React Holiday

Day 13: Gotta fetch 'em all

Today, we start with a new component!

🎊 🎉 🎊 🎉


Take a stab at writing this component in a new sandbox before reading the next section.

  • Name the component Pokemon
  • Make sure it’s a component that can hold state
  • Use { character: null } as the initial state
  • Take an id prop. It’ll be the index of the Pokemon we fetch.
  • Render conditionally:
    • If state has a character, render
    • Otherwise render the message ...loading

(At this point, it should always render ...loading)

Fetch a Pokemon

You got it? Great!

In the workspace below, I’ve included a fetchPokemon function. We’ll use it in the next section.

Meet componentDidMount

componentDidMount is a special power our component has. Speaking technically, it’s a method on our component class.

When defined, it’s called when a Pokemon is mounted into the DOM.

componentDidMount() {
  fetchPokemon(1, (character) => this.setState({ character: character }))

componentDidMount is the ideal place to fetch data from a server.

Tinker with it

Use the workspace below and explore fetching data in componentDidMount:

  • Fetch a pokemon with a different id
  • Log messages from componentDidMount and render observe the order in the console.