Version: 2.0.0-alpha.48

Docusaurus Client API

Docusaurus provides some APIs on the clients that can be helpful to you when building your site.

Components

`<Head/>`

This reusable React component will manage all of your changes to the document head. It takes plain HTML tags and outputs plain HTML tags and is beginner-friendly. It is a wrapper around React Helmet.

Usage Example:

import React from 'react';
import Head from '@docusaurus/Head';

const MySEO = () => (
  <>
    <Head>
      <meta property="og:description" content="My custom description" />
      <meta charSet="utf-8" />
      <title>My Title</title>
      <link rel="canonical" href="http://mysite.com/example" />
    </Head>
  </>
);

Nested or latter components will override duplicate usages:

<Parent>
  <Head>
    <title>My Title</title>
    <meta name="description" content="Helmet application" />
  </Head>

  <Child>
    <Head>
      <title>Nested Title</title>
      <meta name="description" content="Nested component" />
    </Head>
  </Child>
</Parent>

Outputs

<head>
  <title>Nested Title</title>
  <meta name="description" content="Nested component" />
</head>

`<Link/>`

This component enables linking to internal pages as well as a powerful performance feature called preloading. Preloading is used to prefetch resources so that the resources are fetched by the time the user navigates with this component. We use an IntersectionObserver to fetch a low-priority request when the <Link> is in the viewport and then use an onMouseOver event to trigger a high-priority request when it is likely that a user will navigate to the requested resource.

The component is a wrapper around react-router’s <NavLink> component that adds useful enhancements specific to Docusaurus. All props are passed through to react-router’s <NavLink> component.

import React from 'react';
import Link from '@docusaurus/Link';

const Page = () => (
  <div>
    <p>
      Check out my <Link to="/blog">blog</Link>!
    </p>
    <p>
      {/* Note that external links still use `a` tags. */}
      Follow me on <a href="https://twitter.com/docusaurus">Twitter</a>!
    </p>
  </div>
);

`to`: string

The target location to navigate to. Example: /docs/introduction.

<Link to="/courses" />

`activeClassName`: string

The class to give the <Link> when it is active. The default given class is active. This will be joined with the className prop.

<Link to="/faq" activeClassName="selected">
  FAQs
</Link>

`<Redirect/>`

Rendering a <Redirect> will navigate to a new location. The new location will override the current location in the history stack, like server-side redirects (HTTP 3xx) do. You can refer to React Router's Redirect documentation for more info on available props.

Example usage:

import React from 'react';
import {Redirect} from '@docusaurus/router';

function Home() {
  return <Redirect to="/docs/test" />;
}

Hooks

`useDocusaurusContext`

React hook to access Docusaurus Context. Context contains siteConfig object from docusaurus.config.js.

interface DocusaurusContext {
  siteConfig?: DocusaurusConfig;
}

Usage example:

import React from 'react';
import useDocusaurusContext from '@docusaurus/useDocusaurusContext';

const Test = () => {
  const context = useDocusaurusContext();
  const {siteConfig = {}} = context;
  const {title} = siteConfig;

  return <h1>{title}</h1>;
};

`useBaseUrl`

React hook to automatically append baseUrl to a string automatically. This is particularly useful if you don't want to hardcode your config's baseUrl. We highly recommend you to use this.

Example usage:

import React, {useEffect} from 'react';
import Link from '@docusaurus/Link';
import useBaseUrl from '@docusaurus/useBaseUrl';

function Help() {
  return (
    <div className="col">
      <h2>Browse the docs</h2>
      <p>
        Learn more about Docusaurus using the{' '}
        <Link to={useBaseUrl('docs/introduction')}>official documentation</Link>
      </p>
    </div>
  );
}

Modules

`ExecutionEnvironment`

A module which exposes a few boolean variables to check the current rendering environment. Useful if you want to only run certain code on client/server or need to write server-side rendering compatible code.

import React from 'react';
import ExecutionEnvironment from '@docusaurus/ExecutionEnvironment';

function MyPage() {
  const location = ExecutionEnvironment.canUseDOM ? window.href.location : null;
  return <div>{location}</div>;
}

Field	Description
`ExecutionEnvironment.canUseDOM`	`true` if on client, `false` if SSR.
`ExecutionEnvironment.canUseEventListeners`	`true` if on client and has `window.addEventListener`.
`ExecutionEnvironment.canUseIntersectionObserver`	`true` if on client and has `IntersectionObserver`.
`ExecutionEnvironment.canUseViewport`	`true` if on client and has `window.screen`.

#Components

#<Head/>

#<Link/>

#to: string

#activeClassName: string

#<Redirect/>

#Hooks

#useDocusaurusContext

#useBaseUrl

#Modules

#ExecutionEnvironment