zh_order_food_xcx/pages-takeout/shop-mod/menu.vue

<template>
	<view class="menu-box flex-justify-space">
		<scroll-view scroll-y="true" class="menu-box-left" :scroll-into-view="idMark" :scroll-with-animation='true'>
			<view class="menu-type-list-f">
				<view class="menu-type-list fs-28 fc-6 text-align-center" v-for="(item,i) in typeList" :key="i" @click="selectType(item)"
				:class="type ===  item.type?'bgc-BCEAFF':''"  :id="'scroll'+ item.type">
					{{item.name}}
					<view class="menu-type-num fc-f" v-show="item.num > 0">{{item.num > 99?'99+':item.num}}</view>
				</view>
			</view>
			
		</scroll-view>
		
		<scroll-view scroll-y="true" :scroll-with-animation='true' :scroll-into-view="idMark" @scroll="menuScroll">
			<view class="menu-box-right">
				<view class="menu-box-only" v-for="(item,i) in menuList" :key="i" :id="'scroll'+ item.type">
					<view class="mb-18 fs-24">{{item.name}}</view>
					<view class="menu-list" v-for="(info,k) in item.list" :key="k">
						{{info.name}}
					</view>
				</view>
			</view>
		</scroll-view>
	</view>
</template>

<script>
	
	export default {
		name:'menu-box',
		data(){
			return{
				idMark:'',//滚动自适应参数
				
				type:1,//分类标识
				typeList:[],
				
				menuList:[
					{	
						name:'分类1',
						type:1,
						list:[
							{name:1,},{name:2,},{name:3,},{name:4,},
						]
					},
					{
						name:'分类2',
						type:2,
						list:[
							{name:1,},{name:2,},{name:3,},{name:4,},
						]
					},
					{
						name:'分类3',
						type:3,
						list:[
							{name:1,},{name:2,},{name:3,},{name:4,},
						]
					},
					{
						name:'分类4',
						type:4,
						list:[
							{name:1,},{name:2,},{name:3,},{name:4,},
						]
					},
					{
						name:'分类5',
						type:5,
						list:[
							{name:1,},{name:2,},{name:3,},{name:4,},
						]
					},
				],
			}
		},
		mounted() {
			this.getTypeList();
		},
		methods:{
			getTypeList(){
				this.typeList = [
					{
						"category_id": 1,
						"name": "爆品推荐爆爆品推荐爆爆品推荐爆",
						"type": 1,
					},
					{
						"category_id": 2,
						"name": "必点口味必点口味必点口味必点口味必点口味",
						"type": 2
					},
					{
						"category_id": 3,
						"name": "爆品推荐爆爆品推荐爆爆品推荐爆",
						"type": 3,
					},
					{
						"category_id": 4,
						"name": "必点口味必点口味必点口味必点口味必点口味",
						"type": 4
					},
					{
						"category_id": 5,
						"name": "必点口味必点口味必点口味必点口味必点口味",
						"type": 5
					},
				]
				this.type = this.typeList[0].type;
				this.idMark = 'scroll'+ this.type;
				this.typeList.forEach((v)=>{
					v.num = 0
				})
			},
			
			selectType(item){
				if(this.type != item.type){
					this.type = item.type;
					this.idMark = 'scroll'+ item.type
				}
			},
			
			menuScroll(){
				let _this = this;
				let query = uni.createSelectorQuery().in(this);
				query.selectAll(".menu-box-only").boundingClientRect(data=>{
					data.forEach((v)=>{
						if(v.top < 297&&v.top>0){
							_this.idMark = v.id;
							let arr = v.id.split('scroll');
							_this.type = Number(arr[1]);
						}
					})
				}).exec();
			},
		},
	}
</script>

<style scoped lang="scss">
		.menu-box{
			height: 100%;
			.menu-box-left{
				width: 176rpx;
				height: 100%;
				background-color: #F7F8FA;
				border-radius: 0rpx 20rpx 0 0rpx;
				.menu-type-list-f{
					width: 176rpx;
					height: 100%;
					.menu-type-list{
						width: 176rpx;
						min-height: 10rpx;
						box-sizing: border-box;
						padding: 14rpx 32rpx;
						position: relative;
						.menu-type-num{
							position: absolute;
							top: 2rpx;
							right: 8rpx;
							padding: 0 6rpx;
							min-width: 20rpx;
							height: 32rpx;
							text-align: center;
							line-height: 32rpx;
							background: #FB3D03;
							border-radius: 50%;
						}
					}
				}
			}
			
			.menu-box-right{
				flex: 1;
				height: 100%;
				box-sizing: border-box;
				padding: 0 16rpx;
				.menu-list{
					width: 100%;
					height: 200rpx;
					margin-bottom: 40rpx;
					background-color: skyblue;
				}
			}
		}
</style>