直播间评论滚动效果，下划查看历史消息并停止滚动，如有新消息会出现新消息提醒，点击滚动到底部。
2.具体代码
我要评论
<template>
<div class="comment">
<div class="comment-wrap" ref="wrapper">
<ul class="list" ref="list">
<li v-for="item in list" :key="item.id">
<span class="name">{{item.name}}：</span>
<span class="content">{{item.content}}</span>
</li>
</ul>
</div>
<div class="rest-nums" v-show="restcomment" @click="scrollbottom">{{restcomment}}条新消息</div>
</div>
</template>
<script>
import smoothscroll from 'smoothscroll-polyfill';
import { debounce, isscrollbottom } from '../utils/utils';
smoothscroll.polyfill(); // 移动端scrollto behavior: "smooth"动画失效的polyfill
export default {
data() {
return {
list: [],
restcomment: 0,
restnums: 0,
wrapperdom: null,
listdom: null,
wrapperheight: 0
};
},
mounted() {
this.initdom();
// ajax...
const data = new array(20).fill('');
this.queue(data);
settimeout(() => {
const list = new array(10).fill('');
this.queue(list);
}, 30000);
},
methods: {
initdom() {
this.wrapperdom = this.$refs.wrapper;
this.listdom = this.$refs.list;
this.wrapperheight = this.wrapperdom.offsetheight;
},
addtimeout(opt) {
return new promise((resolve, reject) => {
settimeout(() => {
this.addcomment(opt);
resolve()
}, 500);
});
},
// 队列添加消息
async queue(data) {
for (let i = 0; i < data.length; i++) {
const opt = {
name: i + "-用户名",
content: i + "-评论内容",
id: date.now()
}
await this.addtimeout(opt);
}
},
addscroll() {
debounce(this.listscroll, 200);
this.isbindscrolled = true;
},
listscroll() {
const ele = this.wrapperdom;
const isbottom = isscrollbottom(ele, ele.clientheight);
if (isbottom) {
this.restnums = 0;
this.restcomment = 0;
}
},
// 添加评论 如果超过150条就将前50条删除
addcomment(data) {
if (this.list.length >= 150) {
this.list.splice(0, 50);
}
this.list.push(data);
this.$nexttick(() => {
this.rendercomment();
});
},
// 渲染评论
rendercomment() {
const listhight = this.listdom.offsetheight;
const diff = listhight - this.wrapperheight; // 列表高度与容器高度差值
const top = this.wrapperdom.scrolltop; // 列表滚动高度
if (diff - top < 50) {
if (diff > 0) {
if (this.isbindscrolled) {
this.isbindscrolled = false;
this.wrapperdom.removeeventlistener("scroll", this.addscroll);
}
this.wrapperdom.scrollto({
top: diff + 10,
left: 0,
behavior: "smooth"
});
this.restnums = 0;
}
} else {
++this.restnums;
if (!this.isbindscrolled) {
this.isbindscrolled = true;
this.wrapperdom.addeventlistener("scroll", this.addscroll);
}
}
this.restcomment = this.restnums >= 99 ? "99+" : this.restnums;
},
// 滚动到底部
scrollbottom() {
this.restnums = 0; // 清除剩余消息
this.restcomment = this.restnums;
this.wrapperdom.scrollto({
top: this.listdom.offsetheight,
left: 0,
behavior: "smooth"
});
}
}
};
</script>
<style scoped>
*{
padding: 0;
margin: 0;
}
.comment{
width: 70%;
height: 350px;
position: relative;
margin: 100px 0 0 20px;
}
.comment-wrap{
height: 350px;
overflow-y: scroll;
-webkit-overflow-scrolling:touch;
}
.comment-wrap li{
text-align: left;
line-height: 30px;
padding-left: 10px;
background: rgba(0, 0, 0, 0.3);
margin-top: 5px;
border-radius: 15px;
color: #fff;
}
.rest-nums{
position: absolute;
height: 24px;
line-height: 24px;
color: #f00;
border-radius: 15px;
padding: 0 15px;
bottom: 10px;
background: #fff;
font-size: 14px;
left: 10px;
}
</style>
用的的两个工具函数
/**
* @desc 函数防抖
* @param {需要防抖的函数} func
* @param {延迟时间} wait
*/
export function debounce(func, wait = 500) {
// 缓存一个定时器id
let timer = 0;
// 这里返回的函数是每次用户实际调用的防抖函数
// 如果已经设定过定时器了就清空上一次的定时器
// 开始一个新的定时器，延迟执行用户传入的方法
return function (...args) {
if (timer) cleartimeout(timer)
timer = settimeout(() => {
func.apply(this, args)
}, wait)
}
}
/**
* @desc 是否滚到到容器底部
* @param {滚动容器} ele
* @param {容器高度} wrapheight
*/
export function isscrollbottom(ele, wrapheight, threshold = 30) {
const h1 = ele.scrollheight - ele.scrolltop;
const h2 = wrapheight + threshold;
const isbottom = h1 <= h2;
return isbottom;
}
总结
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