diff --git a/web/static/src/ts/services/ajax.ts b/web/static/src/ts/services/ajax.ts
index d2ebe59a..49ddf485 100644
--- a/web/static/src/ts/services/ajax.ts
+++ b/web/static/src/ts/services/ajax.ts
@@ -1,3 +1,5 @@
+import { EventBus } from "../core/event_bus";
+
 //------------------------------------------------------------------------------
 // Types
 //------------------------------------------------------------------------------
@@ -17,8 +19,11 @@ export interface RPCControllerQuery {
 
 export type RPCQuery = RPCModelQuery | RPCControllerQuery;
 
+type AjaxStatus = "loading" | "notloading";
+
 export interface IAjax {
   rpc(rpc: RPCQuery): Promise<any>;
+  on(event: "rpc_status", owner: any, callback: (status: AjaxStatus) => void);
 }
 
 interface RequestParameters {
@@ -32,16 +37,27 @@ export type FetchMethod = (route: string, params: any) => Promise<any>;
 // Ajax
 //------------------------------------------------------------------------------
 
-export class Ajax implements IAjax {
+export class Ajax extends EventBus implements IAjax {
   fetch: FetchMethod;
+  counter: number = 0;
 
   constructor(fetch: FetchMethod) {
+    super();
     this.fetch = fetch;
   }
 
-  rpc(rpc: RPCQuery): Promise<any> {
+  async rpc(rpc: RPCQuery): Promise<any> {
     const request = this.prepareRequest(rpc);
-    return this.fetch(request.route, request.params);
+    if (this.counter === 0) {
+      this.trigger("rpc_status", "loading");
+    }
+    this.counter++;
+    const result = await this.fetch(request.route, request.params);
+    this.counter--;
+    if (this.counter === 0) {
+      this.trigger("rpc_status", "notloading");
+    }
+    return result;
   }
 
   private prepareRequest(query: RPCQuery): RequestParameters {
diff --git a/web/static/tests/helpers.ts b/web/static/tests/helpers.ts
index 28320517..58667d67 100644
--- a/web/static/tests/helpers.ts
+++ b/web/static/tests/helpers.ts
@@ -1,14 +1,14 @@
 import { readFile } from "fs";
-import { Ajax, RPCQuery } from "../src/ts/services/ajax";
 import { WEnv } from "../src/ts/core/component";
 import { Callback } from "../src/ts/core/event_bus";
 import { NotificationManager } from "../src/ts/core/notifications";
 import { QWeb } from "../src/ts/core/qweb_vdom";
-import { actionRegistry } from "../src/ts/registries";
 import { IRouter, Query, RouterEvent } from "../src/ts/core/router";
 import { idGenerator } from "../src/ts/core/utils";
 import { getMenuInfo } from "../src/ts/init";
+import { actionRegistry } from "../src/ts/registries";
 import { ActionManager } from "../src/ts/services/action_manager";
+import { Ajax } from "../src/ts/services/ajax";
 import { MenuInfo } from "../src/ts/widgets/root";
 import { Env } from "../src/ts/widgets/widget";
 
diff --git a/web/static/tests/services/ajax.test.ts b/web/static/tests/services/ajax.test.ts
new file mode 100644
index 00000000..bc4095c1
--- /dev/null
+++ b/web/static/tests/services/ajax.test.ts
@@ -0,0 +1,37 @@
+import { Ajax } from "../../src/ts/services/ajax";
+import { nextMicroTick } from "../helpers";
+
+//------------------------------------------------------------------------------
+// Setup and helpers
+//------------------------------------------------------------------------------
+
+function mockFetch(route: string, params: any): Promise<any> {
+  return Promise.resolve(`${route}`);
+}
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+describe("parameters conversion", () => {
+  test("properly translate query in route", async () => {
+    const ajax = new Ajax(mockFetch);
+    const result = await ajax.rpc({ model: "test", method: "hey" });
+    expect(result).toBe("/web/dataset/call_kw/test/hey");
+  });
+});
+
+describe("event and status", () => {
+  test("trigger proper events", async () => {
+    const ajax = new Ajax(mockFetch);
+    const events: string[] = [];
+    ajax.on("rpc_status", null, s => {
+      events.push(s);
+    });
+    expect(events).toEqual([]);
+    ajax.rpc({ model: "test", method: "hey" });
+    expect(events).toEqual(["loading"]);
+    await nextMicroTick();
+    expect(events).toEqual(["loading", "notloading"]);
+  });
+});