Vue 動態數據實現 el-select 多級聯動、數據回顯

 

父組件
<ProviderCategory v-model="classificationId"></ProviderCategory>

import ProviderCategory from './ProviderCategory'
<script>
import ProviderCategory from './ProviderCategory'
export default {
  components: {
        ProviderCategory
  },
  data() {
    return {
      classificationId:111
    }
  },
</script>

子組件

<template>
    <div>
            <el-select class="form-width-160"  v-for="(item,idx) in selectedListArr.length" :key="idx"
                       v-model="selectedValueArr[idx]"
                       @change="(value)=>changeSelectData(value, idx )"
                       value-key="id"
            >
                <el-option v-for="item of selectedListArr[idx]"
                           :key="`${item.id}${idx}`" :label="item.categoryName"
                           :value="item"></el-option>
            </el-select>

    </div>
</template>

<script>
    export default {
        data () {
            return {
                classificationList: [],//一級目錄的數據，其實就是總的數據
                selectedListArr: [],//二維數組，每一級目錄的數據存入當前下標
                selectedValueArr: [],//一維數組，選中數據組成的數組對象
            }
        },
        props:{
            value : ''
        },
        created () {
            console.log(this.value)//父節點傳過來的數據
            this.getGoodsCategoryList()//初始化數據獲取所有的數據
        },
        methods: {
            //this.value如果有數據，調用該方法
            findId(arr1,id){//數據回顯
                var temp = []
                var arrId=[];
                let newArr=[];
                var forFn = function (arr, id) {
                    for (var i = 0; i < arr.length; i++) {
                        var item = arr[i]
                        if (item.id === id) {
                            newArr.unshift(arr);//二維數組，每一級目錄的數據存入當前下標
                            temp.unshift(item);//一維數組，選中數據組成的數組對象
                            arrId.unshift(id);//選中數據的id，包括父id
                            forFn(arr1, item.pId)
                            break
                        } else {
                            if (item.childNodes) {
                                forFn(item.childNodes, id)
                            }
                        }
                    }
                }
                forFn(arr1, id)
                this.selectedListArr = newArr;
                this.selectedValueArr = temp;
                console.log(newArr,"測試數據")
                console.log(temp,"數據")
                console.log(arrId,"id數據")
                // return temp
            },
            //加載數據
            initSelectArr(index){
                if(index == 0) {//當下標爲0時，其實就是新增的數據
                    this.selectedListArr = [this.classificationList];
                    this.selectedValueArr=[''];
                }else{//否則對數據進行處理，
                    this.selectedListArr = this.selectedListArr.slice(0, index+1);
                    this.selectedValueArr = this.selectedValueArr.slice(0, index+1);
                }

            },
            //選中數據後觸發的方法
            changeSelectData(item, idx) {
                console.log(item, idx);
                this.initSelectArr(idx);
                this.selectedValueArr[idx] = item;
                if(item.childNodes && item.childNodes.length>0){
                    this.selectedListArr.push(item.childNodes);
                    this.selectedValueArr.push('');
                }
            },
            //初始化數據獲取所有的數據
            getGoodsCategoryList() {
                let childNodes = [];//模擬後端傳過來的數據，在下面
                this.classificationList = childNodes;
                this.initSelectArr(0);//新增數據，頁面加載
                if(this.value && this.value !== ''){
                    this.findId(this.classificationList , this.value)
                }
                // this.$http.get('/test/testData', {
                //     params: {}
                // }).then(res => {
                //     res = res.data
                //     if (res.code === 200) {
                //         this.classificationList = res.data.childNodes
                //     } else {
                //         this.$message.error(res.msg)
                //     }
                // }).catch(err => {
                //     console.log(err)
                // })
            }
        }
    }
</script>

<style scoped>

</style>

//測試模擬數據
childNodes = [
                    {
                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                        categoryName: "上衣",
                        id:2,
                        pId: 1,
                        sort: 1,
                        childNodes: [
                            {
                                categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                categoryName: "短袖",
                                haveGoods: true,
                                id: 5,
                                pId: 2,
                                sort: 1,
                                childNodes:[
                                    {
                                        id:111,
                                        pId: 5,
                                        sort: 1,
                                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                        categoryName: "短袖褲子",
                                        childNodes: []
                                    },
                                    {
                                        id:122,
                                        pId: 5,
                                        sort: 1,
                                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                        categoryName: "短袖鞋子",
                                        childNodes: []
                                    }
                                ],
                            },
                            {
                                categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                categoryName: "西裝",
                                haveGoods: false,
                                id: 6,
                                pId: 2,
                                sort: 1,
                                childNodes:[
                                    {
                                        id:112,
                                        pId: 6,
                                        sort: 1,
                                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                        categoryName: "西裝褲子",
                                        childNodes: []
                                    },
                                    {
                                        id:121,
                                        pId: 6,
                                        sort: 1,
                                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                        categoryName: "西裝鞋子",
                                        childNodes: []
                                    }
                                ],
                            }
                        ]
                    },
                    {
                        id:11,
                        pId: 1,
                        sort: 1,
                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                        categoryName: "褲子",
                        childNodes: [
                            {
                                categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                categoryName: "牛仔",
                                haveGoods: true,
                                id: 112222,
                                pId: 11,
                                sort: 1,
                                childNodes:[],
                            },
                        ]
                    },
                    {
                        id:12,
                        pId: 1,
                        sort: 1,
                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                        categoryName: "鞋子",
                        childNodes: [
                            {
                                categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                categoryName: "耐克",
                                haveGoods: true,
                                id: 1121,
                                pId: 12,
                                sort: 1,
                                childNodes:[
                                     {
                                        categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                        categoryName: "西牛仔",
                                        haveGoods: true,
                                        id: 11211,
                                        pId: 1121,
                                        sort: 1,
                                        childNodes:[],
                                    },
                                ],
                            },
                            {
                                categoryImg: "https://www.baidu.com/img/bd_logo1.png",
                                categoryName: "阿迪",
                                haveGoods: true,
                                id: 1122,
                                pId: 12,
                                sort: 1,
                                childNodes:[],
                            },
                        ]
                    }
                ];