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這篇文章主要介紹在html5中如何設置直播間評論滾動,文中介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們一定要看完!
直播間評論滾動效果,下劃查看歷史消息并停止滾動,如有新消息會出現新消息提醒,點擊滾動到底部。
2.具體代碼
<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}}條新消息</div> </div></template>
<script>
import smoothscroll from 'smoothscroll-polyfill';
import { debounce, isScrollBottom } from '../utils/utils';
smoothscroll.polyfill(); // 移動端scrollTo behavior: "smooth"動畫失效的polyfillexport 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);
});
}, // 隊列添加消息
async queue(data) { for (let i = 0; i < data.length; i++) { const opt = {
name: i + "-用戶名",
content: i + "-評論內容",
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;
}
}, // 添加評論 如果超過150條就將前50條刪除addComment(data) {if (this.list.length >= 150) {this.list.splice(0, 50);
}this.list.push(data);this.$nextTick(() => { this.renderComment();
});
}, // 渲染評論renderComment() {const listHight = this.listDom.offsetHeight;const diff = listHight - this.wrapperHeight; // 列表高度與容器高度差值const top = this.wrapperDom.scrollTop; // 列表滾動高度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;
}, // 滾動到底部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>
用的的兩個工具函數:
/**
* @desc 函數防抖
* @param {需要防抖的函數} func
* @param {延遲時間} wait
*/export function debounce(func, wait = 500) {// 緩存一個定時器idlet timer = 0;// 這里返回的函數是每次用戶實際調用的防抖函數// 如果已經設定過定時器了就清空上一次的定時器// 開始一個新的定時器,延遲執行用戶傳入的方法return function (...args) {if (timer) clearTimeout(timer)
timer = setTimeout(() => {
func.apply(this, args)
}, wait)
}
}/**
* @desc 是否滾到到容器底部
* @param {滾動容器} ele
* @param {容器高度} wrapHeight
*/export function isScrollBottom(ele, wrapHeight, threshold = 30) {const h2 = ele.scrollHeight - ele.scrollTop;const h3 = wrapHeight + threshold;const isBottom = h2 <= h3;return isBottom;
}
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