Exploring the process of defining directives with Vue 3's composition API

How can directives be defined and used in Vue3's composition API using the new syntactic sugar in SFC <script setup> format? In the past, with the options API, it looked something like this:

import click_outside from "@/directives/click-outside.js";
export default {
  directives: {
    "click-outside": click_outside,
  }, 
  ...
}

click-outside.js

<script setup>
import {defineProps, onBeforeMount, onUnmounted, directive } from "vue";

const onBeforeMount = (el, binding) => {
  ...
};
const onUnmounted = (el) => {
 ...
};
</script>

I'm struggling to find the equivalent code in the composition API

Answer №1

@Estus Flask's explanation covers the basics. To further elaborate, when incorporating directives into your Vue.js projects, you simply import them in the same way you would components, using either PascalCase or camelCase, and then utilize them directly in your templates.

<script setup>
import vScrollLock from "@/directives/scroll-lock.js";
const lockScroll = () =>{ ... }
...
</script>
<template>
...
<div v-scroll-lock="lockScroll">
...
...
</template>

Answer №2

Three different methods are utilized to achieve feature parity with regular script Single File Components (SFC).

The props argument from setup, as well as props, emits, and expose fields from component options, are accessed using the define... helpers.

The context argument from setup (with only slots and attrs properties) is obtained through the use of use... helpers.

Components and directives are indirectly accessed by importing them with the same name, as outlined in RFC document.

Other features, such as the name property, are still accessible through the traditional script element, which can coexist with script setup.

Answer №3

Include directives:

include hover_effect from "@/directives/hover-effect.js";
const vHoverEffect = hover_effect;

How to Implement:

<div c-hover-effect>...</div>

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