Bootstrap5 表单验证

最后更新于:2022-03-27 03:03:50

Bootstrap5 表单验证

我们可以使用不同的验证类来设置表单的验证功能。

.was-validated.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.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:

<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>

尝试一下 »

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:

<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>

<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>

尝试一下 »