@jeremybarbet/react-native-markdown-display
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6.0.4 • Public • Published

React Native Markdown Display npm version Known Vulnerabilities

It a 100% compatible CommonMark renderer, a react-native markdown renderer done right. This is not a web-view markdown renderer but a renderer that uses native components for all its elements. These components can be overwritten and styled as needed.

Compatibility with react-native-markdown-renderer

This is intended to be a replacement for react-native-markdown-renderer, with a variety of bug fixes and enhancements - Due to how the new style rules work, there may be some tweaking needed, see how to style stuff section below

Install

Yarn

yarn add react-native-markdown-display

NPM

npm install -S react-native-markdown-display

Get Started

import react from 'react';
import { PureComponent } from 'react-native';
import Markdown from 'react-native-markdown-display';

const copy = `# h1 Heading 8-)

**This is some bold text!**

This is normal text
`;

export default class Page extends PureComponent {
  render() {
    return (
      <Markdown>{copy}</Markdown>
    );
  }
}

Props and Functions

The <Markdown> object takes the following common props:

Property Required Description
children true The markdown string to render
style false An object to override the styling for the various rules, see style section below for full list
mergeStyle false if true, when a style is supplied, the individual items are merged with the default styles instead of overwriting them
rules false An object of rules that specify how to render each markdown item, see rules section below for full list
onLinkPress false A handler function to change click behaviour, see handling links section below for more info
debugPrintTree false Will print the AST tree to the console to help you see what the markdown is being translated to

And some additional, less used options:

Property Required Description
renderer false Used to specify a custom renderer, you can not use the rules or styles props with a custom renderer.
markdownit false A custom markdownit instance with your configuration, default is MarkdownIt({typographer: true})
plugins false An array of plugins to be applied to the markdownit instance
maxTopLevelChildren false Defaults to null, if defined as a number will only render out first n many top level children, then will try to render out topLevelMaxExceededItem
topLevelMaxExceededItem false Defaults to <Text>...</Text> - will render when maxTopLevelChildren is hit. Make sure to give it a key!
allowedImageHandlers false Defaults to ['data:image/png;base64', 'data:image/gif;base64', 'data:image/jpeg;base64', 'https://', 'http://'] - Any image that does not start with one of these will have the defaultImageHandler value prepended to it (unless defaultImageHandler is null in which case it won't try to render anything)
defaultImageHandler false Defaults to http:// - will be prepended to an image url if it does not start with something in the allowedImageHandlers array, if this is set to null, it won't try to recover but will just not render anything instead.

Syntax Support

Headings

  # h1 Heading 8-)
  ## h2 Heading
  ### h3 Heading
  #### h4 Heading
  ##### h5 Heading
  ###### h6 Heading
iOS Android
Horizontal Rules

  Some text above
  ___

  Some text in the middle

  ---

  Some text below
iOS Android
Emphasis

  **This is bold text**

  __This is bold text__

  *This is italic text*

  _This is italic text_

  ~~Strikethrough~~
iOS Android
Blockquotes

  > Blockquotes can also be nested...
  >> ...by using additional greater-than signs right next to each other...
  > > > ...or with spaces between arrows.
iOS Android
Lists

  Unordered

  + Create a list by starting a line with `+`, `-`, or `*`
  + Sub-lists are made by indenting 2 spaces:
    - Marker character change forces new list start:
      * Ac tristique libero volutpat at
      + Facilisis in pretium nisl aliquet
      - Nulla volutpat aliquam velit
  + Very easy!

  Ordered

  1. Lorem ipsum dolor sit amet
  2. Consectetur adipiscing elit
  3. Integer molestie lorem at massa

  Start numbering with offset:

  57. foo
  58. bar
iOS Android
Code

  Inline \`code\`

  Indented code

      // Some comments
      line 1 of code
      line 2 of code
      line 3 of code


  Block code "fences"

  \`\`\`
  Sample text here...
  \`\`\`

  Syntax highlighting

  \`\`\` js
  var foo = function (bar) {
    return bar++;
  };

  console.log(foo(5));
  \`\`\`
iOS Android
Tables

  | Option | Description |
  | ------ | ----------- |
  | data   | path to data files to supply the data that will be passed into templates. |
  | engine | engine to be used for processing templates. Handlebars is the default. |
  | ext    | extension to be used for dest files. |

  Right aligned columns

  | Option | Description |
  | ------:| -----------:|
  | data   | path to data files to supply the data that will be passed into templates. |
  | engine | engine to be used for processing templates. Handlebars is the default. |
  | ext    | extension to be used for dest files. |
iOS Android
Links

  [link text](https://www.google.com)

  [link with title](https://www.google.com "title text!")

  Autoconverted link https://www.google.com (enable linkify to see)
iOS Android
Images

  ![Minion](https://octodex.github.com/images/minion.png)
  ![Stormtroopocat](https://octodex.github.com/images/stormtroopocat.jpg "The Stormtroopocat")

  Like links, Images also have a footnote style syntax

  ![Alt text][id]

  With a reference later in the document defining the URL location:

  [id]: https://octodex.github.com/images/dojocat.jpg  "The Dojocat"
iOS Android
Typographic Replacements

  Enable typographer option to see result.

  (c) (C) (r) (R) (tm) (TM) (p) (P) +-

  test.. test... test..... test?..... test!....

  !!!!!! ???? ,,  -- ---

  "Smartypants, double quotes" and 'single quotes'
iOS Android
Plugins and Extensions

Plugins for extra syntax support - see plugins for the markdown-it library that this library is built on.

All Markdown for Testing

This is all of the markdown in one place for testing that your applied styles work in all cases

Headings

  # h1 Heading 8-)
  ## h2 Heading
  ### h3 Heading
  #### h4 Heading
  ##### h5 Heading
  ###### h6 Heading


Horizontal Rules

  Some text above
  ___

  Some text in the middle

  ---

  Some text below


Emphasis

  **This is bold text**

  __This is bold text__

  *This is italic text*

  _This is italic text_

  ~~Strikethrough~~


Blockquotes

  > Blockquotes can also be nested...
  >> ...by using additional greater-than signs right next to each other...
  > > > ...or with spaces between arrows.


Lists

  Unordered

  + Create a list by starting a line with `+`, `-`, or `*`
  + Sub-lists are made by indenting 2 spaces:
    - Marker character change forces new list start:
      * Ac tristique libero volutpat at
      + Facilisis in pretium nisl aliquet
      - Nulla volutpat aliquam velit
  + Very easy!

  Ordered

  1. Lorem ipsum dolor sit amet
  2. Consectetur adipiscing elit
  3. Integer molestie lorem at massa

  Start numbering with offset:

  57. foo
  58. bar


Code

  Inline \`code\`

  Indented code

      // Some comments
      line 1 of code
      line 2 of code
      line 3 of code


  Block code "fences"

  \`\`\`
  Sample text here...
  \`\`\`

  Syntax highlighting

  \`\`\` js
  var foo = function (bar) {
    return bar++;
  };

  console.log(foo(5));
  \`\`\`


Tables

  | Option | Description |
  | ------ | ----------- |
  | data   | path to data files to supply the data that will be passed into templates. |
  | engine | engine to be used for processing templates. Handlebars is the default. |
  | ext    | extension to be used for dest files. |

  Right aligned columns

  | Option | Description |
  | ------:| -----------:|
  | data   | path to data files to supply the data that will be passed into templates. |
  | engine | engine to be used for processing templates. Handlebars is the default. |
  | ext    | extension to be used for dest files. |


Links

  [link text](https://www.google.com)

  [link with title](https://www.google.com "title text!")

  Autoconverted link https://www.google.com (enable linkify to see)


Images

  ![Minion](https://octodex.github.com/images/minion.png)
  ![Stormtroopocat](https://octodex.github.com/images/stormtroopocat.jpg "The Stormtroopocat")

  Like links, Images also have a footnote style syntax

  ![Alt text][id]

  With a reference later in the document defining the URL location:

  [id]: https://octodex.github.com/images/dojocat.jpg  "The Dojocat"


Typographic Replacements

  Enable typographer option to see result.

  (c) (C) (r) (R) (tm) (TM) (p) (P) +-

  test.. test... test..... test?..... test!....

  !!!!!! ???? ,,  -- ---

  "Smartypants, double quotes" and 'single quotes'

Rules and Styles

How to style stuff

Text styles are applied in a way that makes it much more convenient to manage changes to global styles while also allowing fine tuning of individual elements.

Think of the implementation like applying styles in CSS. changes to the body effect everything, but can be overwritten further down the style / component tree.

Be careful when styling 'text': the text rule is not applied to all rendered text, most notably list bullet points. If you want to, for instance, color all text, change the body style.

Example

const copy = `
This is some text which is red because of the body style, which is also really small!

\`\`\`
//This is a code block woooo

const cool = () => {
  console.log('????');
};
\`\`\`

and some more small text

# This is a h1
## this is a h2
### this is a h3
`;

const App: () => React$Node = () => {
  return (
    <>
      <SafeAreaView>
        <View style={{marginHorizontal: 20}}>
          <Markdown
            mergeStyle={true} 
            style={{
              body: {color: 'red', fontSize: 10},
              heading1: {color: 'purple'},
              code_block: {color: 'black', fontSize: 14}
            }}
          >
            {copy}
          </Markdown>
        </View>
      </SafeAreaView>
    </>
  );
};

Styles

Styles are used to override how certain rules are styled. The existing implementation is here

NOTE: By default styles are merged with the existing implementation, to change this, see the mergeStyle prop

Example Implementation

import react from 'react';
import {View, PureComponent, Text} from 'react-native';
import Markdown from 'react-native-markdown-display';
import { StyleSheet } from 'react-native';

const styles = StyleSheet.create({
  heading: {
    borderBottomWidth: 1,
    borderColor: '#000000',
  },
  heading1: {
    fontSize: 32,
    backgroundColor: '#000000',
    color: '#FFFFFF',
  },
  heading2: {
    fontSize: 24,
  },
  heading3: {
    fontSize: 18,
  },
  heading4: {
    fontSize: 16,
  },
  heading5: {
    fontSize: 13,
  },
  heading6: {
    fontSize: 11,
  }
});

const copy = `
# h1 Heading 8-)
## h2 Heading 8-)
### h3 Heading 8-)

| Option | Description |
| ------ | ----------- |
| data   | path to data files to supply the data that will be passed into templates. |
| engine | engine to be used for processing templates. Handlebars is the default. |
| ext    | extension to be used for dest files. |
`;

export default class Page extends PureComponent {
  render() {
    return (
      <Markdown style={styles}>{copy}</Markdown>
    );
  }
}

Rules

Rules are used to specify how you want certain elements to be displayed. The existing implementation is here

Example Implementation

import react from 'react';
import {View, PureComponent, Text} from 'react-native';
import Markdown, {getUniqueID} from 'react-native-markdown-display';

const rules = {
    heading1: (node, children, parent, styles) =>
      <Text key={getUniqueID()} style={[styles.heading, styles.heading1]}>
        [{children}]
      </Text>,
    heading2: (node, children, parent, styles) =>
      <Text key={getUniqueID()} style={[styles.heading, styles.heading2]}>
        [{children}]
      </Text>,
    heading3: (node, children, parent, styles) =>
      <Text key={getUniqueID()} style={[styles.heading, styles.heading3]}>
        [{children}]
      </Text>,
};

const copy = `
# h1 Heading 8-)
## h2 Heading 8-)
### h3 Heading 8-)

| Option | Description |
| ------ | ----------- |
| data   | path to data files to supply the data that will be passed into templates. |
| engine | engine to be used for processing templates. Handlebars is the default. |
| ext    | extension to be used for dest files. |
`;

export default class Page extends PureComponent {
  render() {
    return (
      <Markdown rules={rules}>{copy}</Markdown>
    );
  }
}

All rules and their associated styles:

Render Rule Style(s)
body body
heading1 heading1
heading2 heading2
heading3 heading3
heading4 heading4
heading5 heading5
heading6 heading6
hr hr
strong strong
em em
s s
blockquote blockquote
bullet_list bullet_list
ordered_list ordered_list
list_item list_item - This is a special case that contains a set of pseudo classes that don't align to the render rule: ordered_list_icon, ordered_list_content, bullet_list_icon, bullet_list_content
code_inline code_inline
code_block code_block
fence fence
table table
thead thead
tbody tbody
th th
tr tr
td td
link link
blocklink blocklink
image image
text text
textgroup textgroup
paragraph paragraph
hardbreak hardbreak
softbreak softbreak
pre pre
inline inline
span span

Handling Links

Links, by default, will be handled with the import { Linking } from 'react-native'; import and Linking.openURL(url); call.

It is possible to overwrite this behaviour in one of two ways:

onLinkPress Callback

import react from 'react';
import { PureComponent } from 'react-native';
import Markdown from 'react-native-markdown-display';

const copy = `[This is a link!](https://github.com/iamacup/react-native-markdown-display/)`;

export default class Page extends PureComponent {
  onLinkPress = (url) => {
    if (url) {
      // some custom logic
    }
    
    // return true to open with `Linking.openURL
    // return false to handle it yourself
    return true
  }

  render() {
    return (
      <Markdown onLinkPress={this.onLinkPress}>{copy}</Markdown>
    );
  }
}
Using a Custom Rule

You will need to overwrite one or both of link and blocklink, the original defenitions can be found here

Something like this with yourCustomHandlerFunctionOrLogicHere:

import react from 'react';
import {View, PureComponent, Text} from 'react-native';
import Markdown, {getUniqueID} from 'react-native-markdown-display';

const rules = {
  link: (node, children, parent, styles) => {
    return (
      <Text key={node.key} style={styles.link} onPress={() => yourCustomHandlerFunctionOrLogicHere(node.attributes.href) }>
        {children}
      </Text>
    );
  },
};

const copy = `[This is a link!](https://github.com/iamacup/react-native-markdown-display/)`;

export default class Page extends PureComponent {
  render() {
    return (
      <Markdown rules={rules}>{copy}</Markdown>
    );
  }
}

Disabling Specific Types of Markdown

You can dissable any type of markdown you want, which is very useful in a mobile environment, by passing the markdownit property like below. Note that for convenience we also export the MarkdownIt instance so you don't have to include it as a project dependency directly just to remove some types of markdown.

This example will stop images and links.

import Markdown from 'react-native-markdown-display';
import MarkdownIt from 'react-native-markdown-display/src/MarkdownIt';

const copy = `
# This heading will show with formatting

[but this link will just](be displayed as this text)
`;

<Markdown
  markdownit={
    MarkdownIt({typographer: true}).disable([ 'link', 'image' ])
  }
>
  {copy}
</Markdown>

A full list of things you can turn off is here

TODO

  • [ ] Code highlighting
  • [ ] Provide options for customising image display (fit image)
  • [x] Rework styles and rules - the way it is all applied works but is annoying to, for instance, change the text color of everything.

Other Notes

This is a fork of react-native-markdown-renderer, a library that unfortunately has not been updated for some time so i took all of the outstanding pull requests from that library and tested + merged as necessary.

/@jeremybarbet/react-native-markdown-display/

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