uniapp使用uview的垂直分类，双向联动
<template>
<view class="u-wrap">
<view class="u-menu-wrap">
<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop"
:scroll-into-view="itemId">
<view v-for="(item, index) in tabbar" :key="index" class="u-tab-item"
:class="[current == index ? 'u-tab-item-active' : '']" @="swichMenu(index)">
<text class="u-line-1">{{ }}</text>
</view>
</scroll-view>
<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box"
@scroll="rightScroll">
<view class="page-view">
<view class="class-item" :id="'item' + index" v-for="(item, index) in tabbar" :key="index">
<view class="item-title">
<text>{{ }}</text>
</view>
<view class="item-container">
<view class="thumb-box" v-for="(item1, index1) in " :key="index1">
<u-image class="item-menu-image" :src="" width="120rpx" height="120rpx"
mode="aspectFit"></u-image>
<view class="item-menu-name">{{ }}</view>
</view>
</view>
</view>
</view>
</scroll-view>
</view>
</view>
</template>
<script lang="ts">
import {Vue,Prop,Component} from 'vue-property-decorator';
import {xx} from '@/api/xx';
@Component({})
export default class Categories extends Vue {
private scrollTop = 0;
private oldScrollTop = 0;
private current = 0;
private menuHeight = 0;
private menuItemHeight = 0;
private itemId = '';
private tabbar = [];
private menuItemPos = [];
private arr: number[] = [];
private scrollRightTop = 0;
private timer: number | null = null;
private loading = true;
onLoad(options: {current: string}) {
this.init(options.current || '0');
}
onReady() {}
async init(index: string) {
this.loading = true;
const res = await xx();
this.tabbar = res;
this.loading = false;
this.$nextTick(async () => {
await this.getMenuItemTop();
this.swichMenu(Number(index));
});
}
// 点击左边的栏目切换
async swichMenu(index: number) {
if (this.arr.length == 0) {
await this.getMenuItemTop();
}
if (index == this.current) return;
this.scrollRightTop = this.oldScrollTop;
this.$nextTick(function() {
this.scrollRightTop = this.arr[index];
this.current = index;
this.leftMenuStatus(index);
});
}
// 获取一个目标元素的高度
getElRect(elClass: string, dataVal ? : 'menuHeight' | 'menuItemHeight') {
new Promise((resolve, reject) => {
const query = uni.createSelectorQuery().in(this);
query
.select('.' + elClass)
.fields({
size: true
},
res => {
// 如果节点尚未生成，res值为null，循环调用执行
if (!res) {
setTimeout(() => {
this.getElRect(elClass);
}, 10);
return;
}
this[dataVal!] = res.height!;
resolve(true);
}
)
.exec();
});
}
// 观测元素相交状态
async observer() {
this.tabbar.map((val, index) => {
let observer = uni.createIntersectionObserver(this);
// 检测右边scroll-view的id为itemxx的元素与right-box的相交状态
// 如果跟.right-box底部相交，就动态设置左边栏目的活动状态
observer
.relativeTo('.right-box', {
top: 0
})
.observe('#item' + index, res => {
if (res.intersectionRatio > 0) {
let id = (res as any).id.substring(4);
this.leftMenuStatus(id);
}
});
});
}
// 设置左边菜单的滚动状态
async leftMenuStatus(index: number) {
this.current = index;
// 如果为0，意味着尚未初始化
if (this.menuHeight == 0 || this.menuItemHeight == 0) {
await this.getElRect('menu-scroll-view', 'menuHeight');
await this.getElRect('u-tab-item', 'menuItemHeight');
}
// 将菜单活动item垂直居中
this.scrollTop =
index * this.menuItemHeight +
this.menuItemHeight / 2 -
this.menuHeight / 2;
}
// 获取右边菜单每个item到顶部的距离
getMenuItemTop() {
new Promise(resolve => {
let selectorQuery = uni.createSelectorQuery();
selectorQuery
.selectAll('.class-item')
.boundingClientRect((rects: any) => {
// 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
if (!rects.length) {
setTimeout(() => {
this.getMenuItemTop();
}, 10);
return;
}
rects.forEach((rect: any) => {
// 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
this.arr.push(rect.top - rects[0].top);
resolve(true);
});
})
.exec();
});
}
// 右边菜单滚动
async rightScroll(e: any) {
this.oldScrollTop = e.detail.scrollTop;
// = ;
if (this.arr.length == 0) {
await this.getMenuItemTop();
}
if (this.timer) return;
if (!this.menuHeight) {
await this.getElRect('menu-scroll-view', 'menuHeight');
}
this.timer = setTimeout(() => {
// 节流
this.timer = null;
// scrollHeight为右边菜单垂直中点位置,当每一项的元素较少时，会产生错位的情况
// let scrollHeight = + / 2;
// scrollHeight为右边菜单顶点位置
let scrollHeight = e.detail.scrollTop + this.menuItemHeight / 2;
for (let i = 0; i < this.arr.length; i++) {
let height1 = this.arr[i];
let height2 = this.arr[i + 1];
// 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
if (!height2 || (scrollHeight >= height1 && scrollHeight < height2)) {
this.leftMenuStatus(i);
return;
}
}
}, 10);
}
}
</script>
<style lang="scss" scoped>
.u-wrap {
height: calc(100vh);
/* #ifdef H5 */
height: calc(100vh - var(--window-top));
/* #endif */
display: flex;
flex-direction: column;
}
.u-search-box {
padding: 18rpx 30rpx;
}
.u-menu-wrap {
flex: 1;
display: flex;
overflow: hidden;
}
.u-search-inner {
background-color: rgb(234, 234, 234);
border-radius: 100rpx;
display: flex;
align-items: center;
padding: 10rpx 16rpx;
}
.u-search-text {
font-size: 26rpx;
color: $u-tips-color;
margin-left: 10rpx;
}
.u-tab-view {
width: 250rpx;
height: 100%;
}
.u-tab-item {
height: 110rpx;
background: #f6f6f6;
box-sizing: border-box;
display: flex;
align-items: center;
justify-content: center;
font-size: 26rpx;
color: #444;
font-weight: 400;
line-height: 1;
}
.u-tab-item-active {
position: relative;
color: #000;
font-size: 30rpx;
font-weight: 600;
background: #fff;
}
.u-tab-item-active::before {
content: '';
position: absolute;
border-left: 4px solid $main-color;
height: 32rpx;
left: 0;
top: 39rpx;
}
.u-tab-view {
height: 100%;
}
.right-box {
background-color: rgb(250, 250, 250);
}
.page-view {
padding: 16rpx;
}
.class-item {
margin-bottom: 30rpx;
background-color: #fff;
padding: 16rpx;
border-radius: 8rpx;
}
.class-item:last-child {
min-height: 100vh;
}
.item-title {
font-size: 26rpx;
color: $u-main-color;
font-weight: bold;
}
.item-menu-name {
font-weight: normal;
font-size: 24rpx;
color: $u-main-color;
}
.item-container {
display: flex;
flex-wrap: wrap;
}
.thumb-box {
width: 33.333333%;
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
margin-top: 20rpx;
}
.item-menu-image {
width: 120rpx;
height: 120rpx;
}
</style>