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5 changes: 5 additions & 0 deletions .changeset/humble-jars-prove.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@radix-ui/react-navigation-menu": major
---

Fix missing data-state attribute on NavigationMenuContent when used with forceMount and NavigationMenuViewport
36 changes: 36 additions & 0 deletions apps/storybook/stories/navigation-menu.stories.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,42 @@ import styles from './navigation-menu.stories.module.css';

export default { title: 'Components/NavigationMenu' };

export const ForceMountWithViewport = () => {
return (
<StoryFrame>
<NavigationMenu.Root>
<NavigationMenu.List className={styles.mainList}>
<NavigationMenu.Item>
<TriggerWithIndicator>Products</TriggerWithIndicator>
{/* forceMount keeps content mounted; Viewport routes it via ViewportContentMounter */}
<NavigationMenu.Content
forceMount
className={styles.viewportContent}
style={{ width: 400 }}
>
<LinkGroup items={['Item One', 'Item Two', 'Item Three']} />
</NavigationMenu.Content>
</NavigationMenu.Item>

<NavigationMenu.Item>
<TriggerWithIndicator>Company</TriggerWithIndicator>
<NavigationMenu.Content
forceMount
className={styles.viewportContent}
style={{ width: 300 }}
>
<LinkGroup items={['About', 'Careers']} />
</NavigationMenu.Content>
</NavigationMenu.Item>
</NavigationMenu.List>

{/* Viewport is the key — this triggers the ViewportContentMounter path */}
<NavigationMenu.Viewport />
</NavigationMenu.Root>
</StoryFrame>
);
};

export const Basic = () => {
return (
<StoryFrame>
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8 changes: 7 additions & 1 deletion packages/react/navigation-menu/src/navigation-menu.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -764,6 +764,7 @@ const NavigationMenuContent = React.forwardRef<
const itemContext = useNavigationMenuItemContext(CONTENT_NAME, props.__scopeNavigationMenu);
const composedRefs = useComposedRefs(itemContext.contentRef, forwardedRef);
const open = itemContext.value === context.value;
const openState = getOpenState(open);

const commonProps = {
value: itemContext.value,
Expand Down Expand Up @@ -794,7 +795,12 @@ const NavigationMenuContent = React.forwardRef<
/>
</Presence>
) : (
<ViewportContentMounter forceMount={forceMount} {...commonProps} ref={composedRefs} />
<ViewportContentMounter
data-state={openState}
forceMount={forceMount}
{...commonProps}
ref={composedRefs}
/>
);
});

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