Validation

Provide valuable, actionable feedback to your users with HTML5 form validation, via browser default behaviors or custom styles and JavaScript.

Native HTML5 form validation

For native HTML form validation–available in all our supported browsers, the :valid and :invalid pseudo selectors are used to apply validation styles as well as display feedback messages.

Bootstrap scopes the :valid and :invalid styles to parent .was-validated class, usually applied to the <Form> (you can use the validated prop as a shortcut). Otherwise, any required field without a value shows up as invalid on page load. This way, you may choose when to activate them (typically after form submission is attempted).

Watch out!

Browsers provide their own validation UI by default on forms. You can disable the default UI by adding the HTML noValidate attribute to your <Form> or <form> element.

结果

实时编辑器

import { useState } from 'react';
import Button from 'react-bootstrap/Button';
import Col from 'react-bootstrap/Col';
import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';
import Row from 'react-bootstrap/Row';

function FormExample() {
  const [validated, setValidated] = useState(false);

  const handleSubmit = (event) => {
    const form = event.currentTarget;
    if (form.checkValidity() === false) {
      event.preventDefault();
      event.stopPropagation();
    }

    setValidated(true);
  };

  return (
    <Form noValidate validated={validated} onSubmit={handleSubmit}>
      <Row className="mb-3">
        <Form.Group as={Col} md="4" controlId="validationCustom01">
          <Form.Label>First name</Form.Label>
          <Form.Control
            required
            type="text"
            placeholder="First name"
            defaultValue="Mark"
          />
          <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="4" controlId="validationCustom02">
          <Form.Label>Last name</Form.Label>
          <Form.Control
            required
            type="text"
            placeholder="Last name"
            defaultValue="Otto"
          />
          <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="4" controlId="validationCustomUsername">
          <Form.Label>Username</Form.Label>
          <InputGroup hasValidation>
            <InputGroup.Text id="inputGroupPrepend">@</InputGroup.Text>
            <Form.Control
              type="text"
              placeholder="Username"
              aria-describedby="inputGroupPrepend"
              required
            />
            <Form.Control.Feedback type="invalid">
              Please choose a username.
            </Form.Control.Feedback>
          </InputGroup>
        </Form.Group>
      </Row>
      <Row className="mb-3">
        <Form.Group as={Col} md="6" controlId="validationCustom03">
          <Form.Label>City</Form.Label>
          <Form.Control type="text" placeholder="City" required />
          <Form.Control.Feedback type="invalid">
            Please provide a valid city.
          </Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="3" controlId="validationCustom04">
          <Form.Label>State</Form.Label>
          <Form.Control type="text" placeholder="State" required />
          <Form.Control.Feedback type="invalid">
            Please provide a valid state.
          </Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="3" controlId="validationCustom05">
          <Form.Label>Zip</Form.Label>
          <Form.Control type="text" placeholder="Zip" required />
          <Form.Control.Feedback type="invalid">
            Please provide a valid zip.
          </Form.Control.Feedback>
        </Form.Group>
      </Row>
      <Form.Group className="mb-3">
        <Form.Check
          required
          label="Agree to terms and conditions"
          feedback="You must agree before submitting."
          feedbackType="invalid"
        />
      </Form.Group>
      <Button type="submit">Submit form</Button>
    </Form>
  );
}

export default FormExample;

import { useState } from 'react';
import Button from 'react-bootstrap/Button';
import Col from 'react-bootstrap/Col';
import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';
import Row from 'react-bootstrap/Row';

function FormExample() {
  const [validated, setValidated] = useState(false);

  const handleSubmit = (event) => {
    const form = event.currentTarget;
    if (form.checkValidity() === false) {
      event.preventDefault();
      event.stopPropagation();
    }

    setValidated(true);
  };

  return (
    <Form noValidate validated={validated} onSubmit={handleSubmit}>
      <Row className="mb-3">
        <Form.Group as={Col} md="4" controlId="validationCustom01">
          <Form.Label>First name</Form.Label>
          <Form.Control
            required
            type="text"
            placeholder="First name"
            defaultValue="Mark"
          />
          <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="4" controlId="validationCustom02">
          <Form.Label>Last name</Form.Label>
          <Form.Control
            required
            type="text"
            placeholder="Last name"
            defaultValue="Otto"
          />
          <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="4" controlId="validationCustomUsername">
          <Form.Label>Username</Form.Label>
          <InputGroup hasValidation>
            <InputGroup.Text id="inputGroupPrepend">@</InputGroup.Text>
            <Form.Control
              type="text"
              placeholder="Username"
              aria-describedby="inputGroupPrepend"
              required
            />
            <Form.Control.Feedback type="invalid">
              Please choose a username.
            </Form.Control.Feedback>
          </InputGroup>
        </Form.Group>
      </Row>
      <Row className="mb-3">
        <Form.Group as={Col} md="6" controlId="validationCustom03">
          <Form.Label>City</Form.Label>
          <Form.Control type="text" placeholder="City" required />
          <Form.Control.Feedback type="invalid">
            Please provide a valid city.
          </Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="3" controlId="validationCustom04">
          <Form.Label>State</Form.Label>
          <Form.Control type="text" placeholder="State" required />
          <Form.Control.Feedback type="invalid">
            Please provide a valid state.
          </Form.Control.Feedback>
        </Form.Group>
        <Form.Group as={Col} md="3" controlId="validationCustom05">
          <Form.Label>Zip</Form.Label>
          <Form.Control type="text" placeholder="Zip" required />
          <Form.Control.Feedback type="invalid">
            Please provide a valid zip.
          </Form.Control.Feedback>
        </Form.Group>
      </Row>
      <Form.Group className="mb-3">
        <Form.Check
          required
          label="Agree to terms and conditions"
          feedback="You must agree before submitting."
          feedbackType="invalid"
        />
      </Form.Group>
      <Button type="submit">Submit form</Button>
    </Form>
  );
}

export default FormExample;

Form libraries and server-rendered styles

It's often beneficial (especially in React) to handle form validation via a library like Formik, or react-formal. In those cases, isValid and isInvalid props can be added to form controls to manually apply validation styles. Below is a quick example integrating with Formik.

结果

实时编辑器

import Button from 'react-bootstrap/Button';
import Col from 'react-bootstrap/Col';
import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';
import Row from 'react-bootstrap/Row';
import * as formik from 'formik';
import * as yup from 'yup';

function FormExample() {
  const { Formik } = formik;

  const schema = yup.object().shape({
    firstName: yup.string().required(),
    lastName: yup.string().required(),
    username: yup.string().required(),
    city: yup.string().required(),
    state: yup.string().required(),
    zip: yup.string().required(),
    terms: yup.bool().required().oneOf([true], 'Terms must be accepted'),
  });

  return (
    <Formik
      validationSchema={schema}
      onSubmit={console.log}
      initialValues={{
        firstName: 'Mark',
        lastName: 'Otto',
        username: '',
        city: '',
        state: '',
        zip: '',
        terms: false,
      }}
    >
      {({ handleSubmit, handleChange, values, touched, errors }) => (
        <Form noValidate onSubmit={handleSubmit}>
          <Row className="mb-3">
            <Form.Group as={Col} md="4" controlId="validationFormik01">
              <Form.Label>First name</Form.Label>
              <Form.Control
                type="text"
                name="firstName"
                value={values.firstName}
                onChange={handleChange}
                isValid={touched.firstName && !errors.firstName}
              />
              <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="4" controlId="validationFormik02">
              <Form.Label>Last name</Form.Label>
              <Form.Control
                type="text"
                name="lastName"
                value={values.lastName}
                onChange={handleChange}
                isValid={touched.lastName && !errors.lastName}
              />

              <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="4" controlId="validationFormikUsername">
              <Form.Label>Username</Form.Label>
              <InputGroup hasValidation>
                <InputGroup.Text id="inputGroupPrepend">@</InputGroup.Text>
                <Form.Control
                  type="text"
                  placeholder="Username"
                  aria-describedby="inputGroupPrepend"
                  name="username"
                  value={values.username}
                  onChange={handleChange}
                  isInvalid={!!errors.username}
                />
                <Form.Control.Feedback type="invalid">
                  {errors.username}
                </Form.Control.Feedback>
              </InputGroup>
            </Form.Group>
          </Row>
          <Row className="mb-3">
            <Form.Group as={Col} md="6" controlId="validationFormik03">
              <Form.Label>City</Form.Label>
              <Form.Control
                type="text"
                placeholder="City"
                name="city"
                value={values.city}
                onChange={handleChange}
                isInvalid={!!errors.city}
              />

              <Form.Control.Feedback type="invalid">
                {errors.city}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="3" controlId="validationFormik04">
              <Form.Label>State</Form.Label>
              <Form.Control
                type="text"
                placeholder="State"
                name="state"
                value={values.state}
                onChange={handleChange}
                isInvalid={!!errors.state}
              />
              <Form.Control.Feedback type="invalid">
                {errors.state}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="3" controlId="validationFormik05">
              <Form.Label>Zip</Form.Label>
              <Form.Control
                type="text"
                placeholder="Zip"
                name="zip"
                value={values.zip}
                onChange={handleChange}
                isInvalid={!!errors.zip}
              />

              <Form.Control.Feedback type="invalid">
                {errors.zip}
              </Form.Control.Feedback>
            </Form.Group>
          </Row>
          <Form.Group className="mb-3">
            <Form.Check
              required
              name="terms"
              label="Agree to terms and conditions"
              onChange={handleChange}
              isInvalid={!!errors.terms}
              feedback={errors.terms}
              feedbackType="invalid"
              id="validationFormik0"
            />
          </Form.Group>
          <Button type="submit">Submit form</Button>
        </Form>
      )}
    </Formik>
  );
}

export default FormExample;

import Button from 'react-bootstrap/Button';
import Col from 'react-bootstrap/Col';
import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';
import Row from 'react-bootstrap/Row';
import * as formik from 'formik';
import * as yup from 'yup';

function FormExample() {
  const { Formik } = formik;

  const schema = yup.object().shape({
    firstName: yup.string().required(),
    lastName: yup.string().required(),
    username: yup.string().required(),
    city: yup.string().required(),
    state: yup.string().required(),
    zip: yup.string().required(),
    terms: yup.bool().required().oneOf([true], 'Terms must be accepted'),
  });

  return (
    <Formik
      validationSchema={schema}
      onSubmit={console.log}
      initialValues={{
        firstName: 'Mark',
        lastName: 'Otto',
        username: '',
        city: '',
        state: '',
        zip: '',
        terms: false,
      }}
    >
      {({ handleSubmit, handleChange, values, touched, errors }) => (
        <Form noValidate onSubmit={handleSubmit}>
          <Row className="mb-3">
            <Form.Group as={Col} md="4" controlId="validationFormik01">
              <Form.Label>First name</Form.Label>
              <Form.Control
                type="text"
                name="firstName"
                value={values.firstName}
                onChange={handleChange}
                isValid={touched.firstName && !errors.firstName}
              />
              <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="4" controlId="validationFormik02">
              <Form.Label>Last name</Form.Label>
              <Form.Control
                type="text"
                name="lastName"
                value={values.lastName}
                onChange={handleChange}
                isValid={touched.lastName && !errors.lastName}
              />

              <Form.Control.Feedback>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="4" controlId="validationFormikUsername">
              <Form.Label>Username</Form.Label>
              <InputGroup hasValidation>
                <InputGroup.Text id="inputGroupPrepend">@</InputGroup.Text>
                <Form.Control
                  type="text"
                  placeholder="Username"
                  aria-describedby="inputGroupPrepend"
                  name="username"
                  value={values.username}
                  onChange={handleChange}
                  isInvalid={!!errors.username}
                />
                <Form.Control.Feedback type="invalid">
                  {errors.username}
                </Form.Control.Feedback>
              </InputGroup>
            </Form.Group>
          </Row>
          <Row className="mb-3">
            <Form.Group as={Col} md="6" controlId="validationFormik03">
              <Form.Label>City</Form.Label>
              <Form.Control
                type="text"
                placeholder="City"
                name="city"
                value={values.city}
                onChange={handleChange}
                isInvalid={!!errors.city}
              />

              <Form.Control.Feedback type="invalid">
                {errors.city}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="3" controlId="validationFormik04">
              <Form.Label>State</Form.Label>
              <Form.Control
                type="text"
                placeholder="State"
                name="state"
                value={values.state}
                onChange={handleChange}
                isInvalid={!!errors.state}
              />
              <Form.Control.Feedback type="invalid">
                {errors.state}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="3" controlId="validationFormik05">
              <Form.Label>Zip</Form.Label>
              <Form.Control
                type="text"
                placeholder="Zip"
                name="zip"
                value={values.zip}
                onChange={handleChange}
                isInvalid={!!errors.zip}
              />

              <Form.Control.Feedback type="invalid">
                {errors.zip}
              </Form.Control.Feedback>
            </Form.Group>
          </Row>
          <Form.Group className="mb-3">
            <Form.Check
              required
              name="terms"
              label="Agree to terms and conditions"
              onChange={handleChange}
              isInvalid={!!errors.terms}
              feedback={errors.terms}
              feedbackType="invalid"
              id="validationFormik0"
            />
          </Form.Group>
          <Button type="submit">Submit form</Button>
        </Form>
      )}
    </Formik>
  );
}

export default FormExample;

Tooltips

If your form layout allows it, you can use the tooltip prop 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.

结果

实时编辑器

import Button from 'react-bootstrap/Button';
import Col from 'react-bootstrap/Col';
import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';
import Row from 'react-bootstrap/Row';
import * as formik from 'formik';
import * as yup from 'yup';

function FormExample() {
  const { Formik } = formik;

  const schema = yup.object().shape({
    firstName: yup.string().required(),
    lastName: yup.string().required(),
    username: yup.string().required(),
    city: yup.string().required(),
    state: yup.string().required(),
    zip: yup.string().required(),
    file: yup.mixed().required(),
    terms: yup.bool().required().oneOf([true], 'terms must be accepted'),
  });

  return (
    <Formik
      validationSchema={schema}
      onSubmit={console.log}
      initialValues={{
        firstName: 'Mark',
        lastName: 'Otto',
        username: '',
        city: '',
        state: '',
        zip: '',
        file: null,
        terms: false,
      }}
    >
      {({ handleSubmit, handleChange, values, touched, errors }) => (
        <Form noValidate onSubmit={handleSubmit}>
          <Row className="mb-3">
            <Form.Group
              as={Col}
              md="4"
              controlId="validationFormik101"
              className="position-relative"
            >
              <Form.Label>First name</Form.Label>
              <Form.Control
                type="text"
                name="firstName"
                value={values.firstName}
                onChange={handleChange}
                isValid={touched.firstName && !errors.firstName}
              />
              <Form.Control.Feedback tooltip>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group
              as={Col}
              md="4"
              controlId="validationFormik102"
              className="position-relative"
            >
              <Form.Label>Last name</Form.Label>
              <Form.Control
                type="text"
                name="lastName"
                value={values.lastName}
                onChange={handleChange}
                isValid={touched.lastName && !errors.lastName}
              />

              <Form.Control.Feedback tooltip>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="4" controlId="validationFormikUsername2">
              <Form.Label>Username</Form.Label>
              <InputGroup hasValidation>
                <InputGroup.Text id="inputGroupPrepend">@</InputGroup.Text>
                <Form.Control
                  type="text"
                  placeholder="Username"
                  aria-describedby="inputGroupPrepend"
                  name="username"
                  value={values.username}
                  onChange={handleChange}
                  isInvalid={!!errors.username}
                />
                <Form.Control.Feedback type="invalid" tooltip>
                  {errors.username}
                </Form.Control.Feedback>
              </InputGroup>
            </Form.Group>
          </Row>
          <Row className="mb-3">
            <Form.Group
              as={Col}
              md="6"
              controlId="validationFormik103"
              className="position-relative"
            >
              <Form.Label>City</Form.Label>
              <Form.Control
                type="text"
                placeholder="City"
                name="city"
                value={values.city}
                onChange={handleChange}
                isInvalid={!!errors.city}
              />

              <Form.Control.Feedback type="invalid" tooltip>
                {errors.city}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group
              as={Col}
              md="3"
              controlId="validationFormik104"
              className="position-relative"
            >
              <Form.Label>State</Form.Label>
              <Form.Control
                type="text"
                placeholder="State"
                name="state"
                value={values.state}
                onChange={handleChange}
                isInvalid={!!errors.state}
              />
              <Form.Control.Feedback type="invalid" tooltip>
                {errors.state}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group
              as={Col}
              md="3"
              controlId="validationFormik105"
              className="position-relative"
            >
              <Form.Label>Zip</Form.Label>
              <Form.Control
                type="text"
                placeholder="Zip"
                name="zip"
                value={values.zip}
                onChange={handleChange}
                isInvalid={!!errors.zip}
              />

              <Form.Control.Feedback type="invalid" tooltip>
                {errors.zip}
              </Form.Control.Feedback>
            </Form.Group>
          </Row>
          <Form.Group className="position-relative mb-3">
            <Form.Label>File</Form.Label>
            <Form.Control
              type="file"
              required
              name="file"
              onChange={handleChange}
              isInvalid={!!errors.file}
            />
            <Form.Control.Feedback type="invalid" tooltip>
              {errors.file}
            </Form.Control.Feedback>
          </Form.Group>
          <Form.Group className="position-relative mb-3">
            <Form.Check
              required
              name="terms"
              label="Agree to terms and conditions"
              onChange={handleChange}
              isInvalid={!!errors.terms}
              feedback={errors.terms}
              feedbackType="invalid"
              id="validationFormik106"
              feedbackTooltip
            />
          </Form.Group>
          <Button type="submit">Submit form</Button>
        </Form>
      )}
    </Formik>
  );
}

export default FormExample;

import Button from 'react-bootstrap/Button';
import Col from 'react-bootstrap/Col';
import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';
import Row from 'react-bootstrap/Row';
import * as formik from 'formik';
import * as yup from 'yup';

function FormExample() {
  const { Formik } = formik;

  const schema = yup.object().shape({
    firstName: yup.string().required(),
    lastName: yup.string().required(),
    username: yup.string().required(),
    city: yup.string().required(),
    state: yup.string().required(),
    zip: yup.string().required(),
    file: yup.mixed().required(),
    terms: yup.bool().required().oneOf([true], 'terms must be accepted'),
  });

  return (
    <Formik
      validationSchema={schema}
      onSubmit={console.log}
      initialValues={{
        firstName: 'Mark',
        lastName: 'Otto',
        username: '',
        city: '',
        state: '',
        zip: '',
        file: null,
        terms: false,
      }}
    >
      {({ handleSubmit, handleChange, values, touched, errors }) => (
        <Form noValidate onSubmit={handleSubmit}>
          <Row className="mb-3">
            <Form.Group
              as={Col}
              md="4"
              controlId="validationFormik101"
              className="position-relative"
            >
              <Form.Label>First name</Form.Label>
              <Form.Control
                type="text"
                name="firstName"
                value={values.firstName}
                onChange={handleChange}
                isValid={touched.firstName && !errors.firstName}
              />
              <Form.Control.Feedback tooltip>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group
              as={Col}
              md="4"
              controlId="validationFormik102"
              className="position-relative"
            >
              <Form.Label>Last name</Form.Label>
              <Form.Control
                type="text"
                name="lastName"
                value={values.lastName}
                onChange={handleChange}
                isValid={touched.lastName && !errors.lastName}
              />

              <Form.Control.Feedback tooltip>Looks good!</Form.Control.Feedback>
            </Form.Group>
            <Form.Group as={Col} md="4" controlId="validationFormikUsername2">
              <Form.Label>Username</Form.Label>
              <InputGroup hasValidation>
                <InputGroup.Text id="inputGroupPrepend">@</InputGroup.Text>
                <Form.Control
                  type="text"
                  placeholder="Username"
                  aria-describedby="inputGroupPrepend"
                  name="username"
                  value={values.username}
                  onChange={handleChange}
                  isInvalid={!!errors.username}
                />
                <Form.Control.Feedback type="invalid" tooltip>
                  {errors.username}
                </Form.Control.Feedback>
              </InputGroup>
            </Form.Group>
          </Row>
          <Row className="mb-3">
            <Form.Group
              as={Col}
              md="6"
              controlId="validationFormik103"
              className="position-relative"
            >
              <Form.Label>City</Form.Label>
              <Form.Control
                type="text"
                placeholder="City"
                name="city"
                value={values.city}
                onChange={handleChange}
                isInvalid={!!errors.city}
              />

              <Form.Control.Feedback type="invalid" tooltip>
                {errors.city}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group
              as={Col}
              md="3"
              controlId="validationFormik104"
              className="position-relative"
            >
              <Form.Label>State</Form.Label>
              <Form.Control
                type="text"
                placeholder="State"
                name="state"
                value={values.state}
                onChange={handleChange}
                isInvalid={!!errors.state}
              />
              <Form.Control.Feedback type="invalid" tooltip>
                {errors.state}
              </Form.Control.Feedback>
            </Form.Group>
            <Form.Group
              as={Col}
              md="3"
              controlId="validationFormik105"
              className="position-relative"
            >
              <Form.Label>Zip</Form.Label>
              <Form.Control
                type="text"
                placeholder="Zip"
                name="zip"
                value={values.zip}
                onChange={handleChange}
                isInvalid={!!errors.zip}
              />

              <Form.Control.Feedback type="invalid" tooltip>
                {errors.zip}
              </Form.Control.Feedback>
            </Form.Group>
          </Row>
          <Form.Group className="position-relative mb-3">
            <Form.Label>File</Form.Label>
            <Form.Control
              type="file"
              required
              name="file"
              onChange={handleChange}
              isInvalid={!!errors.file}
            />
            <Form.Control.Feedback type="invalid" tooltip>
              {errors.file}
            </Form.Control.Feedback>
          </Form.Group>
          <Form.Group className="position-relative mb-3">
            <Form.Check
              required
              name="terms"
              label="Agree to terms and conditions"
              onChange={handleChange}
              isInvalid={!!errors.terms}
              feedback={errors.terms}
              feedbackType="invalid"
              id="validationFormik106"
              feedbackTooltip
            />
          </Form.Group>
          <Button type="submit">Submit form</Button>
        </Form>
      )}
    </Formik>
  );
}

export default FormExample;

Input group validation

To properly show rounded corners in an <InputGroup> with validation, the <InputGroup> requires the hasValidation prop.

结果

实时编辑器

import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';

function ValidationInputGroupExample() {
  return (
    <InputGroup hasValidation>
      <InputGroup.Text>@</InputGroup.Text>
      <Form.Control type="text" required isInvalid />
      <Form.Control.Feedback type="invalid">
        Please choose a username.
      </Form.Control.Feedback>
    </InputGroup>
  );
}

export default ValidationInputGroupExample;

import Form from 'react-bootstrap/Form';
import InputGroup from 'react-bootstrap/InputGroup';

function ValidationInputGroupExample() {
  return (
    <InputGroup hasValidation>
      <InputGroup.Text>@</InputGroup.Text>
      <Form.Control type="text" required isInvalid />
      <Form.Control.Feedback type="invalid">
        Please choose a username.
      </Form.Control.Feedback>
    </InputGroup>
  );
}

export default ValidationInputGroupExample;

Native HTML5 form validation​

Form libraries and server-rendered styles​

Tooltips​

Input group validation​

API​

Feedback​

Native HTML5 form validation

Form libraries and server-rendered styles

Tooltips

Input group validation

API

Feedback