react function is not defined no-undef

Question

I get the following error when trying to compile my app - 'getRestaurants' is not defined no-undef

I'm having trouble tracking down why getRestaurants is not defined for zipCodeToCoords

I have an input component that takes a zip code on submit and calls zipCodeToCoords, I then want to call getRestaurants

Here is the main react component

class App extends Component {
  constructor(props){
    super(props);
    this.state = {
      restraunts:[],
      selectedRestraunt:null
    }
  }


  getRestaurants(lat,lon){
    var url = "https://developers.zomato.com/api/v2.1/geocode?lat="+lat+"&lon="+lon;
    $.ajax({
      url:url,
      headers:{
        'Accept': 'application/json',
        'user_key': 'MY KEY'
      }

    }).done(function(data){
      console.log(data);
    });
  }


  zipCodeToCoords(zip){
    var url = "https://www.zipcodeapi.com/rest/MYKEY/info.json/"+ zip +"/degrees";
    $.ajax({
      url:url,

    }).done(function(data){
      console.log(data.lat);
      getRestaurants(data.lat,data.lng);
    });
  }




  render() {
    return (
      <div className="App">
        <div className="row">
          <div className="columns large-9">
            <Input onSearchTermSubmit={this.zipCodeToCoords} />
          </div>  
        </div>
        <div className="row">
          <div className="columns large-9">
            <RestrauntInfo />
          </div>
          <div className="columns large-3">
            <RestrauntList />
          </div>
        </div>
      </div>
    );
  }
}

Here is the Input component

class Input extends Component{

    constructor(props){
        super(props);
        this.state = {zip:''};

        this.handleChange = this.handleChange.bind(this);
        this.handleSubmit = this.handleSubmit.bind(this);
    }


    handleSubmit(event){
        event.preventDefault();
        this.props.onSearchTermSubmit(this.state.zip);
    }
    handleChange(event){
        this.setState({zip:event.target.value});

    }

    render(){
        return(<div>
            <form onSubmit={this.handleSubmit}>
                <div className="input-group">
                    <span className="input-group-label">Enter Zip Code</span>
                    <input className="input-group-field" type="number" value={this.state.zip} onChange={this.handleChange} />
                    <div className="input-group-button">
                      <input type="submit" className="button" value="Submit" />
                    </div>
                </div>  
            </form> 
        </div>);
    }
}

Answer 1

Get restaurants is not some global function, it is a method on your App class so you need to call it as such. The easiest way to resolve this would probably be to:

1. Change your done callback to an arrow function
2. Call this.getRestaurants in zipCodeToCoords
3. Bind this to getRestaurants and zipCodeToCoords in your constructor i.e. this.getRestaurants = this.getRestaurants.bind(this);

The callback would become:

done((data) => {
    console.log(data.lat);
    this.getRestaurants(data.lat,data.lng);
});