如何防止子 div 在更改 CSS 缩放属性时溢出父 div？

Question

我知道我们可以使用 CSS overflow 属性.

来防止儿童内容溢出

但是 overflow: scroll 属性不能防止溢出。

let zoomInElem = document.getElementById('zoomIn')
let zoomOutElem = document.getElementById('zoomOut')
let contentElement = document.getElementById('content')
zoomInElem.addEventListener('click', function () {
    console.log('zoomIn')
    contentElement.style.zoom = '200%'
})
zoomOutElem.addEventListener('click', function () {
    console.log('zoomOut')
    contentElement.style.zoom = '100%'
})

#main {
    width: 640px;
    height: 360px;
    border: solid;
}

#content {
    border: .1rem solid red;
    overflow: scroll;
}

button {
    margin: 1rem;
}

<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap demo</title>
    <style>

    </style>
</head>

<body>
    <div>
        <button id="zoomIn">ZoomIn</button>
        <button id="zoomOut">ZoomOut</button>
    </div>
    <div id="main">
        <div id="content">
            <h1>Hi</h1>
            <h2>Hi</h2>
            <h3>Hi</h3>
            <h4>Hi</h4>
        </div>
    </div>

    <script>

    </script>
</body>

</html>

如何防止通过单击 ZoomIn 按钮更改 CSS zoom 属性时溢出？

Answer 1

您可以定义#content的width和height，或者将#main的overflow设置为scroll。

<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap demo</title>
    <style>
        #main {
            width: 640px;
            height: 360px;
            border: solid;
            overflow: scroll; 
        }

        #content {
            /*width: 100%; 
            height: 100%; */
            border: .1rem solid red;
            /* overflow: scroll; */
        }

        button {
            margin: 1rem;
        }
    </style>
</head>

<body>
    <div>
        <button id="zoomIn">ZoomIn</button>
        <button id="zoomOut">ZoomOut</button>
    </div>
    <div id="main">
        <div id="content">
            <h1>Hi</h1>
            <h2>Hi</h2>
            <h3>Hi</h3>
            <h4>Hi</h4>
        </div>
    </div>

    <script>
        let zoomInElem = document.getElementById('zoomIn')
        let zoomOutElem = document.getElementById('zoomOut')
        let contentElement = document.getElementById('content')
        zoomInElem.addEventListener('click', function () {
            contentElement.style.zoom = '200%'
        })
        zoomOutElem.addEventListener('click', function () {
            contentElement.style.zoom = '100%'
        })
    </script>
</body>

</html>

Answer 2

尝试设置溢出：滚动；在外部 div

#main {  position: relative;overflow: scroll;}

如何防止子 div 在更改 CSS 缩放属性时溢出父 div？

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如何防止子 div 在更改 CSS 缩放 属性 时溢出父 div？

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如何防止子 div 在更改 CSS 缩放属性时溢出父 div？