<div id="app">
<div
class="navbar"
:class="{ 'hidden-navbar': !showNavbar }"
></div>
<transition name="fade">
<div class="message" key="down" v-if="showNavbar">
<div class="text">
Scroll Down to Hide Navbar
</div>
<svg class="arrow" viewBox="0 0 24 24">
<path fill="#000000" d="M9,4H15V12H19.84L12,19.84L4.16,12H9V4Z" />
</svg>
</div>
<div class="message" key="up" v-else>
<div class="text">
Scroll Up to Show Navbar
</div>
<svg class="arrow" viewBox="0 0 24 24">
<path fill="#000000" d="M14,20H10V11L6.5,14.5L4.08,12.08L12,4.16L19.92,12.08L17.5,14.5L14,11V20Z" />
</svg>
</div>
</transition>
</div>* {
box-sizing: border-box;
}
body {
padding: 0;
margin: 0;
}
#app {
width: 100vw;
height: 500vh;
background: hsl(200, 50%, 90%)
}
.navbar {
height: 60px;
width: 100vw;
background: hsl(200, 50%, 50%);
position: fixed;
box-shadow: 0 2px 15px rgba(71, 120, 120, 0.5);
transform: translate3d(0, 0, 0);
transition: 0.1s all ease-out;
}
.navbar.hidden-navbar {
box-shadow: none;
transform: translate3d(0, -100%, 0);
}
.message {
position: fixed;
left: 50vw;
top: calc(50vh + 60px);
transform: translate(-50%, -50%);
font-family: 'Avenir', Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
font-size: 5vw;
text-align: center;
color: hsl(200, 50%, 60%);
font-weight: bold;
}
.arrow {
width: 7.5vw;
height: 7.5vw;
}
.arrow path {
fill: hsl(200, 50%, 50%);
}
.fade-enter-active, .fade-leave-active {
transition: 0.1s all ease-out;
}
.fade-enter, .fade-leave-to {
opacity: 0;
}
@media (max-width: 900px) {
.message {
font-size: 7vw;
}
.arrow {
width: 10vw;
height: 10vw;
}
}
@media (max-width: 600px) {
.message {
width: 90vw;
font-size: 10vw;
}
.arrow {
width: 15vw;
height: 15vw;
}
}const OFFSET = 60
new Vue({
el: '#app',
data () {
return {
showNavbar: true,
lastScrollPosition: 0,
scrollValue: 0
}
},
mounted () {
this.lastScrollPosition = window.pageYOffset
window.addEventListener('scroll', this.onScroll)
const viewportMeta = document.createElement('meta')
viewportMeta.name = 'viewport'
viewportMeta.content = 'width=device-width, initial-scale=1'
document.head.appendChild(viewportMeta)
},
beforeDestroy () {
window.removeEventListener('scroll', this.onScroll)
},
methods: {
onScroll () {
if (window.pageYOffset < 0) {
return
}
if (Math.abs(window.pageYOffset - this.lastScrollPosition) < OFFSET) {
return
}
this.showNavbar = window.pageYOffset < this.lastScrollPosition
this.lastScrollPosition = window.pageYOffset
}
}
})This Pen doesn't use any external CSS resources.