Vue列表如何实现滚动到指定位置样式改变效果

前端  /  管理员 发布于 5年前   611

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" :id="index"       :key="index"       :class="{ active: currentSession?item.username === currentSession.username:false}"       @click="changeCurrentSession(item)">       <img class="avatar"         :src="https://www.jb51.net//article/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" class="input-with-select" popper-append-to-body="false"       style="width: 90%;padding-left: 5%;padding-top: 10px;margin-bottom: 10px"       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      class="el-menu-vertical-demo"      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 class="avatar"        :src="https://www.jb51.net//article/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" class="input-with-select" popper-append-to-body="false"       style="width: 90%;padding-left: 5%;padding-top: 10px;margin-bottom: 10px"       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" :id="index"       :key="index"       :class="{ active: currentSession?item.username === currentSession.username:false}"       @click="changeCurrentSession(item)">       <img class="avatar"         :src="https://www.jb51.net//article/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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