# Portal

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

Render children into a separate DOM container while preserving the React tree.

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

## Use case and business boundary

Portal does not confer overlay semantics or focus behavior; container resolution must work in the target lifecycle.

## Native composition and scope

`Portal`

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 |
| --- | --- | --- |
| `Portal.container` | Grid layout flag or Portal DOM container; their types must not be mixed. | `Portal` |
| `Portal.disablePortal` | Keep native content in its current DOM tree instead of a Portal. | `Portal` |

## 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.

- Introduction · `SimplePortal` · upstream native demo

## Actual usage example

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

```tsx
import * as React from 'react';
import Portal from '@mui/material/Portal';
import { Box } from '@mui/system';

export default function SimplePortal() {
  const [show, setShow] = React.useState(false);
  const container = React.useRef(null);

  const handleClick = () => {
    setShow(!show);
  };

  return (
    <div>
      <button type="button" onClick={handleClick}>
        {show ? 'Unmount children' : 'Mount children'}
      </button>
      <Box sx={{ p: 1, my: 1, border: '1px solid' }}>
        It looks like I will render here.
        {show ? (
          <Portal container={() => container.current!}>
            <span>But I actually render here!</span>
          </Portal>
        ) : null}
      </Box>
      <Box sx={{ p: 1, my: 1, border: '1px solid' }} ref={container} />
    </div>
  );
}

```

## Example dependency boundaries

`react`, `@mui/material/Portal`, `@mui/system`

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.

### Portal

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

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `children` | no | `node` | — |
| `container` | no | `HTML element \| func` | — |
| `disablePortal` | no | `bool` | `false` |


## 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/Portal/Portal.tsx

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

import * as ReactDOM from 'react-dom';

import PropTypes from 'prop-types';

import useEnhancedEffect from '@mui/utils/useEnhancedEffect';

import useForkRef from '@mui/utils/useForkRef';

import setRef from '@mui/utils/setRef';

import getReactElementRef from '@mui/utils/getReactElementRef';

import exactProp from '@mui/utils/exactProp';

import HTMLElementType from '@mui/utils/HTMLElementType';

import { PortalProps } from './Portal.types';
```

## 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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