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script.js
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script.js
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const imageContainer = document.getElementById('image-container');
const loader = document.getElementById('loader');
let ready = false;
let imagesLoaded = 0;
let totalImages = 0;
let photosArray = [];
let isInitialLoad = true;
// Unsplash API
const initialCount = 5;
const subsequentCount = 30;
const apiKey = '0Bxekwa5J-r4LqKOP7hQR8wL1ppKK8KYh7vNSVH5R8M';
setUrlToFetchCount(initialCount);
function setUrlToFetchCount(imgCount) {
apiUrl = `https://api.unsplash.com/photos/random/?client_id=${apiKey}&count=${imgCount}`;
}
// Check if all images were loaded
function imageLoaded() {
imagesLoaded++;
if(imagesLoaded === totalImages){
ready = true;
loader.hidden = true;
}
}
// Helper function to set attributes on DOM elements
function setAttributes(element, attributes){
for (const key in attributes) {
element.setAttribute(key, attributes[key]);
}
}
// Create elements for links and photos, Add them to DOM
function displayPhotos() {
imagesLoaded = 0;
totalImages = photosArray.length;
// Run for each object in photosArray
photosArray.forEach((photo) => {
// Create <a> to link to Unsplash
const item = document.createElement('a');
setAttributes(item, {
href: photo.links.html,
target: '_blank',
});
// Create <img> for photo
const img = document.createElement('img');
setAttributes(img, {
src: photo.urls.regular,
alt: photo.alt_description,
title: photo.alt_description,
});
// Event listener, check when each is finished loading
img.addEventListener('load', imageLoaded);
// Put <img> inside <a>, then put both inside imageContainer Element
item.appendChild(img);
imageContainer.appendChild(item);
});
}
// Get Photos from Unsplash API
async function getPhotos() {
try{
const response = await fetch(apiUrl);
photosArray = await response.json();
displayPhotos();
if(isInitialLoad){
setUrlToFetchCount(subsequentCount);
isInitialLoad = false;
}
} catch (error) {
// Catch error here
}
}
// Check to see if scrolling near bottom of page, Load more photos
window.addEventListener('scroll', () => {
if(window.innerHeight + window.scrollY >= document.body.offsetHeight - 1000 && ready) {
ready = false;
getPhotos();
}
});
// On Load
getPhotos();