inline-html

Inline local assets referenced in an HTML document.

This library parses HTML, embeds the contents of local assets that are referenced within that HTML, and returns a new inlined HTML string.

The following HTML elements and CSS data types are inlined:

• Images - The source path is replaced with a datauri.

• Linked LESS stylesheets - The LESS is compiled and the result is inlined within a <style> element. Note that @imports are processed as well.

• CSS url data types - The reference path is replaced with a datauri. These can be used in linked stylesheets, style elements, and element style attributes.

Also, inline-html calls can be statically evaluated and included in Browserify bundles using the html-inlinify transform.

Usage

Assuming ...

• main.less

  @import (less) 'main.css';
  div { background-image: url('path/to/file'); }
  

• main.css

  @font-face { src: url('path/to/file'); }
  

Then ...

var co = require('co');
var inline = require('inline-html');

co(function * () {
	var html = `
		<link rel="stylesheet/less" href="main.less"/>
		<style> div { background-image: url('path/to/file'); } </style>
		<div style="background-image: url('path/to/file');"></div>
		<img src="path/to/file"/>
	`;
	html = yield inline.html(html);
	console.log(html);
	/**
		<style>
			@font-face { src: url('data:...'); }
			div { background-image: url('data:...'); }
		</style>
		<style> div { background-image: url('data:...'); } </style>
		<div style="background-image: url('data:...');"></div>
		<img src="data:..."/>
	 */
});

Installation

npm install inline-html

API

• inline.html
• inline.file
• Results

---

### inline.html ( html [, options] )

Parses an HTML string and embeds referenced local assets into the HTML.

Returns a Promise that is fulfilled with an html string or an instance of Results depending on the value of options.verbose.

Arguments

• html - An HTML string to inline.

• options

  • filename - The filename used to resolve relative paths. If this option is not provided, relative paths will be resolved relative to the process's current working directory.
  • less - An object containing LESS options to pass to the less compiler. Defaults to {}.
  • verbose - A boolean that determines the promises fulfillment value. Supported values are:
    • true: An instance of Results.
    • false: An html string. (Default)

Example

co(function * () {
	var html = yield inline.html(`<img src="test.png">`);
	console.log(html); // <img src="data:...">
});

---

### inline.file ( filename [, options] )

Reads an HTML file and embeds referenced local assets into the HTML.

Returns a Promise that is fulfilled with an html string or an instance of Results depending on the value of options.verbose.

Arguments

• html - A filename of an HTML file to inline. Relative file paths are resolved relative to the filename's directory.

• options

  • less - An object containing LESS options to pass to the less compiler. Defaults to {}.
  • verbose - A boolean that determines the promises fulfillment value. Supported values are:
    • true: An instance of Results.
    • false: An html string. (Default)

Example

co(function * () {
	html = yield inline.file(`index.html`);
	console.log(html); // <img src="data:...">
});

---

### Results

The Promise returned by these functions is optionally fulfilled with a results object that has the following properties:

• html - The inlined html
• files - An array of filenames for the local assets that were inlined.