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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 17-8 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 17-8 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>/** * DataEvent.js: send and receive ondataavailable events. * * This module defines two functions, DataEvent.send() and DataEvent.receive(), * for dispatching synthetic dataavailable events and registering event * handlers for those events. The code is written to work in Firefox and other * DOM-compliant browsers and also in IE. * * The DOM event model allows synthetic events of any type, but the IE model * supports only synthetic events of predefined types. dataavailable events * are the most generic predefined type supported by IE and are used here. * * Note that events dispatched with DataEvent.send() are not queued the way * real events would be. Instead, registered handlers are invoked immediately. */var DataEvent = {};/** * Send a synthetic ondataavailable event to the specified target. * The event object will include properties named datatype and data * that have the specified values. datatype is intended to be a string * or other primitive value (or null) identifying the type of this message, * and data can be any JavaScript value, including an object or array. */DataEvent.send = function(target, datatype, data) { if (typeof target == "string") target = document.getElementById(target); // Create an event object. If we can't create one, return silently if (document.createEvent) { // DOM event model // Create the event, specifying the name of the event module. // For a mouse event, we'd use "MouseEvents" var e = document.createEvent("Events"); // Initialize the event object, using a module-specific init method. // Here we specify the event type, bubbling, and noncancelable. // See Event.initEvent, MouseEvent.initMouseEvent, UIEvent.initUIEvent. e.initEvent("dataavailable", true, false); } else if (document.createEventObject) { // IE event model // In the IE event model, we just call this simple method var e = document.createEventObject(); } else return; // Do nothing in other browsers // Here we add some custom properties to the event object. // We could set existing properties as well. e.datatype = datatype; e.data = data; // Dispatch the event to the specified target if (target.dispatchEvent) target.dispatchEvent(e); // DOM else if (target.fireEvent) target.fireEvent("ondataavailable", e); // IE};/** * Register an event handler for an ondataavailable event on the specified * target element. */DataEvent.receive = function(target, handler) { if (typeof target == "string") target = document.getElementById(target); if (target.addEventListener) target.addEventListener("dataavailable", handler, false); else if (target.attachEvent) target.attachEvent("ondataavailable", handler);};</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; amazon_ad_width="300"; amazon_ad_height="250"; amazon_ad_logo="hide";</script><script type="text/javascript" src="../../www.assoc-amazon.com/s/ads.js" tppabs="http://www.assoc-amazon.com/s/ads.js"></script></div></body></html>?? 快捷鍵說明
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