[SOLVED] Migrating "detect click outside" custom directive from Vue 2 to Vue 3

Migrating "detect click outside" custom directive from Vue 2 to Vue 3

Based on this question Detect click outside element and this answer https://stackoverflow.com/a/42389266, I'm trying to migrate the directive from Vue 2 to Vue 3. It seems that binding.expression and vnode.context not exists more. How can I make it work?

app.directive('click-outside', {
    beforeMount (el, binding, vnode) {
        el.clickOutsideEvent = function (event) {
            if (!(el === event.target || el.contains(event.target))) {
                vnode.context[binding.expression](event);
            }
        };
        document.body.addEventListener('click', el.clickOutsideEvent);
    },
    unmounted (el) {
        document.body.removeEventListener('click', el.clickOutsideEvent);
    }
});

Solution

You can use binding.value instead like this:

const { createApp } = Vue;

const highlightEl = (color ) => (event, el) => {
  if (el) {
    el.style.background = color;
  } else {
    event.target.style.background = color;
  }
}
const clearHighlightEl = (event, el) => {
  if (el) {
    el.style.background = '';
  } else {
    event.target.style.background = '';
  }
}

const app = Vue.createApp({
  setup() {
    return {
      highlightEl,
      clearHighlightEl
    }
  }
})

app.directive('click-outside', {
  mounted(el, binding, vnode) {
    el.clickOutsideEvent = function(event) {
      if (!(el === event.target || el.contains(event.target))) {
        binding.value(event, el);
      }
    };
    document.body.addEventListener('click', el.clickOutsideEvent);
  },
  unmounted(el) {
    document.body.removeEventListener('click', el.clickOutsideEvent);
  }
});

app.mount('#app')

<script src="https://unpkg.com/vue@3.0.0-rc.11/dist/vue.global.prod.js"></script>

<div id="app">
  <h1 v-click-outside="highlightEl('yellow')" @click="clearHighlightEl">Element 1</h1>
  <p v-click-outside="highlightEl('#FFCC77')" @click="clearHighlightEl">Element 2</p>
</div>