By Darren Cook
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.
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Additional info for Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients
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);