antdesign-vue 3.0 二次封装 a-select 支持多个v-model

<template>
  <a-select
    v-model:value="valueId"
    v-bind="getBindValues"
    show-search
    :filter-option="false"
    :options="options"
    @search="handleSearch"
    @popupScroll="popupScroll"
    @change="handelChange"
    style="min-width: 200px"
  >
    <template #notFoundContent>
      <a-spin size="small" v-if="fetching" />
      <a-empty v-else />
    </template>
    <template #dropdownRender="{ menuNode: menu }" v-if="isSelectAll">
      <v-nodes :vnodes="menu" />
      <a-divider style="margin: 4px 0" />
      <div
        style="
          padding: 4px 8px;
          cursor: pointer;
          display: flex;
          justify-content: space-between;
          width: 100%;
        "
        @mousedown="(e) => e.preventDefault()"
      >
        <a-button type="link" @click="selectAll">全选</a-button>
        <a-button type="link" @click="clearAll">清空</a-button>
      </div>
    </template>
    <template #[item]="data" v-for="item in Object.keys($slots)" :key="item">
      <slot :name="item" v-bind="data || {}"></slot>
    </template>
  </a-select>
</template>
<script>
import { defineComponent, reactive, toRefs, watch, useAttrs } from 'vue';
import { Select } from 'ant-design-vue';
import { debounce } from 'lodash-es';
export default defineComponent({
  name: 'SelectSearch',
  components: {
    VNodes: (_, { attrs }) => {
      return attrs.vnodes;
    },
  },
  props: Object.assign(Select.props, {
    data: {
      type: Function,
      default: () => {},
    },
    fieldNames: {
      type: Object,
      default: () => {
        return { label: 'label', value: 'value', options: 'options' };
      },
    },
    allowClear: {
      type: Boolean,
      default: true,
    },
    pager: {
      type: Object,
      default: {},
    },
    searchKey: {
      type: String,
      default: '',
    },
    isSelectAll: {
      type: Boolean,
      default: false,
    },
  }),

  setup(props, { emit }) {
    const attrs = useAttrs();
    const getBindValues = computed(() => {
      let propsData = {
        class: 's-select-warp',
        ...props,
      };
      return propsData;
    });

    const valueId = computed({
      get: () => {
        handelMoreVmodel(props.value) // 处理多个v-model
        return props.value;
      },
      set: (val) => {
        emit('update:value', val);
      },
    });

    const state = reactive({
      options: [],
      fetching: false,
      total: 0,
      fetchId: 0,
      parmas: {},
      lastFetchId: 0,
      pager: props.pager || {},
    });

    // 多个vmodel处理方法
    const handelMoreVmodel = (val) => {
      let arr = [];
      for (let i in attrs) {
        if (i.toString().indexOf('onUpdate') > -1) {
          arr.push(i);
        }
      }
      // 找到 val 对应的item
      let item = state.options.find((item) => {
        return item[props.fieldNames.value] === val;
      });
      arr.forEach((s) => {
        const key = s.split(':')[1];
        if (item) {
          emit(`update:${key}`, item[key] || '');
        } else {
          emit(`update:${key}`, '');
        }
      });
    };

    // 重置
    const reset = () => {
      if (props.searchKey) state.parmas[props.searchKey] = '';
      if (state.pager.pageNum) state.pager.pageNum = 1;
      state.options = [];
      getList();
    };

    // 接口获取数据方法
    const getList = () => {
      state.fetching = true;
      if (props.data) {
        const result = props.data(Object.assign(state.pager, state.parmas));
        result.then((res) => {
          if (res.code === 0) {
            state.total = res.total;
            state.options = state.options.concat(res.data);
            state.fetching = false;
          }
        });
      }
    };

    // 有分页时下拉加载数据
    const popupScroll = (e) => {
      if (state.pager.pageNum) {
        const { target } = e;
        const scrllHeight = target.scrollHeight - target.scrollTop;
        const clientHeight = target.clientHeight;
        // 下拉框不下拉的时候
        if (scrllHeight === 0 && clientHeight === 0) {
          state.pager.pageNum = 1;
        } else if (scrllHeight - clientHeight == 0) {
          // 下拉到底部时
          if (state.options.length < state.total) {
            // 如果滑到底部，则加载下一页
            state.pager.pageNum++;
            getList();
          }
        }
      }
    };

    const handelChange = (value) => {
      // 清空时重新获取数据
      if (!value) {
        reset();
      }
    };

    // 节流查询
    const handleSearch = debounce((value) => {
      state.lastFetchId += 1;
      if (state.pager.pageNum) state.pager.pageNum = 1;
      if (props.searchKey) state.parmas[props.searchKey] = value; // 查询Key
      state.fetchId = state.lastFetchId;
      state.options = [];
      if (state.fetchId !== state.lastFetchId) {
        return;
      }
      getList();
    }, 800);

    // 全选
    const selectAll = () => {
      let vals = state.options.map((item) => item[props.fieldNames.value]);
      emit('update:value', vals);
    };

    // 清空
    const clearAll = () => {
      emit('update:value', []);
    };

    getList();

    return {
      ...toRefs(state),
      handleSearch,
      handelChange,
      getList,
      popupScroll,
      getBindValues,
      valueId,
      selectAll,
      clearAll,
    };
  },
});
/**
 * selectDictTypeList : 调用后台接口方法 Promise

 * 无分页 

 * 有分页  

 * 指定label/key 

 * 全选/清空  

 * slot   
            
          

* 多个v-model（单选）
            
            
 */
</script>