ysg/pages/category/category.vue

<template>
	<view class="content">
		<scroll-view scroll-y class="left-aside">
			<view v-for="item in flist" :key="item.id" class="f-item b-b" :class="{ active: item.id === currentId }"
				@click="tabtap(item)">{{ item.cate_name }}</view>
		</scroll-view>
		<scroll-view scroll-with-animation scroll-y class="right-aside" @scroll="asideScroll"
			:scroll-top="tabScrollTop">
			<view v-for="item in flist" :key="item.id" class="s-list" :id="'main-' + item.id">
				<text class="s-item">{{ item.cate_name }}</text>
				<view class="t-list ">
					<view @click="navToList(item.id, titem.id)" class="t-item" v-for="titem in item.children"
						:key="titem.id">
						<image :src="titem.pic"></image>
						<text>{{ titem.cate_name }}</text>
					</view>
				</view>
			</view>
		</scroll-view>
	</view>
</template>

<script>
	import {
		getCategoryList
	} from '@/api/product.js';
	// #ifdef H5
	import {
		weixinObj,
		shareLoad
	} from '@/utils/wxAuthorized';
	// #endif
	export default {
		data() {
			return {
				sizeCalcState: false,
				tabScrollTop: 0,
				currentId: 9,
				flist: [],
				mer_id: 0, //商户id
			};
		},
		onLoad() {
			this.loadData();
			// #ifdef H5
			shareLoad();
			// #endif
		},
		// 监听导航栏输入框点击事件
		onNavigationBarSearchInputClicked(e) {
			uni.navigateTo({
				url: '/pages/product/search'
			});
		},
		methods: {
			// 载入数据
			async loadData() {
				let obj = this;
				getCategoryList({})
					.then(({
						data
					}) => {
						obj.flist = data.map(function(s) {
							return s;
						});
					})
					.catch(err => {
						console.log(err);
					});
			},
			//一级分类点击
			tabtap(item) {
				console.log(item);
				// 判断有没有初始化页面高度对象数据
				if (!this.sizeCalcState) {
					this.calcSize();
				}
				// 获取当前点击的id
				this.currentId = item.id;
				console.log(item.top);
				this.tabScrollTop = item.top;
				console.log(this.tabScrollTop);
			},
			//右侧栏滚动
			asideScroll(e) {
				// 判断有没有初始化页面高度对象数据
				if (!this.sizeCalcState) {
					this.calcSize();
				}
				let scrollTop = e.detail.scrollTop;
				let box = 0; //列表包裹框高度初始化
				let bottom = 10; //距离页面底部多少像素左侧列表切换到最后一个一级分类
				// 查询当前页面对象
				let view = uni.createSelectorQuery().select('.content');
				view.fields({
						id: true,
						dataset: true,
						rect: true,
						size: true,
						scrollOffset: true
					},
					function(e) {
						// 保存包裹框高度
						box = e.height;
					}
				).exec();
				// 获取所有距离顶部大于滚轮距离页面高度的所有分类
				let tabs = this.flist.filter(item => (item.top - 10) <= scrollTop).reverse();
				if (tabs.length > 0) {
					// 判断是否已经到达滚轮底部
					if (box + scrollTop + bottom >= e.detail.scrollHeight) {
						this.currentId = this.flist[this.flist.length - 1].id;
					} else {
						this.currentId = tabs[0].id;
					}
				}
			},
			//计算右侧栏每个tab的高度等信息
			calcSize() {
				let h = 0;
				this.flist.forEach(item => {
					let view = uni.createSelectorQuery().select('#main-' + item.id);
					view.fields({
							size: true
						},
						data => {
							item.top = h;
							h += data.height;
							item.bottom = h;
						}
					).exec();
				});
				this.sizeCalcState = true;
			},
			navToList(sid, tid) {
				// 点击导航跳转到详细页面
				uni.navigateTo({
					url: '/pages/product/list?fid=' + this.currentId + '&sid=' + sid + '&tid=' + tid
				});
			}
		}
	};
</script>

<style lang="scss">
	page,
	.content {
		height: 100%;
		background-color: #f8f8f8;
	}

	.content {
		display: flex;
	}

	.left-aside {
		flex-shrink: 0;
		width: 200rpx;
		height: 100%;
		background-color: #fff;
	}

	.f-item {
		display: flex;
		align-items: center;
		justify-content: center;
		width: 100%;
		height: 100rpx;
		font-size: 28rpx;
		color: $font-color-base;
		position: relative;

		&.active {
			// color: $base-color;
			color: #000;
			font-weight: bold;
			background: #f8f8f8;

			&:before {
				content: '';
				position: absolute;
				left: 0;
				top: 50%;
				transform: translateY(-50%);
				height: 36rpx;
				width: 8rpx;
				background-color: $base-color;
				border-radius: 0 4px 4px 0;
				opacity: 0.8;
			}
		}
	}

	.right-aside {
		flex: 1;
		overflow: hidden;
		padding-left: 20rpx;
		padding-right: 20rpx;
	}

	.s-item {
		display: flex;
		align-items: center;
		height: 70rpx;
		padding-top: 8rpx;
		font-size: 28rpx;
		color: $font-color-dark;
	}

	.t-list {
		display: flex;
		flex-wrap: wrap;
		border-radius: 15rpx;
		width: 100%;
		background: #fff;
		padding-top: 12rpx;

		&:after {
			content: '';
			flex: 99;
			height: 0;
		}
	}

	.t-item {
		flex-shrink: 0;
		display: flex;
		justify-content: center;
		align-items: center;
		flex-direction: column;
		width: 171rpx;
		font-size: 26rpx;
		color: #666;
		padding-bottom: 20rpx;

		image {
			width: 140rpx;
			height: 140rpx;
		}
	}
</style>