skywalking-booster-ui/src/components/SelectSingle.vue

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this work for additional information regarding copyright ownership.
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  http://www.apache.org/licenses/LICENSE-2.0

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<template>
  <div class="bar-select cp flex-h" :class="{ active: visible }">
    <div class="bar-i" @click="setPopper">
      <span v-if="selected.value">
        {{ selected.label }}
      </span>
      <span class="no-data" v-else>Please select a option</span>
      <span class="remove-icon" @click="removeSelected" v-if="clearable">
        ×
      </span>
    </div>
    <div class="opt-wrapper" v-show="visible">
      <div
        class="opt ell"
        @click="handleSelect(i)"
        :class="{ 'select-disabled': selected.value === i.value }"
        v-for="i in options"
        :key="i.value"
      >
        {{ i.label }}
      </div>
    </div>
  </div>
</template>
<script lang="ts" setup>
import { ref, watch } from "vue";
import type { PropType } from "vue";
import { Option } from "@/types/app";

/*global  defineProps, defineEmits*/
const emit = defineEmits(["change"]);
const props = defineProps({
  options: {
    type: Array as PropType<(Option & { disabled: boolean })[]>,
    default: () => [],
  },
  value: {
    type: String as PropType<string>,
    default: () => "",
  },
  clearable: { type: Boolean, default: false },
});
const visible = ref<boolean>(false);
const opt = props.options.find((d: Option) => props.value === d.value);
const selected = ref<Option>(opt || { label: "", value: "" });

function handleSelect(i: Option) {
  selected.value = i;
  emit("change", i.value);
}
function removeSelected() {
  selected.value = { label: "", value: "" };
  emit("change", "");
}
watch(
  () => props.value,
  (data) => {
    const opt = props.options.find((d: Option) => data === d.value);
    selected.value = opt || { label: "", value: "" };
  }
);
document.body.addEventListener("click", handleClick, false);

function handleClick() {
  visible.value = false;
}
function setPopper(event: any) {
  event.stopPropagation();
  visible.value = !visible.value;
}
</script>
<style lang="scss" scoped>
.bar-select {
  position: relative;
  justify-content: space-between;
  border: 1px solid #ddd;
  background: #fff;
  border-radius: 3px;
  color: #000;
  font-size: 12px;
  height: 24px;

  .selected {
    padding: 0 3px;
    border-radius: 3px;
    margin: 3px;
    color: #409eff;
    background-color: #fafafa;
    border: 1px solid #e8e8e8;
    text-align: center;
  }
}

.no-data {
  color: #c0c4cc;
}

.bar-i {
  height: 100%;
  width: 100%;
  padding: 2px 10px;
  overflow: auto;
  color: #606266;
  position: relative;

  &:hover {
    .remove-icon {
      display: block;
    }
  }
}

.remove-icon {
  position: absolute;
  right: 5px;
  top: 0;
  font-size: 14px;
  display: none;
  color: #aaa;
  cursor: pointer;
}

.opt-wrapper {
  color: #606266;
  position: absolute;
  top: 26px;
  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;
  overflow: auto;
  max-height: 200px;
  padding-bottom: 2px;

  .close {
    position: absolute;
    right: 10px;
    top: 12px;
    opacity: 0.6;

    &:hover {
      opacity: 1;
    }
  }
}

.opt {
  padding: 7px 15px;

  &.select-disabled {
    color: #409eff;
    cursor: not-allowed;
  }

  &:hover {
    background-color: #f5f5f5;
  }
}
</style>