Bootstrap Vue Form Validation
Provide valuable, actionable feedback to your users with HTML5 form validation, via browser default behaviors or custom styles and JavaScript.
On this page
Custom styles
For custom Bootstrap Vue form validation messages, you'll need to add the novalidation boolean property to your <CForm>. 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 :invalid and :valid styles applied to your form controls.
Custom feedback styles apply custom colors, borders, focus styles, and background icons to better communicate feedback.
<CForm class="row g-3 needs-validation" novalidation :validated="validatedCustom01" @submit="handleSubmitCustom01">
<CCol md="4">
<CFormLabel for="validationCustom01">Email</CFormLabel>
<CFormInput id="validationCustom01" value="Mark" required/>
<CFormFeedback valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4">
<CFormLabel for="validationCustom02">Email</CFormLabel>
<CFormInput id="validationCustom02" value="Otto" required/>
<CFormFeedback valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4">
<CFormLabel for="validationCustomUsername">Username</CFormLabel>
<CInputGroup class="has-validation">
<CInputGroupText id="inputGroupPrepend">@</CInputGroupText>
<CFormInput id="validationCustomUsername" value="" aria-describedby="inputGroupPrepend" required/>
<CFormFeedback invalid>
Please choose a username.
</CFormFeedback>
</CInputGroup>
</CCol>
<CCol md="6">
<CFormLabel for="validationCustom03">City</CFormLabel>
<CFormInput id="validationCustom03" required/>
<CFormFeedback invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3">
<CFormLabel for="validationCustom04">City</CFormLabel>
<CFormSelect id="validationCustom04">
<option disabled>Choose...</option>
<option>...</option>
</CFormSelect>
<CFormFeedback invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3">
<CFormLabel for="validationCustom05">City</CFormLabel>
<CFormInput id="validationCustom05" required/>
<CFormFeedback invalid>
Please provide a valid zip.
</CFormFeedback>
</CCol>
<CCol xs="12">
<CFormCheck type="checkbox" id="invalidCheck" label="Agree to terms and conditions" required/>
<CFormFeedback invalid>
You must agree before submitting.
</CFormFeedback>
</CCol>
<CCol xs="12">
<CButton color="primary" type="submit">Submit form</CButton>
</CCol>
</CForm>
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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.
<CForm class="row g-3 needs-validation" :validated="validatedDefault01" @submit="handleSubmitDefault01">
<CCol md="4">
<CFormLabel for="validationDefault01">Email</CFormLabel>
<CFormInput id="validationDefault01" value="Mark" required/>
<CFormFeedback valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4">
<CFormLabel for="validationDefault02">Email</CFormLabel>
<CFormInput id="validationDefault02" value="Otto" required/>
<CFormFeedback valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4">
<CFormLabel for="validationDefaultUsername">Username</CFormLabel>
<CInputGroup class="has-validation">
<CInputGroupText id="inputGroupPrepend02">@</CInputGroupText>
<CFormInput id="validationDefaultUsername" value="" aria-describedby="inputGroupPrepend02" required/>
<CFormFeedback invalid>
Please choose a username.
</CFormFeedback>
</CInputGroup>
</CCol>
<CCol md="6">
<CFormLabel for="validationDefault03">City</CFormLabel>
<CFormInput id="validationDefault03" required/>
<CFormFeedback invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3">
<CFormLabel for="validationDefault04">City</CFormLabel>
<CFormSelect id="validationDefault04">
<option disabled>Choose...</option>
<option>...</option>
</CFormSelect>
<CFormFeedback invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3">
<CFormLabel for="validationDefault05">City</CFormLabel>
<CFormInput id="validationDefault05" required/>
<CFormFeedback invalid>
Please provide a valid zip.
</CFormFeedback>
</CCol>
<CCol xs="12">
<CFormCheck type="checkbox" id="invalidCheck" label="Agree to terms and conditions" required/>
<CFormFeedback invalid>
You must agree before submitting.
</CFormFeedback>
</CCol>
<CCol xs="12">
<CButton color="primary" type="submit">Submit form</CButton>
</CCol>
</CForm>
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Server side
We recommend using client-side validation, but in case you require server-side validation, you can indicate invalid and valid form fields with invalid and valid boolean properties.
For invalid fields, ensure that the invalid feedback/error message is associated with the relevant form field using aria-describedby (noting that this attribute allows more than one id to be referenced, in case the field already points to additional form text).
<CForm class="row g-3 needs-validation">
<CCol md="4">
<CFormLabel for="validationServer01">Email</CFormLabel>
<CFormInput id="validationServer01" value="Mark" valid required/>
<CFormFeedback valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4">
<CFormLabel for="validationServer02">Email</CFormLabel>
<CFormInput id="validationServer02" value="Otto" valid required/>
<CFormFeedback valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4">
<CFormLabel for="validationServerUsername">Username</CFormLabel>
<CInputGroup class="has-validation">
<CInputGroupText id="inputGroupPrepend03">@</CInputGroupText>
<CFormInput id="validationServerUsername" value="" aria-describedby="inputGroupPrepend03" invalid required/>
<CFormFeedback invalid>
Please choose a username.
</CFormFeedback>
</CInputGroup>
</CCol>
<CCol md="6">
<CFormLabel for="validationServer03">City</CFormLabel>
<CFormInput id="validationServer03" invalid required/>
<CFormFeedback invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3">
<CFormLabel for="validationServer04">City</CFormLabel>
<CFormSelect id="validationServer04" invalid>
<option disabled>Choose...</option>
<option>...</option>
</CFormSelect>
<CFormFeedback invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3">
<CFormLabel for="validationServer05">City</CFormLabel>
<CFormInput id="validationServer05" invalid required/>
<CFormFeedback invalid>
Please provide a valid zip.
</CFormFeedback>
</CCol>
<CCol xs="12">
<CFormCheck type="checkbox" id="invalidCheck" label="Agree to terms and conditions" invalid required/>
<CFormFeedback invalid>
You must agree before submitting.
</CFormFeedback>
</CCol>
<CCol xs="12">
<CButton color="primary" type="submit">Submit form</CButton>
</CCol>
</CForm>
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Supported elements
Validation styles are available for the following form controls and components:
<CFormCheck>s<CFormInput>s<CFormSelect>s<CFormTextarea>s
<CForm :validated="true">
<div class="mb-3">
<CFormLabel for="validationTextarea" class="form-label">Textarea</CFormLabel>
<CFormTextarea id="validationTextarea" placeholder="Required example textarea" invalid required></CFormTextarea>
<CFormFeedback invalid>
Please enter a message in the textarea.
</CFormFeedback>
</div>
<CFormCheck class="mb-3" id="validationFormCheck1" label="Check this checkbox" required/>
<CFormFeedback invalid>Example invalid feedback text</CFormFeedback>
<CFormCheck type="radio" name="radio-stacked" id="validationFormCheck2" label="Check this checkbox" required/>
<CFormCheck class="mb-3" type="radio" name="radio-stacked" id="validationFormCheck3" label="Or toggle this other radio" required/>
<CFormFeedback invalid>More example invalid feedback text</CFormFeedback>
<div class="mb-3">
<CFormSelect required aria-label="select example">
<option>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</CFormSelect>
<CFormFeedback invalid>Example invalid select feedback</CFormFeedback>
</div>
<div class="mb-3">
<CFormInput type="file" id="validationTextarea" aria-label="file example" required />
<CFormFeedback invalid>Example invalid form file feedback</CFormFeedback>
</div>
<div class="mb-3">
<CButton type="submit" color="primary" disabled>Submit form</CButton>
</div>
</CForm>
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Tooltips
If your form layout allows it, you can swap the text for the tooltip 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.
<CForm class="row g-3 needs-validation" novalidation :validated="validatedTooltip01" @submit="handleSubmitTooltip01">
<CCol md="4" class="position-relative">
<CFormLabel for="validationTooltip01">Email</CFormLabel>
<CFormInput id="validationTooltip01" value="Mark" required/>
<CFormFeedback tooltip valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4" class="position-relative">
<CFormLabel for="validationTooltip02">Email</CFormLabel>
<CFormInput id="validationTooltip02" value="Otto" required/>
<CFormFeedback tooltip valid>
Looks good!
</CFormFeedback>
</CCol>
<CCol md="4" class="position-relative">
<CFormLabel for="validationTooltipUsername">Username</CFormLabel>
<CInputGroup class="has-validation">
<CInputGroupText id="inputGroupPrepend">@</CInputGroupText>
<CFormInput id="validationTooltipUsername" value="" aria-describedby="inputGroupPrepend" required/>
<CFormFeedback tooltip invalid>
Please choose a username.
</CFormFeedback>
</CInputGroup>
</CCol>
<CCol md="6" class="position-relative">
<CFormLabel for="validationTooltip03">City</CFormLabel>
<CFormInput id="validationTooltip03" required/>
<CFormFeedback tooltip invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3" class="position-relative">
<CFormLabel for="validationTooltip04">City</CFormLabel>
<CFormSelect id="validationTooltip04" required>
<option disabled value="">Choose...</option>
<option>...</option>
</CFormSelect>
<CFormFeedback tooltip invalid>
Please provide a valid city.
</CFormFeedback>
</CCol>
<CCol md="3" class="position-relative">
<CFormLabel for="validationTooltip05">City</CFormLabel>
<CFormInput id="validationTooltip05" required/>
<CFormFeedback tooltip invalid>
Please provide a valid zip.
</CFormFeedback>
</CCol>
<CCol xs="12" class="position-relative">
<CButton color="primary" type="submit">Submit form</CButton>
</CCol>
</CForm>
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