Jsxfromhtml NPM

JSXFromHTML

With jsxfromhtml you can easily convert html strings into React / React Native / Preact / Inferno (you know, JSX in general) components.

Demo

Like always on now :) - jsxfromhtml.now.sh

Installation

yarn add jsxfromhtml

// or

npm install -S jsxfromhtml

Also for React-Native you have to install some Node specific modules

yarn add stream buffer events

// or

npm install -S stream buffer events

Usage

Web

Web is quite simple. All you have to do is:

const html = `<p>
  <span>text</span>
</p>`

() => <JSXFromHTML html={html} />

Mapping

But you can do more! jsxfromhtml allows you to map HTML tags into custom components.

const html = `<p>
  <a href="https://twitter.com/rafalfilipek">rafalfilipek</a>
</p>`

const SuperLink = (props) => {
  const { href, children } = props;
  const parts = href.match(/twitter\.com\/(.*)\/?/);
  if (parts) {
    const name = parts[1];
    return (
      <span>
        <img src={`https://twitter.com/${name}/profile_image?size=mini`} />
        <a href={href}>{name}</a>
      </span>
    );
  } else {
    return <a {...props} />;
  }
};

() => <JSXFromHTML html={html} mapElements={{ a: SuperLink }} />

With mapElements you can map any HTML tag into a custom componetn. In this example we want to use our SuperLink component to show profile picture next to the twitter username.

Omitting

Sometimes you will get tags you don't want. Like style or script. To get rid of them just map them to false.

const html = `<p>
  <span>hello</span>
  <script>alert(1)</script>
</p>`

General mapping / React Native

While mapElements is quite cool for web we have to handle all tags in native with just Text and View components. That's why there are two more props mapInline and mapBlock.

const html = `<p>
  hello <span>world</span> !
</p>`

  () => <JSXFromHTML mapInline={Text} mapBlock={View} html={html} />

You will get:

  <View>
    <Text>hello </Text><Text>World</Text><Text> !</Text>
  </View>

As you can see jsxfromhtml will wrap every text with is not inside inline tag.

Styling

Every HTML tag has some default styles. You will probaly want to mimic that in your app. Each component will get data-tag prop.

const html = '<strong>text</strong>'

const InlineElement = (props) => {
  const stylesMap = {
    strong: { fontWeight: '600' },
  };
  return <Text style={stylesMap[props.tag]}>{props.children}</Text>
}

() => <JSXFromHTML mapInline={InlineElement} html={html} />

Info: you can still use mapElements for other tags.

Attributes

All html attributes will be converted into proper jsx form. So for -> htmlFor, class -> className etc. You will receive them like regular props.

const html = `<a class="link" href="https://twitter.com/rafalfilipek" title="Rafał Filipek">rafalfilipek</a>`

const InlineElement = (props) => (
  /* props:
      - children: rafalfilipek
      - className: link
      - tag: a
      - href: https://twitter.com/rafalfilipek
      - title: Rafał Filipek
  */
  <a {...props} />
)

() => <JSXFromHTML mapInline={InlineElement} html={html} />

Map order

We have mapElement, mapInline, mapBlock props.

if mapElements value for tag is false then the tag is omitted.
use value from mapElements if defined
for inline elements use value from mapInline if defined
for block elements use value from mapBlock if defined
use tag name

React Native inline

There is no display: inline in React Native. You can't have two inline tags (like Text) in one line. The only solution I know is to wrap them with another Text component. This sucks:

<span>
  <span>one</span>
  <span>line</span>
</span>

Thats why jsxfromhtml handles that for you 💥! We will group inline tags inside block tags and wrap them with span (Text) tag 🤙.

//input
<div>
  <span>one</span>
  <span>two</span>
  <p>
    <span>three</span>
    <span>four</span>
  </p>
  <span>five</span>
</div>

//output
<div>
  <span> // group
    <span>one</span>
    <span>two</span>
  </span>
  <p>
    <span>  // group
      <span>three</span>
      <span>four</span>
    </span>
  </p>
  <span>five</span>
</div>