jQuery addClass example

Change class name on click in jQuery

by Shawn Wood

HTML

<div id="container">
    <ul>
        <li>About</li>
        <li>Contact</li>
        <li>Pricing</li>
        <div class="focus first"></div>
        <div class="focus second"></div>

    </ul>
</div>

  <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/3.1.1/gsap.min.js'></script>

CSS

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #ff3636;
  overflow: hidden;
}

#container {
  width: 350px;
  height: 350px;
  display: grid;
  place-items: center;
}
#container ul {
  position: relative;
  width: 350px;
  height: 50px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-radius: 35px;
  background: rgba(255, 255, 255, 0.65);
  box-shadow: 0 12.5px 10px rgba(0, 0, 0, 0.08), 0 100px 80px rgba(0, 0, 0, 0.03);
  overflow: hidden;
}
#container ul li {
  list-style: none;
  display: grid;
  place-items: center;
  font-family: "montserrat";
  color: #ff3636;
  z-index: 10;
  cursor: pointer;
}
#container ul .focus {
  position: absolute;
  left: 0;
  top: 0;
  width: calc(100% / 3);
  height: 100%;
  border-radius: 35px;
  background: #fff;
  box-shadow: 0 12.5px 10px rgba(0, 0, 0, 0.015), 0 100px 80px rgba(0, 0, 0, 0.03);
}
#container ul .focus.second {
  left: calc(-100% / 3);
}

JavaScript

console.clear();

const liContainer = document.querySelector("ul");
const liEls = [...document.querySelectorAll("ul li")];
const slideEl_1 = document.querySelector(".focus.first");
const slideEl_2 = document.querySelector(".focus.second");

gsap.defaults({
    ease: "ease.inOut",
});
let tl = gsap.timeline();

let liRect = liContainer.getBoundingClientRect();
let slideEl_1_DefaultWidth = slideEl_1.getBoundingClientRect().width;
let slideEl_1_DefaultLeft = slideEl_1.getBoundingClientRect().left;
let slideEl_2_DefaultLeft = slideEl_2.getBoundingClientRect().left;

let startPosIndex = 1;
let reachedEnd = false;
let activeIndex = startPosIndex;

let animationDuration = 0.2;

liEls.forEach((el, index) => {
    let elRect = el.getBoundingClientRect();

    el.addEventListener("mousedown", () => {
        if (reachedEnd && index + 1 == startPosIndex) {
        tl.to(slideEl_1, animationDuration, { left: `${liRect.width}px` });
        tl.to(
        slideEl_2,
        animationDuration,
        { left: `${elRect.left - liRect.left}px` },
        `-=${animationDuration}`
        );
        tl.set(
        slideEl_1,
        { left: `${slideEl_1_DefaultLeft - liRect.left}px` },
        `+=${animationDuration}`
        );
        tl.set(
        slideEl_2,
        { left: `${slideEl_2_DefaultLeft - liRect.left}px` },
        `+=${animationDuration}`
        );
        }

        let timesWidth = index + 1 - activeIndex + 1 <= 0 ? 1 : index + 1 - activeIndex + 1;
        activeIndex = index + 1;

        tl.to(slideEl_1, animationDuration, { width: `${timesWidth * slideEl_1_DefaultWidth}px` });
        if (index + 1 != startPosIndex || reachedEnd == false) {
        tl.to(slideEl_1, animationDuration, {
        left: `${elRect.left - liRect.left}px`,
        width: `${slideEl_1_DefaultWidth}px`,
        });
        }

        if (index + 1 == liEls.length) {
        reachedEnd = true;
        } else {
        reachedEnd = false;
        }
    });
});