Vue列表如何实现滚动到指定位置样式改变效果
时间：2021-02-15 10:20:40 | 栏目：vue | 点击：次
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>
总结