Custom styles
Validating your form, just add the class .form-validate to any <form>, then it validate the form show error message.
Code Example
<form class="row g-3 form-validate" novalidate> <div class="col-md-4"> <label for="validationCustom01" class="form-label">First name</label> <input type="text" class="form-control" id="validationCustom01" value="Mark" required> <div class="valid-feedback"> Looks good! </div> </div> <div class="col-md-4"> <label for="validationCustom02" class="form-label">Last name</label> <input type="text" class="form-control" id="validationCustom02" value="Otto" required> <div class="valid-feedback"> Looks good! </div> </div> <div class="col-md-4"> <label for="validationCustomUsername" class="form-label">Username</label> <div class="input-group has-validation"> <span class="input-group-text" id="inputGroupPrepend">@</span> <input type="text" class="form-control" id="validationCustomUsername" aria-describedby="inputGroupPrepend" required> <div class="invalid-feedback"> Please choose a username. </div> </div> </div> <div class="col-md-6"> <label for="validationCustom03" class="form-label">City</label> <input type="text" class="form-control" id="validationCustom03" required> <div class="invalid-feedback"> Please provide a valid city. </div> </div> <div class="col-md-3"> <label for="validationCustom04" class="form-label">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 for="validationCustom05" class="form-label">Zip</label> <input type="text" class="form-control" id="validationCustom05" required> <div class="invalid-feedback"> Please provide a valid zip. </div> </div> <div class="col-12"> <div class="form-check d-block"> <input class="form-check-input" type="checkbox" value="" id="invalidCheck" required> <label class="form-check-label ms-0" 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>
Browser defaults
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.
While these feedback styles cannot be styled with CSS, you can still customize the feedback text through JavaScript.
Code Example
<form class="row g-3"> <div class="col-md-4"> <label for="validationDefault01" class="form-label">First name</label> <input type="text" class="form-control" id="validationDefault01" value="Mark" required> </div> <div class="col-md-4"> <label for="validationDefault02" class="form-label">Last name</label> <input type="text" class="form-control" id="validationDefault02" value="Otto" required> </div> <div class="col-md-4"> <label for="validationDefaultUsername" class="form-label">Username</label> <div class="input-group"> <span class="input-group-text" id="inputGroupPrepend2">@</span> <input type="text" class="form-control" id="validationDefaultUsername" aria-describedby="inputGroupPrepend2" required> </div> </div> <div class="col-md-6"> <label for="validationDefault03" class="form-label">City</label> <input type="text" class="form-control" id="validationDefault03" required> </div> <div class="col-md-3"> <label for="validationDefault04" class="form-label">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 for="validationDefault05" class="form-label">Zip</label> <input type="text" class="form-control" id="validationDefault05" required> </div> <div class="col-12"> <div class="form-check align-items-center"> <input class="form-check-input" type="checkbox" value="" id="invalidCheck2" 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>
Tooltips
If your form layout allows it, you can swap the .{valid|invalid}-feedback classes for .{valid|invalid}-tooltip classes to display validation feedback in a styled tooltip. Be sure to have a parent with position: relative on it for tooltip positioning. In the example below, our column classes have this already, but your project may require an alternative setup.
Code Example
<form class="row g-3 form-validate" novalidate> <div class="col-md-4 position-relative"> <label for="validationTooltip01" class="form-label">First name</label> <input type="text" class="form-control" id="validationTooltip01" value="Mark" required> <div class="valid-tooltip"> Looks good! </div> </div> <div class="col-md-4 position-relative"> <label for="validationTooltip02" class="form-label">Last name</label> <input type="text" class="form-control" id="validationTooltip02" value="Otto" required> <div class="valid-tooltip"> Looks good! </div> </div> <div class="col-md-4 position-relative"> <label for="validationTooltipUsername" class="form-label">Username</label> <div class="input-group has-validation"> <span class="input-group-text" id="validationTooltipUsernamePrepend">@</span> <input type="text" class="form-control" id="validationTooltipUsername" 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 for="validationTooltip03" class="form-label">City</label> <input type="text" class="form-control" id="validationTooltip03" required> <div class="invalid-tooltip"> Please provide a valid city. </div> </div> <div class="col-md-3 position-relative"> <label for="validationTooltip04" class="form-label">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 for="validationTooltip05" class="form-label">Zip</label> <input type="text" class="form-control" id="validationTooltip05" 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>