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188 <h1 class="page_title">Packaged Apps</h1> | |
189 </div> | |
190 <!-- TABLE OF CONTENTS --> | |
191 <div id="toc"> | |
192 <h2>Contents</h2> | |
193 <ol> | |
194 <li> | |
195 <a href="#overview">Overview</a> | |
196 <ol> | |
197 </ol> | |
198 </li><li> | |
199 <a href="#manifest"> The manifest </a> | |
200 <ol> | |
201 </ol> | |
202 </li><li> | |
203 <a href="#next">What next?</a> | |
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212 <div id="static"><div id="pageData-name" class="pageData">Packaged Apps<
/div> | |
213 <div id="pageData-showTOC" class="pageData">true</div> | |
214 <p> | |
215 This page talks about packaged apps—how | |
216 you implement them, | |
217 and how they're different from | |
218 extensions and ordinary web apps. | |
219 </p> | |
220 <h2 id="overview">Overview</h2> | |
221 <p> | |
222 A packaged app is a web app | |
223 that's bundled into a <code>.crx</code> file | |
224 and can use Chrome extension features. | |
225 You build a packaged app just like you build an extension, | |
226 except that a packaged app can't include a | |
227 <a href="browserAction.html">browser action</a> or | |
228 <a href="pageAction.html">page action</a>. | |
229 Instead, a packaged app includes at least one HTML file | |
230 within its <code>.crx</code> file | |
231 that provides the app's user interface. | |
232 </p> | |
233 <p> | |
234 Packaged apps are a type of | |
235 <a href="http://code.google.com/chrome/apps/">installable web app</a>—a | |
236 web app that can be installed in Chrome. | |
237 The other type of installable web app is a | |
238 <a href="http://code.google.com/chrome/apps/docs/developers_guide.html">hosted a
pp</a>, | |
239 which is an ordinary web app with a bit of additional metadata. | |
240 </p> | |
241 <p> | |
242 If you're developing a web app for the Chrome Web Store, | |
243 you might want to use a packaged app | |
244 instead of a hosted app if any of the following are true: | |
245 </p> | |
246 <ul> | |
247 <li> | |
248 You don't want to run a service to host your app. | |
249 </li> | |
250 <li> | |
251 You want to build an app that works really well offline. | |
252 </li> | |
253 <li> | |
254 You want tighter integration with Chrome, | |
255 using the extension APIs. | |
256 </li> | |
257 </ul> | |
258 <p> | |
259 To learn more about | |
260 the differences between web apps and websites, | |
261 extensions and packaged apps, and packaged apps and hosted apps, | |
262 read these: | |
263 </p> | |
264 <ul> | |
265 <li> <a href="http://code.google.com/chrome/webstore/docs/choosing.html">Choos
ing an App Type</a> </li> | |
266 <li> <a href="http://code.google.com/chrome/apps/articles/thinking_in_web_apps
.html">Thinking in Web Apps</a> </li> | |
267 <li> <a href="http://code.google.com/chrome/webstore/articles/apps_vs_extensio
ns.html">Extensions, Packaged Apps, and Hosted Apps in the Chrome Web Store</a>
</li> | |
268 </ul> | |
269 <h2 id="manifest"> The manifest </h2> | |
270 <p> | |
271 A packaged app's manifest can have any field | |
272 that's available to extensions, | |
273 except for "browser_action" and "page_action". | |
274 In addition, a packaged app's manifest <b>must</b> | |
275 have an "app" field. | |
276 Here is a typical manifest for a packaged app: | |
277 </p> | |
278 <pre>{ | |
279 "name": "My Awesome Racing Game", | |
280 "description": "Enter a world where a Vanagon can beat a Maserati", | |
281 "version": "1", | |
282 <b>"app": { | |
283 "launch": { | |
284 "local_path": "main.html" | |
285 } | |
286 },</b> | |
287 "icons": { | |
288 "16": "icon_16.png", | |
289 "128": "icon_128.png" | |
290 } | |
291 } | |
292 </pre> | |
293 <p> | |
294 The "app" field has one subfield, "launch", | |
295 which specifies the <em>launch page</em> for the app—the | |
296 page (HTML file bundled into the <code>.crx</code> file) | |
297 that the browser goes to when the user clicks the app's icon | |
298 in the New Tab page. | |
299 The "launch" field can contain the following: | |
300 </p> | |
301 <dl> | |
302 <dt>local_path:</dt> | |
303 <dd><em>Required.</em> | |
304 Specifies the launch page | |
305 as a relative path referring to a file | |
306 in the <code>.crx</code> package. | |
307 </dd> | |
308 <dt>container:</dt> | |
309 <dd> The value "panel" makes the app appear | |
310 in an app panel. | |
311 By default, or when you specify "tab", | |
312 the app appears in a tab. | |
313 <!-- PENDING: In the overview | |
314 (or somewhere else before here) | |
315 we should show and define both app panels and tabs. | |
316 We should link to that place from here. --> | |
317 </dd> | |
318 <dt>height:</dt> | |
319 <dd> | |
320 If the container is set to "panel", | |
321 this integer specifies the height | |
322 of the panel in pixels. | |
323 For example, you might specify | |
324 <code>"height":400</code>. | |
325 Note that you don't use quotation marks in the value. | |
326 This field specifies the height of the area | |
327 to display contents in; | |
328 window decorations add a few more pixels to the total height. | |
329 If the container isn't a panel, this field is ignored. | |
330 </dd> | |
331 <dt>width:</dt> | |
332 <dd> | |
333 Similar to "height", | |
334 but specifies the width of the panel. | |
335 </dd> | |
336 </dl> | |
337 <p> | |
338 Packaged apps usually provide a 16x16 icon | |
339 to be used as the favicon for | |
340 tabs that contain app's pages. | |
341 They also should provide a 128x128 icon, | |
342 but not a 48x48 icon. | |
343 See the manifest documentation for the | |
344 <a href="manifest.html#icons">"icons" field</a> | |
345 for more information. | |
346 </p> | |
347 <p> | |
348 For further details on what a packaged app's manifest can contain, see the | |
349 <a href="manifest.html">manifest documentation</a>. | |
350 </p> | |
351 <h2 id="next">What next?</h2> | |
352 <p> | |
353 Read the <a href="overview.html">Overview</a> to learn | |
354 basic concepts about extensions. | |
355 </p> | |
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