element-plus/docs/examples/select/remote-search.vue

<template>
  <div class="flex flex-wrap">
    <div class="m-4">
      <p>default</p>
      <el-select
        v-model="value"
        multiple
        filterable
        remote
        reserve-keyword
        placeholder="Please enter a keyword"
        :remote-method="remoteMethod"
        :loading="loading"
        style="width: 240px"
      >
        <el-option
          v-for="item in options"
          :key="item.value"
          :label="item.label"
          :value="item.value"
        />
      </el-select>
    </div>
    <div class="m-4">
      <p>use remote-show-suffix</p>
      <el-select
        v-model="value"
        multiple
        filterable
        remote
        reserve-keyword
        placeholder="Please enter a keyword"
        remote-show-suffix
        :remote-method="remoteMethod"
        :loading="loading"
        style="width: 240px"
      >
        <el-option
          v-for="item in options"
          :key="item.value"
          :label="item.label"
          :value="item.value"
        />
      </el-select>
    </div>
  </div>
</template>

<script lang="ts" setup>
import { onMounted, ref } from 'vue'

interface ListItem {
  value: string
  label: string
}

const list = ref<ListItem[]>([])
const options = ref<ListItem[]>([])
const value = ref<string[]>([])
const loading = ref(false)

onMounted(() => {
  list.value = states.map((item) => {
    return { value: `value:${item}`, label: `label:${item}` }
  })
})

const remoteMethod = (query: string) => {
  if (query) {
    loading.value = true
    setTimeout(() => {
      loading.value = false
      options.value = list.value.filter((item) => {
        return item.label.toLowerCase().includes(query.toLowerCase())
      })
    }, 200)
  } else {
    options.value = []
  }
}

const states = [
  'Alabama',
  'Alaska',
  'Arizona',
  'Arkansas',
  'California',
  'Colorado',
  'Connecticut',
  'Delaware',
  'Florida',
  'Georgia',
  'Hawaii',
  'Idaho',
  'Illinois',
  'Indiana',
  'Iowa',
  'Kansas',
  'Kentucky',
  'Louisiana',
  'Maine',
  'Maryland',
  'Massachusetts',
  'Michigan',
  'Minnesota',
  'Mississippi',
  'Missouri',
  'Montana',
  'Nebraska',
  'Nevada',
  'New Hampshire',
  'New Jersey',
  'New Mexico',
  'New York',
  'North Carolina',
  'North Dakota',
  'Ohio',
  'Oklahoma',
  'Oregon',
  'Pennsylvania',
  'Rhode Island',
  'South Carolina',
  'South Dakota',
  'Tennessee',
  'Texas',
  'Utah',
  'Vermont',
  'Virginia',
  'Washington',
  'West Virginia',
  'Wisconsin',
  'Wyoming',
]
</script>