How to change a css style each page in vue-cli - vue.js

Question

This is App.vue File
<template>
<div id="app">
<main-header/>
<router-view/>
<main-footer/>
</div>
</template>
<script>
import MainHeader from './components/layouts/MainHeader'
import MainFooter from './components/layouts/MainFooter'
export default {
name: 'App',
components: {
'main-header': MainHeader,
'main-footer': MainFooter
}
}
</script>
Header.vue file is
<ul class="nav nav-pills" id="mainNav">
<li class="dropdown">
<a class="active" href="/">
Home
</a>
</li>
<li>
<a class="dropdown-item dropdown-toggle" href="/test1">
test1
</a>
</li>
<li>
<a class="dropdown-item dropdown-toggle" href="/test2">
test2
</a>
</li>
</ul>
I want to activate "active class" differently for each page.
I don't know how to do
if I click a "test2", active class have to maintain only with the tag with "test2"
How can I resolve this issue?

Answer 1

You can consider using Vue-router with active-class prop
<ul class="nav nav-pills" id="mainNav">
<router-link to="/" tag="li" class="dropdown" active-class="active">Home</router-link>
<router-link to="/test1" tag="li" class="dropdown-item dropdown-toggle" active-class="active">Test1</router-link>
<router-link to="/test2" tag="li" class="dropdown-item dropdown-toggle" active-class="active">Test2</router-link>
</ul>
Another naive solution is checking window.location.href, but it's not simple to cover all possible cases.
<ul class="nav nav-pills" id="mainNav">
<li class="dropdown">
<a class="active" href="/">
Home
</a>
</li>
<li>
<a class="dropdown-item dropdown-toggle" href="/test1" :class="getClass('/test1')">
test1
</a>
</li>
<li>
<a class="dropdown-item dropdown-toggle" href="/test2" :class="getClass('/test2')">
test2
</a>
</li>
</ul>
<script>
export default {
methods: {
getClass(url) {
if (window.location.href.includes(url)) {
return "active"
}
return ""
}
}
}
</script>