Sie können verschiedene Validierungsklassen verwenden, um Benutzern wertvolles Feedback zu geben. Fügen Sie entweder .was-validated oder .needs-validation zum hinzu. ><form>-Element, je nachdem, ob Sie vor oder nach dem Absenden des Formulars Validierungsfeedback geben möchten. Die Eingabefelder haben einen grünen (gültig) oder roten (ungültigen) Rand, um anzuzeigen, was im Formular fehlt. Sie können auch eine .valid-feedback- oder .invalid-feedback-Nachricht hinzufügen, um dem Benutzer explizit mitzuteilen, was fehlt oder muss vor dem Absenden des Formulars erfolgen.
In diesem Beispiel verwenden wir .was-validated, um vor dem Absenden des Formulars anzugeben, was fehlt:
<form action="/action_page.php" class="was-validated">
<div class="mb-3 mt-3">
<label for="uname" class="form-label">Username:</label>
<input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
<div class="valid-feedback">Valid.</div>
<div class="invalid-feedback">Please fill out this field.</div>
</div>
<div class="mb-3">
<label for="pwd" class="form-label">Password:</label>
<input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
<div class="valid-feedback">Valid.</div>
<div class="invalid-feedback">Please fill out this field.</div>
</div>
<div class="form-check mb-3">
<input class="form-check-input" type="checkbox" id="myCheck" name="remember" required>
<label class="form-check-label" for="myCheck">I agree on blabla.</label>
<div class="valid-feedback">Valid.</div>
<div class="invalid-feedback">Check this checkbox to continue.</div>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>Probieren Sie es selbst aus →
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<div class="container mt-3">
<h3>Form Validation</h3>
<p>Try to submit the form.</p>
<form action="/action_page.php" class="was-validated">
<div class="mb-3 mt-3">
<label for="uname" class="form-label">Username:</label>
<input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required>
<div class="valid-feedback">Valid.</div>
<div class="invalid-feedback">Please fill out this field.</div>
</div>
<div class="mb-3">
<label for="pwd" class="form-label">Password:</label>
<input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
<div class="valid-feedback">Valid.</div>
<div class="invalid-feedback">Please fill out this field.</div>
</div>
<div class="form-check mb-3">
<input class="form-check-input" type="checkbox" id="myCheck" name="remember" required>
<label class="form-check-label" for="myCheck">I agree on blabla.</label>
<div class="valid-feedback">Valid.</div>
<div class="invalid-feedback">Check this checkbox to continue.</div>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</body>
</html>