浅谈Vue使用Cascader级联选择器数据回显中的坑

getChildrenList (fid, level = 0) {
 return new Promise((resolve, reject) => {
 API.getCategory({ fid: fid, level: level }).then(
  res => {
  if (res) {
  if (res.code === 0 && res.result) {
  resolve(res.result)
  }
  }
  }
 )
 })
 },
let twolist = this.getChildrenList(codeArr[0], 1)
let thirdlist = this.getChildrenList(codeArr[1], 2)
Promise.all([twolist, thirdlist]).then((data) => {
 ...
})

<template>
 <div>
 <el-cascader
 placeholder="请选择所属类目"
 :options="categoryList"
 :show-all-levels="false"
 v-model="category"
 collapse-tags
 :props="{
 multiple: true,
 value: 'code',
 label: 'name',
 children: 'children',
 ...props,
 }"
 />
 <el-cascader
 placeholder="请选择所属类目"
 :options="secondCategoryList"
 :show-all-levels="false"
 v-model="secondCategory"
 collapse-tags
 :props="{
 multiple: true,
 value: 'code',
 label: 'name',
 children: 'children',
 ...props,
 }"
 />
 </div>
</template>
 
<script>
export default {
 data () {
 return {
 categoryList: [],
 category: [],
 secondCategoryList: [],
 secondCategory: [],
 props: {
 lazy: true,
 // checkStrictly: true, // 父子级节点关联
 async lazyLoad (node, reso) {
  const { level, data } = node
  if (data && data.children && data.children.length !== 0) {
  return reso(node)
  }
  if (data && data.leaf) {
  return reso([])
  }
  const lv3Code = data ? data.code : null
  setTimeout(() => {
  lv3Code && API.getCategory({ fid: lv3Code, level: level }).then(
  res => {
  if (res) {
   if (res.code === 0 && res.result) {
   const nodes = res.result.map(item => ({ leaf: level === 2, ...item, children: [] }))
   data.children = nodes
   reso(nodes)
   } else {
   reso([])
   }
  }
  }
  )
  }, 500)
 }
 }
 }
 },
 mounted () {
 this.getCategory()
 this.initData()
 },
 methods: {
 initData () {
 let _that = this
 异步获取编辑数据。。。
 .then(result => {
 // 此处仅处理result中firstCategory和secondCategory均不为空的情况
 let firstTemp = _that.getCategoryListFormat(result.firstCategory, _that.categoryList)
 let secondTemp = _that.getCategoryListFormat(result.secondCategory, _that.secondCategoryList)
 let promiseArr = [firstTemp, secondTemp].filter(_ => _)
 Promise.all(promiseArr).then((formatRes) => {
  // 触发列表数据响应
  this.$set(_that.categoryList, formatRes[0].tragetCategoryList)
  this.$set(_that.secondCategoryList, formatRes[1].tragetCategoryList)
  _that.$nextTick(() => {
  // 数据加载完成后，在下一次循环中回显
  _that.category = formatRes[0].category
  _that.secondCategory = formatRes[1].category
  })
 })
 })
 },
 getCategoryListFormat (categorySelectList, tragetCategoryList) {
 return new Promise((resolve, reject) => {
 const category = []
 let flag = 0
 let counter = categorySelectList.length
 
 categorySelectList.forEach(v => { // 遍历已选择节点数据
  const oneNode = v
  const twoNode = v.children
  const threeNode = v.children.children
  const codeArr = [oneNode.code, twoNode.code, threeNode.code]
  category.push(codeArr)
  twoNode.children = twoNode.children ? twoNode.children : []
  let twolist = this.getChildrenList(codeArr[0], 1)
  let thirdlist = this.getChildrenList(codeArr[1], 2)
  Promise.all([twolist, thirdlist]).then((data) => {
  let twochildren = data[0]
  let threechildren = data[1]
  threechildren = threechildren.map(item => ({ leaf: true, ...item })) // 三级节点设置成叶子节点
  twoNode.children = threechildren
  tragetCategoryList.forEach(w => { // 遍历列表添加相应节点数据
  if (w.code === oneNode.code) {
  if (!w.children) {
   w.children = twochildren
  }
  w.children.forEach(item => {
   if (item.code === twoNode.code) {
   item.children = twoNode.children
   }
  })
  }
  })
  flag++
  if (flag === counter) {
  resolve({ tragetCategoryList, category })
  }
  })
 })
 })
 },
 getChildrenList (fid, level = 0) {
 return new Promise((resolve, reject) => {
 API.getCategory({ fid: fid, level: level }).then(
  res => {
  if (res) {
  if (res.code === 0 && res.result) {
  resolve(res.result)
  }
  }
  }
 )
 })
 },
 getCategory(fid = 0, level = 0) {
 API.getCategory({ fid: fid, level: level })
 .then(
  res => {
  if (res) {
  if (res.code == 0 && res.result) {
  this.categoryList = this.deepClone(res.result);
  }
  }
  }
 )
 },
 deepClone (source) { // 深拷贝
 if (!source && typeof source !== 'object') {
 throw new Error('error arguments', 'shallowClone')
 }
 const targetObj = source.constructor === Array ? [] : {}
 Object.keys(source).forEach(keys => {
 if (source[keys] && typeof source[keys] === 'object') {
  targetObj[keys] = source[keys].constructor === Array ? [] : {}
  targetObj[keys] = deepClone(source[keys])
 } else {
  targetObj[keys] = source[keys]
 }
 })
 return targetObj
 }
 }
}
</script> 
<style lang="less" scoped> 
</style>

import React from 'react';
import {Button, Form, message, Row, Tag,Select,Col} from 'antd';
import request from "../../../../utils/request";
const FormItem = Form.Item;
const Option = Select.Option;
 
class CarSeriesCascader extends React.Component {
 
 constructor(props) {
  super(props);
  this.state = {
   defaultBrandList:[],
   selectedCarModelList: props.carModelList ? props.carModelList : [],
   brandCode:null,
   carModelList:[],
   carId:null,
   modelCode:null,
   modelName:null
  }
 }
 
 componentDidMount() {
  let promise = request(`/car/getBrandList`);
  promise.then(result =>{
  if(result != null){
   this.setState({
   defaultBrandList:result
   });
  }else{
   message.error("获取品牌数据失败");
  }
  }).catch(err => {
   message.error("获取品牌数据失败");
  });
  // this.setState({
  // selectedCarModelList:(this.props.carModelList ? this.props.carModelList : [])
  // });
  this.handleChange(this.state.selectedCarModelList);
 }
 
 getLimitList = (selectedCarModelList) => {
  let limitList = selectedCarModelList.map((carModel,index) => {
   let limitItem = {};
   limitItem.modelName = carModel.modelName;
   limitItem.modelCode = carModel.modelCode;
   limitItem.carId = carModel.carId;
   return limitItem;
  });
  return limitList;
 } 
 
 addCarModel = () => {
  let addCarModel = {};
  let selectedCarModelList = this.state.selectedCarModelList;
  // 选中车型号
  if (this.state.carId !== null) {
   // 检查车型是否已选中
   for (let index = this.state.selectedCarModelList.length - 1; index >= 0; index--) {
    let carModel = this.state.selectedCarModelList[index];
    if (carModel.carId == this.state.carId) {
     message.error("车型已在已选车型中");
     return;
    }
   }
   addCarModel.carId = this.state.carId;
   addCarModel.modelCode = this.state.modelCode;
   addCarModel.modelName = this.state.modelName;
   selectedCarModelList.push(addCarModel);
  } else {
   return;
  }
  this.handleChange(selectedCarModelList);
  this.setState({
   selectedCarModelList
  });
 }
 
 handleChange = (selectedCarModelList) => {
  if (this.props.onChange) {
   let limitList = this.getLimitList(selectedCarModelList);
   this.props.onChange(limitList);
  }
 }
 
 deleteTag = (limitCode) => {
  debugger
  let selectedCarModelList = this.state.selectedCarModelList;
  selectedCarModelList = selectedCarModelList.filter(carModel => !(carModel.modelCode === limitCode));
  this.handleChange(selectedCarModelList);
  this.setState({selectedCarModelList});
 }
 
 //品牌变化
 brandChange = (brandName) => {
 this.state.defaultBrandList.map((item, index) => {
  if (item.brandName == brandName) {
  let promise = request(`/car/getModelList?brandCode=` + item.brandCode);
  promise.then(result =>{
   if(result != null){
   this.setState({
    brandCode:item.brandCode,
    carModelList:result
   });
   }else{
   message.error("获取车型数据失败");
   }
  }).catch(err => {
   message.error("获取车型数据失败:");
  });
  }
 });
 }
 
 //车型变化
 modelChange = (modelName) => {
 this.props.form.setFieldsValue({modelName: null});
 let _this = this;
 this.state.carModelList.map((item, index) => {
  if (item.modelName == modelName) {
  console.log(item);
  this.setState({
  modelCode : item.modelCode,
  carId : item.carId,
  modelName : item.modelName
  });
  }
 });
 }
 
 render() {
  const {getFieldDecorator} = this.props.form;
  //品牌名称列表
  let allBrandListOption = this.state.defaultBrandList != null ? this.state.defaultBrandList.map((item, index) => {
  return <Option value={item.brandName} key={index}>{item.brandName}</Option>;
  }) : null;
 
  //车型名称列表
  let allModelListOption = this.state.carModelList != null ? this.state.carModelList.map((item, index) => {
  return <Option value={item.modelName} key={index}>{item.modelName}</Option>;
  }) : null;
 
  const {
   closable=true,
  } = this.props;
 
  const existCarModel = [];
  const limitList = this.getLimitList(this.state.selectedCarModelList);
  for (let index = limitList.length - 1; index >= 0; index--) {
   let limitItem = limitList[index];
   existCarModel.push(<Tag
    key={limitItem.modelCode}
    closable={closable}
    onClose={(e) => {
     e.preventDefault();
     this.deleteTag(limitItem.modelCode);
    }}
   >{limitItem.modelName}</Tag>);
  }
 
  return (
   <div>
    <Row>
     <FormItem >
      {getFieldDecorator('brandName', {
      rules: [{
       message: '请选择品牌'
      }],
      })(
      <Select
       placeholder="品牌"
       dropdownMatchSelectWidth={false}
       onChange={this.brandChange}
       style={{ marginRight: 10, width: 100 }}>
       <Option value={null}>选择品牌</Option>
       {allBrandListOption}
      </Select>
      )}
      {getFieldDecorator('modelName', {
      rules: [{
       message: '请选择车型'
      }],
      })(
      <Select
       placeholder="车型"
       dropdownMatchSelectWidth={false}
       onChange={this.modelChange}
       style={{ marginRight: 10, width: 260 }}>
       <Option value={null}>选择车型</Option>
       {allModelListOption}
      </Select>
      )}
      <Button type={"primary"} icon={"plus"} onClick={this.addCarModel}>添加车型</Button>
     </FormItem>
    </Row>
    <Row>
     {existCarModel}
    </Row>
   </div>
  )
 }
} 
export default Form.create()(CarSeriesCascader);