React: HTML not rendering correctly

Question

I have this React component whose main goal is to render an article stored ad MarkDown (.md file) after it is transformed into HTML by marked.

Articles.js

import React from 'react';
import marked from 'marked';
import './articles.css';

export default class Articles extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      articles: [],
      last_article: ""
    }
  }

  componentWillMount() {
    fetch('/last_article', {
      headers: {
        'Accept': 'text/markdown'
      }
    })
    .then(res => res.text())
    .then(txt => marked(txt))
    .then(html => {
      this.setState({
        last_article: html
      });
    });
  }

  render() {
    return (
      <div className="articles">
        {this.state.last_article}
      </div>
    );
  }

}

The back-end works fine and componentWillMount fetches the correct text and transforms it perfectly. But it renders like this:

I am not a React expert and never faced this problem before.

Any suggestions?

Use dangerouslySetInnerHTML to render html. facebook.github.io/react/docs/dom-elements.html — Ved
– Ved, Commented Jul 31, 2017 at 5:45

Anurag Singh Bisht · Accepted Answer · 2017-07-31 06:01:14Z

Use the dangerouslySetInnerHTML approach as I have described below.

Go through this link to see the proper documentation about dangerouslySetInnerHTML and it's side effects

class Articles extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      articles: [],
      last_article: ""
    }
  }

  componentWillMount() {
      this.setState({
        last_article: `<h1>Hello</h1>`
      });
    
  }
  
  getMarkdownText() {
    return { __html: this.state.last_article };
  }

  render() {
    return (
      <div className="articles" dangerouslySetInnerHTML={this.getMarkdownText()}/> 
      );
  }

}

ReactDOM.render(
  <Articles />,
  document.getElementById('root')
)

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id="root"></div>

Forrest Collins · Accepted Answer · 2017-07-31 06:27:16Z

1

As others have said, dangerouslySetInnerHTML will work, but if you are going to find yourself doing this a lot, check out this cool lib.

answered Jul 31, 2017 at 6:27

Forrest Collins

795 bronze badges

1 Comment

Edvaldo Silva de Almeida Jr Over a year ago

Thanks! I'll take a look at it.

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