parsley/app/javascript/components/AppDropdown.vue

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

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

<script>

  export default {
    props: {
      open: {
        required: true,
        type: Boolean
      },

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

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

    methods: {
      toggle() {
        if (this.open) {
          this.triggerClose();
        } else {
          this.triggerOpen();
        }
      },

      triggerOpen() {
        this.$emit("open");
      },

      triggerClose() {
        this.$emit("close");
      },

      handleOutsideClick(evt) {
        if (this.open) {
          if (!this.$el.contains(evt.target)) {
            this.triggerClose();
          }
        }
      }
    },

    mounted() {
      document.addEventListener("click", this.handleOutsideClick);
    },

    beforeDestroy() {
      document.removeEventListener("click", this.handleOutsideClick);
    }
  }

</script>