> For the complete documentation index, see [llms.txt](https://learnpython.strivemath.com/p5-python-web/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learnpython.strivemath.com/p5-python-web/reference/events/mouse/keyboard-4.md).

# mouseWheel()

## Example

<figure><img src="/files/6jPPgvnAHxHvTz9t2KYI" alt=""><figcaption><p>When the mouse wheel is scrolled</p></figcaption></figure>

## Syntax

```
def mouseWheel([event]):
    # do stuff
    # work with event with property delta, like event.delta
```

<details>

<summary>Full Code Example</summary>

```python
```

</details>

## Description

This function is called any time a **vertical mouse wheel** event is detected, either triggered by rolling an actual mouse wheel or by a touchpad.

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