<!DOCTYPE html>
<!--
* CoreUI - Free Bootstrap Admin Template
* @version v5.2.0
* @link https://coreui.io/product/free-bootstrap-admin-template/
* Copyright (c) 2025 creativeLabs Łukasz Holeczek
* Licensed under MIT (https://github.com/coreui/coreui-free-bootstrap-admin-template/blob/main/LICENSE)
-->
<html lang="en">
<head>
<base href="./../">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0, shrink-to-fit=no">
<meta name="description" content="CoreUI - Open Source Bootstrap Admin Template">
<meta name="author" content="Łukasz Holeczek">
<meta name="keyword" content="Bootstrap,Admin,Template,Open,Source,jQuery,CSS,HTML,RWD,Dashboard">
<title>CoreUI Free Bootstrap Admin Template</title>
<link rel="apple-touch-icon" sizes="57x57" href="assets/favicon/apple-icon-57x57.png">
<link rel="apple-touch-icon" sizes="60x60" href="assets/favicon/apple-icon-60x60.png">
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<link rel="apple-touch-icon" sizes="76x76" href="assets/favicon/apple-icon-76x76.png">
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<link rel="apple-touch-icon" sizes="152x152" href="assets/favicon/apple-icon-152x152.png">
<link rel="apple-touch-icon" sizes="180x180" href="assets/favicon/apple-icon-180x180.png">
<link rel="icon" type="image/png" sizes="192x192" href="assets/favicon/android-icon-192x192.png">
<link rel="icon" type="image/png" sizes="32x32" href="assets/favicon/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="96x96" href="assets/favicon/favicon-96x96.png">
<link rel="icon" type="image/png" sizes="16x16" href="assets/favicon/favicon-16x16.png">
<link rel="manifest" href="assets/favicon/manifest.json">
<meta name="msapplication-TileColor" content="#ffffff">
<meta name="msapplication-TileImage" content="assets/favicon/ms-icon-144x144.png">
<meta name="theme-color" content="#ffffff">
<!-- Vendors styles-->
<link rel="stylesheet" href="node_modules/simplebar/dist/simplebar.css">
<link rel="stylesheet" href="css/vendors/simplebar.css">
<!-- Main styles for this application-->
<link href="css/style.css" rel="stylesheet">
<!-- We use those styles to show code examples, you should remove them in your application.-->
<link href="css/examples.css" rel="stylesheet">
<script src="js/config.js"></script>
<script src="js/color-modes.js"></script>
<link rel="canonical" href="https://coreui.io/docs/forms/validation/">
</head>
<body>
<div class="sidebar sidebar-dark sidebar-fixed border-end" id="sidebar">
<div class="sidebar-header border-bottom">
<div class="sidebar-brand">
<svg class="sidebar-brand-full" width="88" height="32" alt="CoreUI Logo">
<use xlink:href="assets/brand/coreui.svg#full"></use>
</svg>
<svg class="sidebar-brand-narrow" width="32" height="32" alt="CoreUI Logo">
<use xlink:href="assets/brand/coreui.svg#signet"></use>
</svg>
</div>
<button class="btn-close d-lg-none" type="button" data-coreui-theme="dark" aria-label="Close" onclick="coreui.Sidebar.getInstance(document.querySelector("#sidebar")).toggle()"></button>
</div>
<ul class="sidebar-nav" data-coreui="navigation" data-simplebar>
<li class="nav-item"><a class="nav-link" href="index.html">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-speedometer"></use>
</svg> Dashboard<span class="badge badge-sm bg-info ms-auto">NEW</span></a></li>
<li class="nav-title">Theme</li>
<li class="nav-item"><a class="nav-link" href="colors.html">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-drop"></use>
</svg> Colors</a></li>
<li class="nav-item"><a class="nav-link" href="typography.html">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-pencil"></use>
</svg> Typography</a></li>
<li class="nav-title">Components</li>
<li class="nav-group"><a class="nav-link nav-group-toggle" href="#">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-puzzle"></use>
</svg> Base</a>
<ul class="nav-group-items compact">
<li class="nav-item"><a class="nav-link" href="base/accordion.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Accordion</a></li>
<li class="nav-item"><a class="nav-link" href="base/breadcrumb.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Breadcrumb</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/components/calendar/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Calendar
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="base/cards.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Cards</a></li>
<li class="nav-item"><a class="nav-link" href="base/carousel.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Carousel</a></li>
<li class="nav-item"><a class="nav-link" href="base/collapse.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Collapse</a></li>
<li class="nav-item"><a class="nav-link" href="base/list-group.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> List group</a></li>
<li class="nav-item"><a class="nav-link" href="base/navs-tabs.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Navs & Tabs</a></li>
<li class="nav-item"><a class="nav-link" href="base/pagination.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Pagination</a></li>
<li class="nav-item"><a class="nav-link" href="base/placeholders.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Placeholders</a></li>
<li class="nav-item"><a class="nav-link" href="base/popovers.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Popovers</a></li>
<li class="nav-item"><a class="nav-link" href="base/progress.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Progress</a></li>
<li class="nav-item"><a class="nav-link" href="base/spinners.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Spinners</a></li>
<li class="nav-item"><a class="nav-link" href="base/tables.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Tables</a></li>
<li class="nav-item"><a class="nav-link" href="base/tooltips.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Tooltips</a></li>
</ul>
</li>
<li class="nav-group"><a class="nav-link nav-group-toggle" href="#">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-cursor"></use>
</svg> Buttons</a>
<ul class="nav-group-items compact">
<li class="nav-item"><a class="nav-link" href="buttons/buttons.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Buttons</a></li>
<li class="nav-item"><a class="nav-link" href="buttons/button-group.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Buttons Group</a></li>
<li class="nav-item"><a class="nav-link" href="buttons/dropdowns.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Dropdowns</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/components/loading-buttons/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Loading Buttons
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
</ul>
</li>
<li class="nav-item"><a class="nav-link" href="charts.html">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-chart-pie"></use>
</svg> Charts</a></li>
<li class="nav-group"><a class="nav-link nav-group-toggle" href="#">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-notes"></use>
</svg> Forms</a>
<ul class="nav-group-items compact">
<li class="nav-item"><a class="nav-link" href="forms/form-control.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Form Control</a></li>
<li class="nav-item"><a class="nav-link" href="forms/select.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Select</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/forms/multi-select/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Multi Select
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="forms/checks-radios.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Checks and radios</a></li>
<li class="nav-item"><a class="nav-link" href="forms/range.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Range</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/forms/range-slider/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Range Slider
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="forms/input-group.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Input group</a></li>
<li class="nav-item"><a class="nav-link" href="forms/floating-labels.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Floating labels</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/forms/date-picker/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Date Picker
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/forms/date-range-picker/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Date Range Picker<span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/forms/rating/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Rating
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/bootstrap/docs/forms/time-picker/" target="_blank"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Time Picker
<svg class="icon icon-sm ms-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-external-link"></use>
</svg><span class="badge badge-sm bg-danger ms-auto">PRO</span></a></li>
<li class="nav-item"><a class="nav-link" href="forms/layout.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Layout</a></li>
<li class="nav-item"><a class="nav-link" href="forms/validation.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Validation</a></li>
</ul>
</li>
<li class="nav-group"><a class="nav-link nav-group-toggle" href="#">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-star"></use>
</svg> Icons</a>
<ul class="nav-group-items compact">
<li class="nav-item"><a class="nav-link" href="icons/coreui-icons-free.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> CoreUI Icons<span class="badge badge-sm bg-success ms-auto">Free</span></a></li>
<li class="nav-item"><a class="nav-link" href="icons/coreui-icons-brand.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> CoreUI Icons - Brand</a></li>
<li class="nav-item"><a class="nav-link" href="icons/coreui-icons-flag.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> CoreUI Icons - Flag</a></li>
</ul>
</li>
<li class="nav-group"><a class="nav-link nav-group-toggle" href="#">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-bell"></use>
</svg> Notifications</a>
<ul class="nav-group-items compact">
<li class="nav-item"><a class="nav-link" href="notifications/alerts.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Alerts</a></li>
<li class="nav-item"><a class="nav-link" href="notifications/badge.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Badge</a></li>
<li class="nav-item"><a class="nav-link" href="notifications/modals.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Modals</a></li>
<li class="nav-item"><a class="nav-link" href="notifications/toasts.html"><span class="nav-icon"><span class="nav-icon-bullet"></span></span> Toasts</a></li>
</ul>
</li>
<li class="nav-item"><a class="nav-link" href="widgets.html">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-calculator"></use>
</svg> Widgets<span class="badge badge-sm bg-info ms-auto">NEW</span></a></li>
<li class="nav-divider"></li>
<li class="nav-title">Extras</li>
<li class="nav-group"><a class="nav-link nav-group-toggle" href="#">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-star"></use>
</svg> Pages</a>
<ul class="nav-group-items compact">
<li class="nav-item"><a class="nav-link" href="login.html" target="_top">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-account-logout"></use>
</svg> Login</a></li>
<li class="nav-item"><a class="nav-link" href="register.html" target="_top">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-account-logout"></use>
</svg> Register</a></li>
<li class="nav-item"><a class="nav-link" href="404.html" target="_top">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-bug"></use>
</svg> Error 404</a></li>
<li class="nav-item"><a class="nav-link" href="500.html" target="_top">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-bug"></use>
</svg> Error 500</a></li>
</ul>
</li>
<li class="nav-item mt-auto"><a class="nav-link" href="https://coreui.io/docs/templates/installation/" target="_blank">
<svg class="nav-icon">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-description"></use>
</svg> Docs</a></li>
<li class="nav-item"><a class="nav-link text-primary fw-semibold" href="https://coreui.io/product/bootstrap-dashboard-template/" target="_top">
<svg class="nav-icon text-primary">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-layers"></use>
</svg> Try CoreUI PRO</a></li>
</ul>
<div class="sidebar-footer border-top d-none d-md-flex">
<button class="sidebar-toggler" type="button" data-coreui-toggle="unfoldable"></button>
</div>
</div>
<div class="wrapper d-flex flex-column min-vh-100">
<header class="header header-sticky p-0 mb-4">
<div class="container-fluid border-bottom px-4">
<button class="header-toggler" type="button" onclick="coreui.Sidebar.getInstance(document.querySelector('#sidebar')).toggle()" style="margin-inline-start: -14px;">
<svg class="icon icon-lg">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-menu"></use>
</svg>
</button>
<ul class="header-nav d-none d-lg-flex">
<li class="nav-item"><a class="nav-link" href="#">Dashboard</a></li>
<li class="nav-item"><a class="nav-link" href="#">Users</a></li>
<li class="nav-item"><a class="nav-link" href="#">Settings</a></li>
</ul>
<ul class="header-nav ms-auto">
<li class="nav-item"><a class="nav-link" href="#">
<svg class="icon icon-lg">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-bell"></use>
</svg></a></li>
<li class="nav-item"><a class="nav-link" href="#">
<svg class="icon icon-lg">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-list-rich"></use>
</svg></a></li>
<li class="nav-item"><a class="nav-link" href="#">
<svg class="icon icon-lg">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-envelope-open"></use>
</svg></a></li>
</ul>
<ul class="header-nav">
<li class="nav-item py-1">
<div class="vr h-100 mx-2 text-body text-opacity-75"></div>
</li>
<li class="nav-item dropdown">
<button class="btn btn-link nav-link py-2 px-2 d-flex align-items-center" type="button" aria-expanded="false" data-coreui-toggle="dropdown">
<svg class="icon icon-lg theme-icon-active">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-contrast"></use>
</svg>
</button>
<ul class="dropdown-menu dropdown-menu-end" style="--cui-dropdown-min-width: 8rem;">
<li>
<button class="dropdown-item d-flex align-items-center" type="button" data-coreui-theme-value="light">
<svg class="icon icon-lg me-3">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-sun"></use>
</svg>Light
</button>
</li>
<li>
<button class="dropdown-item d-flex align-items-center" type="button" data-coreui-theme-value="dark">
<svg class="icon icon-lg me-3">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-moon"></use>
</svg>Dark
</button>
</li>
<li>
<button class="dropdown-item d-flex align-items-center active" type="button" data-coreui-theme-value="auto">
<svg class="icon icon-lg me-3">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-contrast"></use>
</svg>Auto
</button>
</li>
</ul>
</li>
<li class="nav-item py-1">
<div class="vr h-100 mx-2 text-body text-opacity-75"></div>
</li>
<li class="nav-item dropdown"><a class="nav-link py-0 pe-0" data-coreui-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
<div class="avatar avatar-md"><img class="avatar-img" src="assets/img/avatars/8.jpg" alt="user@email.com"></div></a>
<div class="dropdown-menu dropdown-menu-end pt-0">
<div class="dropdown-header bg-body-tertiary text-body-secondary fw-semibold rounded-top mb-2">Account</div><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-bell"></use>
</svg> Updates<span class="badge badge-sm bg-info ms-2">42</span></a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-envelope-open"></use>
</svg> Messages<span class="badge badge-sm bg-success ms-2">42</span></a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-task"></use>
</svg> Tasks<span class="badge badge-sm bg-danger ms-2">42</span></a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-comment-square"></use>
</svg> Comments<span class="badge badge-sm bg-warning ms-2">42</span></a>
<div class="dropdown-header bg-body-tertiary text-body-secondary fw-semibold my-2">
<div class="fw-semibold">Settings</div>
</div><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-user"></use>
</svg> Profile</a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-settings"></use>
</svg> Settings</a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-credit-card"></use>
</svg> Payments<span class="badge badge-sm bg-secondary ms-2">42</span></a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-file"></use>
</svg> Projects<span class="badge badge-sm bg-primary ms-2">42</span></a>
<div class="dropdown-divider"></div><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-lock-locked"></use>
</svg> Lock Account</a><a class="dropdown-item" href="#">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-account-logout"></use>
</svg> Logout</a>
</div>
</li>
</ul>
</div>
<div class="container-fluid px-4">
<nav aria-label="breadcrumb">
<ol class="breadcrumb my-0">
<li class="breadcrumb-item"><a href="#">Home</a>
</li>
<li class="breadcrumb-item"><span>Components</span>
</li>
<li class="breadcrumb-item"><span>Forms</span>
</li>
<li class="breadcrumb-item active"><span>Validation</span>
</li>
</ol>
</nav>
</div>
</header>
<div class="body flex-grow-1">
<div class="container-lg px-4">
<div class="bg-primary bg-opacity-10 border border-2 border-primary rounded mb-4">
<div class="row d-flex align-items-center p-3 px-xl-4 flex-xl-nowrap">
<div class="col-xl-auto col-12 d-none d-xl-block p-0"><img class="img-fluid" src="assets/img/components.webp" width="160px" height="160px" alt="CoreUI PRO hexagon"></div>
<div class="col-md col-12 px-lg-4">
Our Admin Panel isn’t just a mix of third-party components. It’s <strong>the only open-source Bootstrap dashboard built on a professional, enterprise-grade UI Components Library</strong>.
This component is part of this library, and we present only the basic usage of it here. To explore extended examples, detailed API documentation, and customization options, refer to our docs.
</div>
<div class="col-md-auto col-12 mt-3 mt-lg-0"><a class="btn btn-primary text-nowrap text-white" href="https://coreui.io/docs/forms/validation/" target="_blank" rel="noopener noreferrer">Explore Documentation</a></div>
</div>
</div>
<div class="row">
<div class="col-12">
<div class="card mb-4">
<div class="card-header"><strong>Form validation</strong><span class="small ms-1">Custom styles</span></div>
<div class="card-body">
<p class="text-body-secondary small">For custom CoreUI for Bootstrap form validation messages, you’ll need to add the <code>novalidate</code> boolean attribute to your <code><form></code>. This disables the browser default feedback tooltips, but still provides access to the form validation APIs in JavaScript. Try to submit the form below; our JavaScript will intercept the submit button and relay feedback to you. When attempting to submit, you’ll see the <code>:invalid</code> and <code>:valid</code> styles applied to your form controls.</p>
<p class="text-body-secondary small">Custom feedback styles apply custom colors, borders, focus styles, and background icons to better communicate feedback. Background icons for <code><select></code>s are only available with <code>.form-select</code>, and not <code>.form-control</code>.</p>
<div class="example">
<ul class="nav nav-underline-border" role="tablist">
<li class="nav-item"><a class="nav-link active" data-coreui-toggle="tab" href="#preview-1000" role="tab">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-media-play"></use>
</svg>Preview</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/docs/forms/validation/#custom-styles" target="_blank">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-code"></use>
</svg>Code</a></li>
</ul>
<div class="tab-content rounded-bottom">
<div class="tab-pane p-3 active preview" role="tabpanel" id="preview-1000">
<form class="row g-3 needs-validation" novalidate>
<div class="col-md-4">
<label class="form-label" for="validationCustom01">First name</label>
<input class="form-control" id="validationCustom01" type="text" value="Mark" required>
<div class="valid-feedback">Looks good!</div>
</div>
<div class="col-md-4">
<label class="form-label" for="validationCustom02">Last name</label>
<input class="form-control" id="validationCustom02" type="text" value="Otto" required>
<div class="valid-feedback">Looks good!</div>
</div>
<div class="col-md-4">
<label class="form-label" for="validationCustomUsername">Username</label>
<div class="input-group has-validation"><span class="input-group-text" id="inputGroupPrepend">@</span>
<input class="form-control" id="validationCustomUsername" type="text" aria-describedby="inputGroupPrepend" required>
<div class="invalid-feedback">Please choose a username.</div>
</div>
</div>
<div class="col-md-6">
<label class="form-label" for="validationCustom03">City</label>
<input class="form-control" id="validationCustom03" type="text" required>
<div class="invalid-feedback">Please provide a valid city.</div>
</div>
<div class="col-md-3">
<label class="form-label" for="validationCustom04">State</label>
<select class="form-select" id="validationCustom04" required>
<option selected disabled value>Choose...</option>
<option>...</option>
</select>
<div class="invalid-feedback">Please select a valid state.</div>
</div>
<div class="col-md-3">
<label class="form-label" for="validationCustom05">Zip</label>
<input class="form-control" id="validationCustom05" type="text" required>
<div class="invalid-feedback">Please provide a valid zip.</div>
</div>
<div class="col-12">
<div class="form-check">
<input class="form-check-input" id="invalidCheck" type="checkbox" required>
<label class="form-check-label" for="invalidCheck">Agree to terms and conditions</label>
<div class="invalid-feedback">You must agree before submitting.</div>
</div>
</div>
<div class="col-12">
<button class="btn btn-primary" type="submit">Submit form</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="col-12">
<div class="card mb-4">
<div class="card-header"><strong>Form validation</strong><span class="small ms-1">Browser defaults</span></div>
<div class="card-body">
<p class="text-body-secondary small">Not interested in custom validation feedback messages or writing JavaScript to change form behaviors? All good, you can use the browser defaults. Try submitting the form below. Depending on your browser and OS, you’ll see a slightly different style of feedback.</p>
<p class="text-body-secondary small">While these feedback styles cannot be styled with CSS, you can still customize the feedback text through JavaScript.</p>
<div class="example">
<ul class="nav nav-underline-border" role="tablist">
<li class="nav-item"><a class="nav-link active" data-coreui-toggle="tab" href="#preview-1001" role="tab">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-media-play"></use>
</svg>Preview</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/docs/forms/validation/#browser-defaults" target="_blank">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-code"></use>
</svg>Code</a></li>
</ul>
<div class="tab-content rounded-bottom">
<div class="tab-pane p-3 active preview" role="tabpanel" id="preview-1001">
<form class="row g-3">
<div class="col-md-4">
<label class="form-label" for="validationDefault01">First name</label>
<input class="form-control" id="validationDefault01" type="text" value="Mark" required>
</div>
<div class="col-md-4">
<label class="form-label" for="validationDefault02">Last name</label>
<input class="form-control" id="validationDefault02" type="text" value="Otto" required>
</div>
<div class="col-md-4">
<label class="form-label" for="validationDefaultUsername">Username</label>
<div class="input-group"><span class="input-group-text" id="inputGroupPrepend2">@</span>
<input class="form-control" id="validationDefaultUsername" type="text" aria-describedby="inputGroupPrepend2" required>
</div>
</div>
<div class="col-md-6">
<label class="form-label" for="validationDefault03">City</label>
<input class="form-control" id="validationDefault03" type="text" required>
</div>
<div class="col-md-3">
<label class="form-label" for="validationDefault04">State</label>
<select class="form-select" id="validationDefault04" required>
<option selected disabled value>Choose...</option>
<option>...</option>
</select>
</div>
<div class="col-md-3">
<label class="form-label" for="validationDefault05">Zip</label>
<input class="form-control" id="validationDefault05" type="text" required>
</div>
<div class="col-12">
<div class="form-check">
<input class="form-check-input" id="invalidCheck2" type="checkbox" required>
<label class="form-check-label" for="invalidCheck2">Agree to terms and conditions</label>
</div>
</div>
<div class="col-12">
<button class="btn btn-primary" type="submit">Submit form</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="col-12">
<div class="card mb-4">
<div class="card-header"><strong>Form validation</strong><span class="small ms-1">Server side</span></div>
<div class="card-body">
<p class="text-body-secondary small">We recommend using client-side validation, but in case you require server-side validation, you can indicate invalid and valid form fields with <code>.is-invalid</code> and <code>.is-valid</code>. Note that <code>.invalid-feedback</code> is also supported with these classes.</p>
<p class="text-body-secondary small">For invalid fields, ensure that the invalid feedback/error message is associated with the relevant form field using <code>aria-describedby</code> (noting that this attribute allows more than one <code>id</code> to be referenced, in case the field already points to additional form text).</p>
<p class="text-body-secondary small">To fix<a href="https://github.com/twbs/bootstrap/issues/25110">issues with border radii</a>, input groups require an additional <code>.has-validation</code> class.</p>
<div class="example">
<ul class="nav nav-underline-border" role="tablist">
<li class="nav-item"><a class="nav-link active" data-coreui-toggle="tab" href="#preview-1002" role="tab">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-media-play"></use>
</svg>Preview</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/docs/forms/validation/#server-side" target="_blank">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-code"></use>
</svg>Code</a></li>
</ul>
<div class="tab-content rounded-bottom">
<div class="tab-pane p-3 active preview" role="tabpanel" id="preview-1002">
<form class="row g-3">
<div class="col-md-4">
<label class="form-label" for="validationServer01">First name</label>
<input class="form-control is-valid" id="validationServer01" type="text" value="Mark" required>
<div class="valid-feedback">Looks good!</div>
</div>
<div class="col-md-4">
<label class="form-label" for="validationServer02">Last name</label>
<input class="form-control is-valid" id="validationServer02" type="text" value="Otto" required>
<div class="valid-feedback">Looks good!</div>
</div>
<div class="col-md-4">
<label class="form-label" for="validationServerUsername">Username</label>
<div class="input-group has-validation"><span class="input-group-text" id="inputGroupPrepend3">@</span>
<input class="form-control is-invalid" id="validationServerUsername" type="text" aria-describedby="inputGroupPrepend3 validationServerUsernameFeedback" required>
<div class="invalid-feedback" id="validationServerUsernameFeedback">Please choose a username.</div>
</div>
</div>
<div class="col-md-6">
<label class="form-label" for="validationServer03">City</label>
<input class="form-control is-invalid" id="validationServer03" type="text" aria-describedby="validationServer03Feedback" required>
<div class="invalid-feedback" id="validationServer03Feedback">Please provide a valid city.</div>
</div>
<div class="col-md-3">
<label class="form-label" for="validationServer04">State</label>
<select class="form-select is-invalid" id="validationServer04" aria-describedby="validationServer04Feedback" required>
<option selected disabled value>Choose...</option>
<option>...</option>
</select>
<div class="invalid-feedback" id="validationServer04Feedback">Please select a valid state.</div>
</div>
<div class="col-md-3">
<label class="form-label" for="validationServer05">Zip</label>
<input class="form-control is-invalid" id="validationServer05" type="text" aria-describedby="validationServer05Feedback" required>
<div class="invalid-feedback" id="validationServer05Feedback">Please provide a valid zip.</div>
</div>
<div class="col-12">
<div class="form-check">
<input class="form-check-input is-invalid" id="invalidCheck3" type="checkbox" aria-describedby="invalidCheck3Feedback" required>
<label class="form-check-label" for="invalidCheck3">Agree to terms and conditions</label>
<div class="invalid-feedback" id="invalidCheck3Feedback">
You must agree before submitting.
</div>
</div>
</div>
<div class="col-12">
<button class="btn btn-primary" type="submit">Submit form</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="col-12">
<div class="card mb-4">
<div class="card-header"><strong>Form validation</strong><span class="small ms-1">Supported elements</span></div>
<div class="card-body">
<p class="text-body-secondary small">Validation styles are available for the following form controls and components:</p>
<ul>
<li><code><input></code>s and <code><textarea></code>s with <code>.form-control</code> (including up to one <code>.form-control</code> in input groups)</li>
<li><code><select></code><code>.form-select</code></li>
<li><code>.form-check</code>s</li>
</ul>
<div class="example">
<ul class="nav nav-underline-border" role="tablist">
<li class="nav-item"><a class="nav-link active" data-coreui-toggle="tab" href="#preview-1003" role="tab">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-media-play"></use>
</svg>Preview</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/docs/forms/validation/#supported-elements" target="_blank">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-code"></use>
</svg>Code</a></li>
</ul>
<div class="tab-content rounded-bottom">
<div class="tab-pane p-3 active preview" role="tabpanel" id="preview-1003">
<form class="was-validated">
<div class="mb-3">
<label class="form-label" for="validationTextarea">Textarea</label>
<textarea class="form-control is-invalid" id="validationTextarea" placeholder="Required example textarea" required></textarea>
<div class="invalid-feedback">Please enter a message in the textarea.</div>
</div>
<div class="form-check mb-3">
<input class="form-check-input" id="validationFormCheck1" type="checkbox" required>
<label class="form-check-label" for="validationFormCheck1">Check this checkbox</label>
<div class="invalid-feedback">Example invalid feedback text</div>
</div>
<div class="form-check">
<input class="form-check-input" id="validationFormCheck2" type="radio" name="radio-stacked" required>
<label class="form-check-label" for="validationFormCheck2">Toggle this radio</label>
</div>
<div class="form-check mb-3">
<input class="form-check-input" id="validationFormCheck3" type="radio" name="radio-stacked" required>
<label class="form-check-label" for="validationFormCheck3">Or toggle this other radio</label>
<div class="invalid-feedback">More example invalid feedback text</div>
</div>
<div class="mb-3">
<select class="form-select" required aria-label="select example">
<option value>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>
<div class="invalid-feedback">Example invalid select feedback</div>
</div>
<div class="mb-3">
<input class="form-control" type="file" aria-label="file example" required>
<div class="invalid-feedback">Example invalid form file feedback</div>
</div>
<div class="mb-3">
<button class="btn btn-primary" type="submit" disabled>Submit form</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="col-12">
<div class="card mb-4">
<div class="card-header"><strong>Form validation</strong><span class="small ms-1">Tooltips</span></div>
<div class="card-body">
<p class="text-body-secondary small">If your form layout allows it, you can swap the <code>.{valid|invalid}-feedback</code> classes for <code>.{valid|invalid}-tooltip</code> classes to display validation feedback in a styled tooltip. Be sure to have a parent with <code>position: relative</code> on it for tooltip positioning. In the example below, our column classes have this already, but your project may require an alternative setup.</p>
<div class="example">
<ul class="nav nav-underline-border" role="tablist">
<li class="nav-item"><a class="nav-link active" data-coreui-toggle="tab" href="#preview-1004" role="tab">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-media-play"></use>
</svg>Preview</a></li>
<li class="nav-item"><a class="nav-link" href="https://coreui.io/docs/forms/validation/#tooltips" target="_blank">
<svg class="icon me-2">
<use xlink:href="node_modules/@coreui/icons/sprites/free.svg#cil-code"></use>
</svg>Code</a></li>
</ul>
<div class="tab-content rounded-bottom">
<div class="tab-pane p-3 active preview" role="tabpanel" id="preview-1004">
<form class="row g-3 needs-validation" novalidate>
<div class="col-md-4 position-relative">
<label class="form-label" for="validationTooltip01">First name</label>
<input class="form-control" id="validationTooltip01" type="text" value="Mark" required>
<div class="valid-tooltip">Looks good!</div>
</div>
<div class="col-md-4 position-relative">
<label class="form-label" for="validationTooltip02">Last name</label>
<input class="form-control" id="validationTooltip02" type="text" value="Otto" required>
<div class="valid-tooltip">Looks good!</div>
</div>
<div class="col-md-4 position-relative">
<label class="form-label" for="validationTooltipUsername">Username</label>
<div class="input-group has-validation"><span class="input-group-text" id="validationTooltipUsernamePrepend">@</span>
<input class="form-control" id="validationTooltipUsername" type="text" aria-describedby="validationTooltipUsernamePrepend" required>
<div class="invalid-tooltip">Please choose a unique and valid username.</div>
</div>
</div>
<div class="col-md-6 position-relative">
<label class="form-label" for="validationTooltip03">City</label>
<input class="form-control" id="validationTooltip03" type="text" required>
<div class="invalid-tooltip">Please provide a valid city.</div>
</div>
<div class="col-md-3 position-relative">
<label class="form-label" for="validationTooltip04">State</label>
<select class="form-select" id="validationTooltip04" required>
<option selected disabled value>Choose...</option>
<option>...</option>
</select>
<div class="invalid-tooltip">Please select a valid state.</div>
</div>
<div class="col-md-3 position-relative">
<label class="form-label" for="validationTooltip05">Zip</label>
<input class="form-control" id="validationTooltip05" type="text" required>
<div class="invalid-tooltip">Please provide a valid zip.</div>
</div>
<div class="col-12">
<button class="btn btn-primary" type="submit">Submit form</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<footer class="footer px-4">
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<div class="ms-auto">Powered by <a href="https://coreui.io/docs/">CoreUI UI Components</a></div>
</footer>
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// Fetch all the forms we want to apply custom Bootstrap validation styles to
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form.addEventListener('submit', function (event) {
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