useMediaQuery

Это хук медиа-запроса CSS для React. Он ожидает(слушает) совпадения с медиа-запросом CSS. Он позволяет отображать компоненты в зависимости от того, соответствует запрос или нет.

Some of the key features:

• ⚛️ Имеет идиоматический React API.
• 🚀 Он производителен. Он наблюдает за документом, чтобы определить, когда его медиа-запросы изменяются, вместо периодического опроса значения.
• 1 1 кБ в сжатом виде.
• 🤖 It supports server-side rendering.

Простой медиа-запрос

Вы должны предоставить медиа-запросу первый аргумент хука. The media query string can be any valid CSS media query, e.g. '(prefers-color-scheme: dark)'.

import React from 'react';
import useMediaQuery from '@material-ui/core/useMediaQuery';

export default function SimpleMediaQuery() {
  const matches = useMediaQuery('(min-width:600px)');

  return <span>{`(min-width:600px) matches: ${matches}`}</span>;
}

⚠️ You can't use 'print' per browsers limitation, e.g. Firefox.

Использование помощников точек перелома Material-UI

Вы можете использовать помощников точек перелома Material-UI следующим образом:

import { useTheme } from '@material-ui/core/styles';
import useMediaQuery from '@material-ui/core/useMediaQuery';

function MyComponent() {
  const theme = useTheme();
  const matches = useMediaQuery(theme.breakpoints.up('sm'));

  return <span>{`theme.breakpoints.up('sm') matches: ${matches}`}</span>;
}

Alternatively, you can use a callback function, accepting the theme as a first argument:

import useMediaQuery from '@material-ui/core/useMediaQuery';

function MyComponent() {
  const matches = useMediaQuery(theme => theme.breakpoints.up('sm'));

  return <span>{`theme.breakpoints.up('sm') matches: ${matches}`}</span>;
}

⚠️ There is no default theme support, you have to inject it in a parent theme provider.

Using JavaScript syntax

You can use json2mq to generate media query string from a JavaScript object.

import React from 'react';
import json2mq from 'json2mq';
import useMediaQuery from '@material-ui/core/useMediaQuery';

export default function JavaScriptMedia() {
  const matches = useMediaQuery(
    json2mq({
      minWidth: 600,
    }),
  );

  return <span>{`{ minWidth: 600 } matches: ${matches}`}</span>;
}

Тестирование

You need an implementation of matchMedia in your test environment.

For instance, jsdom doesn't support it yet. You should polyfill it. Using css-mediaquery to emulate it is recommended.

import mediaQuery from 'css-mediaquery';

function createMatchMedia(width) {
  return query => ({
    matches: mediaQuery.match(query, { width }),
    addListener: () => {},
    removeListener: () => {},
  });
}

describe('MyTests', () => {
  beforeAll(() => {
    window.matchMedia = createMatchMedia(window.innerWidth);
  });
});

Server-side rendering

⚠️ Server-side rendering and client-side media queries are fundamentally at odds. Be aware of the tradeoff. The support can only be partial.

Try relying on client-side CSS media queries first. For instance, you could use:

• <Box display>
• themes.breakpoints.up(x)
• or <Hidden implementation="css">

If none of the above alternatives are an option, you can proceed reading this section of the documentation.

First, you need to guess the characteristics of the client request, from the server. You have the choice between using:

• User agent. Parse the user agent string of the client to extract information. Using ua-parser-js to parse the user agent is recommended.
• Client hints. Read the hints the client is sending to the server. Be aware that this feature is not supported everywhere.

Finally, you need to provide an implementation of matchMedia to the useMediaQuery with the previously guessed characteristics. Using css-mediaquery to emulate matchMedia is recommended.

For instance on the server-side:

width: deviceType === 'mobile' ?
      import ReactDOMServer from 'react-dom/server';
import parser from 'ua-parser-js';
import mediaQuery from 'css-mediaquery';
import { ThemeProvider } from '@material-ui/core/styles';

function handleRender(req, res) {
  const deviceType = parser(req.headers['user-agent']).device.type || 'desktop';
  const ssrMatchMedia = query => ({
    matches: mediaQuery.match(query, {
      // The estimated CSS width of the browser. '0px' : '1024px',
    }),
  });

  const html = ReactDOMServer.renderToString(
    <ThemeProvider
      theme={{
        props: {
          // Change the default options of useMediaQuery
          MuiUseMediaQuery: { ssrMatchMedia },
        },
      }}
    >
      <App />
    </ThemeProvider>,
  );

  // …
}

Make sure you provide the same custom match media implementation to the client-side to guarantee a hydration match.

Migrating from withWidth()

The withWidth() higher-order component injects the screen width of the page. You can reproduce the same behavior with a useWidth hook:

<ThemeProvider theme={theme}>
  <MyComponent />
</ThemeProvider>

API

useMediaQuery(query, [options]) => matches

Аргументы

1. query (String | Function): A string representing the media query to handle or a callback function accepting the theme (in the context) that returns a string.
2. варианты (объекта [optional]):
   • options.defaultMatches (Boolean [optional]): As window.matchMedia() is unavailable on the server, we return a default matches during the first mount. The default value is false.
   • options.matchMedia (Function [optional]) You can provide your own implementation of matchMedia. This can be used for handling an iframe content window.
   • options.noSsr (Boolean [optional]): По умолчанию - false. In order to perform the server-side rendering reconciliation, it needs to render twice. A first time with nothing and a second time with the children. This double pass rendering cycle comes with a drawback. It's slower. You can set this flag to true if you are not doing server-side rendering.
   • options.ssrMatchMedia (Function [optional]) You can provide your own implementation of matchMedia in a server-side rendering context.

Note: You can change the default options using the default props feature of the theme with the MuiUseMediaQuery key.

Возвращает

matches: Matches is true if the document currently matches the media query and false when it does not.

Примеры

import React from 'react';
import useMediaQuery from '@material-ui/core/useMediaQuery';

export default function SimpleMediaQuery() {
  const matches = useMediaQuery('(min-width:600px)');

  return <span>{`(min-width:600px) matches: ${matches}`}</span>;
}