building dinamically array for react-simple-image-slider

Question

React simple slider needs array of images at the star and some code inside html to initiate the slider

const images = [
  { url: "images/1.jpg" },
  { url: "images/2.jpg" },
  { url: "images/3.jpg" },
  { url: "images/4.jpg" },
  { url: "images/5.jpg" },
  { url: "images/6.jpg" },
  { url: "images/7.jpg" },
];

for images array I made

const [images, setImages] = useState([]);

maybe different way is better correct me pls. Then I have useEffect where I fetch the data

 useEffect(() => {
const getData= async () => {
      try {
        const response = await fetch(`url`, {
    fetch request....
    const ImagesArray = imagesArrayfromFetch.map((image) => ({
                url: `/img/${image}`,
              }));
              console.log(ImagesArray);
              setImages(ImagesArray);
              console.log(images);

When I console.log ImagesArray - it gives me correctly filled array object. console.log(images) gives me undefined. Here is an error probably Then inside html I build the slider object

const App = () => {
      return (
        <div>
          <SimpleImageSlider
            width={896}
            height={504}
            images={images}
            showBullets={true}
            showNavs={true}
          />
        </div>
      );
    }

So because setImages do not put array inside images slider object creates without images. Is there a way to fix this?

arcbjorn · Accepted Answer · 2022-05-05 06:58:42Z

2

It seems like you have a race condition. Setting new state must happen after resolve. Could be done in fetch().then( /* set state */ )

Cleaner way would be with await/async:

const fetchImages = async () => {
    try {
      const data = await fetch(...);
      if (data) {
        const ImagesArray = data.images.map((image) => ({
            url: `/img/${image}`,
          }));
          console.log(ImagesArray);
          setImages(ImagesArray);
      }
    } catch(error) {
      console.error(error);
    }
}
useEffect(() => fetchImages(), [])

answered May 5, 2022 at 6:58

arcbjorn

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2 Comments

David Over a year ago

doing just like that but get undefined array

David Over a year ago

I've updated my question. my fetch was the same as yours, I just did not write the detailed code. But problem is somewhere else cause console.log(images) after setImages gives empty array

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