• 分类选择，最多五级

    效果图，这种竖向的分类选择，每一列可以用不同的背景颜色
    在这里插入图片描述

    组件代码

    <template>
	<view class="toolTypeBox" :style="`max-height:${maxHeight}`">
		<block v-for="(item,index) in datalist">
			<block v-if="item.list.length>0">
				<view>
					<scroll-view scroll-y class="toolType-each" :style="`background-color: ${item.bgcolor};max-height:${maxHeight}`">
						<view>
							<view v-for="(ite,inde) in item.list" :key="ite[idValue]" class="toolType-each-box" :class="[pip(index,inde)&&ite[idValue]==nowObject[idValue]?'active':'',item.current===inde?'moactive':'']" @tap="changeTab(index,inde)">{{ite[nameValue]}}</view>
						</view>
					</scroll-view>
				</view>
			</block>
		</block>
	</view>
</template>

<script>
	export default{
		name:'tool-type',
		data(){
			return{
				datalist:[
					{
						list:[],
						current:0,
						bgcolor:'#ECECEC',
					},
					{
						list:[],
						current:0,
						bgcolor:'#F8F8F8',
					},
					{
						list:[],
						current:0,
						bgcolor:'#FFF',
					},
					{
						list:[],
						current:0,
						bgcolor:'#FFF',
					},
					{
						list:[],
						current:0,
						bgcolor:'#FFF',
					},
				],
				nowCurrent:[null,null],//当前选中
				nowObject:{},//当前选中个的数据
			}
		},
		props:{
			dataList:{
				type:Array,
				default:() =>{
					return []
				}
			},
			//默认选中id
			defaultId:{
				type:String|Number,
				default:''
			},
			maxHeight:{
				type:String,
				default:'800rpx'
			},
			parentIdValue:{
				type:String,
				default:'parentId'
			},
			idValue:{
				type:String,
				default:'id'
			},
			nameValue:{
				type:String,
				default:'name'
			},
			childrenValue:{
				type:String,
				default:'children'
			},
		},
		methods:{
			//获取默认id在数组中的位置
		  	getParent(data2, nodeId2) {
			      var arrRes = [];
			      if (data2.length == 0) {
			        if (!!nodeId2) {
			          arrRes.unshift(data2);
			        }
			        return arrRes;
			      }
			      let rev = (data, nodeId) => {
			        for (var i = 0, length = data.length; i < length; i++) {
			          let node = data[i];
			          if (node[this.idValue] == nodeId) {
			            arrRes.unshift(i);
			            rev(data2, node[this.parentIdValue]);
			            break;
			          } else {
			            if (!!node[this.childrenValue]) {
			              rev(node[this.childrenValue], nodeId);
			            }
			          }
			        }
			        return arrRes;
			      };
			      arrRes = rev(data2, nodeId2);
			      return arrRes;
		    },
			mate(list){
				let aaa = this.getParent(list,this.defaultId)
				//没有该id时，清空选中的位置
				if(!aaa || aaa.length == 0){
					this.nowCurrent = [null,null];
					this.changeTab(0,0,'noId')
					return
				}
				let bbb = [];
				aaa.map((r,v) =>{
					this.datalist[v].current = r;
					if(v === 0){
						let ll = this.datalist[0].list[aaa[0]][this.childrenValue];
						bbb = ll;
						this.datalist[v+1].list = ll;
					}else{
						let ll = bbb[r][this.childrenValue];
						bbb = ll;
						this.datalist[v+1].list = ll;
					}
					//将默认选中ID的子集展示出来
					if(v === aaa.length-1){
						this.changeTab(aaa.length-1,aaa[aaa.length-1],'zidong')
					}
				})
			},
			//获取已选中的Id
			getSelectId(){
				return this.nowObject;
			},
			pip(i,v){
				if(this.nowCurrent[0] === i && this.nowCurrent[1] === v){
					return true
				}else{
					return false
				}
			},
			//选择
			changeTab(i,v,s){
				console.log('选择',i,v)
				switch(i){
					case 0:
						//第一层
						if(this.datalist[i].list){
							
							// if(v === this.datalist[i].current)return;
							this.datalist[i].current = v;
							this.datalist[1].current = 0;
							this.datalist[2].current = 0;
							this.datalist[3].current = 0;
							this.datalist[4].current = 0;
							this.datalist[1].list = [];
							this.datalist[2].list = [];
							this.datalist[3].list = [];
							this.datalist[4].list = [];
							let aa = this.datalist[i].list[v][this.childrenValue];
							if(aa?.length>0){
								this.datalist[1].list = aa;
								let bb = aa[0][this.childrenValue];
								if(bb?.length>0){
									this.datalist[2].list = bb;
									let cc = bb[0][this.childrenValue];
									if(cc?.length>0){
										this.datalist[3].list = cc;
										let dd = cc[0][this.childrenValue];
										if(dd?.length>0){
											this.datalist[4].list = dd;
										}
									}
								}
								console.log('叔叔叔苏火速火速',this.datalist)
							}else{
								if(s !== 'noId'){
									this.nowCurrent[0] = i;
									this.nowCurrent[1] = v;
									if(s !== 'zidong'){
										this.$emit('selectType',this.datalist[i].list[v])
										this.nowObject = this.datalist[i].list[v];
									}
								}
							}
						}else{
							this.nowCurrent[0] = i;
							this.nowCurrent[1] = null;
						}
						break
					case 1:
						//第二层
						if(this.datalist[i].list){
							
							// if(v === this.datalist[i].current)return;
							this.datalist[i].current = v;
							this.datalist[2].current = 0;
							this.datalist[3].current = 0;
							this.datalist[4].current = 0;
							this.datalist[2].list = [];
							this.datalist[3].list = [];
							this.datalist[4].list = [];
							let aa = this.datalist[i].list[v][this.childrenValue];
							if(aa?.length>0){
								this.datalist[2].list = aa;
								let bb = aa[0][this.childrenValue];
								if(bb?.length>0){
									this.datalist[3].list = bb;
									let cc = bb[0][this.childrenValue];
									if(cc?.length>0){
										this.datalist[4].list = cc;
									}
								}
							}else{
								if(s !== 'noId'){
									this.nowCurrent[0] = i;
									this.nowCurrent[1] = v;
									if(s !== 'zidong'){
										this.$emit('selectType',this.datalist[i].list[v])
										this.nowObject = this.datalist[i].list[v];
									}
								}
							}
						}else{
							this.nowCurrent[0] = i;
							this.nowCurrent[1] = null;
						}
						break
					case 2:
						//第三层
						if(this.datalist[i].list){
							
							// if(v === this.datalist[i].current)return;
							this.datalist[i].current = v;
							this.datalist[3].current = 0;
							this.datalist[4].current = 0;
							this.datalist[3].list = [];
							this.datalist[4].list = [];
							let aa = this.datalist[i].list[v][this.childrenValue];
							if(aa?.length>0){
								this.datalist[3].list = aa;
								let bb = aa[0][this.childrenValue];
								if(bb?.length>0){
									this.datalist[4].list = bb;
								}
							}else{
								if(s !== 'noId'){
									this.nowCurrent[0] = i;
									this.nowCurrent[1] = v;
									if(s !== 'zidong'){
										this.$emit('selectType',this.datalist[i].list[v])
										this.nowObject = this.datalist[i].list[v];
									}
								}
							}
						}else{
							this.nowCurrent[0] = i;
							this.nowCurrent[1] = null;
						}
						break
					case 3:
						//第四层
						if(this.datalist[i].list){

							// if(v === this.datalist[i].current)return;
							this.datalist[i].current = v;
							this.datalist[4].current = 0;
							this.datalist[4].list = [];
							let aa = this.datalist[i].list[v][this.childrenValue];
							if(aa?.length>0){
								this.datalist[4].list = aa;
							}else{
								if(s !== 'noId'){
									this.nowCurrent[0] = i;
									this.nowCurrent[1] = v;
									if(s !== 'zidong'){
										this.$emit('selectType',this.datalist[i].list[v])
										this.nowObject = this.datalist[i].list[v];
									}
								}
							}
						}else{
							this.nowCurrent[0] = i;
							this.nowCurrent[1] = null;
						}
						break
					case 4:
						//第五层
						if(this.datalist[i].list){
							
							// if(v === this.datalist[i].current)return;
							this.datalist[i].current = v;
							if(s !== 'noId'){
								this.nowCurrent[0] = i;
								this.nowCurrent[1] = v;
								if(s !== 'zidong'){
									this.$emit('selectType',this.datalist[i].list[v])
									this.nowObject = this.datalist[i].list[v];
								}
							}
						}else{
							this.nowCurrent[0] = i;
							this.nowCurrent[1] = null;
						}
						break
				}
			}
		},
		watch:{
			dataList:{
				immediate:true,
				handler(newlist){
					// console.log('来了',newlist)
					if(this.defaultId&&newlist.length>0){
						this.datalist[0].list = newlist;
						this.mate(newlist) //匹配选中默认id
					}else{
						if(newlist?.length>0){
							this.datalist[0].list = newlist;
							let aa = newlist[0][this.childrenValue];
							if(aa?.length>0){
								this.datalist[1].list = aa;
								let bb = aa[0][this.childrenValue];
								if(bb?.length>0){
									this.datalist[2].list = bb;
									let cc = bb[0][this.childrenValue];
									if(cc?.length>0){
										this.datalist[3].list = cc;
										let dd = cc[0][this.childrenValue];
										if(dd?.length>0){
											this.datalist[4].list = dd;
										}
									}
								}
							}
						}else{
							this.datalist[0].list = [];
							this.datalist[0].current = 0;
							this.datalist[1].list = [];
							this.datalist[1].current = 0;
							this.datalist[2].list = [];
							this.datalist[2].current = 0;
							this.datalist[3].list = [];
							this.datalist[3].current = 0;
							this.datalist[4].list = [];
							this.datalist[4].current = 0;
						}
					}
				}
			},
			defaultId:{
				immediate:true,
				handler(newid){
					// console.log('默认',newid)
					if(this.dataList.length>0){
						this.mate(this.dataList) //匹配选中默认id
					}
				}
			}
		},
	}
</script>

<style lang="scss">
	.toolTypeBox{
		// width:100%;
		// height:100%;
		display: flex;
		background:#fff;
	}
	.toolType-each{
		width:220rpx;
	}
	.toolType-each-box{
		width:100%;
		padding:26rpx 20rpx;
		box-sizing: border-box;
		font-size: 30rpx;
		color: #666;
		text-align: center;
		word-break:break-all;
	}
	.moactive{
		background-color:#fff;
	}
	.active{
		background-color:#FFC526;
		color:#fff;
	}
</style>

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  • 原文地址：https://blog.csdn.net/m0_46978096/article/details/133886073