How to add a class to HTML body in Vue
Adding Class in HTML body in Vue
We will be leveraging unHead from Unjs plugin, allowing us to add a class in the HTML body in Vue 3 and Typescript. Video of this tutorial available at the bottom of this page.
1. Install unHead
yarn add unhead
2. Register the plugin in the Vue app
typescript
import { createApp } from "vue";
import { createHead } from 'unhead';
const app = createApp();
const head = createHead();
app.mount("#app");
3. In the Vue app or component template tag
In the template below, we have a click function called handleClick and it was attached to the button.
html
<template>
<div>
<h1>Click the button</h1>
<button @click="handleClick">Click here</button>
</div>
</template>
4. In Vue script tag
Inside Vue script tag, we created a handleClick function that is attached to a button. When the button clicked, it will change the isActive value.
We imported useHead from unHead then we add bodyAttrs property with a key of class. The class value is a computed property that we watch.
typescript
<script lang="ts" setup>
import { useHead } from 'unhead'
import { computed, ref } from 'vue';
const isActive = ref(false);
const handleClick = () => {
isActive.value = !isActive.value;
};
useHead({
// Optional
title: 'Adding class in HTML body',
meta: [
{
name: 'description',
content: 'Vue tutorial.'
}
],
// This is where we can add a class in to the HTML body
bodyAttrs: {
class: computed(() => (isActive.value ? 'body-class' : ''))
}
});
</script>