自举 4 |表格
表单布局: Bootstrap 提供两种表单布局，如下所示:
- 堆叠形式
- 内嵌表单
堆叠表单:堆叠表单以堆叠格式创建输入字段和提交按钮。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Form</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
</head>
<body>
<h1 class="text-success text-center">
GeeksforGeeks
</h1>
<h2 class="text-center">Stacked form</h2>
<div class="container">
<form action="#">
<div class="form-group">
<label for="fname">First Name:</label>
<input type="text" class="form-control"
id="fname" placeholder="Enter First Name"
name="fname">
</div>
<div class="form-group">
<label for="lname">Last Name:</label>
<input type="text" class="form-control" id="lname"
placeholder="Enter Last Name" name="lname">
</div>
<div class="form-group">
<label for="email">Email Id:</label>
<input type="email" class="form-control" id="email"
placeholder="Enter Email Id" name="email">
</div>
<div class="form-group">
<label for="contact">Contact No:</label>
<input type="text" class="form-control" id="contact"
placeholder="Enter Contact Number" name="contact">
</div>
<div class="form-group form-check">
<label class="form-check-label">
<input class="form-check-input" type="checkbox"
name="remember"> Remember me
</label>
</div>
<button type="submit" class="btn bg-success">
Submit
</button>
</form>
</div>
</body>
</html>
输出:
直列形式:。表单-内联类与<表单>元素一起使用来创建内联表单。内联表单包含左对齐和内联的元素。当视口宽度至少为 576px 时，内联属性适用。如果屏幕尺寸小于 576px，则表单元素将垂直堆叠。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Form</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
</head>
<body>
<h1 class="text-success text-center">
GeeksforGeeks
</h1>
<h2 class="text-center">Inline form</h2>
<div class="container">
<form class="form-inline" action="#">
<label for="fname">First Name:</label>
<input type="text" class="form-control"
id="fname" placeholder="Enter First Name"
name="fname">
<label for="lname">Last Name:</label>
<input type="text" class="form-control"
id="lname" placeholder="Enter Last Name"
name="lname">
<label for="email">Email Id:</label>
<input type="email" class="form-control"
id="email" placeholder="Enter Email Id"
name="email">
<label for="contact">Contact No:</label>
<input type="text" class="form-control"
id="contact"
placeholder="Enter Contact Number"
name="contact">
<div class="form-group form-check">
<label class="form-check-label">
<input class="form-check-input"
type="checkbox"
name="remember"> Remember me
</label>
</div>
<button type="submit"
class="btn bg-success">
Submit
</button>
</form>
</div>
</body>
</html>
输出:
带实用程序的内嵌表单:引导间距实用程序用于添加空间，以使内嵌表单看起来更好。。mr-sm-2 类用于在所有设备(小型及以上)和上为每个输入添加右边距。mb-2 类在底部增加了一个边距。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Form</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
</head>
<body>
<h1 class="text-success text-center">
GeeksforGeeks
</h1>
<h2 class="text-center">Inline form with Utilities</h2>
<div class="container-fluit">
<form class="form-inline" action="#">
<label for="fname" class="mb-2 mr-sm-2">
First Name:
</label>
<input type="text" class="form-control mb-2 mr-sm-2"
id="fname" placeholder="Enter First Name"
name="fname">
<label for="lname" class="mb-2 mr-sm-2">
Last Name:
</label>
<input type="text" class="form-control mb-2 mr-sm-2"
id="lname" placeholder="Enter Last Name"
name="lname">
<label for="email" class="mb-2 mr-sm-2">
Email Id:
</label>
<input type="email" class="form-control mb-2 mr-sm-2"
id="email" placeholder="Enter Email Id"
name="email">
<label for="contact" class="mb-2 mr-sm-2">
Contact No:
</label>
<input type="text" class="form-control mb-2 mr-sm-2"
id="contact" placeholder="Enter Contact Number"
name="contact">
<div class="form-check mb-2 mr-sm-2">
<label class="form-check-label">
<input class="form-check-input"
type="checkbox"
name="remember"> Remember me
</label>
</div>
<button type="submit" class="btn bg-success mb-2">
Submit
</button>
</form>
</div>
</body>
</html>
输出:
表单验证:。已经过验证的或。需求-验证<表单>元素中的类用于在提交表单之前或之后提供验证。带有绿色边框的输入字段表示有效，红色边框表示无效的表单内容。。有效反馈或。无效反馈用于在提交表单前向用户显示通知消息。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Form</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
</head>
<body>
<h1 class="text-success text-center">GeeksforGeeks</h1>
<h2 class="text-center">Form Validation</h2>
<div class="container">
<form action="#" class="was-validated">
<div class="form-group">
<label for="fname">First Name:</label>
<input type="text" class="form-control" id="fname"
placeholder="Enter First Name" name="fname" required>
<div class="valid-feedback">Valid</div>
<div class="invalid-feedback">
Please fill this field
</div>
</div>
<div class="form-group">
<label for="lname">Last Name:</label>
<input type="text" class="form-control" id="lname"
placeholder="Enter Last Name" name="lname" required>
<div class="valid-feedback">Valid</div>
<div class="invalid-feedback">
Please fill this field
</div>
</div>
<div class="form-group">
<label for="email">Email Id:</label>
<input type="email" class="form-control" id="email"
placeholder="Enter Email Id" name="email" required>
<div class="valid-feedback">Valid</div>
<div class="invalid-feedback">
Please fill this field
</div>
</div>
<div class="form-group">
<label for="contact">Contact No:</label>
<input type="text" class="form-control" id="contact"
placeholder="Enter Contact Number" name="contact"
required>
<div class="valid-feedback">Valid</div>
<div class="invalid-feedback">
Please fill this field
</div>
</div>
<div class="form-group form-check">
<label class="form-check-label">
<input class="form-check-input" type="checkbox"
name="remember" required> I agree
<div class="valid-feedback">Valid</div>
<div class="invalid-feedback">
Please check the checkbox
</div>
</label>
</div>
<button type="submit" class="btn bg-success">Submit</button>
</form>
</div>
</body>
</html>
输出:
支持的浏览器:
- 谷歌 Chrome
- 微软公司出品的 web 浏览器
- 火狐浏览器
- 歌剧
- 旅行队
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