首页 > 编程语言 > Vue列表如何实现滚动到指定位置样式改变效果
2020
09-28

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" :id="index"
       :key="index"
       :class="{ active: currentSession?item.username === currentSession.username:false}"
       @click="changeCurrentSession(item)">
       <img class="avatar"
         :src="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="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="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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