uniapp實(shí)現(xiàn)左右聯(lián)動(dòng)商品分類頁(yè)面
零、前因
我們?cè)谌粘5拈_發(fā)種,這種頁(yè)面在項(xiàng)目當(dāng)中經(jīng)常會(huì)用得到,所以本篇文章會(huì)比較注重描述其思路,順帶附上其代碼,以便以后在任何代碼環(huán)境下都能使用上,先介紹一下實(shí)現(xiàn)思路:
- 點(diǎn)擊左側(cè)類別,右側(cè)會(huì)跳轉(zhuǎn)到對(duì)應(yīng)的分類;
- 右側(cè)滾動(dòng)到頂部區(qū)域,左側(cè)自動(dòng)高亮對(duì)應(yīng)的類別。
要求就這么多,可以先看下效果如何:

一、搭建結(jié)構(gòu)
重點(diǎn):使用uniapp的scroll-view組件,如果是小程序原生開發(fā)也是這個(gè)組件;其次如果是html開發(fā),就自己實(shí)現(xiàn)一個(gè)溢出滾動(dòng)。
廢話不多說(shuō),上代碼:
<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' : '']"
@tap.stop="swichMenu(index)">
<text class="u-line-1">{{item.name}}</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>{{item.name}}</text>
</view>
<view class="item-container">
<view class="thumb-box" v-for="(item1, index1) in item.foods" :key="index1" @click="featureC(item1.cat, item1.name)">
<image v-if="item1.icon != ''" class="item-menu-image" :src="item1.icon" mode=""></image>
<view v-else class="item-menu-image row-c" style="background-color: #F4F6F8;"><text style="font-size: 20rpx;color: #d0d0d0;">加載失敗</text></view>
<view class="item-menu-name">{{item1.name}}</view>
</view>
</view>
</view>
</view>
</scroll-view>
</view>
</view>
</template>JavaScript業(yè)務(wù)邏輯代碼:
data() {
return {
scrollTop: 0, //tab標(biāo)題的滾動(dòng)條位置
oldScrollTop: 0, // tab標(biāo)題的滾動(dòng)條舊位置
current: 0, // 預(yù)設(shè)當(dāng)前項(xiàng)的值
menuHeight: 0, // 左邊菜單的高度
menuItemHeight: 0, // 左邊菜單item的高度
itemId: '', // 欄目右邊scroll-view用于滾動(dòng)的id
tabbar: JSON.parse(uni.getStorageSync('categroy')), // 渲染的數(shù)據(jù),放在最后供你們測(cè)試
arr: [], // 儲(chǔ)存距離頂部高度的數(shù)組
scrollRightTop: 0, // 右邊欄目scroll-view的滾動(dòng)條高度
timer: null // 定時(shí)器
}
}
CSS代碼:
.u-wrap {
/* #ifdef H5 */
height: calc(100vh - var(--window-top));
/* #endif */
display: flex;
flex-direction: column;
height: 100vh;
}
.u-search-box {
padding: 18rpx 30rpx;
}
.u-menu-wrap {
flex: 1;
display: flex;
overflow: hidden;
}
.u-tab-view {
width: 200rpx;
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: #06A446;
font-size: 30rpx;
font-weight: 500;
background: #D6FFE7;
}
.u-tab-item-active::before {
content: "";
position: absolute;
border-left: 4px solid #06A446;
height: 52rpx;
left: 0;
top: 29rpx;
}
.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 {
margin-top: 8rpx;
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;
}二、添加邏輯層業(yè)務(wù)
分別獲取左側(cè)和右側(cè)每一個(gè)類別的高度
我們知道,在uniapp里面沒(méi)有window對(duì)象和dom元素,所以如果我們要獲取頁(yè)面上的一些節(jié)點(diǎn)信息時(shí),需要通過(guò)
uni.createSelectorQuery()這個(gè)API來(lái)獲取,這里不再贅述。—— 《傳送地址》
/**
* 獲取一個(gè)目標(biāo)元素的高度
* @elClass 元素的類名
* @dataVal 儲(chǔ)存高度的對(duì)象
*/
methods: {
getElRect(elClass, dataVal) {
new Promise((resolve, reject) => {
const query = uni.createSelectorQuery().in(this);
query.select('.' + elClass).fields({
size: true
}, res => {
// 如果節(jié)點(diǎn)尚未生成,res值為null,循環(huán)調(diào)用執(zhí)行
if (!res) {
setTimeout(() => {
this.getElRect(elClass);
}, 10);
return;
}
this[dataVal] = res.height;
resolve();
}).exec();
})
}
}
計(jì)算右側(cè)每個(gè)分類距離頂部的高度并保存
onReady() {
this.getMenuItemTop()
},
mehods: {
/**
* 獲取右邊菜單每個(gè)item到頂部的距離
* 儲(chǔ)存到 arr 數(shù)組里面用于后面滾動(dòng)判斷
*/
getMenuItemTop() {
new Promise(resolve => {
let selectorQuery = uni.createSelectorQuery();
selectorQuery.selectAll('.class-item').boundingClientRect((rects) => {
// 如果節(jié)點(diǎn)尚未生成,rects值為[](因?yàn)橛胹electAll,所以返回的是數(shù)組),循環(huán)調(diào)用執(zhí)行
if(!rects.length) {
setTimeout(() => {
this.getMenuItemTop();
}, 10);
return ;
}
rects.forEach((rect) => {
// 視情況而定,這里減去rects[0].top,是因?yàn)榈谝豁?xiàng)頂部可能不是貼到導(dǎo)航欄(比如有個(gè)搜索框的情況)
// this.arr.push(rect.top - rects[0].top);
this.arr.push(rect.top)
resolve();
})
}).exec()
})
},
}
監(jiān)聽(tīng)右側(cè)元素滾動(dòng)時(shí)交互的狀態(tài)
節(jié)點(diǎn)布局交叉狀態(tài) API 可用于監(jiān)聽(tīng)兩個(gè)或多個(gè)組件節(jié)點(diǎn)在布局位置上的相交狀態(tài)。這一組API常??梢杂糜谕茢嗄承┕?jié)點(diǎn)是否可以被用戶看見(jiàn)、有多大比例可以被用戶看見(jiàn)。這里也不再贅述,不懂的直接閱讀文檔 —— 《傳送地址》
methods: {
/**
* 觀測(cè)元素相交狀態(tài)
* 檢測(cè)右邊scroll-view的id為itemxx的元素與right-box的相交狀態(tài)
* 如果跟.right-box底部相交,就動(dòng)態(tài)設(shè)置左邊欄目的活動(dòng)狀態(tài)
*/
async observer() {
this.tabbar.map((val, index) => {
let observer = uni.createIntersectionObserver(this);
observer.relativeTo('.right-box', {
top: 0
}).observe('#item' + index, res => {
if (res.intersectionRatio > 0) {
let id = res.id.substring(4);
this.leftMenuStatus(id);
}
})
})
},
/**
* 設(shè)置左邊菜單的滾動(dòng)狀態(tài)
* @index 傳入的 ID
*/
async leftMenuStatus(index) {
this.current = index;
// 如果為0,意味著尚未初始化
if (this.menuHeight == 0 || this.menuItemHeight == 0) {
await this.getElRect('menu-scroll-view', 'menuHeight');
await this.getElRect('u-tab-item', 'menuItemHeight');
}
// 將菜單活動(dòng)item垂直居中
this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
}
}
實(shí)現(xiàn)左側(cè)菜單點(diǎn)擊聯(lián)動(dòng)右側(cè)滾動(dòng)
methods: {
/**
* 點(diǎn)擊左邊的欄目切換
* @index 傳入的 ID
*/
async swichMenu(index) {
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);
})
},
}
實(shí)現(xiàn)右側(cè)菜單滾動(dòng)聯(lián)動(dòng)左側(cè)高亮
methods: {
/**
* 右邊菜單滾動(dòng)
* 如果不存在height2,意味著數(shù)據(jù)循環(huán)已經(jīng)到了最后一個(gè),設(shè)置左邊菜單為最后一項(xiàng)即可
*/
async rightScroll(e) {
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');
}
setTimeout(() => { // 節(jié)流
this.timer = null;
// scrollHeight為右邊菜單垂直中點(diǎn)位置
// let scrollHeight = e.detail.scrollTop + this.menuHeight / 2;
// scrollHeight為右邊菜單頭部位置
let scrollHeight = e.detail.scrollTop + 20;
for (let i = 0; i < this.arr.length; i++) {
let height1 = this.arr[i];
let height2 = this.arr[i + 1];
if (!height2 || scrollHeight >= height1 && scrollHeight < height2) {
this.leftMenuStatus(i);
return ;
}
}
}, 10)
}
}
三、最后tabbar數(shù)據(jù)
[
{
"name":"蔬菜水果",
"foods":[
{
"cat":383,
"name":"蔬菜",
"icon":"http://nq348.com/uploads/category/20220315/1aeed6fa43b54cd68cce0c4883160f91.png",
"key":"蔬菜"
},
{
"cat":384,
"name":"食用菌",
"icon":"http://nq348.com/uploads/category/20220418/09839c618b35b510d50151f9a17793ee.png",
"key":"食用菌"
},
{
"cat":385,
"name":"水果",
"icon":"http://nq348.com/uploads/category/20220418/5294ad2fc7effc9629cbfdb8baf41773.png",
"key":"水果"
}
]
},
{
"name":"畜禽養(yǎng)殖",
"foods":[
{
"cat":388,
"name":"禽類",
"icon":"http://nq348.com/uploads/category/20220418/da31895fc5a9aacf93fea6f27f08afd7.png",
"key":"禽類"
},
{
"cat":389,
"name":"畜類",
"icon":"http://nq348.com/uploads/category/20220418/6352081e3f3b36f9360a933676e9452c.png",
"key":"畜類"
},
{
"cat":391,
"name":"蛋類",
"icon":"http://nq348.com/uploads/category/20220418/d2e7ab4224679c0c796ba3ddd8a68e2f.png",
"key":"蛋類"
},
{
"cat":390,
"name":"水產(chǎn)",
"icon":"http://nq348.com/uploads/category/20220418/52a1f1baa7617ef4d4e1a4b344b2fce7.png",
"key":"水產(chǎn)"
}
]
},
{
"name":"糧油副食",
"foods":[
{
"cat":393,
"name":"米面糧油",
"icon":"http://nq348.com/uploads/category/20220418/1bb32e319ecf5aa352b7fe26fc265004.png",
"key":"米面糧油"
},
{
"cat":394,
"name":"堅(jiān)果干果",
"icon":"http://nq348.com/uploads/category/20220418/6ded13eae4a3b113b5225ca8b99bbfdd.png",
"key":"堅(jiān)果干果"
},
{
"cat":395,
"name":"加工食品",
"icon":"http://nq348.com/uploads/category/20220418/1e1c10838799de5834aa77f0f9eb8f40.png",
"key":"加工食品"
},
{
"cat":396,
"name":"茶煙酒",
"icon":"http://nq348.com/uploads/category/20220418/c43cd994e49023c7efdf2b18b1bca30b.png",
"key":"茶煙酒"
}
]
},
{
"name":"花卉苗木",
"foods":[
{
"cat":398,
"name":"鮮花盆景",
"icon":"http://nq348.com/uploads/category/20220418/b21c44045daaa8b8d148981ba9efc2e0.png",
"key":"鮮花盆景"
},
{
"cat":399,
"name":"果樹苗",
"icon":"http://nq348.com/uploads/category/20220418/63ee2b902ff0f4d638d8a5ad770f7641.png",
"key":"果樹苗"
},
{
"cat":400,
"name":"蔬瓜種子",
"icon":"http://nq348.com/uploads/category/20220418/2df521877616ee44fd01aae0434a5815.png",
"key":"蔬瓜種子"
},
{
"cat":401,
"name":"經(jīng)濟(jì)作物",
"icon":"http://nq348.com/uploads/category/20220418/f85be72a98694befd889f30de45a1d64.png",
"key":"經(jīng)濟(jì)作物"
}
]
},
{
"name":"中草藥材",
"foods":[
{
"cat":403,
"name":"全草類",
"icon":"http://nq348.com/uploads/category/20220418/01812c1a83f5db7eafbf3bdae927f134.png",
"key":"全草類"
},
{
"cat":405,
"name":"根莖皮葉花",
"icon":"http://nq348.com/uploads/category/20220418/dca8dcc814401474d4f19ae7394cc209.png",
"key":"根莖皮葉花"
},
{
"cat":406,
"name":"滋補(bǔ)品類",
"icon":"http://nq348.com/uploads/category/20220418/33b965295811fdd6f5e672e9a3ce34a2.png",
"key":"滋補(bǔ)品類"
},
{
"cat":404,
"name":"果實(shí)籽仁類",
"icon":"http://nq348.com/uploads/category/20220418/1dc8c46c66b4625d458a7f45787ecef9.png",
"key":"果實(shí)籽仁類"
}
]
},
{
"name":"其他",
"foods":[
{
"cat":434,
"name":"包裝",
"icon":"http://nq348.com/uploads/category/20220418/ebdfd326333344825adbe81dbd89e2c9.png",
"key":"包裝"
},
{
"cat":435,
"name":"安全溯源",
"icon":"http://nq348.com/uploads/category/20220418/03230c63f066f46005abf5f576df0ed1.png",
"key":"安全溯源"
},
{
"cat":436,
"name":"農(nóng)用百貨",
"icon":"http://nq348.com/uploads/category/20220418/93393f2df3264faba86bb449a0c10a79.png",
"key":"農(nóng)用百貨"
},
{
"cat":437,
"name":"倉(cāng)儲(chǔ)物流",
"icon":"http://nq348.com/uploads/category/20220418/f553505ebabbcb1bf762b288716cf1e7.png",
"key":"倉(cāng)儲(chǔ)物流"
}
]
}
]
總結(jié)
到此這篇關(guān)于uniapp實(shí)現(xiàn)左右聯(lián)動(dòng)商品分類頁(yè)面的文章就介紹到這了,更多相關(guān)uniapp左右聯(lián)動(dòng)商品分類頁(yè)面內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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