src/components/rk-select.vue

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this work for additional information regarding copyright ownership.
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<template>
  <div
    class="rk-bar-select cp flex-h"
    v-clickout="
      () => {
        visible = false;
        search = '';
      }
    "
    :class="{ active: visible }"
  >
    <div class="rk-bar-i flex-h" @click="visible = !visible">
      <div class="mr-15 rk-bar-i-text">
        <div v-if="Array.isArray(current)">
          <span class="selected" v-for="item in current" :key="item.key">
            <span>{{ item.label }}</span>
            <span class="remove-icon" v-if="current.length !== 1" @click="removeSelected(item)">×</span>
          </span>
        </div>
        <div class="ell" v-else v-tooltip:right.ellipsis="current.label || ''">
          {{ current.label }}
        </div>
      </div>
      <svg class="icon lg trans" :style="`transform: rotate(${visible ? 180 : 0}deg)`">
        <use xlink:href="#arrow-down"></use>
      </svg>
    </div>
    <div class="rk-sel" v-show="visible">
      <div>
        <input type="text" class="rk-sel-search" v-model="search" />
        <svg class="icon sm close" @click="search = ''" v-if="search">
          <use xlink:href="#clear"></use>
        </svg>
      </div>
      <div class="rk-opt-wrapper scroll_hide">
        <div
          class="rk-opt ell"
          @click="handleSelect(i)"
          :class="{ 'select-disabled': selectedOpt.includes(i.key) }"
          v-for="i in filterData"
          :key="i.key"
        >
          {{ i.label }}
        </div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
  import { Vue, Component, Prop } from 'vue-property-decorator';
  const Multiple = 'multiple';
  @Component
  export default class RkSelect extends Vue {
    @Prop() private mode: any;
    @Prop() private data!: any;
    @Prop() private current!: any;
    private search: string = '';
    private visible: boolean = false;

    get filterData() {
      return this.data.filter((i: any) => i.label.toUpperCase().indexOf(this.search.toUpperCase()) !== -1);
    }

    get selectedOpt() {
      return this.mode === Multiple ? this.current.map((item: any) => item.key) : [this.current.key];
    }

    public handleOpen() {
      this.visible = true;
    }

    public handleSelect(i: any) {
      const selected = this.mode === Multiple ? this.current.map((item: any) => item.key) : [this.current.key];
      if (selected.includes(i.key)) {
        return;
      }
      this.$emit('onChoose', i);
      this.visible = false;
    }

    private removeSelected(item: any) {
      if (this.mode === Multiple) {
        this.$emit('onChoose', item);
      }
    }
  }
</script>

<style lang="scss" scoped>
  .rk-bar-select {
    position: relative;
    height: 30px;
    justify-content: space-between;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 3px;
    color: #000;
    .sm {
      line-height: 12px;
    }
    .icon {
      flex-shrink: 0;
    }
    .selected {
      display: inline-block;
      padding: 5px;
      border-radius: 3px;
      margin: 3px;
      overflow: hidden;
      color: rgba(0, 0, 0, 0.65);
      background-color: #fafafa;
      border: 1px solid #e8e8e8;
    }
    .remove-icon {
      display: inline-block;
      margin-left: 5px;
      cursor: pointer;
    }
  }
  .rk-bar-i-text {
    width: 100%;
  }
  .rk-bar-i {
    height: 100%;
    width: 100%;
    padding: 5px 10px;
    overflow: auto;
  }
  .rk-sel {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    box-shadow: 0 1px 6px rgba(99, 99, 99, 0.2);
    border: 1px solid #ddd;
    width: 100%;
    border-radius: 0 0 3px 3px;
    border-right-width: 1px !important;
    z-index: 10;
    .close {
      position: absolute;
      right: 10px;
      top: 12px;
      opacity: 0.6;
      &:hover {
        opacity: 1;
      }
    }
  }
  .rk-opt {
    padding: 7px 15px;
    &.select-disabled {
      color: rgba(0, 0, 0, 0.25);
      cursor: not-allowed;
    }
    &:hover {
      background-color: #f5f5f5;
    }
  }
  .rk-sel-search {
    width: calc(100% - 4px);
    border: 0;
    border-bottom: 1px solid #ddd;
    outline: 0;
    padding: 7px 25px 7px 10px;
    margin: 2px;
    border-radius: 3px;
  }
  .rk-opt-wrapper {
    overflow: auto;
    max-height: 200px;
    padding-bottom: 2px;
  }
</style>