user_mda user_mda - 4 years ago 309
reST (reStructuredText) Question

Making REST calls from a react component

I am trying to make REST call from a react component and render the returned JSON data into the DOM

Here is my component

import React from 'react';

export default class ItemLister extends React.Component {
constructor() {
super();
this.state = { items: [] };
}

componentDidMount() {
fetch(`http://api/call`)
.then(result=> {
this.setState({items:result.json()});
});
}

render() {
return(
WHAT SHOULD THIS RETURN?
);
}


In order to bind the returned json in a DOM?

Answer Source

There are a couple of errors in your code. The one that's probably tripping you up is the this.setState({items:result.json()})

Fetch's .json() method returns a promise, so it will need to be dealt with as async.

fetch(`http://jsonplaceholder.typicode.com/posts`)
.then(result=>result.json())
.then(items=>this.setState({items}))

I don't know why it returns a promise (if anyone can shed light, I'm interested).

For the render function, here you go...

<ul>
   {this.state.items.map(item=><li key={item.id}>{item.body}</li>)}
</ul>

Don't forget the unique key!

For the other answer, there's no need to bind map.

Here it is working...

http://jsfiddle.net/weqm8q5w/6/

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