监听div滚动高度_代码007(未授权)

本文介绍: 前端开发经常会遇到监听滚动事件的情况，检测到页面滚动距离做一些操作。有时候也会监听一些容器的滚动如：div，与前者有一些差别，本文会先后介绍这两种情况如何实现。

&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>window滚动事件</title>
</head>
<body style="height: 2000px;">

<button onclick="scrollWindow()" style="position: fixed; bottom: 0px;">返回顶部</button>

<script>
// 想在页面滚动的时候获取相关信息，试试下面的操作
window.onscroll = () => {
    console.log('document.documentElement.scrollTop:', document.documentElement.scrollTop)
    // todo 处理具体的页面逻辑
}

function scrollWindow() {
    document.documentElement.scrollTop = 0
}
</script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #box {
            height: 200px;
            width: 300px;
            overflow: scroll;
            width: 300px;
            background-color: aliceblue;
        }

        .content {
            width: 100%;
            height: 400px;
            background-color: antiquewhite;
        }
    </style>
</head>
<body>
    <div id="box">
        <div class="content">
          比父级高的容器
        </div>
    </div>
    <div>
        <textarea id="text"></textarea>
    </div>
    <button onclick="append()">send</button>
    <button onclick="toTop()">toTop</button>
    <script>
        var element = document.getElementById('box');

        element.addEventListener('scroll', function(e) {
            console.log('e.target.scrollTop:', e.target.scrollTop)
        })

        function toTop() {
            element.scrollTop = 0
        }

        function append() {
            let p = document.createElement("p");
            let val = document.getElementById('text').value
            var textnode=document.createTextNode(val);
            p.appendChild(textnode);
            element.appendChild(p)
            document.getElementById('text').value = ''
            // 滚动到底部
            element.scrollTop = element.scrollHeight;
        }
        
    </script>
</body>
</html>