multiselect.vue

<template>
    <div>
        <label id="listbox-label" class="block text-sm font-medium text-gray-700">
            Assigned to
        </label>
        <input type="hidden" :value="selectedValues" name="name">
        <div class="mt-1 relative">
            <button @click="selected = !selected" type="button" aria-haspopup="listbox" aria-expanded="true"
                    aria-labelledby="listbox-label"
                    class="bg-white relative w-full border border-gray-300 rounded-md shadow-sm pl-3 pr-10 py-2 text-left cursor-default focus:outline-none focus:ring-1 focus:ring-indigo-500 focus:border-indigo-500 sm:text-sm">
                <span class="block truncate" v-text="selectedText"/>
                <span class="absolute inset-y-0 right-0 flex items-center pr-2 pointer-events-none">
        <!-- Heroicon name: selector -->
        <svg class="h-5 w-5 text-gray-400" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor"
             aria-hidden="true">
          <path fill-rule="evenodd"
                d="M10 3a1 1 0 01.707.293l3 3a1 1 0 01-1.414 1.414L10 5.414 7.707 7.707a1 1 0 01-1.414-1.414l3-3A1 1 0 0110 3zm-3.707 9.293a1 1 0 011.414 0L10 14.586l2.293-2.293a1 1 0 011.414 1.414l-3 3a1 1 0 01-1.414 0l-3-3a1 1 0 010-1.414z"
                clip-rule="evenodd"/>
        </svg>
      </span>
            </button>

            <transition
                leave-active-class="transition ease-in duration-100"
                leave-class="opacity-100"
                leave-to-class="opacity-0">
                <div v-show="selected" class="absolute mt-1 w-full rounded-md bg-white shadow-lg">
                    <ul tabindex="-1" role="listbox" aria-labelledby="listbox-label"
                        aria-activedescendant="listbox-item-3"
                        class="max-h-60 rounded-md py-1 text-base ring-1 ring-black ring-opacity-5 overflow-auto focus:outline-none sm:text-sm">

                        <li @mouseenter="highlightedValue=option.value" @mouseleave="highlightedValue=-1"
                            @click="toggleOption(option)"
                            v-for="option in options" id="listbox-option-0" role="option"
                            class="cursor-default select-none relative py-2 pl-3 pr-9"
                            :class="option.value === highlightedValue? 'text-white bg-indigo-600' : 'text-gray-900'">
                            <span class="block truncate"
                                  :class="optionIsSelected(option)? 'font-semibold':'font-normal'"
                                  v-text="option.label"/>


                            <span v-show="optionIsSelected(option)"
                                  class="absolute inset-y-0 right-0 flex items-center pr-4"
                                  :class="option.value===highlightedValue?'text-white':'text-indigo-600'">
            <svg class="h-5 w-5" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor"
                 aria-hidden="true">
              <path fill-rule="evenodd"
                    d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z"
                    clip-rule="evenodd"/>
            </svg>
          </span>
                        </li>

                        <!-- More items... -->
                    </ul>
                </div>
            </transition>
        </div>
    </div>
</template>

<script>
export default {
    name: "MultiSelect",
    data() {
        return {
            selected: false,
            selectedOptions: [],
            selectedValue: 2,
            highlightedValue: -1,
            options: [
                {value: 1, label: 'Shane Poppleton'},
                {value: 2, label: 'Len Groves'},
                {value: 3, label: 'Theresa Groves'}
            ]
        }
    },
    computed: {
        selectedText() {
            if (this.selectedOptions.length === 0) return "No selection";
            return this.selectedOptions.map((option) => option.label).join(',')
        },
        selectedValues() {
            return this.selectedOptions.map((option) => option.value);
        }
    },
    methods: {
        toggleOption(option) {
            console.log('Toggling option: ' + option);
            let index = this.selectedOptions.indexOf(option);

            if (index !== -1) {
                this.selectedOptions.splice(index, 1);
            } else {
                this.selectedOptions.push(option);
            }
        },
        optionIsSelected(option) {
            return this.selectedOptions.indexOf(option) !== -1;
        }
    }
}
</script>

<style scoped>

</style>