Revert "js: Do not handle anchor jumps, the browser is able to do it by itself"

This reverts commit 5ccd4a9ef8.

refs #8615

public/js/icinga/events.js

@@ -322,6 +322,21 @@
             return false;
         },
 
+        /**
+         * Handle anchor, i.e. focus the element which is referenced by the anchor
+         *
+         * @param {string} query jQuery selector
+         */
+        handleAnchor: function(query) {
+            var $element = $(query);
+            if ($element.length > 0) {
+                if (typeof $element.attr('tabindex') === 'undefined') {
+                    $element.attr('tabindex', -1);
+                }
+                $element.focus();
+            }
+        },
+
         /**
          * Someone clicked a link or tr[href]
          */
@@ -382,15 +397,17 @@
                 return;
             }
 
-            // This is an anchor only
-            if (href.substr(0, 1) === '#' && href.length > 1 && href.substr(1, 1) !== '!') {
-                return;
-            }
-
             // Handle all other links as XHR requests
             event.stopPropagation();
             event.preventDefault();
 
+            // This is an anchor only
+            if (href.substr(0, 1) === '#' && href.length > 1
+                && href.substr(1, 1) !== '!') {
+                self.handleAnchor(href);
+                return;
+            }
+
             // activate spinner indicator
             if ($a.hasClass('spinner')) {
                 $a.addClass('active');