 623 <td> <code>"Cira"</code> </td> 624 <td> <code>"Kathy"</code> </td> 625 <td> <code>""</code> </td> 626</tr> 627</tbody></table> 628 629<p> 630The "example" item 631(optional, but highly recommended) 632helps translators by showing how the content appears to the end user. 633For example, a placeholder 634for a dollar amount 635should have an example like <code>"$23.45"</code>. 636</p> 637 638<p> 639The following snippet, 640taken from the <a href="#example">Example</a> section, 641shows a "placeholders" item that contains two placeholders 642named "our_site" and "user". 643The "our_site" placeholder has no "example" item 644because its value is obvious from the "content" field. 645</p> 646 647<pre>"placeholders": { 648 "our_site": { 649 "content": "Example.com", 650 }, 651 "user": { 652 "content": "$1", 653 "example": "Cira" 654 } 655} 656</pre> 657 658 659 660</div> 661 662 <!-- API PAGE --> 663 <div class="apiPage" style="display: none; "> 664 <a name="apiReference"></a> 665 <h2>API reference: chrome.apiname </h2> 666 667 <!-- PROPERTIES --> 668 <div class="apiGroup"> 669 <a name="properties"></a> 670 <h3 id="properties">Properties</h3> 671 672 <div> 673 <a></a> 674 <h4>getLastError</h4> 675 <div class="summary"> 676 <!-- Note: intentionally longer 80 columns --> 677 <span>chrome.extension</span><span>lastError</span> 678 </div> 679 <div> 680 </div> 681 </div> 682 683 </div> <!-- /apiGroup --> 684 685 <!-- METHODS --> 686 <div id="methodsTemplate" class="apiGroup"> 687 <a></a> 688 <h3>Methods</h3> 689 690 <!-- iterates over all functions --> 691 <div class="apiItem"> 692 <a></a> <!-- method-anchor --> 693 <h4>method name</h4> 694 695 <div class="summary"><span>void</span> 696 <!-- Note: intentionally longer 80 columns --> 697 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 698 <var><span></span></var></span>)</div> 699 700 <div class="description"> 701 <p class="todo">Undocumented.</p> 702 <p> 703 A description from the json schema def of the function goes here. 704 </p> 705 706 <!-- PARAMETERS --> 707 <h4>Parameters</h4> 708 <dl> 709 <div> 710 <div> 711 </div> 712 </div> 713 </dl> 714 715 <!-- RETURNS --> 716 <h4>Returns</h4> 717 <dl> 718 <div> 719 <div> 720 </div> 721 </div> 722 </dl> 723 724 <!-- CALLBACK --> 725 <div> 726 <div> 727 <h4>Callback function</h4> 728 <p> 729 The callback <em>parameter</em> should specify a function 730 that looks like this: 731 </p> 732 <p> 733 If you specify the <em>callback</em> parameter, it should 734 specify a function that looks like this: 735 </p> 736 737 <!-- Note: intentionally longer 80 columns --> 738 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 739 <dl> 740 <div> 741 <div> 742 </div> 743 </div> 744 </dl> 745 </div> 746 </div> 747 748 <!-- MIN_VERSION --> 749 <p> 750 This function was added in version <b><span></span></b>. 751 If you require this function, the manifest key 752 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 753 can ensure that your extension won't be run in an earlier browser version. 754 </p> 755 </div> <!-- /description --> 756 757 </div> <!-- /apiItem --> 758 759 </div> <!-- /apiGroup --> 760 761 <!-- EVENTS --> 762 <div id="eventsTemplate" class="apiGroup"> 763 <a></a> 764 <h3>Events</h3> 765 <!-- iterates over all events --> 766 <div class="apiItem"> 767 <a></a> 768 <h4>event name</h4> 769 770 <div class="summary"> 771 <!-- Note: intentionally longer 80 columns --> 772 <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>); 773 </div> 774 775 <div class="description"> 776 <p class="todo">Undocumented.</p> 777 <p> 778 A description from the json schema def of the event goes here. 779 </p> 780 781 <!-- PARAMETERS --> 782 <div> 783 <h4>Parameters</h4> 784 <dl> 785 <div> 786 <div> 787 </div> 788 </div> 789 </dl> 790 </div> 791 </div> <!-- /decription --> 792 793 </div> <!-- /apiItem --> 794 795 </div> <!-- /apiGroup --> 796 797 <!-- TYPES --> 798 <div class="apiGroup"> 799 <a name="types"></a> 800 <h3 id="types">Types</h3> 801 802 <!-- iterates over all types --> 803 <div class="apiItem"> 804 <a></a> 805 <h4>type name</h4> 806 807 <div> 808 </div> 809 810 </div> <!-- /apiItem --> 811 812 </div> <!-- /apiGroup --> 813 814 </div> <!-- /apiPage --> 815 </div> <!-- /gc-pagecontent --> 816 </div> <!-- /g-section --> 817 </div> <!-- /codesiteContent --> 818 <div id="gc-footer" --=""> 819 <div class="text"> 820 <p> 821 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 822 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 823 Attribution 3.0 License</a>, and code samples are licensed under the 824 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 825 </p> 826 <p> 827 ©2011 Google 828 </p> 829 830<!-- begin analytics --> 831<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 832<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 833 834<script type="text/javascript"> 835 // chrome doc tracking 836 try { 837 var engdocs = _gat._getTracker("YT-10763712-2"); 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