> For the complete documentation index, see [llms.txt](https://docs.thndr.io/integration/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.thndr.io/integration/customisation/loading-screen.md).

# Loading Screen

When THNDR is embedded in your app, there is a gap between the iframe or webview rendering and the game being fully downloaded and initialised. During this time the host app sees a blank or partially rendered frame.

To cover this, you can show your own loading screen overlay on top of the embedded game. Once the game is ready, THNDR emits a `postMessage` so your app knows it is safe to dismiss the overlay.

#### postMessage event

Once the game has finished downloading and initialised, the widget emits the following message to the parent window:

```json
{
  "message": "operator_game_ready"
}
```

The message is sent as a JSON string. Parse `event.data` before checking the `message` field.

**Example listener**

```javascript
window.addEventListener("message", (event) => {
  let data;

  try {
    data = JSON.parse(event.data);
  } catch {
    return;
  }

  if (data?.message === "operator_game_ready") {
    // Hide or remove your loading screen overlay
    document.getElementById("loading-overlay").style.display = "none";
  }
});
```

#### Recommended approach

Show your loading overlay as soon as you render the iframe or webview. Keep it visible until `operator_game_ready` is received. This ensures the user sees a polished, controlled experience rather than the game loading in mid-render.

There is no timeout built into the widget. If you want to handle a slow connection gracefully, set your own timeout and decide how to handle it on the host side.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.thndr.io/integration/customisation/loading-screen.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.