Peter Lubbers - Pro HTML 5 Programming

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156 CHAPTER 6 ■ USING THE HTML5 WEBSOCKET API That’s it. Bi-directional browser communication made simple. For completeness, Listing 6-8 shows the entire HTML page with the WebSocket code. Listing 6-8. websocket.html code WebSocket Test Page var log = function(s) { if (document.readyState !== "complete") { log.buffer.push(s); } else { document.getElementById("output").innerHTML += (s + "\n"); } } log.buffer = []; url = "ws://localhost:8080/echo"; w = new WebSocket(url); w.onopen = function() { log("open"); w.send("thank you for accepting this WebSocket request"); } w.onmessage = function(e) { log(e.data); } w.onclose = function(e) { log("closed"); } window.onload = function() { log(log.buffer.join("\n")); document.getElementById("sendButton").onclick = function() { w.send(document.getElementById("inputMessage").value); } } Send Running the WebSocket Page To test the websocket.html page that contains the WebSocket code, open a command prompt, navigate to the folder that contains the WebSocket code, and issue the following command to host the HTML file: python -m SimpleHTTPServer 9999
CHAPTER 6 ■ USING THE HTML5 WEBSOCKET API Next, open another command prompt, navigate to the folder that contains the WebSocket code, and issue the following command to run the Python WebSocket server: python websocket.py Finally, open a browser that supports WebSockets natively and navigate to http://localhost:9999/websocket.html. Figure 6-6 shows the web page in action. Figure 6-6. websocket.html in action The example code folder also contains a web page that connects to the broadcast service that was created in the previous section. To see that action, close the command prompt that is running the WebSocket server and navigate to the folder that contains the WebSocket code, and issue the following command to run the python WebSocket server. python broadcast.py Open two separate browsers that supports WebSockets natively and navigate (in each browser) to http://localhost:9999/broadcast.html. Figure 6-7 shows the broadcast WebSocket server in action on two separate web pages. 157
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THE EXPERT’S VOICE ® IN WEB DEVE
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■ ■ ■ Pro HTML5 Programming P
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For my beautiful wife, Vittoria, an
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Contents ■Foreword ..............
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■ CONTENTS Implementing Canvas Se
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■ CONTENTS Summary ..............
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■ CONTENTS Setting and Retrieving
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Foreword In June 2004, representati
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About the Technical Reviewer � Pa
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Introduction HTML5 is brand new. In
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C H A P T E R 1 ■ ■ ■ Overvie
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CHAPTER 1 ■ OVERVIEW OF HTML5 wit
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Interoperability Simplification CHA
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• MathML • Microdata • Server
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Figure 1-1. A page rendered in stan
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Table 1-2. New sectioning HTML5 ele
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CHAPTER 1 ■ OVERVIEW OF HTML5 Wit
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article { background-color: #eee; d
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Figure 1-2. An HTML5 page with all
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CHAPTER 1 ■ OVERVIEW OF HTML5 The
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Figure 1-3. Developer Tools view in
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CHAPTER 1 ■ OVERVIEW OF HTML5 All
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26 CHAPTER 2 ■ USING THE HTML5 CA
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C H A P T E R 3 ■ ■ ■ Working
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Audio and Video Codecs CHAPTER 3
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Table 3-1. Browser support for HTML
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MEDIA FOR EVERYONE CHAPTER 3 ■ WO
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CHAPTER 3 ■ WORKING WITH HTML5 AU
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Table 3-4 shows a few of the read-o
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find the actual frame since the vid
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LOSING VIEWERS IN THE OF AN EYE CH
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C H A P T E R 4 ■ ■ ■ Using t
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A device can use any of the followi
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Table 4-4. Pros and cons of cell ph
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Figure 4-1. HTML5 Geolocation brows
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CHAPTER 4 ■ USING THE HTML5 GEOLO
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Listing 4-6. The Haversine formula
Page 125 and 126: Listing 4-9. Adding the loadDemo()
Page 127 and 128: THE EASIEST WAY TO TRAVEL CHAPTER 4
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Page 131 and 132: Practical Extras CHAPTER 4 ■ USIN
Page 133 and 134: Show Me on a Google Map CHAPTER 4
Page 135 and 136: C H A P T E R 5 ■ ■ ■ Using t
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Page 145 and 146: Send Notification CHAPTER 5 ■ U
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244 CHAPTER 10 ■ CREATING HTML5 O
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C H A P T E R 11 ■ ■ ■ The Fu
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Figure 11-1. Quake II 3D Shaders CH
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CHAPTER 11 ■ THE FUTURE OF HTML5
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270 ■ INDEX unsupported, 68 using
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274 ■ INDEX Web SQL database supp
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276 ■ INDEX HTML5 page CSS file f
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278 ■ INDEX media elements. See a
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280 ■ INDEX building application
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284 ■ INDEX stopping Web Workers,
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Peter Lubbers - Pro HTML 5 Programming

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