Provide valuable, actionable feedback to your users with HTML5 form validation, via browser default behaviors or custom styles and JavaScript.
For custom Bootstrap form validation messages, you'll need to add the novalidate
boolean attribute to your Form
. 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. Background icons for FormSelect
s are only available with FormSelect
, and not FormControl
.
<template>
<BForm validation>
<Row gutter="3">
<Col col="md-4">
<BFormLabel for="validationCustom01">
First name
</BFormLabel>
<BFormInput
id="validationCustom01"
type="text"
value="Mark"
required
/>
<BValidFeedback valid>
Looks good!
</BValidFeedback>
</Col>
<Col col="md-4">
<BFormLabel for="validationCustom02">
Last name
</BFormLabel>
<BFormInput
id="validationCustom02"
type="text"
value="Otto"
required
/>
<BValidFeedback valid>
Looks good!
</BValidFeedback>
</Col>
<Col col="md-4">
<BFormLabel for="validationCustomUsername">
Username
</BFormLabel>
<BInputGroup>
<BInputGroupText id="BInputGroupPrepend">
@
</BInputGroupText>
<BFormInput
id="validationCustomUsername"
type="text"
aria-describedby="BInputGroupPrepend"
required
/>
<BValidFeedback>Please choose a username.</BValidFeedback>
</BInputGroup>
</Col>
<Col col="md-6">
<BFormLabel for="validationCustom03">
City
</BFormLabel>
<BFormInput
id="validationCustom03"
type="text"
required
/>
<BValidFeedback>Please provide a valid city.</BValidFeedback>
</Col>
<Col col="md-3">
<BFormLabel for="validationCustom04">
State
</BFormLabel>
<BFormSelect required>
<b-option
selected
disabled
value=""
>
Choose...
</b-option>
<b-option>...</b-option>
</BFormSelect>
<BValidFeedback>Please select a valid state.</BValidFeedback>
</Col>
<Col col="md-3">
<BFormLabel for="validationCustom05">
Zip
</BFormLabel>
<BFormInput
id="validationCustom05"
type="text"
required
/>
<BValidFeedback>Please provide a valid zip.</BValidFeedback>
</Col>
<Col col="12">
<BFormCheckInput
id="invalidCheck"
required
/>
<BFormLabel for="invalidCheck">
Agree to terms and conditions
</BFormLabel>
<BValidFeedback>You must agree before submitting.</BValidFeedback>
</Col>
<Col col="12">
<b-button
type="submit"
button="primary"
>
Submit form
</b-button>
</Col>
</Row>
</BForm>
</template>
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.
<template>
<BForm>
<Row gutter="3">
<Col col="md-4">
<BFormLabel for="validationCustom01">
First name
</BFormLabel>
<BFormInput
id="validationCustom01"
type="text"
value="Mark"
required
/>
</Col>
<Col col="md-4">
<BFormLabel for="validationCustom02">
Last name
</BFormLabel>
<BFormInput
id="validationCustom02"
type="text"
value="Otto"
required
/>
</Col>
<Col col="md-4">
<BFormLabel for="validationCustomUsername">
Username
</BFormLabel>
<BInputGroup>
<BInputGroupText id="BInputGroupPrepend">
@
</BInputGroupText>
<BFormInput
id="validationCustomUsername"
type="text"
aria-describedby="BInputGroupPrepend"
required
/>
</BInputGroup>
</Col>
<Col col="md-6">
<BFormLabel for="validationCustom03">
City
</BFormLabel>
<BFormInput
id="validationCustom03"
type="text"
required
/>
</Col>
<Col col="md-3">
<BFormLabel for="validationCustom04">
State
</BFormLabel>
<BFormSelect required>
<b-option
selected
disabled
value=""
>
Choose...
</b-option>
<b-option>...</b-option>
</BFormSelect>
<BValidFeedback>Please select a valid state.</BValidFeedback>
</Col>
<Col col="md-3">
<BFormLabel for="validationCustom05">
Zip
</BFormLabel>
<BFormInput
id="validationCustom05"
type="text"
required
/>
</Col>
<Col col="12">
<BFormCheckInput
id="invalidCheck"
required
/>
<BFormLabel for="invalidCheck">
Agree to terms and conditions
</BFormLabel>
</Col>
<Col col="12">
<b-button
type="submit"
button="primary"
>
Submit form
</b-button>
</Col>
</Row>
</BForm>
</template>
We recommend using client-side validation, but 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.
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).
To fix issues with border radius, input groups require an additional .has-validation
class.
<template>
<BForm>
<Row gutter="3">
<Col col="md-4">
<BFormLabel for="validationCustom01">
First name
</BFormLabel>
<BFormInput
id="validationCustom01"
valid="true"
type="text"
value="Mark"
required
/>
<BValidFeedback valid>
Looks good!
</BValidFeedback>
</Col>
<Col col="md-4">
<BFormLabel for="validationCustom02">
Last name
</BFormLabel>
<BFormInput
id="validationCustom02"
valid="is-valid"
type="text"
value="Otto"
required
/>
<BValidFeedback valid>
Looks good!
</BValidFeedback>
</Col>
<Col col="md-4">
<BFormLabel for="validationCustomUsername">
Username
</BFormLabel>
<BInputGroup>
<BInputGroupText id="BInputGroupPrepend">
@
</BInputGroupText>
<BFormInput
id="validationCustomUsername"
valid="false"
type="text"
aria-describedby="BInputGroupPrepend"
required
/>
<BValidFeedback>Please choose a username.</BValidFeedback>
</BInputGroup>
</Col>
<Col col="md-6">
<BFormLabel for="validationCustom03">
City
</BFormLabel>
<BFormInput
id="validationCustom03"
valid="is-invalid"
type="text"
required
/>
<BValidFeedback>Please provide a valid city.</BValidFeedback>
</Col>
<Col col="md-3">
<BFormLabel for="validationCustom04">
State
</BFormLabel>
<BFormSelect
valid="is-invalid"
required
>
<b-option
selected
disabled
value=""
>
Choose...
</b-option>
<b-option>...</b-option>
</BFormSelect>
<BValidFeedback>Please select a valid state.</BValidFeedback>
</Col>
<Col col="md-3">
<BFormLabel for="validationCustom05">
Zip
</BFormLabel>
<BFormInput
id="validationCustom05"
valid="false"
type="text"
required
/>
<BValidFeedback>Please provide a valid zip.</BValidFeedback>
</Col>
<Col col="12">
<BFormCheckInput
id="invalidCheck"
valid="false"
required
/>
<BFormLabel for="invalidCheck">
Agree to terms and conditions
</BFormLabel>
<BValidFeedback>You must agree before submitting.</BValidFeedback>
</Col>
<Col col="12">
<b-button
type="submit"
button="primary"
>
Submit form
</b-button>
</Col>
</Row>
</BForm>
</template>
Validation styles are available for the following form controls and components:
s and <textarea>
s with .form-control
(including up to one .form-control
in input groups)<Select>
s with .form-select
.form-check
s <template>
<BForm class="was-validated">
<b-div margin="b-3">
<BFormLabel for="validationTextarea">
Textarea
</BFormLabel>
<BFormTextarea
id="validationTextarea"
placeholder="Required example textarea"
required
/>
<BValidFeedback>Please enter a message in the textarea.</BValidFeedback>
</b-div>
<BFormCheck margin="b-3">
<BFormCheckInput required />
<BFormCheckLabel>Default checkbox</BFormCheckLabel>
<BValidFeedback>Example invalid feedback text</BValidFeedback>
</BFormCheck>
<BFormCheck>
<BFormCheckInput
type="radio"
name="radio-stacked"
value="option1"
required
/>
<BFormCheckLabel>Toggle this radio</BFormCheckLabel>
</BFormCheck>
<BFormCheck margin="b-3">
<BFormCheckInput
type="radio"
name="radio-stacked"
value="option2"
required
/>
<BFormLabel>Or toggle this other radio</BFormLabel>
<BValidFeedback>Example invalid feedback text</BValidFeedback>
</BFormCheck>
<b-div margin="b-3">
<BFormSelect required>
<b-option value>
Open this select menu
</b-option>
<b-option value="1">
One
</b-option>
<b-option value="2">
Two
</b-option>
<b-option value="3">
Three
</b-option>
</BFormSelect>
<BValidFeedback>Example invalid select feedback</BValidFeedback>
</b-div>
<b-div margin="b-3">
<BFormFile required />
<BValidFeedback>Example invalid select feedback</BValidFeedback>
</b-div>
<b-div margin="b-3">
<b-button
type="submit"
button="primary"
disabled
>
Submit form
</b-button>
</b-div>
</BForm>
</template>
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.
<template>
<BForm validation>
<Row gutter="3">
<Col
col="md-4"
position="relative"
>
<BFormLabel for="validationCustom01">
First name
</BFormLabel>
<BFormInput
id="validationCustom01"
type="text"
value="Mark"
required
/>
<BValidTooltip valid>
Looks good!
</BValidTooltip>
</Col>
<Col
col="md-4"
position="relative"
>
<BFormLabel for="validationCustom02">
Last name
</BFormLabel>
<BFormInput
id="validationCustom02"
type="text"
value="Otto"
required
/>
<BValidTooltip valid>
Looks good!
</BValidTooltip>
</Col>
<Col
col="md-4"
position="relative"
>
<BFormLabel for="validationCustomUsername">
Username
</BFormLabel>
<BInputGroup>
<BInputGroupText id="BInputGroupPrepend">
@
</BInputGroupText>
<BFormInput
id="validationCustomUsername"
type="text"
aria-describedby="BInputGroupPrepend"
required
/>
<BValidTooltip>Please choose a username.</BValidTooltip>
</BInputGroup>
</Col>
<Col
col="md-6"
position="relative"
>
<BFormLabel for="validationCustom03">
City
</BFormLabel>
<BFormInput
id="validationCustom03"
type="text"
required
/>
<BValidTooltip>Please provide a valid city.</BValidTooltip>
</Col>
<Col
col="md-3"
position="relative"
>
<BFormLabel for="validationCustom04">
State
</BFormLabel>
<BFormSelect required>
<b-option
selected
disabled
value=""
>
Choose...
</b-option>
<b-option>...</b-option>
</BFormSelect>
<BValidTooltip>Please select a valid state.</BValidTooltip>
</Col>
<Col
col="md-3"
position="relative"
>
<BFormLabel for="validationCustom05">
Zip
</BFormLabel>
<BFormInput
id="validationCustom05"
type="text"
required
/>
<BValidTooltip>Please provide a valid zip.</BValidTooltip>
</Col>
<Col col="12">
<BFormCheckInput
id="invalidCheck"
required
/>
<BFormLabel for="invalidCheck">
Agree to terms and conditions
</BFormLabel>
<BValidTooltip>You must agree before submitting.</BValidTooltip>
</Col>
<Col col="12">
<b-button
type="submit"
button="primary"
>
Submit form
</b-button>
</Col>
</Row>
</BForm>
</template>