> For the complete documentation index, see [llms.txt](https://jsf.gitbook.io/jsf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jsf.gitbook.io/jsf/schema/property-options/on-user-value-change.md).

# On user value change

This event is triggered whenever the user changes the prop value.

```typescript
interface onUserValueChange: {
            $eval: string;
          };
```