Quill Delta to HTML Converter

Converts Quill's Delta format to HTML (insert ops only) with properly nested lists.

You can try a live demo of the conversion by opening the demo-browser.html file after cloning the repo.

Breaking change: import/require has changed as of v0.10.0. See Usage below

Quickstart

Installation

npm install quill-delta-to-html

Usage

var QuillDeltaToHtmlConverter = require('quill-delta-to-html').QuillDeltaToHtmlConverter;

// TypeScript / ES6:
// import { QuillDeltaToHtmlConverter } from 'quill-delta-to-html'; 

var deltaOps =  [
    {insert: "Hello\n"},
    {insert: "This is colorful", attributes: {color: '#f00'}}
];

var cfg = {};

var converter = new QuillDeltaToHtmlConverter(deltaOps, cfg);

var html = converter.convert(); 

Configuration

QuillDeltaToHtmlConverter accepts a few configuration options as shown below:

Rendering Quill Formats

You can customize the rendering of Quill formats by registering to the render events before calling the convert() method.

There are beforeRender and afterRender events and they are called multiple times before and after rendering each group. A group is one of:

• continuous sets of inline elements
• a video element
• list elements
• block elements (header, code-block, blockquote, align, indent, and direction)

beforeRender event is called with raw operation objects for you to generate and return your own html. If you return a falsy value, system will return its own generated html.

afterRender event is called with generated html for you to inspect, maybe make some changes and return your modified or original html.

converter.beforeRender(function(groupType, data){
    // ... generate your own html 
    // return your html
});
converter.afterRender(function(groupType, htmlString){
    // modify if you wish
    // return the html
});

html = converter.convert();

Following shows the parameter formats for beforeRender event:

op object will have the following format:

{
    insert: {
        type: '' // one of 'text' | 'image' | 'video' | 'formula',
        value: '' // some string value  
    }, 
    attributes: {
        // ... quill delta attributes 
    }
}

Rendering Inline Styles

If you are rendering to HTML that you intend to include in an email, using classes and a style sheet are not recommended, as not all browsers support style sheets. quill-delta-to-html supports rendering inline styles instead. The easiest way to enable this is to pass the option inlineStyles: true.

You can customize styles by passing an object to inlineStyles instead:

inlineStyles: {
   font: {
      'serif': 'font-family: Georgia, Times New Roman, serif',
      'monospace': 'font-family: Monaco, Courier New, monospace'
   },
   size: {
      'small': 'font-size: 0.75em',
      'large': 'font-size: 1.5em',
      'huge': 'font-size: 2.5em'
   },
   indent: (value, op) => {
      var indentSize = parseInt(value, 10) * 3;
      var side = op.attributes['direction'] === 'rtl' ? 'right' : 'left';
      return 'padding-' + side + ':' + indentSize + 'em';
   },
   direction: (value, op) => {
      if (value === 'rtl') {
         return 'direction:rtl' + ( op.attributes['align'] ? '' : '; text-align: inherit' );
      } else {
         return '';
      }
   }
};

Keys to this object are the names of attributes from Quill. The values are either a simple lookup table (like in the 'font' example above) used to map values to styles, or a fn(value, op) which returns a style string.

Rendering Custom Blot Formats

You need to tell system how to render your custom blot by registering a renderer callback function to renderCustomWith method before calling the convert() method.

If you would like your custom blot to be rendered as a block (not inside another block or grouped as part of inlines), then add renderAsBlock: true to its attributes.

Example:

let ops = [
    {insert: {'my-blot': {id: 2, text: 'xyz'}}, attributes: {renderAsBlock: true|false}}
];

let converter = new QuillDeltaToHtmlConverter(ops);

// customOp is your custom blot op
// contextOp is the block op that wraps this op, if any. 
// If, for example, your custom blot is located inside a list item,
// then contextOp would provide that op. 
converter.renderCustomWith(function(customOp, contextOp){
    if (customOp.insert.type === 'my-blot') {
        let val = customOp.insert.value;
        return `<span id="${val.id}">${val.text}</span>`;
    } else {
        return 'Unmanaged custom blot!';
    }
});

html = converter.convert();

customOp object will have the following format:

{
    insert: {
        type: string //whatever you specified as key for insert, in above example: 'my-blot'
        value: any // value for the custom blot  
    }, 
    attributes: {
        // ... any attributes custom blot may have
    }
}

Advanced Custom Rendering Using Grouped Ops

If you want to do the full rendering yourself, you can do so by getting the processed & grouped ops.

let groupedOps = converter.getGroupedOps();

Each element in groupedOps array will be an instance of the following types:

BlotBlock represents custom blots with renderAsBlock:true property pair in its attributes

See above for op object format.