# Bottom Navigation

- Page: https://jiguang132.com/resources/material-ui/docs/bottom-navigation
- Resource: Material UI (https://jiguang132.com/resources/material-ui.md)
- All guides: https://jiguang132.com/resources/material-ui/docs.md

Switch between a small number of primary destinations on compact screens.

This guide covers Material UI Core with the default Emotion engine; extensions and additional demos are explicitly classified.

## Use case and business boundary

Selected values do not navigate by themselves; connect real routes without discarding native keyboard behavior.

## Native composition and scope

`BottomNavigation`, `BottomNavigationAction`

Preserve native Material UI composition and types; do not substitute JGuang UI/Base UI/Radix APIs. Example entries are not extra components.

## Native installation and initialization

```bash
npm install @mui/material@9.4.0 @emotion/react@11.14.0 @emotion/styled@11.14.1
```

Use native npm and Emotion, not an invented JGuang UI Registry URL. Place examples inside native ThemeProvider; choose CssBaseline or ScopedCssBaseline for the project. Inspect React, existing providers, lockfile and SSR first. Never overwrite files or conceal peer conflicts. This batch verified React 19.2.8; React 18 and below require matching react-is. See the included bilingual setup guide.

## Practical native parameters

These selected parameters are not a flattened universal API. Preserve the native declaring owner, slot structure, nullable values and generics.

| Owner.prop | Practical role | Declaration source |
| --- | --- | --- |
| `BottomNavigation.value` | Controlled native value; its scalar/array/nullable type is owner-specific. | `BottomNavigation` |
| `BottomNavigation.onChange` | Owning control's native callback; preserve its exact event/value/nullable signature. | `BottomNavigation` |
| `BottomNavigation.showLabels` | Keep every BottomNavigation label visible, not only the selected one. | `BottomNavigation` |
| `BottomNavigationAction.label` | Native visible label/content; not necessarily the underlying value. | `BottomNavigationAction` |

## Runnable native examples

Machine keys select example entries, not universal variant props. Native demo JSX/data stay unchanged; JGuang-authored acceptance fixtures are explicitly labelled.

- Bottom navigation · `SimpleBottomNavigation` · upstream native demo
- Bottom navigation with no label · `LabelBottomNavigation` · upstream native demo
- Fixed positioning · `FixedBottomNavigation` · upstream native demo

## Actual usage example

Unmodified pinned native demo; copy its required local helper files together.

```tsx
import * as React from 'react';
import Box from '@mui/material/Box';
import BottomNavigation from '@mui/material/BottomNavigation';
import BottomNavigationAction from '@mui/material/BottomNavigationAction';
import RestoreIcon from '@mui/icons-material/Restore';
import FavoriteIcon from '@mui/icons-material/Favorite';
import LocationOnIcon from '@mui/icons-material/LocationOn';

export default function SimpleBottomNavigation() {
  const [value, setValue] = React.useState(0);

  return (
    <Box sx={{ width: 500 }}>
      <BottomNavigation
        showLabels
        value={value}
        onChange={(event, newValue) => {
          setValue(newValue);
        }}
      >
        <BottomNavigationAction label="Recents" icon={<RestoreIcon />} />
        <BottomNavigationAction label="Favorites" icon={<FavoriteIcon />} />
        <BottomNavigationAction label="Nearby" icon={<LocationOnIcon />} />
      </BottomNavigation>
    </Box>
  );
}

```

## Example dependency boundaries

`react`, `@mui/material/Box`, `@mui/material/BottomNavigation`, `@mui/material/BottomNavigationAction`, `@mui/icons-material/Restore`, `@mui/icons-material/Favorite`, `@mui/icons-material/LocationOn`, `@mui/icons-material/Folder`, `@mui/material/CssBaseline`, `@mui/icons-material/Archive`, `@mui/material/Paper`, `@mui/material/List`, `@mui/material/ListItemButton`, `@mui/material/ListItemAvatar`, `@mui/material/ListItemText`, `@mui/material/Avatar`

Direct Icons/System/Utils example imports require their matching 9.4.0 packages. Relative data/helpers are part of the example closure, not extra components. Remote images and simulated operations do not supply a backend.

## Pinned upstream API metadata reference

These tables retain the upstream metadata, not a newly inferred generic type system. Conditional generics, inherited props and callback details are defined by the source declarations below. Theme defaults may override metadata defaults.

### BottomNavigation

```tsx
import BottomNavigation from '@mui/material/BottomNavigation';
import { BottomNavigation } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `component` | no | `elementType` | — |
| `onChange` | no | `func` | — |
| `showLabels` | no | `bool` | `false` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |
| `value` | no | `any` | — |



### BottomNavigationAction

```tsx
import BottomNavigationAction from '@mui/material/BottomNavigationAction';
import { BottomNavigationAction } from '@mui/material';
```

Native inheritance: `ButtonBase`. Parent/DOM props are not fabricated as additional own props.

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `unsupportedProp` | — |
| `classes` | no | `object` | — |
| `icon` | no | `node` | — |
| `label` | no | `node` | — |
| `showLabel` | no | `bool` | — |
| `slotProps` | no | `{ label?: func \| object, root?: func \| object }` | `{}` |
| `slots` | no | `{ label?: elementType, root?: elementType }` | `{}` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |
| `value` | no | `any` | — |


## Native source declarations

Declarations/imports are extracted from pinned source without flattening unions or external inheritance. Original English comments/types are source reference, not a claim of translated upstream prose. Shared types stay in their native packages.

### vendor/src/BottomNavigation/BottomNavigation.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { Theme } from '../styles';

import { OverridableComponent, OverrideProps } from '../OverridableComponent';

import { BottomNavigationClasses } from './bottomNavigationClasses';

export interface BottomNavigationOwnProps {
  /**
   * The content of the component.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<BottomNavigationClasses> | undefined;
  /**
   * Callback fired when the value changes.
   *
   * @param {React.SyntheticEvent} event The event source of the callback. **Warning**: This is a generic event not a change event.
   * @param {any} value We default to the index of the child.
   */
  onChange?: ((event: React.SyntheticEvent, value: any) => void) | undefined;
  /**
   * If `true`, all `BottomNavigationAction`s will show their labels.
   * By default, only the selected `BottomNavigationAction` will show its label.
   * @default false
   */
  showLabels?: boolean | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
  /**
   * The value of the currently selected `BottomNavigationAction`.
   */
  value?: any;
}

export interface BottomNavigationTypeMap<
  AdditionalProps = {},
  RootComponent extends React.ElementType = 'div',
> {
  props: AdditionalProps & BottomNavigationOwnProps;
  defaultComponent: RootComponent;
}

declare const BottomNavigation: OverridableComponent<BottomNavigationTypeMap>;

export type BottomNavigationProps<
  RootComponent extends React.ElementType = BottomNavigationTypeMap['defaultComponent'],
  AdditionalProps = {},
> = OverrideProps<BottomNavigationTypeMap<AdditionalProps, RootComponent>, RootComponent> & {
  component?: React.ElementType | undefined;
};
```

### vendor/src/BottomNavigationAction/BottomNavigationAction.d.ts

```ts
import * as React from 'react';

import { SxProps } from '@mui/system';

import { CreateSlotsAndSlotProps, SlotProps } from '../utils/types';

import { Theme } from '../styles';

import {
  ButtonBaseProps,
  ButtonBaseTypeMap,
  ExtendButtonBase,
  ExtendButtonBaseTypeMap,
} from '../ButtonBase';

import { OverrideProps } from '../OverridableComponent';

import { BottomNavigationActionClasses } from './bottomNavigationActionClasses';

export interface BottomNavigationActionSlots {
  /**
   * The component that renders the root.
   * @default ButtonBase
   */
  root: React.ElementType;
  /**
   * The component that renders the label.
   * @default span
   */
  label: React.ElementType;
}

export type BottomNavigationActionSlotsAndSlotProps = CreateSlotsAndSlotProps<
  BottomNavigationActionSlots,
  {
    /**
     * Props forwarded to the root slot.
     * By default, the available props are based on the ButtonBase element.
     */
    root: SlotProps<React.ElementType<ButtonBaseProps>, {}, BottomNavigationActionOwnerState>;
    /**
     * Props forwarded to the label slot.
     * By default, the available props are based on the span element.
     */
    label: SlotProps<'span', {}, BottomNavigationActionOwnerState>;
  }
>;

export interface BottomNavigationActionOwnProps extends BottomNavigationActionSlotsAndSlotProps {
  /**
   * This prop isn't supported.
   * Use the `component` prop if you need to change the children structure.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<BottomNavigationActionClasses> | undefined;
  /**
   * The icon to display.
   */
  icon?: React.ReactNode;
  /**
   * The label element.
   */
  label?: React.ReactNode;
  /**
   * If `true`, the `BottomNavigationAction` will show its label.
   * By default, only the selected `BottomNavigationAction`
   * inside `BottomNavigation` will show its label.
   *
   * The prop defaults to the value (`false`) inherited from the parent BottomNavigation component.
   */
  showLabel?: boolean | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
  /**
   * You can provide your own value. Otherwise, we fallback to the child position index.
   */
  value?: any;
}

export type BottomNavigationActionTypeMap<
  AdditionalProps,
  RootComponent extends React.ElementType,
> = ExtendButtonBaseTypeMap<{
  props: AdditionalProps & BottomNavigationActionOwnProps;
  defaultComponent: RootComponent;
}>;

declare const BottomNavigationAction: ExtendButtonBase<
  BottomNavigationActionTypeMap<{}, ButtonBaseTypeMap['defaultComponent']>
>;

export type BottomNavigationActionProps<
  RootComponent extends React.ElementType = ButtonBaseTypeMap['defaultComponent'],
  AdditionalProps = {},
> = OverrideProps<BottomNavigationActionTypeMap<AdditionalProps, RootComponent>, RootComponent> & {
  component?: React.ElementType | undefined;
};

export interface BottomNavigationActionOwnerState extends Omit<
  BottomNavigationActionProps,
  'slots' | 'slotProps'
> {}
```

## Post-install acceptance

Run strict types, production build and real interactions. Check keyboard labels/focus, disabled/error/read-only semantics where natively supported, both themes, narrow screens and reduced motion. Verify callbacks against the real host data; do not declare installation complete from copying a prompt. Initialization fixtures also require server HTML and warning-free hydration.

## Source and license

https://github.com/mui/material-ui/tree/809a7717b4c050ba3f69b75300689f07c050a16e

MIT · @mui/material@9.4.0. Vendor originals and license are preserved. Full original upstream prose remains in vendor/docs and is not represented as fully translated.

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