# Breadcrumbs

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

Explain page hierarchy and provide links to ancestor pages.

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

## Use case and business boundary

The host supplies hierarchy and routes; mark the current page and do not make every crumb a fake link.

## Native composition and scope

`Breadcrumbs`, `Link`, `Typography`

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 |
| --- | --- | --- |
| `Breadcrumbs.maxItems` | Maximum Breadcrumbs items before the native collapse affordance. | `Breadcrumbs` |
| `Breadcrumbs.separator` | Breadcrumbs' visual separator; do not use it as the accessible label. | `Breadcrumbs` |
| `Breadcrumbs.itemsBeforeCollapse` | Number of leading crumbs kept when Breadcrumbs collapses. | `Breadcrumbs` |
| `Breadcrumbs.itemsAfterCollapse` | Number of trailing crumbs kept when Breadcrumbs collapses. | `Breadcrumbs` |

## 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.

- Basic breadcrumbs · `BasicBreadcrumbs` · upstream native demo
- Active last breadcrumb · `ActiveLastBreadcrumb` · upstream native demo
- Custom separator · `CustomSeparator` · upstream native demo
- Breadcrumbs with icons · `IconBreadcrumbs` · upstream native demo
- Collapsed breadcrumbs · `CollapsedBreadcrumbs` · upstream native demo
- Condensed with menu · `CondensedWithMenu` · upstream native demo
- Customization · `CustomizedBreadcrumbs` · upstream native demo

## Explicitly unsupported additional examples

These remain in the upstream inventory, not silently skipped or presented as working previews. Additional dependency/framework acceptance is required.

- Integration with react-router · `RouterBreadcrumbs`: `react-router`

## Actual usage example

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

```tsx
import * as React from 'react';
import Typography from '@mui/material/Typography';
import Breadcrumbs from '@mui/material/Breadcrumbs';
import Link from '@mui/material/Link';

function handleClick(event: React.MouseEvent<HTMLDivElement, MouseEvent>) {
  event.preventDefault();
  console.info('You clicked a breadcrumb.');
}

export default function BasicBreadcrumbs() {
  return (
    <div role="presentation" onClick={handleClick}>
      <Breadcrumbs aria-label="breadcrumb">
        <Link underline="hover" color="inherit" href="/">
          MUI
        </Link>
        <Link
          underline="hover"
          color="inherit"
          href="/material-ui/getting-started/installation/"
        >
          Core
        </Link>
        <Typography sx={{ color: 'text.primary' }}>Breadcrumbs</Typography>
      </Breadcrumbs>
    </div>
  );
}

```

## Example dependency boundaries

`react`, `@mui/material/Typography`, `@mui/material/Breadcrumbs`, `@mui/material/Link`, `@mui/material/Stack`, `@mui/icons-material/NavigateNext`, `@mui/icons-material/Home`, `@mui/icons-material/Whatshot`, `@mui/icons-material/Grain`, `@mui/material/Menu`, `@mui/material/MenuItem`, `@mui/material/IconButton`, `@mui/icons-material/MoreHoriz`, `@mui/material/styles`, `@mui/material/Chip`, `@mui/icons-material/ExpandMore`

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.

### Breadcrumbs

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

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

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `component` | no | `elementType` | — |
| `expandText` | no | `string` | `'Show path'` |
| `itemsAfterCollapse` | no | `integer` | `1` |
| `itemsBeforeCollapse` | no | `integer` | `1` |
| `maxItems` | no | `integer` | `8` |
| `separator` | no | `node` | `'/'` |
| `slotProps` | no | `{ collapsedIcon?: func \| object }` | `{}` |
| `slots` | no | `{ CollapsedIcon?: elementType }` | `{}` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |



### Link

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

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

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `color` | no | `'primary' \| 'secondary' \| 'success' \| 'error' \| 'info' \| 'warning' \| 'textPrimary' \| 'textSecondary' \| 'textDisabled' \| string` | `'primary'` |
| `component` | no | `element type` | — |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |
| `TypographyClasses` | no | `object` | — |
| `underline` | no | `'always' \| 'hover' \| 'none'` | `'always'` |
| `variant` | no | `'body1' \| 'body2' \| 'button' \| 'caption' \| 'h1' \| 'h2' \| 'h3' \| 'h4' \| 'h5' \| 'h6' \| 'inherit' \| 'overline' \| 'subtitle1' \| 'subtitle2' \| string` | `'inherit'` |



### Typography

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

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `align` | no | `'center' \| 'inherit' \| 'justify' \| 'left' \| 'right'` | `'inherit'` |
| `children` | no | `node` | — |
| `classes` | no | `object` | — |
| `color` | no | `'primary' \| 'secondary' \| 'success' \| 'error' \| 'info' \| 'warning' \| 'textPrimary' \| 'textSecondary' \| 'textDisabled' \| string` | — |
| `component` | no | `elementType` | — |
| `gutterBottom` | no | `bool` | `false` |
| `noWrap` | no | `bool` | `false` |
| `sx` | no | `Array<func \| object \| bool> \| func \| object` | — |
| `variant` | no | `'body1' \| 'body2' \| 'button' \| 'caption' \| 'h1' \| 'h2' \| 'h3' \| 'h4' \| 'h5' \| 'h6' \| 'inherit' \| 'overline' \| 'subtitle1' \| 'subtitle2' \| string` | `'body1'` |
| `variantMapping` | no | `object` | `{ h1: 'h1', h2: 'h2', h3: 'h3', h4: 'h4', h5: 'h5', h6: 'h6', subtitle1: 'h6', subtitle2: 'h6', body1: 'p', body2: 'p', inherit: 'p', }` |


## 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/Breadcrumbs/Breadcrumbs.d.ts

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

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

import { SlotComponentProps } from '../utils/types';

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

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

import { BreadcrumbsClasses } from './breadcrumbsClasses';

import SvgIcon from '../SvgIcon';

export interface BreadcrumbsCollapsedIconSlotPropsOverrides {}

export interface BreadcrumbsOwnerState extends BreadcrumbsProps {
  expanded: boolean;
}

export interface BreadcrumbsOwnProps {
  /**
   * The content of the component.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<BreadcrumbsClasses> | undefined;
  /**
   * The components used for each slot inside the Breadcumb.
   * Either a string to use a HTML element or a component.
   * @default {}
   */
  slots?:
    | {
        CollapsedIcon?: React.ElementType | undefined;
      }
    | undefined;
  /**
   * The props used for each slot inside the Breadcumb.
   * @default {}
   */
  slotProps?:
    | {
        /**
         * Props applied to the CollapsedIcon slot.
         * @default {}
         */
        collapsedIcon?:
          | SlotComponentProps<
              typeof SvgIcon,
              BreadcrumbsCollapsedIconSlotPropsOverrides,
              BreadcrumbsOwnerState
            >
          | undefined;
      }
    | undefined;
  /**
   * Override the default label for the expand button.
   *
   * For localization purposes, you can use the provided [translations](https://mui.com/material-ui/guides/localization/).
   * @default 'Show path'
   */
  expandText?: string | undefined;
  /**
   * If max items is exceeded, the number of items to show after the ellipsis.
   * @default 1
   */
  itemsAfterCollapse?: number | undefined;
  /**
   * If max items is exceeded, the number of items to show before the ellipsis.
   * @default 1
   */
  itemsBeforeCollapse?: number | undefined;
  /**
   * Specifies the maximum number of breadcrumbs to display. When there are more
   * than the maximum number, only the first `itemsBeforeCollapse` and last `itemsAfterCollapse`
   * will be shown, with an ellipsis in between.
   * @default 8
   */
  maxItems?: number | undefined;
  /**
   * Custom separator node.
   * @default '/'
   */
  separator?: React.ReactNode;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
}

export interface BreadcrumbsTypeMap<
  AdditionalProps = {},
  RootComponent extends React.ElementType = 'nav',
> {
  props: AdditionalProps & BreadcrumbsOwnProps;
  defaultComponent: RootComponent;
}

declare const Breadcrumbs: OverridableComponent<BreadcrumbsTypeMap>;

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

### vendor/src/Link/Link.d.ts

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

import { DistributiveOmit } from '@mui/types';

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

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

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

import { TypographyOwnProps } from '../Typography';

import { LinkClasses } from './linkClasses';

export interface LinkOwnProps extends DistributiveOmit<LinkBaseProps, 'classes'> {
  /**
   * The content of the component.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<LinkClasses> | undefined;
  /**
   * The color of the link.
   * @default 'primary'
   */
  color?: TypographyOwnProps['color'] | 'inherit' | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
  /**
   * `classes` prop applied to the [`Typography`](https://mui.com/material-ui/api/typography/) element.
   */
  TypographyClasses?: TypographyOwnProps['classes'] | undefined;
  /**
   * Controls when the link should have an underline.
   * @default 'always'
   */
  underline?: 'none' | 'hover' | 'always' | undefined;
  /**
   * Applies the theme typography styles.
   * @default 'inherit'
   */
  variant?: TypographyOwnProps['variant'] | undefined;
}

export interface LinkTypeMap<AdditionalProps = {}, RootComponent extends React.ElementType = 'a'> {
  props: AdditionalProps & LinkOwnProps;
  defaultComponent: RootComponent;
}

declare const Link: OverridableComponent<LinkTypeMap>;

export type LinkBaseProps = DistributiveOmit<
  TypographyOwnProps,
  'children' | 'color' | 'variant' | 'classes'
>;

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

### vendor/src/Typography/Typography.d.ts

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

import { OverridableStringUnion } from '@mui/types';

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

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

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

import { TypographyVariant } from '../styles/createTypography';

import { TypographyClasses } from './typographyClasses';

export interface TypographyPropsVariantOverrides {}

export interface TypographyPropsColorOverrides {}

export interface TypographyOwnProps {
  /**
   * Set the text-align on the component.
   * @default 'inherit'
   */
  align?: 'inherit' | 'left' | 'center' | 'right' | 'justify' | undefined;
  /**
   * The content of the component.
   */
  children?: React.ReactNode;
  /**
   * Override or extend the styles applied to the component.
   */
  classes?: Partial<TypographyClasses> | undefined;
  /**
   * The color of the component.
   * It supports both default and custom theme colors, which can be added as shown in the
   * [palette customization guide](https://mui.com/material-ui/customization/palette/#custom-colors).
   */
  color?:
    | OverridableStringUnion<
        | 'primary'
        | 'secondary'
        | 'success'
        | 'error'
        | 'info'
        | 'warning'
        | `text${Capitalize<keyof TypeText>}`,
        TypographyPropsColorOverrides
      >
    | (string & {})
    | undefined;
  /**
   * If `true`, the text will have a bottom margin.
   * @default false
   */
  gutterBottom?: boolean | undefined;
  /**
   * If `true`, the text will not wrap, but instead will truncate with a text overflow ellipsis.
   *
   * Note that text overflow can only happen with block or inline-block level elements
   * (the element needs to have a width in order to overflow).
   * @default false
   */
  noWrap?: boolean | undefined;
  /**
   * The system prop that allows defining system overrides as well as additional CSS styles.
   */
  sx?: SxProps<Theme> | undefined;
  /**
   * Applies the theme typography styles.
   * @default 'body1'
   */
  variant?:
    | OverridableStringUnion<TypographyVariant | 'inherit', TypographyPropsVariantOverrides>
    | undefined;
  /**
   * The component maps the variant prop to a range of different HTML element types.
   * For instance, subtitle1 to `<h6>`.
   * If you wish to change that mapping, you can provide your own.
   * Alternatively, you can use the `component` prop.
   * @default {
   *   h1: 'h1',
   *   h2: 'h2',
   *   h3: 'h3',
   *   h4: 'h4',
   *   h5: 'h5',
   *   h6: 'h6',
   *   subtitle1: 'h6',
   *   subtitle2: 'h6',
   *   body1: 'p',
   *   body2: 'p',
   *   inherit: 'p',
   * }
   */
  variantMapping?:
    | Partial<
        Record<
          OverridableStringUnion<TypographyVariant | 'inherit', TypographyPropsVariantOverrides>,
          string
        >
      >
    | undefined;
}

export interface TypographyTypeMap<
  AdditionalProps = {},
  RootComponent extends React.ElementType = 'span',
> {
  props: AdditionalProps & TypographyOwnProps;
  defaultComponent: RootComponent;
}

declare const Typography: OverridableComponent<TypographyTypeMap>;

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

## 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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