Fetching from API endpoint with React returns value undefined

user_13886927 0
Viewed 522

I am attempting to fetch data from this NHL API: https://statsapi.web.nhl.com/api/v1/people/8477474/

When i output the call to my page it returns undefined and i can't get it to display the value. Oddly enough, the first element in the object displays correctly but not any of the nested elements.

Here is my code

import React, {Component} from "react"

class App extends Component {
constructor() {
    super()
    this.state = {
      loading: false,
      player: {}
    }
} 

componentDidMount() {
  this.setState({loading: true})
  fetch("https://statsapi.web.nhl.com/api/v1/people/8477474/")
    .then(response => response.json())
    .then(data => {
         this.setState({
           loading: false,
            player: data
         })
}) 

}

render() { 
  const fullname = this.state.loading ? "Loading..." : this.state.player.people[0].fullName; 
  return ( 
        <div>
            {fullname }
        </div> 
    )
}
}

export default App

This is not supposed to return undefined, because the key value is clearly there and i believe i am targeting it right.

I tried console logging but i also get undefined. I tried as well removing the [0] and doing this.state.player.people.fullName and all kinds of alternatives but no luck.

reactjs fetch api javascript
3 Answers

Set the initial state of loading to true, and remove the line this.setState({loading: true}).

user_31580990

There is a small amount of time where loading is false and the data isn't in player yet. Try the below

const fullname = Object.keys(this.state.player).length ? this.state.player.people[0].fullName:""

return ( 
    <div>
        {this.state.loading ? "Loading....": fullname }
    </div> 
)
user_7371140

You could initiate player state to null. Then use this line.

const fullname = this.state.player ? this.state.player.people[0].fullName:""

Or you could also do this with React Hooks if you wanted to as well.

https://codesandbox.io/s/baseball-fetch-api-30ehh?file=/src/App.js

import React, { useState, useEffect } from "react";
import "./styles.css";

export default function App() {
  const [loading, setLoading] = useState(true);
  const [player, setPlayer] = useState();
  useEffect(() => {
    const fetchPeople = async () => {
      await fetch("https://statsapi.web.nhl.com/api/v1/people/8477474/")
        .then((res) => res.json())
        .then((res) => setPlayer(res))
        .then(() => setLoading(false))
        .catch((err) => setLoading(err));
    };
    fetchPeople();
  }, []);

  console.log(player);
  const fullname = player ? player.people[0].fullName : "";
  return <div className="App">{loading ? "Loading...." : fullname}</div>;
}
user_100562980
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