> For the complete documentation index, see [llms.txt](https://developers-apps-in-toss.toss.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers-apps-in-toss.toss.im/documentation/api-and-sdk-en/sdk/events/tdsevent.md).

# tdsEvent

### Feature description

Subscribe to TDS navigation bar events.

* `navigationAccessoryEvent` — When the navigation bar's accessory button is pressed, the pressed button's `{ id }`is passed. `partner.addAccessoryButton`is used to register the button (partner webview only — not in the public reference).

### Type

```ts
tdsEvent.addEventListener(
  event: "navigationAccessoryEvent",
  args: { onEvent: (data: { id: string }) => void; onError?: (error: Error) => void },
): () => void;
```

**Params**

* `event` — This is the event to subscribe to. Currently there is only `"navigationAccessoryEvent"`(navigation bar accessory button pressed).
* `args.onEvent: (data: { id: string }) => void` — Called together with the pressed button's `id`when the button is pressed.
* `args.onError?: (error: Error) => void` — Called when an error occurs while processing the subscription.

**Response**

Function that unsubscribes `() => void`is returned. When called, the listener is removed.

### Example code

```js
import { tdsEvent } from "@apps-in-toss/web-framework";

const unsubscribe = tdsEvent.addEventListener("navigationAccessoryEvent", {
  onEvent: ({ id }) => {
    if (id === "search") {
      openSearch();
    }
  },
});
```


---

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