daimp-front/sub-government-affairs-service/src/components/UrlSelect/index.vue

<!-- components/UrlSelect.vue -->
<template>
  <el-select
    v-bind="$attrs"
    v-model="internalValue"
    @change="$emit('change', $event)"
    @blur="$emit('blur', $event)"
    @focus="$emit('focus', $event)"
    @clear="$emit('clear', $event)"
    @visible-change="$emit('visible-change', $event)"
    @remove-tag="$emit('remove-tag', $event)"
    @scroll="$emit('scroll', $event)"
  >
    <template v-for="(_, name) in $slots" #[name]="scopedData">
      <slot :name="name" v-bind="scopedData"> </slot>
    </template>
    <slot name="option-group">
      <el-option v-for="item in options" :key="item[valueKey]" :label="item[labelKey]" :value="item[valueKey]" />
    </slot>
  </el-select>
</template>

<script setup>
import { ref, watch, onMounted } from 'vue';
import request from '@/utils/axios';

// -------------- ① 定义要继承/自定义的 Props  --------------
const props = defineProps({
  modelValue: {
    type: [String, Number, Array],
    default: null,
  },
  url: {
    type: String,
    default: null,
  },
  params: {
    type: Object,
    default: () => ({}),
  },
  // 可按需让上层指定 label 字段名、value 字段名
  labelKey: {
    type: String,
    default: 'label',
  },
  valueKey: {
    type: String,
    default: 'value',
  },
  responseParser: {
    type: Function,
    default: (res) => res.data.records, // 默认解析函数
  },
});

// -------------- ② 定义要透传回父组件的 Events  --------------
const emit = defineEmits(['update:modelValue', 'change', 'blur', 'focus', 'clear', 'visible-change', 'remove-tag', 'scroll']);

// -------------- ③ 内部双向绑定  --------------
// 用一个 ref 存储内部的值
const internalValue = ref(props.modelValue);
// 当 prop 变化时，同步到 internalValue
watch(
  () => props.modelValue,
  (newVal) => {
    internalValue.value = newVal;
  }
);
// 当 internalValue 变化时，emit update:modelValue
watch(internalValue, (newVal) => {
  emit('update:modelValue', newVal);
});

// -------------- ④ 选项列表  --------------
const options = ref([]);

// -------------- ⑤ 请求数据的函数  --------------
async function fetchOptions() {
  // console.log('fetchOptions :>> ', props.url, props.params);
  if (!props.url) return;
  const res = await request.get(props.url, { params: props.params });

  const records = props.responseParser(res);
  if (Array.isArray(records)) {
    options.value = records;
    //   console.log('option', options.value);
  } else {
    options.value = [];
    console.error('UrlSelect：解析后的数据不是数组');
  }
}

// -------------- ⑥ 生命周期：组件挂载后立即拉一次数据  --------------
onMounted(() => {
  fetchOptions();
});
</script>