Download Getting Started with HTML5 WebSocket Programming by Vangos Pterneas PDF

By Vangos Pterneas

Getting all started with HTML5 WebSocket Programming grants the genuine strength of bi-directional communique, applied through the use of the new HTML5 WebSocket API. You’ll easy methods to configure the server and consumers, how you can transmit kinds of information and the way to safe the full system.
This booklet will introduce you to the WebSocket global. we begin by way of introducing the WebSocket API, and proceed with sensible, real-world examples until eventually we will verify the right way to construct multi-functional internet apps for any kind of machine.

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Extra resources for Getting Started with HTML5 WebSocket Programming

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Com. packtpub. com/support and register to have the files e-mailed directly to you. [ 26 ] Configuring the Server WebSocket stands for bidirectional, full-duplex communication. As a result, we need two parties for this kind of conversation. In the previous chapter, we implemented the WebSocket client application. Now it's time to establish the other side of the channel, which is the WebSocket server. Why do I need a WebSocket server? We assume that you have a minor familiarity with servers in general.

Think of your users: it wouldn't be nice for them to surf on an unresponsive site. Moreover, you wouldn't like to miss any potential customers! As a result, you should check for browser compatibility before running any WebSocket code. If the browser cannot run the code, you should provide an error message or a fallback, such as AJAX or Flash-based functionality. There will be more on fallbacks in Chapter 6, Error Handling and Fallbacks. I also like providing messages that gently prompt my users to update their browser.

In order to display the blob in an image format, you need to decode it properly. The new JavaScript API makes basic image manipulation a piece of cake. Instead of reading the bytes, you create a plain URL to the specified data source. This URL is alive as long as the HTML document is alive. That means you cannot retrieve it after closing your browser window. webkitURL. The createObjectURL method generates a URL for the temporary file specified as a parameter. You do not need to provide any further details or write any further code!

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