JS: Add autofocus behavior

refs #10671

public/js/icinga/behavior/autofocus.js

@@ -0,0 +1,24 @@
+/*! Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
+
+(function(Icinga, $) {
+
+    'use strict';
+
+    Icinga.Behaviors = Icinga.Behaviors || {};
+
+    var Autofocus = function (icinga) {
+        Icinga.EventListener.call(this, icinga);
+        this.on('rendered', this.onRendered, this);
+    };
+
+    Autofocus.prototype = new Icinga.EventListener();
+
+    Autofocus.prototype.onRendered = function(e) {
+        if (document.activeElement === document.body) {
+            $(e.target).find('.autofocus').focus();
+        }
+    };
+
+    Icinga.Behaviors.Autofocus = Autofocus;
+
+})(Icinga, jQuery);