Added the URL JS helper file

assets/js/utils/url.js

@@ -0,0 +1,69 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2020, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.5.0
+ * ---------------------------------------------------------------------------- */
+
+window.App.Utils.Url = (function () {
+    /**
+     * Get complete URL of the provided URI segment.
+     *
+     * @param {String} uri
+     *
+     * @return {String}
+     */
+    function baseUrl(uri) {
+        return `${App.Config.base_url}/${uri}`;
+    }
+
+    /**
+     * Get the complete site URL (including the index.php) of the provided URI segment.
+     *
+     * @param {String} uri
+     *
+     * @returns {String}
+     */
+    function siteUrl(uri) {
+        return `${App.Config.base_url}${App.Config.index_page ? '/' + App.Config.index_page : ''}/${uri}`;
+    }
+
+    /**
+     * Retrieve a query parameter from the current request.
+     *
+     * @link http://www.netlobo.com/url_query_string_javascript.html
+     *
+     * @param {String} name Parameter name.
+
+     * @return {String} Returns the parameter value.
+     */
+    function queryParam(name) {
+        const url = location.href;
+
+        const parsedUrl = url.substr(url.indexOf('?')).slice(1).split('&');
+
+        for (let index in parsedUrl) {
+            const parsedValue = parsedUrl[index].split('=');
+
+            if (parsedValue.length === 1 && parsedValue[0] === name) {
+                return '';
+            }
+
+            if (parsedValue.length === 2 && parsedValue[0] === name) {
+                return decodeURIComponent(parsedValue[1]);
+            }
+        }
+
+        return null;
+    }
+
+    return {
+        baseUrl,
+        siteUrl,
+        queryParam
+    };
+})();