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app.js
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app.js
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/* const header = document.querySelector("header");
const headerItems = document.querySelector(".header-item");
const headerContainer = document.querySelector('.header-container');
const headerItemsOptions = {
};
const headerItemsObserver = new IntersectionObserver(function(entries,
headerItemsObserver
) {
entries.forEach(entry =>{
console.log(entry.target);
})
}, headerItemsOptions);
headerItemsObserver.observe(headerItems) */
const header = document.querySelector('header');
const issues = document.querySelectorAll('.issues-container a');
let observerOptions = {
rootMargin: '0px',
threshold: 0.5
}
var observer = new IntersectionObserver(observerCallback, observerOptions);
function observerCallback(entries, observer) {
entries.forEach(entry => {
if(entry.isIntersecting) {
//do something
issues.forEach((issue,i) =>{
issue.classList.remove('bold-issue')
})
if(entry.target.id === 'issue-5'){
header.classList.add('sky-background');
header.classList.remove('orange-background');
header.classList.remove('yellow-background');
header.classList.remove('blue-background');
header.classList.remove('red-background');
} else if(entry.target.id === 'issue-4'){
issues[1].classList.add('bold-issue');
header.classList.add('orange-background');
header.classList.remove('sky-background');
header.classList.remove('yellow-background');
header.classList.remove('blue-background');
header.classList.remove('red-background');
} else if(entry.target.id === 'issue-3'){
issues[2].classList.add('bold-issue');
header.classList.add('yellow-background');
header.classList.remove('sky-background');
header.classList.remove('orange-background');
header.classList.remove('blue-background');
header.classList.remove('red-background');
} else if(entry.target.id === 'issue-2'){
issues[3].classList.add('bold-issue');
header.classList.add('blue-background');
header.classList.remove('sky-background');
header.classList.remove('orange-background');
header.classList.remove('yellow-background');
header.classList.remove('red-background');
}
else{
issues[4].classList.add('bold-issue');
header.classList.add('red-background');
header.classList.remove('sky-background');
header.classList.remove('orange-background');
header.classList.remove('yellow-background');
header.classList.remove('blue-background');
}
} else{
}
});
};
document.querySelectorAll('.header-item').forEach((i) => {
if (i) {
observer.observe(i);
}
});