使用Vant框架list组件的坑
木末回春风 人气:6使用Vant框架list组件的坑
介绍
Vant 是有赞前端团队开源的移动端组件库,于 2017 年开源,已持续维护 4 年时间。
Vant 对内承载了有赞所有核心业务,对外服务十多万开发者,是业界主流的移动端组件库之一。
特性
- 提供 60 多个高质量组件,覆盖移动端各类场景
- 性能极佳,组件平均体积不到 1kb(min+gzip)
- 单元测试覆盖率 90%+,提供稳定性保障
- 完善的中英文文档和示例
- 支持 Vue 2 & Vue 3
- 支持按需引入
- 支持主题定制
- 支持国际化
- 支持 TypeScript
- 支持 SSR
快速配置和具体介绍请去官方文档,Vant框架在Github上点赞众多,用起来发现还是很好用的,强力推荐
聊一下使用list组件遇到的坑
官方文档的实例代码是这样的:
<van-list v-model="loading" :finished="finished" finished-text="没有更多了" @load="onLoad" > <van-cell v-for="item in list" :key="item" :title="item" /> </van-list> export default { data() { return { list: [], loading: false, finished: false, }; }, methods: { onLoad() { // 异步更新数据 // setTimeout 仅做示例,真实场景中一般为 ajax 请求 setTimeout(() => { for (let i = 0; i < 10; i++) { this.list.push(this.list.length + 1); } // 加载状态结束 this.loading = false; // 数据全部加载完成 if (this.list.length >= 40) { this.finished = true; } }, 1000); }, }, };
效果图片:
可是!你复制代码,发现,发现完全不好用!这个定时任务简直看不懂,触底加载简直毫无逻辑,通过几个小时的研究,发现问题所在居然是CSS!对,你没有听错!是CSS导致的!
下方代码,重点看css部分,JS部分,记住settimeout不要去掉,不要相信他的注释,业务写在settimeout里就可以了
解释一下这个css的含义,就是van-list需要给他定义一个高度,并且滚动自适应,这样在不填满高度或者是滚动触底的时候就可以完美的触发onLoad时间了,这里还有一个重点!就是van-list的父级也要定义一下高度,不然也是不行的!
至于业务一定要在settimeout中写业务才能有效,了解的大佬看到了帮忙解释一下,不是很明白
<div class="txtc" style="height: 100%; position: fixed; width: 100%"> <van-list style="height:100%;width:100%;overflow-y:auto;" v-model="loading" :finished="finished" finished-text="没有更多了" @load="onLoad" > <div class="divinfo" v-for="item in tableData" :key="item.sid"></div> </van-list> </div>
vant中van-list的使用
van-list里面的元素不能有float样式,否则会连续触发 load 事件
原代码
<template> <div class="about"> <van-tabs v-model="active" sticky @change="getTypeDate"> <van-tab v-for="(tab) in typeList" :title="tab.name" :key="tab.id"> <div :style="{height: contentHeight}" class="pic-content"> <van-list :finished="finished" :finished-text="finishedText" v-model="loading" :offset="10" :immediate-check="false" @load="getserviceList" > <!------------------------------------------------- 修改前代码 ---------------------------------------------> /*<div class="pic-box" v-for="(serve) in serviceList" :key="serve.id" @click="router(serve)" > <div class="pic-item"> <img v-if="serve.picturePath" :src="$BASE_PICTUREPATH_URL + serve.picturePath.split(',')[0]" > </div> <p>{{serve.name}}</p> <p class="price-red">¥{{serve.price}}</p> </div>*/ <!------------------------------------------------- 修改前代码 ---------------------------------------------> </van-list> </div> </van-tab> </van-tabs> </div> </template>
<script> import { Tab, Tabs, List, Cell, Row, Col } from "vant"; import { FetchServeType, FetchServeList } from "../apis/serve.js"; export default { data() { return { active: 0, typeList: [], serviceList: [], type: "", finishedText: "", finished: false, pageNum: 1, pageSize: 10, contentHeight: 0, loading: false }; }, mounted() { this.getOrderStyle(); this.contentHeight = document.documentElement.clientHeight - 66 - 40 + "px"; }, methods: { async getOrderStyle() { let res = await FetchServeType(); if (res.data && res.data.success) { this.typeList = res.data.data; this.type = res.data.data[0].name; this.getTypeDate(); } }, getTypeDate() { this.pageNum = 1; this.type = this.typeList[this.active].name; this.serviceList = []; this.finishedText = ""; this.finished = false; this.getserviceList(); }, async getserviceList() { let toast = this.$toast.loading({ mask: true, message: "加载中..." }); const { type, pageNum, pageSize } = this; let params = { type, pageNum, pageSize }; let res = await FetchServeList(params); this.loading = false; toast.close(); if (res.data && res.data.success) { let list = (res.data.data && res.data.data.list) || []; if (pageNum > 1) { this.serviceList = [...this.serviceList, ...list]; } else { this.serviceList = list; } // 如果当前页数 = 总页数,则已经没有数据 if (res.data.data.pageNum === res.data.data.pages) { this.finished = true; this.finishedText = "- 没有更多了-"; } // 如果总页数大于当前页码,页码+1 if (res.data.data.pages > pageNum) { this.pageNum++; } } console.log("FetchServeList: ", this.serviceList); } } }; </script>
<style lang="scss" scoped> .pic-content { overflow-y: scroll; -webkit-overflow-scrolling: touch; .pic-box { /****************************修改前代码***************************/ background-color: #fff; overflow: hidden; break-inside: avoid; box-sizing: border-box; margin-bottom: 0.7rem; padding: 0.8rem; width: 48%; height: 16rem; ~~float: left;~~ /**************不能有float样式*************/ margin: 1%; border-radius: 4px; /****************************修改前代码***************************/ p:nth-of-type(1) { padding: 0.8rem 0; } p:nth-of-type(2) { color: red; } .pic-item { height: 11rem; flex-direction: column; justify-content: center; overflow: hidden; img { width: 100%; height: auto; border-radius: 4px; } } } } </style>
// 修改后代码(注释部分为修改后代码)
<template> <div class="about"> <van-tabs v-model="active" sticky @change="getTypeDate"> <van-tab v-for="(tab) in typeList" :title="tab.name" :key="tab.id"> <div :style="{height: contentHeight}" class="pic-content"> <van-list :finished="finished" :finished-text="finishedText" v-model="loading" :offset="10" :immediate-check="false" @load="getserviceList" > <!------------------------------------------------- 修改后代码 ---------------------------------------------> /*<van-row> <van-col span="12" class="pic-box" v-for="(serve) in serviceList" :key="serve.id" @click="router(serve)" > <div class="pic-item"> <img v-if="serve.picturePath" :src="$BASE_PICTUREPATH_URL + serve.picturePath.split(',')[0]" > </div> <p>{{serve.name}}</p> <p class="price-red">¥{{serve.price}}</p> </van-col> </van-row>*/ <!------------------------------------------------- 修改后代码 ---------------------------------------------> </van-list> </div> </van-tab> </van-tabs> </div> </template>
<script> import { Tab, Tabs, List, Cell, Row, Col } from "vant"; import { FetchServeType, FetchServeList } from "../apis/serve.js"; export default { data() { return { active: 0, typeList: [], serviceList: [], type: "", finishedText: "", finished: false, pageNum: 1, pageSize: 10, contentHeight: 0, loading: false }; }, mounted() { this.getOrderStyle(); this.contentHeight = document.documentElement.clientHeight - 66 - 40 + "px"; }, methods: { async getOrderStyle() { let res = await FetchServeType(); if (res.data && res.data.success) { this.typeList = res.data.data; this.type = res.data.data[0].name; this.getTypeDate(); } }, getTypeDate() { this.pageNum = 1; this.type = this.typeList[this.active].name; this.serviceList = []; this.finishedText = ""; this.finished = false; this.getserviceList(); }, async getserviceList() { let toast = this.$toast.loading({ mask: true, message: "加载中..." }); const { type, pageNum, pageSize } = this; let params = { type, pageNum, pageSize }; let res = await FetchServeList(params); this.loading = false; toast.close(); if (res.data && res.data.success) { let list = (res.data.data && res.data.data.list) || []; if (pageNum > 1) { this.serviceList = [...this.serviceList, ...list]; } else { this.serviceList = list; } // 如果当前页数 = 总页数,则已经没有数据 if (res.data.data.pageNum === res.data.data.pages) { this.finished = true; this.finishedText = "- 没有更多了-"; } // 如果总页数大于当前页码,页码+1 if (res.data.data.pages > pageNum) { this.pageNum++; } } console.log("FetchServeList: ", this.serviceList); } } }; </script>
<style lang="scss" scoped> .pic-content { overflow-y: scroll; -webkit-overflow-scrolling: touch; .pic-box { /************************ 修改后代码**************************/ background-color: #fff; overflow: hidden; box-sizing: border-box; margin-bottom: 0.7rem; padding: 0.8rem; height: 16rem; border-radius: 4px; /************************ 修改后代码************************ **/ p:nth-of-type(1) { padding: 0.8rem 0; } p:nth-of-type(2) { color: red; } .pic-item { height: 11rem; flex-direction: column; justify-content: center; overflow: hidden; img { width: 100%; height: auto; border-radius: 4px; } } } } </style>
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。
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