Vue列表如何实现滚动到指定位置样式改变效果

这个需求大概是这样子：

我做的一个聊天Demo，在搜索框搜索用户，可以滚动到指定的用户。然后成选中状态。

这是目前状态，我搜索南宫仆射 ，想要下面的用户列表直接滚动到南宫仆射并改变CSS样式。

查询之后是这个子：

嗯，我的思路：

在搜索框搜索到用户之后会返回一个用户对象，之后会调用列表的点击事件，改变CSS样式及做一些聊天的逻辑。然后需要获取到列表对应的id值，直接使用 document.getElementById(it).scrollIntoView();

具体实现：

列表：使用vue的v-for指令 ，这里的id值使用的是遍历的索引值，外层是一个自定义滚动条组件。样式也是使用vue指令，一个语法糖。

<GeminiScrollbar class='my-scroll-bars'> <li v-for='(item,index) in hrs' ::key='index' :@click='changeCurrentSession(item)'> <img :src='https://www.haobala.com/bcjs/item.userface'> <el-badge :is-dot='isDot[user.username+’#’+item.username]'><p class='name'>{{item.name}}</p> </el-badge> </li> </GeminiScrollbar>

搜索框：这里使用带提示的输入框，

<el-autocomplete v-model='SearchHr' popper-append-to-body='false' size='small' :fetch-suggestions='querySearch' placeholder='请输入内容' @select='handleSelect' > <el-button slot='append' icon='el-icon-search' @click='SearchCurrentSession(SearchHr)'></el-button> </el-autocomplete>

JS代码：请求为get请求的axios封装，hr为查询返回的对象，hrs为所有的列表对象。

SearchCurrentSession() { this.getRequest('/chat/?name=' + this.SearchHr).then(resp => { if (resp) { this.hr = resp; this.SearchHr = ’’; this.changeCurrentSession(this.hr); let it = 0; this.hrs.forEach((item, index) => { if (item.name == this.hr.name) {it = index; } }) document.getElementById(it).scrollIntoView(); // document.getElementsByClassName('active')[0].scrollIntoView(); } });

changeCurrentSession(currentSession) { this.$store.commit(’changeCurrentSession’, currentSession) },

页面全部代码：

<template> <div style='display: flex;justify-content:space-between;height: 100%;width: 100%'> <div class='leftlist'> <el-menu background-color='#2e3238' router active-text-color='#67C23A' text-color='#fff' :collapse='isCollapse'> <el-menu-item index='/chat' style='padding-left: 10px;margin:10px 0px 20px 2px'> <el-tooltip effect='light' placement='right-start' popper-class='el-scrollbar'> <div slot='content'> <div style='margin-top: 5px;font-size: 13px;lineHeight:1.5;'><div>用户名：{{user.name}}</div><div>手机号码：{{user.phone}}</div><div>电话号码：{{user.telephone}}</div><div>地 址：{{user.address}}</div><div>备注：{{user.remark}}</div> </div> </div> <img :src='https://www.haobala.com/bcjs/user.userface':alt='user.name'></el-tooltip> </el-menu-item> <el-menu-item index='/chat' style='padding-left: 15px'> <i class='fa fa-weixin fa-2x'></i> </el-menu-item> <el-menu-item index='/chat' style='padding-left: 15px'> <i class='fa fa-windows fa-2x'></i> </el-menu-item> <el-menu-item index='/chat' style='padding-left: 15px'> <i class='fa fa-modx fa-2x'></i> </el-menu-item> <el-menu-item index='/chat' style='padding-left: 15px'> <i class='fa fa-share-alt fa-2x'></i> </el-menu-item> </el-menu> </div> <div id='list'> <div style='height:100%;width:100%;overflow-x: hidden'> <ul style='padding-left: 0px; overflow-x: hidden;'> <el-autocomplete v-model='SearchHr' popper-append-to-body='false' size='small' :fetch-suggestions='querySearch' placeholder='请输入内容' @select='handleSelect' > <el-button slot='append' icon='el-icon-search' @click='SearchCurrentSession(SearchHr)'></el-button> </el-autocomplete> <GeminiScrollbar class='my-scroll-bars'> <li v-for='(item,index) in hrs' ::key='index' :@click='changeCurrentSession(item)'> <img :src='https://www.haobala.com/bcjs/item.userface'> <el-badge :is-dot='isDot[user.username+’#’+item.username]'><p class='name'>{{item.name}}</p> </el-badge> </li> </GeminiScrollbar> </ul> </div> </div> </div></template><script> import {mapState} from ’vuex’ export default { name: ’list’, data() { return { isCollapse: true, SearchHr: ’’, hr: '', restaurants: [], user: JSON.parse(window.sessionStorage.getItem('user')) } }, computed: { ...mapState([ ’hrs’, ’isDot’, ’currentSession’ ]) }, methods: { SearchCurrentSession() { this.getRequest('/chat/?name=' + this.SearchHr).then(resp => { if (resp) { this.hr = resp; this.SearchHr = ’’; this.changeCurrentSession(this.hr); let it = 0; this.hrs.forEach((item, index) => { if (item.name == this.hr.name) {it = index; } }) document.getElementById(it).scrollIntoView(); // document.getElementsByClassName('active')[0].scrollIntoView(); } }); }, querySearch(queryString, cb) { this.restaurants = this.loadAll(); let restaurants = []; this.restaurants.forEach(value => { let {name, username} = value; let restaurant = {value: name, username: username} restaurants.push(restaurant); }); var results = queryString ? restaurants.filter(this.createFilter(queryString)) : restaurants; // 调用 callback 返回建议列表的数据 cb(results); }, createFilter(queryString) { return (SearchHr) => { return (SearchHr.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0); }; }, loadAll() { return this.hrs; }, changeCurrentSession(currentSession) { this.$store.commit(’changeCurrentSession’, currentSession) }, handleSelect(item) { console.log(item); } }, mounted() { this.$store.dispatch(’initData’); } }</script><style lang='scss' scoped> .my-scroll-bars { height: 610px; } /* override gemini-scrollbar default styles */ /* vertical scrollbar track */ .gm-scrollbar.-vertical { background-color: #f0f0f0 } /* horizontal scrollbar track */ .gm-scrollbar.-horizontal { background-color: transparent; } /* scrollbar thumb */ .gm-scrollbar .thumb { background-color: rebeccapurple; } .gm-scroll-view { overflow-x: hidden; } .gm-scrollbar .thumb:hover { background-color: fuchsia; } input-with-select { margin-top: 50px; padding-top: 20px; } .el-scrollbar__wrap { width: 100%; height: 100%; overflow-x: hidden; } .el-menu-item is-active { padding-left: 10px; } .el-menu-vertical-demo { background-color: #2e3238; width: 80px; height: 100%; /*opacity:0.8;*/ } .leftlist { background-color: transparent; width: 90px; height: 700px; overflow-x: hidden; } .avatar { width: 45px; height: 45px; /*这个是图片和文字居中对齐*/ border-radius: 5px; margin-top: 5px; } .el-scrollbar__wrap { background-color: #E4E7ED; } #el-scrollbar { background-color: #E4E7ED; } #list { background-color: #E4E7ED; width: 100%; overflow-x: hidden; li { padding: 7px 15px; border-bottom: 1px solid #E4E7ED; cursor: pointer; list-style: none; color: #505458; &:hover { background-color: rgba(0, 0, 0, 0.07); } } li.active { /*注意这个是.不是冒号:*/ background-color: rgba(0, 0, 0, 0.1); } .avatar { border-radius: 2px; width: 30px; height: 30px; vertical-align: middle; } .name { display: inline-block; margin-left: 15px; margin-top: 0px; margin-bottom: 0px; } }</style>

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