Programming Chrome Apps

Put your internet app layout talents to paintings by means of studying the best way to create robust and transportable Chrome Apps. With this functional ebook, you’ll tips on how to construct Google’s detailed apps to act similar to local apps to allow them to have interaction with units, entry exterior records, and ship notifications.

Author Marc Rochkind takes you thru a hands-on, goal journey of Chrome Apps, which run on any platform that helps the Chrome browser—including OS X, home windows, Linux, in addition to Android and iOS. in the event you understand how to paintings with HTML, CSS, JavaScript, and the DOM, you’re able to get started.

  • Learn tips on how to construct, run, and debug Chrome Apps step-by-step
  • Use Chrome Apps to entry neighborhood records, sync records, and exterior files
  • Take benefit of key-value-pair APIs, together with sync garage and IndexedDB
  • Use WebSockets, Google Cloud Messaging, and different networking methods
  • Display snap shots and pictures with Canvas, SVG, and the Media Galleries API
  • Use alarms, context menus, place, the digital camera, Bluetooth, USB, and different APIs
  • Publish apps to the Chrome internet shop with the Chrome Dev Editor

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Runtime. lastError. message + ')'); else if (items && goods. BackupFolderID) chrome. fileSystem. restoreEntry(items. BackupFolderID, functionality (entry) { directoryEntryBackup = access; show_backup_folder(); including Backup by utilizing Retained dossier Entries | fifty three } ); else setBackup(); } ); notice the decision to chrome. fileSystem. restoreEntry to get a DirectoryEntry again from the kept identification. If there’s no backup listing set, setBackup (which you simply observed) is termed to set it. this occurs while the app is first introduced; next launches locate that it’s already set. One toy-like hindrance of this instance is that there’s no listing tree within the backup listing, so records of a similar identify yet in several directories will overwrite one an‐ different. What it takes to mend this disorder is to take advantage of the total direction of the FileEntry to create all the wanted intermediate directories ahead of saving the backup, a role I depart to you. Here’s one other hindrance: there’s not just no auto-save, yet there’s no longer even a caution whilst the app exits. That’s probably not a great design—it’s greater to take advantage of the tactic that we utilized in the word app to save lots of immediately. simply because it’s a textual content editor, clients most likely count on shop and retailer As buttons, so that you can are looking to continue these. We’re no longer entire with our editor. In bankruptcy three, we’ll upload ideas to set the textual content colours in addition to a button with which the person can swap the backup listing. bankruptcy precis during this bankruptcy, we mentioned how you can use neighborhood records, Sync records, and exterior records utilizing HTML5 APIs and APIs detailed to Chrome Apps. Our exploration keeps in Chap‐ ter three with the key-value-pair APIs. fifty four | bankruptcy 2: neighborhood records, Sync records, and exterior documents CHAPTER three neighborhood garage, Sync garage, and IndexedDB This bankruptcy covers 3 extra garage varieties first brought in desk 2-1 in Chap‐ ter 2: neighborhood garage, Sync garage, and the IndexedDB database. All 3 shop keyvalue pairs (KVPs), no longer records. We’ll be extending the straightforward Editor app from bankruptcy 2, utilizing neighborhood and Sync garage. Then, I’ll introduce a mailing-list app to illustrate what you are able to do with IndexedDB. neighborhood and Sync garage Many browsers, together with Chrome, help localStorage, which is analogous to persis‐ tent cookies in that it shops KVPs. the most distinction is that localStorage has better skill and isn’t handed to the server besides HTTP requests. equally, consultation garage is the same to consultation cookies in that it lasts purely so long as the present consultation. although, Chrome Apps can’t use localStorage. in its place, there’s a Chrome API, chrome. garage. neighborhood, that’s higher: it will possibly shop JavaScript gadgets (localStorage is restricted to strings) and, like so much Chrome APIs, it operates asynchronously, permitting the app to be extra responsive. What’s extra, there’s a variation, chrome. garage. sync, with an identical API, that is instantly synchronized among desktops operating an analogous app, just like the best way that Sync records are synchronized. As is laid out in bankruptcy 2, you wish garage permission on your show up to exploit the chrome.

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