获取React.js无法正常工作

Question

I am trying to do a fetch request in react.js and I don't seem to be fetching anything. I feel as though it is a stupid mistake and I am not noticing it. Any help would be appreciated.

 import React, {Component} from 'react'; import './App.css'; import TimeSearch from './TimeSearch.jsx'; import CurrentTime from './CurrentTime.jsx'; class App extends Component { constructor(props) { super(props); this.state = { list: [] }; } handleFormSubmit(item) { var url = 'https://api.aladhan.com/timingsByCity?city=' + item + '&country=US&method=2'; fetch(url) .then(response => { return response.json(); }) .then(json => { this.setState({ Fajir: json.Fajir, Sunrise: json.Sunrise, Dhuhr: json.Dhuhr }); }); } render() { return ( <div className="App"> <h1>Welcome to Prayer Times!</h1> <h6>Search for times in any city in the United States</h6> <TimeSearch handleFormSubmit={item => { this.handleFormSubmit(item); }} /> <CurrentTime Fajir={this.state.Fajir} /> </div> ); } } export default App; // Time Search Component import React, {Component} from 'react'; class TimeSearch extends Component { render() { return ( <ul> <form onSubmit={e => this.handleFormSubmit(e)}> <input type="text" id="lookUp" placeholder="Search by City" ref="seachBox" /> <button type="submit" id="searchButtons"> {' '} Search{' '} </button> </form>{' '} </ul> ); } handleFormSubmit(e) { e.preventDefault(); var item = this.refs.searchBox.value; this.props.handleFormSubmit(item); } } export default TimeSearch; // Current Time Component import React, {Component} from 'react'; class CurrentTime extends Component { render() { return ( <div id="time"> <h1 id="fajir"> {this.props.Fajir} </h1> </div> ); } } export default CurrentTime; 

Update https://i.stack.imgur.com/YJx9T.png

Nothing shows up when I log the which is confusing me and I tried making an API request using Postman windows application and it works 100% fine so I have no clue what is going on now

Answer 1

I think your fetch code looks ok, are any errors being thrown in the console? It might be your handler not being bound to the correct context. If you don't bind the function correctly, the this.setState will cause an error because this is not the correct context. You might want to bind it in the constructor, or even better, use an initializer like this:

handleFormSubmit = (item) => {
  const url = `https://api.aladhan.com/timingsByCity?city=${item}&country=US&method=2`;

  fetch(url)
    .then((response) => {
     return response.json();
    })
    .then((json) => {
      this.setState({
        Fajir: json.Fajir,
        Sunrise: json.Sunrise,
        Dhuhr: json.Dhuhr
      });
    });
}

One thing to do is check your browser's network developer tab and make sure the request is going through correctly.

Update

Looks like it's working now, see the fetch code below:

 const item = 'Chicago'; var url = 'https://api.aladhan.com/timingsByCity?city=' + item + '&country=US&method=2'; fetch(url) .then((response) => { return response.json(); }) .then((json) => { console.log(json); }); 

Answer 2

hey try this fiddle it is working just open the console it is logging out the response. Fiddle Link

HTML

<div id="container"></div>

JS

class Hello extends React.Component {
handleFormSubmit = (item) => {
  const url = 'https://api.aladhan.com/timingsByCity?city='+item+'&country=US&method=2';
  fetch(url)
    .then((response) => {
        console.log(response);
     return response.json();
    })
    .then((json) => {
      this.setState({
        Fajir: json.Fajir,
        Sunrise: json.Sunrise,
        Dhuhr: json.Dhuhr
      });
    });
}
  render() {
    return <button onClick={() => this.handleFormSubmit(2)}>Click Me</button>;
  }
}

ReactDOM.render(
  <Hello name="World" />,
  document.getElementById('container')
);

Answer 3

Your fetch statement looks okay.

A shot in the dark:

When attaching the event handler on the form, make sure to bind the context:

<form onSubmit={this.handleFormSubmit.bind(this)}>

Or in the constructor

this.handleFormSubmit.bind(this)

Show us more of the Component please...