React-helmet-hack NPM

This reusable React component will manage all of your changes to the document head with support for document title, meta, link, script, and base tags.

Inspired by react-document-title

Table of Contents generated with DocToc

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"
                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" }`}
                ]}
                onChangeClientState={(newState) => console.log(newState)}
            />
            ...
        </div>
    );
};

Features

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").
Supports base, meta, link, script, style tags and html attributes.
Callback for tracking DOM changes.

Installation

npm install --save react-helmet

Server Usage

To use on the server, call rewind() after ReactDOM.renderToString or ReactDOM.renderToStaticMarkup to get the head data for use in your prerender.

ReactDOM.renderToString(<Handler />);
let head = Helmet.rewind();

head.htmlAttributes
head.title
head.base
head.meta
head.link
head.script

head contains seven possible properties:

htmlAttributes
title
base
meta
link
script
style

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:

As string output

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>
`;

As React components

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>
    );
}

Use Cases

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 meta and/or link tags 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>

Contributing to this project

Please take a moment to review the guidelines for contributing.

License

MIT

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