Validation
Provide valuable, actionable feedback to your users with HTML5 form validation, via browser default behaviors or custom styles and JavaScript.
Custom styles
For custom Bootstrap form validation messages, you’ll need to add the novalidate boolean attribute to your form. For server side validation read full documentation.
<template>
<div>
<h1>Custom Style</h1>
<p :style="{ color: 'red' }">This is a red paragraph.</p>
</div>
</template>
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.
<template>
<form class="row g-3" @submit.prevent="">
<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">
<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>
</template>
Server side
In case you require server-side validation, you can indicate invalid and valid form fields with .is-invalid and .is-valid. Note that .invalid-feedback is also supported with these classes.
<template>
<form class="row g-3">
<div class="col-md-4">
<label for="validationServer01" class="form-label">First name</label>
<input type="text" class="form-control is-valid" id="validationServer01" value="Mark" required>
<div class="valid-feedback">
Looks good!
</div>
</div>
<div class="col-md-4">
<label for="validationServer02" class="form-label">Last name</label>
<input type="text" class="form-control is-valid" id="validationServer02" value="Otto" required>
<div class="valid-feedback">
Looks good!
</div>
</div>
<div class="col-md-4">
<label for="validationServerUsername" class="form-label">Username</label>
<div class="input-group has-validation">
<span class="input-group-text" id="inputGroupPrepend3">@</span>
<input type="text" class="form-control is-invalid" id="validationServerUsername" aria-describedby="inputGroupPrepend3 validationServerUsernameFeedback" required>
<div id="validationServerUsernameFeedback" class="invalid-feedback">
Please choose a username.
</div>
</div>
</div>
<div class="col-md-6">
<label for="validationServer03" class="form-label">City</label>
<input type="text" class="form-control is-invalid" id="validationServer03" aria-describedby="validationServer03Feedback" required>
<div id="validationServer03Feedback" class="invalid-feedback">
Please provide a valid city.
</div>
</div>
<div class="col-md-3">
<label for="validationServer04" class="form-label">State</label>
<select class="form-select is-invalid" id="validationServer04" aria-describedby="validationServer04Feedback" required>
<option selected disabled value="">Choose...</option>
<option>...</option>
</select>
<div id="validationServer04Feedback" class="invalid-feedback">
Please select a valid state.
</div>
</div>
<div class="col-md-3">
<label for="validationServer05" class="form-label">Zip</label>
<input type="text" class="form-control is-invalid" id="validationServer05" aria-describedby="validationServer05Feedback" required>
<div id="validationServer05Feedback" class="invalid-feedback">
Please provide a valid zip.
</div>
</div>
<div class="col-12">
<div class="form-check">
<input class="form-check-input is-invalid" type="checkbox" value="" id="invalidCheck3" aria-describedby="invalidCheck3Feedback" required>
<label class="form-check-label" for="invalidCheck3">
Agree to terms and conditions
</label>
<div id="invalidCheck3Feedback" 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>
</template>
Supported elements
Form validation styles are also available for bootstrap custom form controls.
<template>
<form class="was-validated">
<div class="mb-3">
<label for="validationTextarea" class="form-label">Textarea</label>
<textarea class="form-control" 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 type="checkbox" class="form-check-input" id="validationFormCheck1" 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 type="radio" class="form-check-input" id="validationFormCheck2" name="radio-stacked" required>
<label class="form-check-label" for="validationFormCheck2">Toggle this radio</label>
</div>
<div class="form-check mb-3">
<input type="radio" class="form-check-input" id="validationFormCheck3" 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 type="file" class="form-control" 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>
</template>
Tooltips
Swap the .{valid|invalid}-feedback classes for .{valid|invalid}-tooltip classes to display validation feedback in a styled tooltip.
<template>
<form class="row g-3 needs-validation" novalidate="" @submit.prevent="onCustomStyleSubmit">
<div class="col-md-4 position-relative">
<label class="form-label" for="validationTooltip01">First name</label>
<input class="form-control" id="validationTooltip01"
v-bind:class="formSubmitted ? firstError ? 'is-invalid' : 'is-valid' : ''" placeholder="Your name"
v-model="firstname" type="text" required="">
<div class="valid-tooltip" v-if="errors[0]" data-bs-toggle="tooltip" title="Looks good!">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"
v-bind:class="formSubmitted ? lastError ? 'is-invalid' : 'is-valid' : ''" placeholder="Your name"
v-model="lastname" required="">
<div class="valid-tooltip" v-if="errors[0]" data-bs-toggle="tooltip" title="Looks good!">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"
v-bind:class="formSubmitted ? userError ? 'is-invalid' : 'is-valid' : ''" placeholder="Username"
v-model="username" required="">
<div class="invalid-tooltip" v-if="errors[1]" data-bs-toggle="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"
v-bind:class="formSubmitted ? cityError ? 'is-invalid' : 'is-valid' : ''" placeholder="City" required=""
v-model="city">
<div class="invalid-tooltip" v-if="errors[2]" data-bs-toggle="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"
v-bind:class="formSubmitted ? stateError ? 'is-invalid' : 'is-valid' : ''" v-model="state" required="">
<option selected="" disabled="" value="">Choose...</option>
<option>...</option>
</select>
<div class="invalid-tooltip" v-if="errors[3]" data-bs-toggle="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=""
v-bind:class="formSubmitted ? zipError ? 'is-invalid' : 'is-valid' : ''" v-model="zip" placeholder="Zip">
<div class="invalid-tooltip" v-if="errors[4]" data-bs-toggle="tooltip">Please provide a valid zip.</div>
</div>
<div class="col-12">
<button class="btn btn-primary">Submit form</button>
</div>
</form>
</template>
<script>
import formValidation from "@/mixins/form/formValidation.js";
export default {
mixins: [formValidation],
};
</script>