A React simple app example: fetch GitHub users information via API

To learn more about React, check out my introduction to React

Very simple example of a form that accepts a GitHub username and once it receives a submit event, it asks the GitHub API for the user information, and prints them.

This code creates a reusable Card component. When you enter a name in the input field managed by the Form component, this name is bound to its state.

When Add card is pressed, the input form is cleared by clearing the userName state of the Form component.

Output

Code

import React from "react";
import axios from "axios";

const Card = props => {
  return (
    <div style={{ margin: "1em" }}>
      <img alt="avatar" style={{ width: "70px" }} src={props.avatar_url} />
      <div>
        <div style={{ fontWeight: "bold" }}>
          {props.name}
        </div>
        <div>
          {props.blog}
        </div>
      </div>
    </div>
  );
};

const CardList = props => {
  return (
    <div>
      {props.cards.map(card => <Card {...card} />)}
    </div>
  );
};

class Form extends React.Component {
  state = {
    userName: ""
  };

  handleSubmit = event => {
    event.preventDefault();

    axios
      .get(`https://api.github.com/users/${this.state.userName}`)
      .then(resp => {
        this.props.onSubmit(resp.data);
        this.setState({ userName: "" });
      });
  };

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <input
          type="text"
          value={this.state.userName}
          onChange={event => this.setState({ userName: event.target.value })}
          placeholder="GitHub username"
          required
        />
        <button type="submit">Add card</button>
      </form>
    );
  }
}

class App extends React.Component {
  state = {
    cards: []
  };

  addNewCard = cardInfo => {
    this.setState(prevState => ({
      cards: prevState.cards.concat(cardInfo)
    }));
  };

  render() {
    return (
      <div>
        <Form onSubmit={this.addNewCard} />
        <CardList cards={this.state.cards} />
      </div>
    );
  }
}

export default App;