React AJAX example

This project was bootstrapped with Create React App.

Steps

Create a new react project:

$ create-react-app react-ajax
$ cd react-ajax
$ npm start

Install axios:

$ npm install axios --save

Remove all files in the "src" folder except index.js. Then add the following code to index.js:

import React from 'react';
import ReactDOM from 'react-dom';
import axios from 'axios';

class FetchDemo extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      posts: []
    };
  }

  componentDidMount() {
    axios.get(`http://www.reddit.com/r/${this.props.subreddit}.json`)
      .then(res => {
        const posts = res.data.data.children.map(obj => obj.data);
        this.setState({ posts });
      });
  }

  render() {
    return (
      <div>
        <h1>{`/r/${this.props.subreddit}`}</h1>
        <ul>
          {this.state.posts.map(post =>
            <li key={post.id}>{post.title}</li>
          )}
        </ul>
      </div>
    );
  }
}

ReactDOM.render(
  <FetchDemo subreddit="reactjs"/>,
  document.getElementById('root')
);

Turn to your neighbor and work together to comment the code to fully understand what's happening.

Done? Add an input box to take a subreddit. Re-fire the AJAX request.

Next, separate the class to a new file called src/fetch.js, export the class, and update index.js to require the class and update the DOM.

Finally, create a new component called GithubProfile in a new file. After your component mounts, make an ajax call to http://api.github.com/users/ + your github username. Your component should render the username and an image of the user. You should use componentDidMount to make your AJAX call. Add the component to the DOM.