Introduce Language Category Display (LCD)

Introduce $.fn.lcd - displaying languages by categories.

Added the jquery.viewport.js module by Mika Tuupola (MIT license).

More tests for language utils.

Change-Id: I804b6da8ab0a2d518e17ae8bbd35e1c1da4bab3f

resources/jquery.viewport.js

@@ -0,0 +1,58 @@
+/*
+ * Viewport - jQuery selectors for finding elements in viewport
+ *
+ * Copyright (c) 2008-2009 Mika Tuupola
+ *
+ * Licensed under the MIT license:
+ *   http://www.opensource.org/licenses/mit-license.php
+ *
+ * Project home:
+ *  http://www.appelsiini.net/projects/viewport
+ *
+ */
+(function($) {
+    
+    $.belowthefold = function(element, settings) {
+        var fold = $(window).height() + $(window).scrollTop();
+        return fold <= $(element).offset().top - settings.threshold;
+    };
+
+    $.abovethetop = function(element, settings) {
+        var top = $(window).scrollTop();
+        return top >= $(element).offset().top + $(element).height() - settings.threshold;
+    };
+    
+    $.rightofscreen = function(element, settings) {
+        var fold = $(window).width() + $(window).scrollLeft();
+        return fold <= $(element).offset().left - settings.threshold;
+    };
+    
+    $.leftofscreen = function(element, settings) {
+        var left = $(window).scrollLeft();
+        return left >= $(element).offset().left + $(element).width() - settings.threshold;
+    };
+    
+    $.inviewport = function(element, settings) {
+        return !$.rightofscreen(element, settings) && !$.leftofscreen(element, settings) && !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
+    };
+    
+    $.extend($.expr[':'], {
+        "below-the-fold": function(a, i, m) {
+            return $.belowthefold(a, {threshold : 0});
+        },
+        "above-the-top": function(a, i, m) {
+            return $.abovethetop(a, {threshold : 0});
+        },
+        "left-of-screen": function(a, i, m) {
+            return $.leftofscreen(a, {threshold : 0});
+        },
+        "right-of-screen": function(a, i, m) {
+            return $.rightofscreen(a, {threshold : 0});
+        },
+        "in-viewport": function(a, i, m) {
+            return $.inviewport(a, {threshold : 0});
+        }
+    });
+
+    
+})(jQuery);