catch function in your api should either return some data which could be handled by Api call in React class or throw new error which should be caught using a catch function in your React class code. Latter approach should be something like:
return fetch(url)
.then(function(response){
return response.json();
})
.then(function(json){
return {
city: json.name,
temperature: kelvinToF(json.main.temp),
description: _.capitalize(json.weather[0].description)
}
})
.catch(function(error) {
console.log('There has been a problem with your fetch operation: ' + error.message);
// ADD THIS THROW error
throw error;
});
Then in your React Class:
Api(region.latitude, region.longitude)
.then((data) => {
console.log(data);
this.setState(data);
}).catch((error)=>{
console.log("Api call error");
alert(error.message);
});