React Native HTMLView

A component which takes HTML content and renders it as native views, with customisable style and handling of links, etc.

In action (from ReactNativeHackerNews):

Table of contents

• Install
• Usage
• Example
• Changelog

Install

npm install react-native-htmlview --save

Usage

props:

• value: a string of HTML content to render
• onLinkPress: a function which will be called with a url when a link is pressed. Passing this prop will override how links are handled (defaults to calling Linking.openURL(url))
• stylesheet: a stylesheet object keyed by tag name, which will override the styles applied to those respective tags.
• renderNode: a custom function to render HTML nodes however you see fit. If the function returns undefined (not null), the default renderer will be used for that node. The function takes the following arguments:
  • node the html node as parsed by htmlparser2
  • index position of the node in parent node's children
  • siblings parent node's children (including current node)
  • parent parent node
  • defaultRenderer the default rendering implementation, so you can use the normal rendering logic for some subtree. defaultRenderer takes the following arguments:
    • node the node to render with the default rendering logic
    • parent the parent of node of node

Example

import React from 'react';
import HTMLView from 'react-native-htmlview';

class App extends React.Component {
  render() {
    const htmlContent = `<p><a href="http://jsdf.co">&hearts; nice job!</a></p>`;

    return (
      <HTMLView
        value={htmlContent}
        stylesheet={styles}
      />
    );
  }
}

const styles = StyleSheet.create({
  a: {
    fontWeight: '300',
    color: '#FF3366', // make links coloured pink
  },
});

Custom Link Handling

When a link is clicked, by default ReactNative.Linking.openURL is called with the link url. You can customise what happens when a link is clicked with onLinkPress:

class App extends React.Component {
  render() {
    return (
      <HTMLView
        value={this.props.html}
        onLinkPress={(url) => console.log('clicked link: ', url)}
      />
    );
  }
}

If you're getting the error "undefined is not an object (evaluating 'RCTLinkingManager.openURL’)” from the LinkingIOS API, try adding ‘RCTLinking' to the project's 'Linked Frameworks and Libraries’. You might have to find RCTLinking.xcodeproj in the react-native package dir and drag that into your main Xcode project first.

Custom Element Rendering

You can implement the renderNode prop to add support for unsupported element types, or override the rendering for supported types.

For example, here is how you might implement the <iframe> element:

function renderNode(node, index, siblings, parent, defaultRenderer) {
  if (node.name == 'iframe') {
    const a = node.attribs;
    const iframeHtml = `<iframe src="${a.src}"></iframe>`;
    return (
      <View key={index} style={{width: Number(a.width), height: Number(a.height)}}>
        <WebView source={{html: iframeHtml}} />
      </View>
    );
  }
}

const htmlContent = `
  <div>
    <iframe src="http://info.cern.ch/" width="360" height="300" />
  </div>
`;

class App extends React.Component {
  render() {
    return (
      <HTMLView value={htmlContent} renderNode={renderNode} />
    );
  }
}

Alternatively, this example shows how you could disallow the <iframe> element:

function renderNode(node, index, siblings, parent, defaultRenderer) {
  if (node.name == 'iframe') {
    return null;
  }
}

const htmlContent = `
  <div>
    <iframe src="http://info.cern.ch/" width="360" height="300" />
  </div>
`;

class App extends React.Component {
  render() {
    return (
      <HTMLView value={htmlContent} renderNode={renderNode} />
    );
  }
}

Changelog

• 0.9.0
  • exposed styles prop
  • exposed defaultRenderer in renderNode (@brandonreavis, @koenpunt)
  • added addLineBreaks (@jmacedoit)
• 0.7.0 - fixed for recent versions of react-native
• 0.6.0 - onLinkPress fix (@damusnet), headers now only have one single line break (@crysfel)
• 0.5.0 - react-native 0.25 compat (@damusnet)
• 0.4.0 - re-renders properly when html content changes