refactored javascript to ES6 classes (#759)

assets/js/plugins/KimaiAPI.js

@@ -0,0 +1,34 @@
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/*!
+ * [KIMAI] KimaiToolbar: some event listener to handle the toolbar/data-table filter, toolbar and navigation
+ */
+
+import jQuery from 'jquery';
+import KimaiPlugin from "../KimaiPlugin";
+
+export default class KimaiAPI extends KimaiPlugin {
+
+    getId() {
+        return 'api';
+    }
+
+    get(url, callback) {
+        jQuery.ajax({
+            url: url,
+            headers: {
+                'X-AUTH-SESSION': true,
+                'Content-Type':'application/json'
+            },
+            method: 'GET',
+            dataType: 'json',
+            success: callback
+        });
+    }
+
+}