# Handling Orientation Changes in Your Canvas App

The `orientation` event enables you to handle changes in orientation when your canvas app appears on a mobile device. After your canvas app subscribes to the event, the event fires whenever the parent window fires a `window.orientation` event. The event returns a payload that contains these values.

| Value          | Description                                                                                                                                                          |
| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `clientHeight` | The height of the app in pixels, specific to the device on which the canvas app renders                                                                              |
| `clientWidth`  | The width of the canvas app in pixels, specific to the device on which the canvas app renders                                                                        |
| `orientation`  | Contains one of these values.<ul><li>0: landscape to portrait</li><li>90: portrait to landscape</li><li>-90: portrait to landscape turned counterclockwise</li></ul> |

The following code example shows how to subscribe to the `orientation` event.

```java
// Capture the orientation event of the parent window.
Sfdc.canvas.client.subscribe(sr.client,
    {name : 'canvas.orientation', 
    onData : function (event) {
        console.log("Parent's orientation: " + event.orientation +
                    "Canvas app height: " + event.clientHeight +
                    "Canvas app width: " + event. clientWidth);
        }} );
});

```

:::note
The `orientation` event isn’t supported on Windows phones.
:::

**See Also**

- [Resizing a Canvas App](/docs/platform/canvas-framework/guide/canvas-app-resizing.md)
- [Subscribing to Parent Events](/docs/platform/canvas-framework/guide/canvas-app-subscribe-code-example.md)