HTML 所需的表单验证未给出任何警告
HTML required form validation is not giving any warning
我有一张登记表，我有 3 个输入。当我 post 控制器的值时它们运行良好，但是当我不填写它们并单击提交按钮时，它不允许我提交此表单。当它不允许我提交它时，它应该向我发出有关 'This field is required' 等输入的警告，但它不会给我那个错误。
形式：
<div class="form-container">
<div class="form-form">
<div class="form-form-wrap">
<div class="form-container">
<div class="form-content">
<h1 class="">Get started with a <br /> free account</h1>
<p class="signup-link">Already have an account? <a href="auth_login.html">Log in</a></p>
<form class="text-left" asp-action="Register" method="post">
<div class="form">
<div id="username-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-user"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path><circle cx="12" cy="7" r="4"></circle></svg>
<input asp-for="User.UserName" type="text" class="form-control" placeholder="Username" required>
<span asp-validation-for="User.UserName" class="text-danger"></span>
</div>
<div id="email-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-at-sign"><circle cx="12" cy="12" r="4"></circle><path d="M16 8v5a3 3 0 0 0 6 0v-1a10 10 0 1 0-3.92 7.94"></path></svg>
<input asp-for="User.UserEMail" type="text" value="" placeholder="Email" required>
<span asp-validation-for="User.UserEMail" class="text-danger"></span>
</div>
<div id="password-field" class="field-wrapper input mb-2">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-lock"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect><path d="M7 11V7a5 5 0 0 1 10 0v4"></path></svg>
<input asp-for="User.UserPassword" type="password" value="" placeholder="Password" required>
<span asp-validation-for="User.UserPassword" class="text-danger"></span>
</div>
<div class="field-wrapper terms_condition">
<div class="n-chk new-checkbox checkbox-outline-primary">
<label class="new-control new-checkbox checkbox-outline-primary">
<input type="checkbox" class="new-control-input">
<span class="new-control-indicator"></span><span>I agree to the <a href="javascript:void(0);"> terms and conditions </a></span>
</label>
</div>
</div>
<div class="d-sm-flex justify-content-between">
<div class="field-wrapper toggle-pass">
<p class="d-inline-block">Show Password</p>
<label class="switch s-primary">
<input type="checkbox" id="toggle-password" class="d-none">
<span class="slider round"></span>
</label>
</div>
<div class="field-wrapper">
<button type="submit" name="Register" class="btn btn-primary">Get Started!</button>
</div>
</div>
</div>
</form>
<p class="terms-conditions">© 2020 All Rights Reserved. <a href="index.html">CORK</a> is a product of Designreset. <a href="javascript:void(0);">Cookie Preferences</a>, <a href="javascript:void(0);">Privacy</a>, and <a href="javascript:void(0);">Terms</a>.</p>
</div>
</div>
</div>
</div>
<div class="form-image">
<div class="l-image">
</div>
</div>
</div>
我认为有一些东西可以覆盖这些警告并且不让它们变得可见，但我就是找不到它。当我删除 <span asp-validation-for="****" class="text-danger"></span> 时，它仍然是一样的。我不知道我哪里错了，希望有人能帮助我。
将 required 属性添加到输入字段。
The Boolean required attribute, if present, indicates that the user must specify a value for the input before the owning form can be submitted.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="form-container">
<div class="form-form">
<div class="form-form-wrap">
<div class="form-container">
<div class="form-content">
<h1 class="">Get started with a <br /> free account</h1>
<p class="signup-link">Already have an account? <a href="auth_login.html">Log in</a></p>
<form class="text-left" asp-action="Register" method="post">
<div class="form">
<div id="username-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-user"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path><circle cx="12" cy="7" r="4"></circle></svg>
<input asp-for="User.UserName" type="text" class="form-control" placeholder="Username" required>
<span asp-validation-for="User.UserName" class="text-danger"></span>
</div>
<div id="email-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-at-sign"><circle cx="12" cy="12" r="4"></circle><path d="M16 8v5a3 3 0 0 0 6 0v-1a10 10 0 1 0-3.92 7.94"></path></svg>
<input asp-for="User.UserEMail" type="text" value="" placeholder="Email" required>
<span asp-validation-for="User.UserEMail" class="text-danger"></span>
</div>
<div id="password-field" class="field-wrapper input mb-2">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-lock"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect><path d="M7 11V7a5 5 0 0 1 10 0v4"></path></svg>
<input asp-for="User.UserPassword" type="password" value="" placeholder="Password" required>
<span asp-validation-for="User.UserPassword" class="text-danger"></span>
</div>
<div class="field-wrapper terms_condition">
<div class="n-chk new-checkbox checkbox-outline-primary">
<label class="new-control new-checkbox checkbox-outline-primary">
<input type="checkbox" class="new-control-input">
<span class="new-control-indicator"></span><span>I agree to the <a href="javascript:void(0);"> terms and conditions </a></span>
</label>
</div>
</div>
<div class="d-sm-flex justify-content-between">
<div class="field-wrapper toggle-pass">
<p class="d-inline-block">Show Password</p>
<label class="switch s-primary">
<input type="checkbox" id="toggle-password" class="d-none">
<span class="slider round"></span>
</label>
</div>
<div class="field-wrapper">
<button type="submit" name="Register" class="btn btn-primary">Get Started!</button>
</div>
</div>
</div>
</form>
<p class="terms-conditions">© 2020 All Rights Reserved. <a href="index.html">CORK</a> is a product of Designreset. <a href="javascript:void(0);">Cookie Preferences</a>, <a href="javascript:void(0);">Privacy</a>, and <a href="javascript:void(0);">Terms</a>.</p>
</div>
</div>
</div>
</div>
<div class="form-image">
<div class="l-image">
</div>
</div>
</div>
</body>
</html>
我有一张登记表，我有 3 个输入。当我 post 控制器的值时它们运行良好，但是当我不填写它们并单击提交按钮时，它不允许我提交此表单。当它不允许我提交它时，它应该向我发出有关 'This field is required' 等输入的警告，但它不会给我那个错误。
形式：
<div class="form-container">
<div class="form-form">
<div class="form-form-wrap">
<div class="form-container">
<div class="form-content">
<h1 class="">Get started with a <br /> free account</h1>
<p class="signup-link">Already have an account? <a href="auth_login.html">Log in</a></p>
<form class="text-left" asp-action="Register" method="post">
<div class="form">
<div id="username-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-user"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path><circle cx="12" cy="7" r="4"></circle></svg>
<input asp-for="User.UserName" type="text" class="form-control" placeholder="Username" required>
<span asp-validation-for="User.UserName" class="text-danger"></span>
</div>
<div id="email-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-at-sign"><circle cx="12" cy="12" r="4"></circle><path d="M16 8v5a3 3 0 0 0 6 0v-1a10 10 0 1 0-3.92 7.94"></path></svg>
<input asp-for="User.UserEMail" type="text" value="" placeholder="Email" required>
<span asp-validation-for="User.UserEMail" class="text-danger"></span>
</div>
<div id="password-field" class="field-wrapper input mb-2">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-lock"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect><path d="M7 11V7a5 5 0 0 1 10 0v4"></path></svg>
<input asp-for="User.UserPassword" type="password" value="" placeholder="Password" required>
<span asp-validation-for="User.UserPassword" class="text-danger"></span>
</div>
<div class="field-wrapper terms_condition">
<div class="n-chk new-checkbox checkbox-outline-primary">
<label class="new-control new-checkbox checkbox-outline-primary">
<input type="checkbox" class="new-control-input">
<span class="new-control-indicator"></span><span>I agree to the <a href="javascript:void(0);"> terms and conditions </a></span>
</label>
</div>
</div>
<div class="d-sm-flex justify-content-between">
<div class="field-wrapper toggle-pass">
<p class="d-inline-block">Show Password</p>
<label class="switch s-primary">
<input type="checkbox" id="toggle-password" class="d-none">
<span class="slider round"></span>
</label>
</div>
<div class="field-wrapper">
<button type="submit" name="Register" class="btn btn-primary">Get Started!</button>
</div>
</div>
</div>
</form>
<p class="terms-conditions">© 2020 All Rights Reserved. <a href="index.html">CORK</a> is a product of Designreset. <a href="javascript:void(0);">Cookie Preferences</a>, <a href="javascript:void(0);">Privacy</a>, and <a href="javascript:void(0);">Terms</a>.</p>
</div>
</div>
</div>
</div>
<div class="form-image">
<div class="l-image">
</div>
</div>
</div>
我认为有一些东西可以覆盖这些警告并且不让它们变得可见，但我就是找不到它。当我删除 <span asp-validation-for="****" class="text-danger"></span> 时，它仍然是一样的。我不知道我哪里错了，希望有人能帮助我。
将 required 属性添加到输入字段。
The Boolean
requiredattribute, if present, indicates that the user must specify a value for the input before the owning form can be submitted.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="form-container">
<div class="form-form">
<div class="form-form-wrap">
<div class="form-container">
<div class="form-content">
<h1 class="">Get started with a <br /> free account</h1>
<p class="signup-link">Already have an account? <a href="auth_login.html">Log in</a></p>
<form class="text-left" asp-action="Register" method="post">
<div class="form">
<div id="username-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-user"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path><circle cx="12" cy="7" r="4"></circle></svg>
<input asp-for="User.UserName" type="text" class="form-control" placeholder="Username" required>
<span asp-validation-for="User.UserName" class="text-danger"></span>
</div>
<div id="email-field" class="field-wrapper input">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-at-sign"><circle cx="12" cy="12" r="4"></circle><path d="M16 8v5a3 3 0 0 0 6 0v-1a10 10 0 1 0-3.92 7.94"></path></svg>
<input asp-for="User.UserEMail" type="text" value="" placeholder="Email" required>
<span asp-validation-for="User.UserEMail" class="text-danger"></span>
</div>
<div id="password-field" class="field-wrapper input mb-2">
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-lock"><rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect><path d="M7 11V7a5 5 0 0 1 10 0v4"></path></svg>
<input asp-for="User.UserPassword" type="password" value="" placeholder="Password" required>
<span asp-validation-for="User.UserPassword" class="text-danger"></span>
</div>
<div class="field-wrapper terms_condition">
<div class="n-chk new-checkbox checkbox-outline-primary">
<label class="new-control new-checkbox checkbox-outline-primary">
<input type="checkbox" class="new-control-input">
<span class="new-control-indicator"></span><span>I agree to the <a href="javascript:void(0);"> terms and conditions </a></span>
</label>
</div>
</div>
<div class="d-sm-flex justify-content-between">
<div class="field-wrapper toggle-pass">
<p class="d-inline-block">Show Password</p>
<label class="switch s-primary">
<input type="checkbox" id="toggle-password" class="d-none">
<span class="slider round"></span>
</label>
</div>
<div class="field-wrapper">
<button type="submit" name="Register" class="btn btn-primary">Get Started!</button>
</div>
</div>
</div>
</form>
<p class="terms-conditions">© 2020 All Rights Reserved. <a href="index.html">CORK</a> is a product of Designreset. <a href="javascript:void(0);">Cookie Preferences</a>, <a href="javascript:void(0);">Privacy</a>, and <a href="javascript:void(0);">Terms</a>.</p>
</div>
</div>
</div>
</div>
<div class="form-image">
<div class="l-image">
</div>
</div>
</div>
</body>
</html>