Created
November 22, 2016 16:09
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Render a react component to an html document that shares all the links and styles for printing, and convert it to a data URI for window.open
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| import React, { PureComponent, PropTypes } from 'react'; | |
| import { render, unmountComponentAtNode } from 'react-dom'; | |
| import { Base64 } from 'js-base64'; | |
| import Promise from 'bluebird'; | |
| const htmlDocTemplate = ({ links, pageStyles, body, title = 'Print' }) => (` | |
| <html> | |
| <head> | |
| <title>${title}</title> | |
| ${links} | |
| <style>${pageStyles}</style> | |
| </head> | |
| <body>${body}</body> | |
| <script>window.print();</script> | |
| </html> | |
| `); | |
| const templateToUri = html => ( | |
| `data:text/html;base64,${encodeURIComponent(Base64.encode(html))}` | |
| ); | |
| export default function renderComponentToPrintHtml(component) { | |
| return new Promise((resolve, reject) => { | |
| const _el = document.createElement('div'); | |
| _el.style.display = 'none'; | |
| document.body.appendChild(_el); | |
| try { | |
| render(component, _el); | |
| // collect all the link tags that link to stylesheets | |
| const links = _.chain(document.getElementsByTagName('link')) | |
| .filter(l => l.rel && l.rel.toLowerCase() == 'stylesheet') | |
| .map(l => l.outerHTML) | |
| .value().join('\n'); | |
| // collect all the style tags in the document | |
| const pageStyles = _.map(document.getElementsByTagName('style'), el => el.innerHTML).join('\n'); | |
| resolve( | |
| templateToUri( | |
| htmlDocTemplate({ links, pageStyles, body: _el.innerHTML }) | |
| ) | |
| ); | |
| unmountComponentAtNode(_el); | |
| } catch (err) { | |
| reject(err); | |
| } | |
| document.body.removeChild(_el); | |
| }); | |
| }; |
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This isn't an asynchronous function as written, but it could be re-written to use a web worker (web workers don't have access to the DOM so this is a lot more work)