Learning Vue with Nuxt. Want to change navbar classes depending on the page scroll position.
Looked in several places, but haven't found a working solution.
Here's what I have to work with:
``` default.vue
<template lang="pug">
div(v-on:scroll="shrinkNav", v-on:click="shrinkNav")
b-navbar.text-center(toggleable="sm" type="light" sticky v-b-scrollspy)
#myNav.mx-auto.bg-white
b-navbar-toggle(target="nav_collapse")
b-navbar-brand.mx-auto(href="#")
| Example.org
b-collapse#nav_collapse.mx-auto(is-nav='')
b-navbar-nav(justified, style="min-width: 600px").vertical-center
b-nav-item.my-auto(href='#home') Home
b-nav-item.my-auto(href='/how') How
i.fab.fa-earlybirds.fa-2x.mt-2.mb-3
b-nav-item.my-auto(href='/values') Values
b-nav-item.my-auto(href='/join-us') Join Us
#content.container(v-on:scroll="shrinkNav", v-on:click="shrinkNav")
nuxt
nuxt
</template>
<script>
// resize navbar on scroll
export default {
methods: {
shrinkNav() {
var nav = document.getElementById('nav')
var content = document.getElementById('content')
if (nav && content) {
if(content.scrollTop >= 150) {
nav.classList.add('shrink')
} else {
nav.classList.remove('shrink')
}
}
console.log(document.documentElement.scrollTop || document.body.scrollTop)
}
}
}
</script>
```
shrinkNav runs twice on click, but nothing on scroll. What is the Vue/Nuxt way to do this?
In your .vue:
<template> section:
<nav id="nav" class="navbar is-transparent is-fixed-top">
<script> section:
export default {
mounted() {
this.$nextTick(function(){
window.addEventListener("scroll", function(){
var navbar = document.getElementById("nav");
var nav_classes = navbar.classList;
if(document.documentElement.scrollTop >= 150) {
if (nav_classes.contains("shrink") === false) {
nav_classes.toggle("shrink");
}
}
else {
if (nav_classes.contains("shrink") === true) {
nav_classes.toggle("shrink");
}
}
})
})
},
}