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.

Quickstart

Installation

npm install quill-delta-to-html

Usage

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

// or, in TypeScript:
// import QuillDeltaToHtmlConverter = require('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:

Option	Default	Description
paragraphTag	'p'	Custom tag to wrap inline html elements
encodeHtml	true	If true, <, >, /, ', ", & characters in content will be encoded.
classPrefix	'ql'	A css class name to prefix class generating styles such as size, font, etc.
multiLineBlockquote	true	Instead of rendering multiple blockquote elements for quotes that are consecutive and have same styles(align, indent, and direction), it renders them into only one
multiLineHeader	true	Same deal as multiLineBlockquote for headers
multiLineCodeblock	true	Same deal as multiLineBlockquote for code-blocks
linkRel	''	Specifies a value to put on the rel attr on links
linkTarget	'_blank'	Specifies target for all links; use '' (empty string) to not generate target attribute. This can be overridden by an individual link op by specifiying the target with a value in the respective op's attributes
allowBackgroundClasses	false	If true, css classes will be added for background attr

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:

groupType	data
video	{op: op object}
block	{op: op object: ops: Array<op object>}
list	{items: Array<{item: block, innerList: list or null }> }
inline-group	{ops: Array<op object>}

op object will have the following format:

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

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.

Example:

let ops = [
    {insert: {'my-blot': {id: 2, text: 'xyz'}}}
];

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:

type	properties
InlineGroup	ops: Array<op object>
VideoItem	op: op object
BlockGroup	op: op object, ops: Array<op object>
ListGroup	items: Array<ListItem>
	ListItem: {item:BlockGroup, innerList:ListGroup}

See above for op object format.