Download PDF by Darren Cook: Data Push Apps with HTML5 SSE: Pragmatic Solutions for

By Darren Cook

ISBN-10: 1449371884

ISBN-13: 9781449371883

Verify your web site or internet program clients get content material updates without delay with minimum latency. This concise advisor indicates you ways to push new info from the server to consumers with HTML5 Server-Sent occasions (SSE), an excellent expertise that doesn’t require consistent polling or person interplay. You’ll easy methods to construct a real-world SSE software from begin to end that solves a tough area problem.

You’ll additionally observe how you can raise that application’s computing device and cellular browser aid from 60% to 99%, utilizing various fallback strategies. If you’re accustomed to HTML, HTTP, and easy JavaScript, you’re able to get started.

  • Determine no matter if SSE, WebSockets, or info pull is better to your organization
  • Develop a operating SSE software entire with backend and frontend solutions
  • Address mistakes dealing with, process restoration, and different matters to make the applying production-quality
  • Explore fallback ideas for browsers that don’t help SSE
  • Tackle defense concerns, together with authorization and "disallowed origin"
  • Develop practical, repeatable facts that’s worthwhile in test-driven SSE design
  • Learn SSE protocol parts no longer lined within the instance application
  • Show description

    Read or Download Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients PDF

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    Additional info for Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients

    Example text

    We could add a type field to change the meaning of rows, perhaps to say it is gzipped CSV, not a JSON array. It allows us to add a version number. 1 After all that chat, the code for the change is quite small; it only affects the gener ate() function in our FXPair class. %03d", ($t*1000)%1000); return array( "symbol" => $this->symbol, "timestamp" => $ts, "rows" => array( array( "timestamp" => $ts, "bid" => number_format($bid, $this->decimal_places), "ask" => number_format($ask, $this->decimal_places), ) ) ); In PHP, an array with named keys is called an associative ar‐ ray; it will become an object in the JSON.

    Because this is intended as a minimal example, I chose to ignore caching. Examples in other chapters will send headers that explicitly request no caching, just to be on the safe side (see “Cache Prevention” on page 82). One other thing to watch out for when using SSE is that the brows‐ er might kill the connection if it goes quiet. For instance, some ver‐ sions of the Chrome browser kill (and reopen) the connection af‐ ter 60 seconds. In our real applications we will deal with this (see “Adding Keep-Alive” on page 60).

    However, the SSE boilerplate code is so easy there is not much for JQuery to simplify. html in the book’s source code) spruces it up with a fade-out/fade-in animation each time. fadeIn("slow"); }); },false); Using JQuery? "\n\n"; @ob_flush();@flush(); sleep(1); } Just like the frontend code, this is wonderfully short, isn’t it? No libraries, no depen‐ dencies, just a few simple lines of vanilla PHP. And just like the frontend there is more we could be doing, but again it is all optional.

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    Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients by Darren Cook

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