I'm a pure student's beginner, right now I'm trying to create an adaptive menu for my project, but I need to change the color of my background because white on white is a little bit problematic.
What I tried is to create a script in order to add a class 'scroll' to my 'nav' when I'm scrolling down, and removed it when I'm going back to the top.
But as I said I'm a beginner, and it seems I did something wrong with either my script or my CSS.
Can you help me to understand how where I did something wrong?
Thanks for the help !
PS: Sorry for my english I did my best.
`https://codepen.io/Raz7/pen/zYKoJzY`
it's completly messed up, probably due to all the image I put in.
In your script tag you are using a JQuery Selector "$" but you did not add the JQuery library.
To keep things simple I will use the built-in querySelector from the document object and Vanilla Javascript.
The following code will do what you want:
let timeout;
window.addEventListener('scroll', function (e) {
// If there's a timer, cancel it
if (timeout) {
window.cancelAnimationFrame(timeout);
}
// Setup the new requestAnimationFrame()
timeout = window.requestAnimationFrame(function () {
// Run our scroll functions
let nav = document.querySelector('nav');
if (document.querySelector('header').getBoundingClientRect().top !== 0) {
nav.classList.add('scroll');
} else {
nav.classList.remove('scroll');
}
});
}, false);
To actually know what the distance to the top is you need a point of reference, in this script I used the header element as a point of reference since the header is relative to the body tag. If the header distance to top is not 0 then add the scroll class to the nav element else remove it. You can see also a timeout and requestAnimationFrame, this helps de-bouncing the scroll event.
Instead of using the JQuery Library, if you are a beginner I suggest learning about Vanilla Javascript and the DOM.
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