keyboard navigation: left/right

lib/ComicBook.js

@@ -48,7 +48,11 @@ function ComicBook(id, srcs, opts) {
 		zoomMode: "fitWidth",	// manual / fitWidth
 		manga: false,			// true / false
 		savePosition: true,		// true / false
-		enhance: {}
+		enhance: {},
+		keyboard: {
+			next: 78,
+			previous: 80
+		}
 	};
 	
 	var options = merge(defaults, opts); // options array for internal use
@@ -137,6 +141,7 @@ function ComicBook(id, srcs, opts) {
 		// add page controls
 		// TODO: add IE event listeners too.
 		canvas.addEventListener("click", ComicBook.prototype.navigation, false);
+		window.addEventListener("keydown", ComicBook.prototype.navigation, false);
 		window.addEventListener("hashchange", checkHash, false);
 		//setInterval(function() { checkHash(); }, 300); // TODO: enable this when there is no onhashchange event
 	}
@@ -455,13 +460,27 @@ function ComicBook(id, srcs, opts) {
 	};
 	
 	ComicBook.prototype.navigation = function (e) {
-	
-		if (e.type === "click") {
-			
-			var side = getCursorPosition(e);
-			
+		
+		var side;
+		
+		switch (e.type) {
+			case "click": 
+				side = getCursorPosition(e); 
+				break;
+			case "keydown": 
+				if (e.keyCode === options.keyboard.previous) { side = "left"; }
+				if (e.keyCode === options.keyboard.next) { side = "right"; }
+				break;
+			default:
+				throw "invalid navigation event: " + e.type;
+		}
+		
+		if (side) {
+		
+			e.stopPropagation();
+		
 			window.scroll(0,0); // make sure the top of the page is in view
-			
+		
 			// western style (left to right)
 			if (!options.manga) {
 				if (side === "left") { ComicBook.prototype.drawPrevPage(); }
@@ -472,6 +491,9 @@ function ComicBook(id, srcs, opts) {
 				if (side === "left") { ComicBook.prototype.drawNextPage(); }
 				if (side === "right") { ComicBook.prototype.drawPrevPage(); }
 			}
+		
+			return false;
 		}
 	};
+
 }