Pedro Romão

Posted on Nov 11, 2021

Tap bar with liquid animation using CSS and JavaScript

#css #webdev #beginners #tutorial

In this article, we will create a tap bar that you can use in your mobile projects. Let's first look at what are we building:

Let's code...

HTML

<div class="container">
  <div class="bar">
    <div class="bar-item pre-active" onclick="changeActive(this)">
      <div class="bar-fluid"></div>
      <div class="drop"></div>
      <i class="far fa-calendar-alt"></i>
    </div>
    <div class="bar-item" onclick="changeActive(this)">
      <div class="bar-fluid"></div>
      <div class="drop"></div>
      <i class="far fa-sticky-note"></i>
    </div>
    <div class="bar-item" onclick="changeActive(this)">
      <div class="bar-fluid"></div>
      <div class="drop"></div>
      <i class="far fa-bell"></i>
    </div>
    <div class="bar-item" onclick="changeActive(this)">
      <div class="bar-fluid"></div>
      <div class="drop"></div>
      <i class="far fa-address-book"></i>
    </div>
  </div>
</div>

In the HTML code, the "bar" class is the container of our tap bar and "bar-item" class are the buttons that trigger the animations.

Now let's look at the CSS:

CSS

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

.container {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #fc5c65;
}

.bar {
  padding: 0px 10px;
  display: flex;
  align-items: center;
  background-color: #ffffff;
  border-radius: 10px 10px 20px 20px;
  box-shadow: 3px 3px 0px 0px rgb(235 59 90);
}

.bar .bar-item {
  position: relative;
  overflow: hidden;
  padding: 20px 25px;
  cursor: pointer;
}

.bar .bar-item i {
  z-index: 1;
  position: relative;
  color: #a4b0be;
  transition: all .3s ease-in-out;
}

.bar .bar-item.pre-active i {
  color: #fc5c65;
}

.bar .bar-item.active i {
  color: #fc5c65;
  animation: colour 1s ease-in-out;
}

.bar .bar-item.active .bar-fluid {
  position: absolute;
  top: 0px;
  left: 0px;
  background-color: #fc5c65;
  width: 100%;
  height: 0px;
  animation: fluid 1s ease-in-out;
}

.bar .bar-item.active .bar-fluid:before {
  content: '';
  position: absolute;
  top: 0px;
  left: -50%;
  background-color: #ffffff;
  width: 110%;
  height: 400%;
  border-radius: 50%;
}

.bar .bar-item.active .bar-fluid:after {
  content: '';
  position: absolute;
  top: 0px;
  right: -50%;
  background-color: #ffffff;
  width: 110%;
  height: 400%;
  border-radius: 50%;
}

.bar .bar-item.active .drop {
  position: absolute;
  top: -2.5px;
  left: 30.5px;
  background-color: #fc5c65;
  width: 2.5px;
  height: 2.5px;
  border-radius: 50%;
  animation: drop 1s ease-in-out;
}

@keyframes colour {
  0% { color: #a4b0be; }
  55% {
    color: #a4b0be;
    transform: scale(1);
  }
  60% {
    color: #fc5c65;
    transform: scale(1);
  }
  70% { transform: scale(1.1); }
  80% { transform: scale(1); }
}

@keyframes fluid {
  0% { height: 0px; }
  30% { height: 10px; }
  100% { height: 0px; }
}

@keyframes drop {
  20% { top: -2.5px; }
  50% { top: 21px; }
  51% { top: -2.5px; }
}

JavaScript

const preactiveItem = document.querySelector('.pre-active')
const barItems = document.querySelectorAll('.bar-item')

function changeActive (newActive) {
  preactiveItem.classList.remove('pre-active')
  barItems.forEach(element => {
    element.classList.remove('active')
  })
  newActive.classList.add('active')
}

Codepen is here:

Top comments (47)

Dolen Ch. Deori • Nov 11 '21

So satisfying.. Nice work..

Pedro Romão • Nov 11 '21

Thank you!!

Md Irshad • Nov 11 '21

Mind blowing work

Pedro Romão • Nov 11 '21

Thank you!!

UmbrellaC0rp • Nov 11 '21

Wow. Really nice. Very smooth and that droplet.. Amazing.

Pedro Romão • Nov 11 '21

Thank you!! I'm working to bring more stuff

ARYAMAN.CODES • Nov 11 '21

It's soo amazing 🔥🔥thanks for sharing code this will help me for my learning 🙂🙂

Pedro Romão • Nov 12 '21

Thank you!!

Obaino82 • Nov 11 '21

♥️👌

Olaleye Olalekan Oladipo • Nov 12 '21

Incredible. #stuffsthatilove

PC Soft Kit • Dec 25 '21

I like your post very much it is very informative and interesting. Your posts always inspire me. Keep sharing such wonderful posts, it motivates a lot. flstudio

qq449245884 • Nov 13 '21

Dear Romaopedro，may I translate your all dev articles into Chinese?I would like to share it with more developers in China. I will give the original author and original source.