@lyra/block-content-to-hyperscript NPM

block-content-to-hyperscript

Render an array of block text from Lyra with HyperScript.

Installing

npm install --save @lyra/block-content-to-hyperscript

Usage

const h = require('hyperscript')
const blocksToHyperScript = require('@lyra/block-content-to-hyperscript')
const client = require('@lyra/client')({
  dataset: '<some dataset>'
})

const serializers = {
  types: {
    code: props => h('pre', {className: props.node.language}, h('code', props.node.code))
  }
}

client.fetch('*[_type == "article"][0]').then(article => {
  const el = blocksToHyperScript({
    blocks: article.body,
    serializers: serializers
  })

  document.getElementById('root').appendChild(el)
})

Options

className - When more than one block is given, a container node has to be created. Passing a className will pass it on to the container. Note: see renderContainerOnSingleChild.
renderContainerOnSingleChild - When a single block is given as input, the default behavior is to not render any container. If you always want to render the container, pass true.
serializers - Specifies the functions to use for rendering content. Merged with default serializers.
serializers.types - Serializers for block types, see example above
serializers.marks - Serializers for marks - data that annotates a text child of a block. See example usage below.
serializers.list - Function to use when rendering a list node
serializers.listItem - Function to use when rendering a list item node
serializers.hardBreak - Function to use when transforming newline characters to a hard break (default: <br/>, pass false to render newline character)
serializers.container - Serializer for the container wrapping the blocks
imageOptions - When encountering image blocks, this defines which query parameters to apply in order to control size/crop mode etc.

In addition, in order to render images without materializing the asset documents, you should also specify:

dataset - Name of the Lyra dataset containing the document that is being rendered.

Examples

Rendering custom marks

const input = [
  {
    _type: 'block',
    children: [
      {
        _key: 'a1ph4',
        _type: 'span',
        marks: ['s0m3k3y'],
        text: 'Lyra'
      }
    ],
    markDefs: [
      {
        _key: 's0m3k3y',
        _type: 'highlight',
        color: '#E4FC5B'
      }
    ]
  }
]

const highlight = props => h('span', {style: {backgroundColor: props.mark.color}}, props.children)

const content = blocksToHyperScript({
  blocks: input,
  serializers: {marks: {highlight}}
})

Specifying image options

blocksToHyperScript({
  blocks: input,
  imageOptions: {w: 320, h: 240, fit: 'max'},
  dataset: 'mydataset'
})

Customizing default serializer for `block`-type

const BlockRenderer = props => {
  const style = props.node.style || 'normal'

  if (/^h\d/.test(style)) {
    const level = style.replace(/[^\d]/g, '')
    return h('h2', {className: `my-heading level-${level}`}, props.children)
  }

  return style === 'blockquote'
    ? h('blockquote', {className: 'my-block-quote'}, props.children)
    : h('p', {className: 'my-paragraph'}, props.children)
}

blocksToHyperScript({
  blocks: input,
  serializers: {types: {block: BlockRenderer}}
})