JS: Introduce Icinga.Utils.addUrlFlag()

public/js/icinga/utils.js

@@ -210,6 +210,30 @@
             return params;
         },
 
+        /**
+         * Add the specified flag to the given URL
+         *
+         * @param {string} url
+         * @param {string} flag
+         *
+         * @returns {string}
+         */
+        addUrlFlag: function (url, flag) {
+            var pos = url.lastIndexOf('#');
+
+            if (url.indexOf('?') !== -1) {
+                flag = '&' + flag;
+            } else {
+                flag = '?' + flag;
+            }
+
+            if (pos === -1) {
+                return url + flag;
+            }
+
+            return url.slice(0, pos) + flag + url.slice(pos);
+        },
+
         /**
          * Check whether two HTMLElements overlap
          *