Javascript using Fetch and pagination, recursive?

Question

Hello I\'m new to Javascript and APIs.

But I have an excersise where I should get Data from.

https://swapi.co/api/planets/

The problem is that it doe

Answer 1

You could recursively create a promise resolve chain. A bit less repetition and you'll know when all planets are loaded when the parent promise resolves.

function getStarWarsPlanets(progress, url = 'https://swapi.co/api/planets', planets = []) {
  return new Promise((resolve, reject) => fetch(url)
    .then(response => {
        if (response.status !== 200)  {
          throw `${response.status}: ${response.statusText}`;
        }
        response.json().then(data => { 
          planets = planets.concat(data.results);

          if(data.next) {
            progress && progress(planets);
            getStarWarsPlanets(progress, data.next, planets).then(resolve).catch(reject)
          } else {
            resolve(planets);
          }
        }).catch(reject);
    }).catch(reject));
}

function progressCallback(planets) {
  // render progress
  console.log(`${planets.length} loaded`);
}

getStarWarsPlanets(progressCallback)
  .then(planets => {
    // all planets have been loaded
    console.log(planets.map(p => p.name))
  })
  .catch(console.error);