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

栏目: IT技术 · 发布时间: 5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

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，也希望大家多多支持码农网

查看所有标签

猜你喜欢:

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

本站部分资源来源于网络，本站转载出于传递更多信息之目的，版权归原作者或者来源机构所有，如转载稿涉及版权问题，请联系我们。

码农书籍

Linux内核完全剖析

赵炯 / 机械工业出版社 / 2006-1 / 79.00元

本书对早期Linux操作系统内核全部代友文件进行了详细的剖析，旨在让读者在尽量短的时间内对Linux的工作机理获得全面而深刻的理解，为进一步学习和研究Linux系统打下坚实的基础。虽然选择的版本较低，但该内核已能够正常编译运行，并且其中已包括了Linux工作原理的精髓。书中首先以Linux源代码版本的变迁为主线，简要介绍了Lin-ux系统的发展历史，同时着重说明了各个内核版本之间的主要区别和改进方......一起来看看《Linux内核完全剖析》这本书的介绍吧!

码农工具