Core: Documenting $.ui.keyCode. Fixes jquery#139.

Author: tjvantoll

entries/keyCode.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0"?>
+<entry type="property" name="keyCode" return="Object">
+	<title>.keyCode</title>
+	<desc>A mapping of key code descriptions to their numeric values.</desc>
+	<longdesc>
+		<p><code>$.ui.keyCode</code> is an object that maps key code descriptions to their corresponding numerical values. The object contains the following properties:</p>
+		<ul>
+			<li>BACKSPACE</li>
+			<li>COMMA</li>
+			<li>DELETE</li>
+			<li>DOWN</li>
+			<li>END</li>
+			<li>ENTER</li>
+			<li>ESCAPE</li>
+			<li>HOME</li>
+			<li>LEFT</li>
+			<li>PAGE_DOWN</li>
+			<li>PAGE_UP</li>
+			<li>PERIOD</li>
+			<li>RIGHT</li>
+			<li>SPACE</li>
+			<li>TAB</li>
+			<li>UP</li>
+		</ul>
+	</longdesc>
+	<example>
+		<desc>Test for arrow key presses.</desc>
+		<code><![CDATA[$( document ).on( "keydown", function( event ) {
+    switch( event.keyCode ) {
+        case $.ui.keyCode.LEFT:
+            console.log( "left" );
+            break;
+        case $.ui.keyCode.RIGHT:
+            console.log( "right" );
+            break;
+        case $.ui.keyCode.UP:
+            console.log( "up" );
+            break;
+        case $.ui.keyCode.DOWN:
+            console.log( "down" );
+            break;
+    }
+});]]></code>
+	</example>
+	<category slug="ui-core"/>
+</entry>