Bootstrap5 表单验证

2023-07-12 16:12 更新

我们可以使用不同的验证类来设置表单的验证功能。

.was-validated 或 .needs-validation 添加到 <form> 元素中,input 输入字段将具有绿色(有效)或红色(无效)边框效果,用于说明表单是否需要输入内容。

.valid-feedback 或 .invalid-feedback 类用来告诉用户缺少什么信息,或者在提交表单之前需要完成什么。

实例

使用 .was-validated 类显示表单在提交之前需要填写的内容:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>


<div class="container">
  <h2>表单验证</h2>
  <p>使用 .was-validated 类显示表单在提交之前需要填写的内容:</p>
	<form action="" class="was-validated">
	  <div class="form-group">
		<label for="uname">Username:</label>
		<input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
		<div class="valid-feedback">验证成功!</div>
		<div class="invalid-feedback">请输入用户名!</div>
	  </div>
	  <div class="form-group">
		<label for="pwd">Password:</label>
		<input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
		<div class="valid-feedback">验证成功!</div>
		<div class="invalid-feedback">请输入密码!</div>
	  </div>
	  <div class="form-group form-check">
		<label class="form-check-label">
		  <input class="form-check-input" type="checkbox" name="remember" required> 同意协议
		  <div class="valid-feedback">验证成功!</div>
		  <div class="invalid-feedback">同意协议才能提交。</div>
		</label>
	  </div>
	  <button type="submit" class="btn btn-primary">提交</button>
	</form>
</div>

</body>
</html>

实例

使用 .needs-validation,它将在表单提交之后验证缺少的内容。这里需要添加一些 JavaScript 代码才能使代码正常工作:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container">
  <h2>表单验证</h2>
  <p>使用 .needs-validation,它将在表单提交之后验证缺少的内容。这里需要添加一些 js 代码才能使代码正常工作。</p>
  <p>可以点击提交按钮查看效果。</p>
	<form action="" class="needs-validation" novalidate>
	  <div class="form-group">
		<label for="uname">Username:</label>
		<input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
		<div class="valid-feedback">验证成功!</div>
		<div class="invalid-feedback">请输入用户名!</div>
	  </div>
	  <div class="form-group">
		<label for="pwd">Password:</label>
		<input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
		<div class="valid-feedback">验证成功!</div>
		<div class="invalid-feedback">请输入密码!</div>
	  </div>
	  <div class="form-group form-check">
		<label class="form-check-label">
		  <input class="form-check-input" type="checkbox" name="remember" required> 同意协议
		  <div class="valid-feedback">验证成功!</div>
		  <div class="invalid-feedback">同意协议才能提交。</div>
		</label>
	  </div>
	  <button type="submit" class="btn btn-primary">提交</button>
	</form>
</div>

<script>
// 如果验证不通过禁止提交表单
(function() {
  'use strict';
  window.addEventListener('load', function() {
    // 获取表单验证样式
    var forms = document.getElementsByClassName('needs-validation');
    // 循环并禁止提交
    var validation = Array.prototype.filter.call(forms, function(form) {
      form.addEventListener('submit', function(event) {
        if (form.checkValidity() === false) {
          event.preventDefault();
          event.stopPropagation();
        }
        form.classList.add('was-validated');
      }, false);
    });
  }, false);
})();
</script>

</body>
</html>




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