parsley/app/javascript/components/AppDropdown.vue

<template>
  <div ref="dropdown" class="dropdown" :class="{'is-active': open, 'is-hoverable': hover}">
    <div class="dropdown-trigger">
      <slot name="button">
        <button type="button" class="button" :class="buttonClass" @click="toggle">
          <span>{{ label }}</span>
          <app-icon icon="caret-bottom" size="xs"></app-icon>
        </button>
      </slot>
    </div>

    <div class="dropdown-menu">
      <div class="dropdown-content">
        <slot>
          Default Content
        </slot>
      </div>
    </div>
  </div>
</template>

<script setup>

import { useTemplateRef } from "vue";
import { onClickOutside } from '@vueuse/core'

const emit = defineEmits(["close", "open"]);
const props = defineProps({
  open: {
    required: false,
    type: Boolean,
    default: false
  },

  hover: {
    required: false,
    type: Boolean,
    default: false
  },

  label: {
    required: false,
    type: String,
    default: 'Select'
  },

  buttonClass: {
    required: false,
    default: ""
  }
});

const dropdownElement = useTemplateRef("dropdown");

onClickOutside(dropdownElement, event => handleOutsideClick(event))

function toggle() {
  if (props.open) {
    triggerClose();
  } else {
    triggerOpen();
  }
}

function triggerOpen() {
  emit("open");
}

function triggerClose() {
  emit("close");
}

function handleOutsideClick(evt) {
  if (props.open) {
    if (!dropdownElement.value.contains(evt.target)) {
      triggerClose();
    }
  }
}

</script>