script.js

const imageContainer = document.getElementById('image-container')
const loader = document.getElementById('loader')

let ready = false
let imagesLoaded = 0
let totalImages = 0
let photosArray = []

// Unsplash API
let count = 5
const apiKey = 'VLr5Ctk21Xo66o7muwAIGWGrBncvGH8_Ab9mtfkVkkU'
let apiUrl = `https://api.unsplash.com/photos/random/?client_id=${apiKey}&count=${count}`

// Check if all images were loaded
function imageLoaded() {
    imagesLoaded++
    if (imagesLoaded === totalImages) {
        ready = true
        loader.hidden = true
        count = 30
        apiUrl = `https://api.unsplash.com/photos/random/?client_id=${apiKey}&count=${count}`
    }
}

// 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 the DOM
function displayPhotos(){
    imagesLoaded = 0
    totalImages = photosArray.length
    photosArray.forEach((photo) => {
        // Create <a> to link to Unslpash
        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()
    } 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()