node-html-to-image: Generate Images from HTML

栏目: IT技术 · 发布时间: 4年前

内容简介：This module exposes a function that generates images (png, jpeg) from HTML. It uses puppeteer in headless mode to achieve it. Additionally, it embarksList of all available options:

Welcome to node-html-to-image :sunrise_over_mountains:

A Node.js library that generates images from HTML

:house: Homepage

Description

This module exposes a function that generates images (png, jpeg) from HTML. It uses puppeteer in headless mode to achieve it. Additionally, it embarks Handlebars to provide a way to add logic in your HTML.

Install

npm install node-html-to-image
# or
yarn add node-html-to-image

Usage

const nodeHtmlToImage = require('node-html-to-image')

nodeHtmlToImage({
  output: './image.png',
  html: '<html><body>Hello world!</body></html>'
})
  .then(() => console.log('The image was created successfully!'))

Options

List of all available options:

option	description	type	required
ouput	The ouput path for generated image	string	required
html	The html used to generate image content	string	required
type	The type of the generated image	jpeg or png (default: png)	optional
content	If provided html property is considered an handlebars template and use content value to fill it	object	optional
waitUntil	Define when to consider markup succeded. Learn more .	string or Array	optional
puppeteerArgs	The puppeteerArgs property let you pass down custom configuration to puppeteer. Learn more .	object	optional
transparent	The transparent property let you generate images with transparent background (for png type).	boolean	optional

Setting output image resolution

node-html-to-image takes a screenshot of the body tag's content. If you want to set output image's resolution you need to set its dimension using CSS like in the following example.

const nodeHtmlToImage = require('node-html-to-image')

nodeHtmlToImage({
  output: './image.png',
  html: `<html>
    <head>
      <style>
        body {
          width: 2480px;
          height: 3508px;
        }
      <style>
      </style>
    </head>
    <body>Hello world!</body>
  </html>
  `
})
  .then(() => console.log('The image was created successfully!'))

Example with Handlebars

Handlerbars is a templating language. It generates HTML from a template and an input object. In the following example we provide a template to node-html-to-image and a content object to fill the template.

const nodeHtmlToImage = require('node-html-to-image')

nodeHtmlToImage({
  output: './image.png',
  html: '<html><body>Hello {{name}}!</body></html>',
  content: { name: 'you' }
})
  .then(() => console.log('The image was created successfully!'))

Handlebars provides a lot of expressions to handle common use cases like conditions or loops.

Dealing with images

If you want to display an image which is stored remotely do it as usual. In case your image is stored locally I recommend having your image in base64 . Then you need to pass it to the template with the content property. Here is an example:

const nodeHtmlToImage = require('node-html-to-image')
const fs = require('fs');

const image = fs.readFileSync('./image.jpg');
const base64Image = new Buffer(bitmap).toString('base64');

nodeHtmlToImage({
  output: './image.png',
  html: '<html><body><img src="{{imageSource}}" /></body></html>',
  content: { imageSource: base64Image }
})

node-html-to-image-cli - CLI for this module

Run tests

You need to install tesseract on your computer before launching tests. Here is the procedure for Mac users:

brew install tesseract
brew install tesseract-lang

Launch test:

yarn test

Author

:bust_in_silhouette: FRIN Yvonnick frin.yvonnick@gmail.com

Contributing

Contributions, issues and feature requests are welcome!

Feel free to check issues page .

Show your support

Give a :star:️ if this project helped you!

:memo: License

This project is Apache--2.0 licensed.

This README was generated with :heart: by readme-md-generator

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