# Sign up form
Source: https://signy.dev/examples/sign-up-form/
Validation that waits for you to leave a field, and a submit that waits for the server.
Each field keeps its value and whether it was touched in signals. Computed values hold the errors, so a message shows only after you leave the field or press submit. The fake server takes a second and rejects one user name, to show an error that comes back from it.
## Preview
[Open the page on its own](https://signy.dev/examples/sign-up-form/demo/index.html.md)
## Code
Save it as an `.html` file and open it in a browser. It loads Signy and Iris CSS from the CDN, so there is nothing to install or build.
**Show the full page**
```html
Sign up form - Signy example
```
## What it uses
- [Signals](https://signy.dev/documentation/1/reactivity/signals/index.html.md) per field and [Computed](https://signy.dev/documentation/1/reactivity/computed/index.html.md) errors
- [Refs](https://signy.dev/documentation/1/components/refs-and-forms/index.html.md) to focus the first invalid field
- `aria-invalid` and `aria-busy` bound to signals
- [Show](https://signy.dev/documentation/1/templates/show/index.html.md) for the messages