Bootstrap4-sizing
提供：Dev Guides
ブートストラップ4-サイジング
説明
widthおよびheightユーティリティを使用して、要素のサイズを幅または高さにできます。
幅と高さのユーティリティ
幅と高さは、25％、50％、75％、100％、および自動の値を使用して、要素に設定できます。 たとえば、幅ユーティリティにはw-25（残りの値については25をそれらの値に置き換えます）、高さユーティリティにはh-25（残りの値に対しては25をそれらの値に置き換えます）を使用します。
次の例は、要素の幅と高さのユーティリティの設定を示しています-
例
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Width</h2>
<div class = "w-auto p-3" style = "background-color: #aaa;">
Width : auto
</div>
<br>
<div class = "w-100 p-3" style = "background-color: #aaa;">
Width : 100%
</div>
<br>
<div class = "w-75 p-3" style = "background-color: #aaa;">
Width : 75%
</div>
<br>
<div class = "w-50 p-3" style = "background-color: #aaa;">
Width : 50%
</div>
<br>
<div class = "w-25 p-3" style = "background-color: #aaa;">
Width : 25%
</div>
<br>
<h2>Height</h2>
<div class = "bg-secondary" style = "height: 100px; ">
<div class = "h-100 d-inline-block bg-info" style = "width: 120px;">
Height : 100%
</div>
<div class = "h-75 d-inline-block bg-info" style = "width: 120px;">
Height : 75%
</div>
<div class = "h-50 d-inline-block bg-info" style = "width: 120px; ">
Height : 50%
</div>
<div class = "h-25 d-inline-block bg-info" style = "width: 120px;">
Height : 25%
</div>
<div class = "h-auto d-inline-block bg-info" style = "width: 120px;">
Height : auto
</div>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<script src =" https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity =" sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin = "anonymous">
</script>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>それは次の結果を生成します-
出力
最大幅および最大高さユーティリティ
また、次の例に示すように、_mw-100_および_mh-100_ユーティリティを使用して、要素に最大の幅と高さを設定することもできます-
例
<html lang = "en">
<head>
<!-- Meta tags -->
<meta charset = "utf-8">
<meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
<!-- Bootstrap CSS -->
<link rel = "stylesheet"
href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Max Width</h2>
<img class = "mw-100"
src = "https://www.q1ins.com/wp-content/uploads/2016/09/black-transparent-box.png"
alt = "Max-width 100%">
<br>
<br>
<h2>Max Height</h2>
<div class = "bg-secondary" style = "height: 100px;">
<div class = "mh-100 bg-info" style = "width: 100px; height: 200px;">
Max-height : 100%
</div>
</div>
</div>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity = "sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin = "anonymous">
</script>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>それは次の結果を生成します-
