WebApp: Add checkAsync

TugasBesar2_2017/WebApp/src/main/webapp/js/converse.js

@@ -69,6 +69,15 @@ let converse = function ($http) {
   }
 
   class User extends Account {
+    async checkAsync (id) {
+      try {
+        await $http.get(`${apiUrl}/driver/${id}`)
+        return true
+      } catch (e) {
+        return false
+      }
+    }
+
     pickAsync (id) {
       let data = JSON.stringify({
         'user_id': id