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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 17-6 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 17-6 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>/* * Keymap.js: bind key events to handler functions. * * This module defines a Keymap class. An instance of this class represents a * mapping of key identifiers (defined below) to handler functions. A * Keymap can be installed on an HTML element to handle keydown and keypress * events. When such an event occurs, the Keymap uses its mapping to invoke * the appropriate handler function. * * When you create a Keymap, pass a JavaScript object that represents the * initial set of bindings for the Keymap. The property names of this object * are key identifers, and the property values are the handler functions. * * After a Keymap has been created, you can add new bindings by passing a key * identifer and handler function to the bind() method. You can remove a * binding by passing a key identifier to the unbind() method. * * To make use of a Keymap, call its install() method, passing an HTML element, * such as the document object. install() adds an onkeypress and onkeydown * event handler to the specified object, replacing any handlers previously set * on those properties. When these handlers are invoked, they determine the * key identifier from the key event and invoke the handler function, if any, * bound to that key identifier. If there is no mapping for the event, it uses * the default handler function (see below), if one is defined. A single * Keymap may be installed on more than one HTML element. * * Key Identifiers * * A key identifier is a case-insensitive string representation of a key plus * any modifier keys that are held down at the same time. The key name is the * name of the key: this is often the text that appears on the physical key of * an English keyboard. Legal key names include "A", "7", "F2", "PageUp", * "Left", "Delete", "/", "~". For printable keys, the key name is simply the * character that the key generates. For nonprinting keys, the names are * derived from the KeyEvent.DOM_VK_ constants defined by Firefox. They are * simply the constant name, with the "DOM_VK_" portion and any underscores * removed. For example, the KeyEvent constant DOM_VK_BACK_SPACE becomes * BACKSPACE. See the Keymap.keyCodeToFunctionKey object in this module for a * complete list of names. * * A key identifier may also include modifier key prefixes. These prefixes are * Alt_, Ctrl_, and Shift_. They are case-insensitive, but if there is more * than one, they must appear in alphabetical order. Some key identifiers that * include modifiers include "Shift_A", "ALT_F2", and "alt_ctrl_delete". Note * that "ctrl_alt_delete" is not legal because the modifiers are not in * alphabetical order. * * Shifted punctuation characters are normally returned as the appopriate * character. Shift-2 generates a key identifier of "@", for example. But if * Alt or Ctrl is also held down, the unshifted symbol is used instead. * We get a key identifier of Ctrl_Shift_2 instead of Ctrl_@, for example. * * Handler Functions * * When a handler function is invoked, it is passed three arguments: * 1) the HTML element on which the key event occurred * 2) the key identifier of the key that was pressed * 3) the event object for the keydown event * * Default Handler * * The reserved key name "default" may be mapped to a handler function. That?? 快捷鍵說明
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