This reusable React component will manage all of your changes to the document head with support for document title, meta, link, style, script, noscript, and base tags.
Inspired by react-document-title
Table of Contents generated with DocToc
- Examples
- Features
- Installation
- Server Usage
- Use Cases
- Contributing to this project
- License
- More Examples
import React from "react";
import Helmet from "react-helmet";
export default function Application () {
return (
<div className="application">
<Helmet title="My Title" />
...
</div>
);
};import React from "react";
import Helmet from "react-helmet";
export default function Application () {
return (
<div className="application">
<Helmet
htmlAttributes={{lang: "en", amp: undefined}} // amp takes no value
title="My Title"
titleTemplate="MySite.com - %s"
defaultTitle="My Default Title"
titleAttributes={{itemprop: "name", lang: "en"}}
base={{target: "_blank", href: "http://mysite.com/"}}
meta={[
{name: "description", content: "Helmet application"},
{property: "og:type", content: "article"}
]}
link={[
{rel: "canonical", href: "http://mysite.com/example"},
{rel: "apple-touch-icon", href: "http://mysite.com/img/apple-touch-icon-57x57.png"},
{rel: "apple-touch-icon", sizes: "72x72", href: "http://mysite.com/img/apple-touch-icon-72x72.png"}
]}
script={[
{src: "http://include.com/pathtojs.js", type: "text/javascript"},
{type: "application/ld+json", innerHTML: `{ "@context": "http://schema.org" }`}
]}
noscript={[
{innerHTML: `<link rel="stylesheet" type="text/css" href="foo.css" />`}
]}
style={[
{type: "text/css", cssText: "body {background-color: blue;} p {font-size: 12px;}"}
]}
onChangeClientState={(newState) => console.log(newState)}
/>
...
</div>
);
};- Supports
title,base,meta,link,script,noscript, andstyletags. - Attributes for
htmlandtitletags. - Supports isomorphic/universal environment.
- Nested components override duplicate head changes.
- Duplicate head changes preserved when specified in same component (support for tags like "apple-touch-icon").
- Callback for tracking DOM changes.
npm install --save react-helmet
To use on the server, call rewind() after ReactDOMServer.renderToString or ReactDOMServer.renderToStaticMarkup to get the head data for use in your prerender.
Because this component keeps track of mounted instances, you have to make sure to call rewind on server, or you'll get a memory leak.
ReactDOMServer.renderToString(<Handler />);
let head = Helmet.rewind();
head.htmlAttributes
head.title
head.base
head.meta
head.link
head.script
head.stylehead contains the following properties:
htmlAttributestitlebasemetalinkscriptnoscriptstyle
Each property contains toComponent() and toString() methods. Use whichever is appropriate for your environment. For htmlAttributes, use the JSX spread operator on the object returned by toComponent(). E.g:
const html = `
<!doctype html>
<html ${head.htmlAttributes.toString()}>
<head>
${head.title.toString()}
${head.meta.toString()}
${head.link.toString()}
</head>
<body>
<div id="content">
// React stuff here
</div>
</body>
</html>
`;function HTML () {
const attrs = head.htmlAttributes.toComponent();
return (
<html {...attrs}>
<head>
{head.title.toComponent()}
{head.meta.toComponent()}
{head.link.toComponent()}
</head>
<body>
<div id="content">
// React stuff here
</div>
</body>
</html>
);
}- Nested or latter components will override duplicate changes.
<Helmet
title="My Title"
meta={[
{"name": "description", "content": "Helmet application"}
]}
/>
<Helmet
title="Nested Title"
meta={[
{"name": "description", "content": "Nested component"}
]}
/>Yields:
<head>
<title>Nested Title</title>
<meta name="description" content="Nested component">
</head>
- Use a titleTemplate to format title text in your page title
<Helmet
title="My Title"
titleTemplate="%s | MyAwesomeWebsite.com"
/>
<Helmet
title="Nested Title"
/>Yields:
<head>
<title>Nested Title | MyAwesomeWebsite.com</title>
</head>
- Duplicate
metaand/orlinktags in the same component are preserved
<Helmet
link={[
{"rel": "apple-touch-icon", "href": "http://mysite.com/img/apple-touch-icon-57x57.png"},
{"rel": "apple-touch-icon", "sizes": "72x72", "href": "http://mysite.com/img/apple-touch-icon-72x72.png"}
]}
/>Yields:
<head>
<link rel="apple-touch-icon" href="http://mysite.com/img/apple-touch-icon-57x57.png">
<link rel="apple-touch-icon" sizes="72x72" href="http://mysite.com/img/apple-touch-icon-72x72.png">
</head>
- Duplicate tags can still be overwritten
<Helmet
link={[
{"rel": "apple-touch-icon", "href": "http://mysite.com/img/apple-touch-icon-57x57.png"},
{"rel": "apple-touch-icon", "sizes": "72x72", "href": "http://mysite.com/img/apple-touch-icon-72x72.png"}
]}
/>
<Helmet
link={[
{"rel": "apple-touch-icon", "href": "http://mysite.com/img/apple-touch-icon-180x180.png"}
]}
/>Yields:
<head>
<link rel="apple-touch-icon" href="http://mysite.com/img/apple-touch-icon-180x180.png">
</head>
- Only one base tag is allowed
<Helmet
base={{"href": "http://mysite.com/"}}
/>
<Helmet
base={{"href": "http://mysite.com/blog"}}
/>Yields:
<head>
<base href="http://mysite.com/blog">
</head>
- defaultTitle will be used as a fallback when the template does not want to be used in the current Helmet
<Helmet
defaultTitle="My Site"
titleTemplate="My Site - %s"
/>Yields:
<head>
<title>My Site</title>
</head>
But a child route with a title will use the titleTemplate, giving users a way to declare a titleTemplate for their app, but not have it apply to the root.
<Helmet
defaultTitle="My Site"
titleTemplate="My Site - %s"
/>
<Helmet
title="Nested Title"
/>Yields:
<head>
<title>My Site - Nested Title</title>
</head>
And other child route components without a Helmet will inherit the defaultTitle.
- Usage with
<script>tags:
<Helmet
script={[{
"type": "application/ld+json",
"innerHTML": `{
"@context": "http://schema.org",
"@type": "NewsArticle"
}`
}]}
/>Yields:
<head>
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "NewsArticle"
}
</script>
</head>
- Usage with
<style>tags:
<Helmet
style={[{
"cssText": `
body {
background-color: green;
}
`
}]}
/>Yields:
<head>
<style>
body {
background-color: green;
}
</style>
</head>
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