Gears 0.5.21.0 Released

5/28/2009 09:30:00 AM
Posted by Ian Fette, Gears Team

In conjunction with Google I/O we're releasing a new version of Gears, 0.5.21.0. This version includes minor bugfixes and three new features:

• Drag & Drop support for dragging files into a web page and letting the web page act on those files
• Image thumbnailing
• Blob builder API, which allows script to build binary blobs, including valid multi-part-form-encoded blobs that contain binary file parts, which can then be uploaded using Gears.HttpRequest

Documentation on http://code.google.com/apis/gears/ will be updated soon with more details about the new features.

WiFi-based geolocation, anyone?

10/21/2008 11:59:00 AM
Andrei Popescu, Gears Team

Guess what? The Gears Geolocation API got even better! We have just released a new version of Gears, 0.4.24.0, which contains an enhanced implementation of the Geolocation API. This new version uses WiFi access point signals to return significantly more accurate results, making it a lot more useful on laptop computers.

You can find more details about this release on the UK Google Code Blog.

Gears For Safari

9/15/2008 06:22:00 AM
Posted by Jeremy Moskovich and Matt Perry, Gears Engineers

We're really excited to announce the official release of Gears for Safari on OS X (minimum requirements are Leopard 10.5.3 or Tiger 10.4.11).

You can download it today from http://gears.google.com.

This means that you can now access all the Gears-enabled sites (such as Zoho office, WordPress, the new YouTube uploader and Google Docs offline) in Safari.

Since launch, we've increased the number of APIs available in Gears. The 0.3 release added the ability to create desktop shortcuts for websites, and the 0.4 release added Geolocation and Blobs (useful for resumable uploads of large files). All of these are now available in Safari and work exactly the same as on the other browsers Gears supports.

We thought it might be interesting to talk about some of the technical aspects of Gears peculiar to Safari and OS X. If you aren't a developer you can safely skip the following paragraphs and go straight to the download page.

When you install Gears, you'll notice that it's composed of 2 components: an NPAPI plugin which lives in "/Library/Internet Plugins" and an InputManager. Gears needs to load first thing upon browser startup, for cases in which the first page loaded into the browser is from the Gears offline cache. NPAPI provides no mechanism for loading that early (it only provides support for loading plugins the first time a page specifically includes them) so we needed a small InputManager to do the work for us.

For browsers other than Safari that use the WebKit engine, we've provided a really simple mechanism to allow them to load Gears into their program without using the InputManager. Fluid is one example of a 3rd party browser that supports Gears this way.

On the Mac, Gears desktop shortcuts are actually small applications that are designed to open the website in the same browser they were originally created from. This means that if you created them from a Fluid app they'll open in that same place and if you've got multiple versions of Firefox installed on your machine the shortcut will open in the right one.

We hope you've found this post interesting. If you have any feedback we'd love to hear from you on our mailing list.

Gears 0.4 is here!

8/22/2008 12:15:00 AM
Posted by Andrei Popescu, Gears Engineer

But where exactly is 'here'? Well, that's a question that takes on a whole new meaning with this new release of Gears: we have added a new Geolocation API, which allows you to build applications that can do new and exciting things based on your users' location. You can query Gears for the user's current location using the getCurrentPosition() method or you can ask Gears to notify you every time the location changes, using the watchPosition() method. Of course, we take privacy issues very seriously, which is why we have a special permission dialog that allows users to decide which Web sites should have access to their location information. If you want to learn more about how the Geolocation API works, please see the Google Code blog post.

Another cool new feature is the Blob API. Unlike strings, blobs let you reference arbitrary binary data — a first for JavaScript! Therefore, blobs can more naturally represent things like files and images, and they can be passed around efficiently. We have updated several existing APIs to work with blobs, such as WorkerPool sendMessage() and HttpRequest send(). And that's not all! We have also extended the Desktop API with a new method, openFiles(), which allows users to select multiple files of a particular content type, and then returns them as blobs for easy uploading or worker processing.

Other major changes in Gears 0.4 include:

• onprogress() events for HTTP downloads and uploads
  
• Gears dialogs localized to 40 languages
  

For the full list of changes, you can check out the Gears API history.

If you are a developer anxious to try these new APIs, first check gears.google.com to make sure you have Gears 0.4 installed (your browser should be updated automatically) and then browse the Gears documentation pages. If you are a mobile developer, please make sure you also read our Google Mobile blog post to learn more details about what devices support the Geolocation API.

Finally, an update on how we are doing on Web standards: in line with our earlier promises, the Geolocation API is a W3C Editor's draft and its current design is a result of open collaboration with many other people and organizations. We plan to continue to drive this standardization effort, as well work with the community on new Web standards.

Gears Best Practices

8/06/2008 02:46:00 PM
Posted by Brad Neuberg, Google Developer Programs

We are constantly asked what are best practices when working with Gears. For example, what's the best way to work with the local database for performance and reliability? What are good architectures for syncing and offline applications? We've just updated the Gears Developer FAQ with a whole slew of Best Practices, many with sample code that you can use in your own Gears-based applications. Here's a sampling of the new additions.

Best Practices for:

• Starting With Gears
• Offline Architectures
• Online/Offline Detection
• Gears Permissioning
• Installation and Detection
• Using LocalServer With Web Applications Spread Across Different Hosts
• Database Performance and Reliability
• Offline User Interfaces
• Maintainable Workers
• Choosing Names for Databases and LocalServers
• Storing Data on Users' Machines
• Desktop Shortcuts
• Versioning Database Schema
• LocalServer
• Syncing
• Giving Web Applications Similar Features to Desktop Applications

Have fun!

Creating a Client-Side Search Engine With Gears

7/14/2008 09:35:00 AM
Posted by Brad Neuberg, Gears Team

I've posted an in-depth article and tutorial on creating a client-side search engine with Gears. Here's a short snippet from the article:

Did you know that you can use Gears to do fast, client-side searching of data, similar to a client-side search engine? Gears bundles Full-Text Search (FTS) abilities right into its local, SQLite database. MySpace, for example, uses this feature with their MySpace Mail application, downloading all of a user's messages for fast, client-side search. Because all of the data is local, you can do nifty things like search over the data in real-time as the user types, something that is much harder if you have to query over the network to a server to do the searching.

Would you like to add the same kind of fast, local searching to your own web page and web applications? This article introduces you to PubTools Search and the Gears features that power it, namely Full-Text Search and Workers. PubTools Search is an open source JavaScript library that drops a client-side search engine right into your page. You configure it with basic HTML plus a list of URLs to index. Once loaded, a search form that uses the local Gears full-text search abilities will appear in your page to quickly and locally search over the documents in real time as a user types into the search field.

Please note that PubTools Search is not an official Google project or Gears API; it is a project I created on my own to teach and help developers. The Gears team does not support this project.

The article covers the following:

• An introduction to Gears' Full-Text Search and Worker features
• How to drop PubTools Search into your page to quickly get going
• Deep walkthrough and dissection of how PubTools Search works internally with source code and snippets so you can use these Gears features in your own applications
• An introduction to parts of the Dojo toolkit used in PubTools Search, using actual source from PubTools Search including a discussion on some of the techniques used in modern JavaScript development
• Tips and tricks when working with Gears

Read the full article and try the demo yourself!

Speeding Up WordPress With Gears

7/10/2008 05:09:00 PM
Posted by Brad Neuberg, Gears Team

WordPress.com just recently went live with Gears support for accelerating the user-interface, and the upcoming WordPress 2.6 release will also bundle Gears.

Andrew Ozz, a member of the WordPress team and the person responsible for the Gears integration wrote the following guest post on his experience working with Gears:

I thoroughly enjoyed working with Gears. After checking the excellent API documentation and examples, the test implementation of a ManagedResourceStore in WordPress was ready to go in about an hour.

After that I only had to refine the various status messages and user prompts and the first step of implementing Gears support in WordPress was ready for public testing. That was the fastest and easiest integration with another open source software I've had the opportunity to contribute to.

Currently WordPress implements Gears support in a somewhat "non-traditional" way. It uses only the local storage to cache all static files from the admin interface on the user's computer, eliminating needless requests to the server and improving page load speed, quite significantly in some cases.

Some of the limitations of this are that Gears prompts for permission on each sub-domain, so when a user has several blogs on WordPress.com, it will have to be enabled for each separately. Another is that although all files are served from the local storage in SSL mode, the browser reports that the web page is partially encrypted.

The Gears support is already live on WordPress.com, and is included in the next version of the self-hosted WordPress, that is due in a few days.

In my opinion Gears is more than an easy way to enable online applications to work offline. It extends the web browser into an OS independent application development platform. I won't be surprised to see some very different web enabled desktop applications built with it.