Stay tuned for the next post where we'll talk about improving the performance of HTML5-based web applications.
We'll also be available at the Developer Sandbox and are looking forward to meeting you in person. That's all I'll show you for now, but you can look for more details about the Web Storage Portability Layer at Google I/O, May 27-28 in San Francisco where we'll be presenting a session on the architecture of a generic application using HTML5. You can also use SQL triggers to avoid the read-modify-write pattern that causes "ping ponging" between threads - either the main thread and Gears worker or the main thread and the HTML5 SQL thread. This can improve the responsiveness of your application if you're using long transactions.
Var statement = ('SELECT col from test_table ') ĭatabase.createTransaction(function(tx) ) I've found that using the Gears database asynchronously will nicely split up the JavaScript execution, allowing event handlers and other code to execute between the callbacks. Refer to the recent blog posts about AppCache to find steps you can follow to see your database contents using sqlite3. Var database = ('db name', ' You can then execute SQL statements without worrying about the specifics of HTML5 and Gears. Note that you'll need to provide a URL to the worker file hosted from your domain. Let's take a look at how we can use this API to perform a simple query, starting with the creation of a Database. Creates the appropriate HTML5 or Gears database implementation Name the file using your NetBIOS nameTest. A connection to the backing database, also provides transaction support Arrays of JavaScript hash objects, where the hash key is the table column name Used to execute one or more Statements with ACID properties It can be used to execute nested statements within callbacks, create statement templates, and optionally control the synchronous/asynchronous modes of the Gears Database Wrapper. The WSPL consists of a collection of classes that provide asynchronous transactional access to both Gears and HTML5 databases.
Coming soon under a liberal open source license to /p/webstorageportabilitylayer, WSPL provides a common API that supports an identical asynchronous programming model for both platforms by using a worker thread in Gears. We dealt with this problem by creating the Web Storage Portability Layer (WSPL) for Gmail. This difference makes it difficult to develop an application on top of both platforms. This week, I'll talk about how we're using both HTML5 Structured Storage and the Google Gears Database to make devices tolerate flaky network connections.Īlthough these technologies allow web applications to cache user data on the mobile device and perform data modifications locally, HTML5 Structured Storage uses an asynchronous model, where the Google Gears Database uses a synchronous model. We discussed the impact that AppCache can have on your mobile web applications, as you enable users to launch your app faster in the face of flaky or slow internet connections.
Over the last few weeks we've talked about how to use the AppCache functionality of HTML5 to launch an application offline.
We shared the behind-the-scenes story through this blog and decided to share more of our learnings in a brief series of follow up blog posts.
Now you can Enjoy free video chat with your friend.On April 7th, Google launched a new version of Gmail for mobile for iPhone and Android-powered devices. Now it should generate a MYId in his browser ask him to give it to you and past it in your chat windos OtherId textbox. Then you should see a json string in your My Id text box.Ĭopy that string and give it to your fried ask him to open the same link in his/her browerser(make sure there is no #init in his brower)Īsk him to past the json string in OterId box and click on connect (Please note some times it may take long for me it took 2 min once) Wait for a while so that it will generate a key for you.
It will create a node server to run in your local host.Ĭlick on Initialize if you want to initiate your chat. Make sure you have node.js or io.js installed in you system.įinally run bash npm i form your cloned directory. We used only javascript code with HTML5 apis to implement this. We tried to implement a simple peer to peer video chat with out any back end.
WebRTC (Web Real-Time Communication) is an API definition drafted by the World Wide Web Consortium (W3C) that supports browser-to-browser applications for voice calling, video chat, and P2P file sharing without the need of either internal or external plugins So what we did here? Its like a virtual peer who is validating your code while you are writing it. A simple html5 web-rtc peer to peer video chat. It provides JavaScript, TypeScript, Vue, React, and HTML code snippets.