Bootstrap 5 Form Validation
Form Validation
You can use different validation classes to provide valuable feedback to
users. Add either .was-validated or .needs-validation to the <form> element,
depending on whether you want to provide validation feedback before or after
submitting the form. The input fields will have a green (valid) or red (invalid)
border to indicate what's missing in the form. You can also add a
.valid-feedback or .invalid-feedback message to tell the user explicitly what's
missing, or needs to be done before submitting the form.
Example
In this example, we use .was-validated to indicate what's missing before submitting the form:
<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>
Try it Yourself »
