import { Form, Input, Button, Checkbox } from 'antd';

const layout = {
  labelCol: { span: 8 },
  wrapperCol: { span: 16 },
};
const tailLayout = {
  wrapperCol: { offset: 8, span: 16 },
};

const Demo = () => {
  const onFinish = values => {
    console.log('Success:', values);
  };

  const onFinishFailed = errorInfo => {
    console.log('Failed:', errorInfo);
  };

  return (
    <Form
      {...layout}
      name="basic"
      initialValues={{ remember: true }}
      onFinish={onFinish}
      onFinishFailed={onFinishFailed}
    >
      <Form.Item
        label="Username"
        name="username"
        rules={[{ required: true, message: 'Please input your username!' }]}
      >
        <Input />
      </Form.Item>

      <Form.Item
        label="Password"
        name="password"
        rules={[{ required: true, message: 'Please input your password!' }]}
      >
        <Input.Password />
      </Form.Item>

      <Form.Item {...tailLayout} name="remember" valuePropName="checked">
        <Checkbox>Remember me</Checkbox>
      </Form.Item>

      <Form.Item {...tailLayout}>
        <Button type="primary" htmlType="submit">
          Submit
        </Button>
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<Demo />, mountNode);

import { Form, Input, Button, Select } from 'antd';

const { Option } = Select;

const layout = {
  labelCol: { span: 8 },
  wrapperCol: { span: 16 },
};
const tailLayout = {
  wrapperCol: { offset: 8, span: 16 },
};

const Demo = () => {
  const [form] = Form.useForm();

  const onGenderChange = value => {
    switch (value) {
      case "male":
        form.setFieldsValue({ note: "Hi, man!" });
        return;
      case "female":
        form.setFieldsValue({ note: "Hi, lady!" });
        return;
      case "other":
        form.setFieldsValue({ note: "Hi there!" });
        return;
    }
  };

  const onFinish = values => {
    console.log(values);
  };

  const onReset = () => {
    form.resetFields();
  };

  const onFill = () => {
    form.setFieldsValue({
      note: 'Hello world!',
      gender: 'male',
    });
  };

  return (
    <Form {...layout} form={form} name="control-hooks" onFinish={onFinish}>
      <Form.Item name="note" label="Note" rules={[{ required: true }]}>
        <Input />
      </Form.Item>
      <Form.Item name="gender" label="Gender" rules={[{ required: true }]}>
        <Select
          placeholder="Select a option and change input text above"
          onChange={onGenderChange}
          allowClear
        >
          <Option value="male">male</Option>
          <Option value="female">female</Option>
          <Option value="other">other</Option>
        </Select>
      </Form.Item>
      <Form.Item
        noStyle
        shouldUpdate={(prevValues, currentValues) => prevValues.gender !== currentValues.gender}
      >
        {({ getFieldValue }) => {
          return getFieldValue('gender') === 'other' ? (
            <Form.Item name="customizeGender" label="Customize Gender" rules={[{ required: true }]}>
              <Input />
            </Form.Item>
          ) : null;
        }}
      </Form.Item>
      <Form.Item {...tailLayout}>
        <Button type="primary" htmlType="submit">
          Submit
        </Button>
        <Button htmlType="button" onClick={onReset}>
          Reset
        </Button>
        <Button type="link" htmlType="button" onClick={onFill}>
          Fill form
        </Button>
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<Demo />, mountNode);

import { Form, Input, Button, Select } from 'antd';

const { Option } = Select;

const layout = {
  labelCol: { span: 8 },
  wrapperCol: { span: 16 },
};
const tailLayout = {
  wrapperCol: { offset: 8, span: 16 },
};

class Demo extends React.Component {
  formRef = React.createRef();

  onGenderChange = value => {
    this.formRef.current.setFieldsValue({
      note: `Hi, ${value === 'male' ? 'man' : 'lady'}!`,
    });
  };

  onFinish = values => {
    console.log(values);
  };

  onReset = () => {
    this.formRef.current.resetFields();
  };

  onFill = () => {
    this.formRef.current.setFieldsValue({
      note: 'Hello world!',
      gender: 'male',
    });
  };

  render() {
    return (
      <Form {...layout} ref={this.formRef} name="control-ref" onFinish={this.onFinish}>
        <Form.Item name="note" label="Note" rules={[{ required: true }]}>
          <Input />
        </Form.Item>
        <Form.Item name="gender" label="Gender" rules={[{ required: true }]}>
          <Select
            placeholder="Select a option and change input text above"
            onChange={this.onGenderChange}
            allowClear
          >
            <Option value="male">male</Option>
            <Option value="female">female</Option>
            <Option value="other">other</Option>
          </Select>
        </Form.Item>
        <Form.Item
          noStyle
          shouldUpdate={(prevValues, currentValues) => prevValues.gender !== currentValues.gender}
        >
          {({ getFieldValue }) => {
            return getFieldValue('gender') === 'other' ? (
              <Form.Item
                name="customizeGender"
                label="Customize Gender"
                rules={[{ required: true }]}
              >
                <Input />
              </Form.Item>
            ) : null;
          }}
        </Form.Item>
        <Form.Item {...tailLayout}>
          <Button type="primary" htmlType="submit">
            Submit
          </Button>
          <Button htmlType="button" onClick={this.onReset}>
            Reset
          </Button>
          <Button type="link" htmlType="button" onClick={this.onFill}>
            Fill form
          </Button>
        </Form.Item>
      </Form>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);

import React, { useState } from 'react';
import { Form, Input, Button, Radio } from 'antd';

const FormLayoutDemo = () => {
  const [form] = Form.useForm();
  const [formLayout, setFormLayout] = useState('horizontal');

  const onFormLayoutChange = ({ layout }) => {
    setFormLayout(layout);
  };

  const formItemLayout =
    formLayout === 'horizontal'
      ? {
          labelCol: { span: 4 },
          wrapperCol: { span: 14 },
        }
      : null;

  const buttonItemLayout =
    formLayout === 'horizontal'
      ? {
          wrapperCol: { span: 14, offset: 4 },
        }
      : null;

  return (
    <div>
      <Form
        {...formItemLayout}
        layout={formLayout}
        form={form}
        initialValues={{ layout: formLayout }}
        onValuesChange={onFormLayoutChange}
      >
        <Form.Item label="Form Layout" name="layout">
          <Radio.Group value={formLayout}>
            <Radio.Button value="horizontal">Horizontal</Radio.Button>
            <Radio.Button value="vertical">Vertical</Radio.Button>
            <Radio.Button value="inline">Inline</Radio.Button>
          </Radio.Group>
        </Form.Item>
        <Form.Item label="Field A">
          <Input placeholder="input placeholder" />
        </Form.Item>
        <Form.Item label="Field B">
          <Input placeholder="input placeholder" />
        </Form.Item>
        <Form.Item {...buttonItemLayout}>
          <Button type="primary">Submit</Button>
        </Form.Item>
      </Form>
    </div>
  );
};

ReactDOM.render(<FormLayoutDemo />, mountNode);

import React, { useState } from 'react';
import {
  Form,
  Input,
  Button,
  Radio,
  Select,
  Cascader,
  DatePicker,
  InputNumber,
  TreeSelect,
  Switch,
} from 'antd';
const FormSizeDemo = () => {
  const [componentSize, setComponentSize] = useState('small');
  const onFormLayoutChange = ({ size }) => {
    setComponentSize(size);
  };
  return (
    <div>
      <Form
        labelCol={{ span: 4 }}
        wrapperCol={{ span: 14 }}
        layout="horizontal"
        initialValues={{ size: componentSize }}
        onValuesChange={onFormLayoutChange}
        size={componentSize}
      >
        <Form.Item label="Form Size" name="size">
          <Radio.Group>
            <Radio.Button value="small">Small</Radio.Button>
            <Radio.Button value="middle">Middle</Radio.Button>
            <Radio.Button value="large">Large</Radio.Button>
          </Radio.Group>
        </Form.Item>
        <Form.Item label="Input">
          <Input />
        </Form.Item>
        <Form.Item label="Select">
          <Select>
            <Select.Option value="demo">Demo</Select.Option>
          </Select>
        </Form.Item>
        <Form.Item label="TreeSelect">
          <TreeSelect
            treeData={[
              { title: 'Light', value: 'light', children: [{ title: 'Bamboo', value: 'bamboo' }] },
            ]}
          />
        </Form.Item>
        <Form.Item label="Cascader">
          <Cascader
            options={[
              {
                value: 'zhejiang',
                label: 'Zhejiang',
                children: [
                  {
                    value: 'hangzhou',
                    label: 'Hangzhou',
                  },
                ],
              },
            ]}
          />
        </Form.Item>
        <Form.Item label="DatePicker">
          <DatePicker />
        </Form.Item>
        <Form.Item label="InputNumber">
          <InputNumber />
        </Form.Item>
        <Form.Item label="Switch">
          <Switch />
        </Form.Item>
        <Form.Item label="Button">
          <Button>Button</Button>
        </Form.Item>
      </Form>
    </div>
  );
};
ReactDOM.render(<FormSizeDemo />, mountNode);

import { Form, Input, InputNumber, Button } from 'antd';

const layout = {
  labelCol: { span: 8 },
  wrapperCol: { span: 16 },
};

const validateMessages = {
  required: '${label} is required!',
  types: {
    email: '${label} is not validate email!',
    number: '${label} is not a validate number!',
  },
  number: {
    range: '${label} must be between ${min} and ${max}',
  },
};

const Demo = () => {
  const onFinish = values => {
    console.log(values);
  };

  return (
    <Form {...layout} name="nest-messages" onFinish={onFinish} validateMessages={validateMessages}>
      <Form.Item name={['user', 'name']} label="Name" rules={[{ required: true }]}>
        <Input />
      </Form.Item>
      <Form.Item name={['user', 'email']} label="Email" rules={[{ type: 'email' }]}>
        <Input />
      </Form.Item>
      <Form.Item name={['user', 'age']} label="Age" rules={[{ type: 'number', min: 0, max: 99 }]}>
        <InputNumber />
      </Form.Item>
      <Form.Item name={['user', 'website']} label="Website">
        <Input />
      </Form.Item>
      <Form.Item name={['user', 'introduction']} label="Introduction">
        <Input.TextArea />
      </Form.Item>
      <Form.Item wrapperCol={{ ...layout.wrapperCol, offset: 8 }}>
        <Button type="primary" htmlType="submit">
          Submit
        </Button>
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<Demo />, mountNode);

import React, { useState } from 'react';
import { Form, Input, Select, Button } from 'antd';

const { Option } = Select;

interface PriceValue {
  number?: number;
  currency?: 'rmb' | 'dollar';
}

interface PriceInputProps {
  value?: PriceValue;
  onChange?: (value: PriceValue) => void;
}

const PriceInput: React.FC<PriceInputProps> = ({ value = {}, onChange }) => {
  const [number, setNumber] = useState(0);
  const [currency, setCurrency] = useState('rmb');

  const triggerChange = changedValue => {
    if (onChange) {
      onChange({ number, currency, ...value, ...changedValue });
    }
  };

  const onNumberChange = e => {
    const newNumber = parseInt(e.target.value || 0, 10);
    if (Number.isNaN(number)) {
      return;
    }
    if (!('number' in value)) {
      setNumber(newNumber);
    }
    triggerChange({ number: newNumber });
  };

  const onCurrencyChange = newCurrency => {
    if (!('currency' in value)) {
      setCurrency(newCurrency);
    }
    triggerChange({ currency: newCurrency });
  };

  return (
    <span>
      <Input
        type="text"
        value={value.number || number}
        onChange={onNumberChange}
        style={{ width: 100 }}
      />
      <Select
        value={value.currency || currency}
        style={{ width: 80, margin: '0 8px' }}
        onChange={onCurrencyChange}
      >
        <Option value="rmb">RMB</Option>
        <Option value="dollar">Dollar</Option>
      </Select>
    </span>
  );
};

const Demo = () => {
  const onFinish = values => {
    console.log('Received values from form: ', values);
  };

  const checkPrice = (rule, value) => {
    if (value.number > 0) {
      return Promise.resolve();
    }
    return Promise.reject('Price must be greater than zero!');
  };

  return (
    <Form
      name="customized_form_controls"
      layout="inline"
      onFinish={onFinish}
      initialValues={{
        price: {
          number: 0,
          currency: 'rmb',
        },
      }}
    >
      <Form.Item name="price" label="Price" rules={[{ validator: checkPrice }]}>
        <PriceInput />
      </Form.Item>
      <Form.Item>
        <Button type="primary" htmlType="submit">
          Submit
        </Button>
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<Demo />, mountNode);

import React, { useState } from 'react';
import { Form, Input } from 'antd';

interface FieldData {
  name: string[];
  value: any;
  touched: boolean;
  validating: boolean;
  errors: string[];
}

interface CustomizedFormProps {
  onChange: (fields: FieldData[]) => void;
  fields: FieldData[];
}

const CustomizedForm: React.FC<CustomizedFormProps> = ({ onChange, fields }) => {
  return (
    <Form
      name="global_state"
      layout="inline"
      fields={fields}
      onFieldsChange={(changedFields, allFields) => {
        onChange(allFields);
      }}
    >
      <Form.Item
        name="username"
        label="Username"
        rules={[{ required: true, message: 'Username is required!' }]}
      >
        <Input />
      </Form.Item>
    </Form>
  );
};

const Demo = () => {
  const [fields, setFields] = useState([{ name: ['username'], value: 'Ant Design' }]);

  return (
    <div>
      <CustomizedForm
        fields={fields}
        onChange={newFields => {
          setFields(newFields);
        }}
      />
      <pre className="language-bash">{JSON.stringify(fields, null, 2)}</pre>
    </div>
  );
};

ReactDOM.render(<Demo />, mountNode);

import React, { useState, useEffect, useRef } from 'react';
import { Form, Input, InputNumber, Modal, Button, Avatar, Typography } from 'antd';
import { SmileOutlined, UserOutlined } from '@ant-design/icons';

const layout = {
  labelCol: { span: 8 },
  wrapperCol: { span: 16 },
};
const tailLayout = {
  wrapperCol: { offset: 8, span: 16 },
};

interface ModalFormProps {
  visible: boolean;
  onCancel: () => void;
}

// reset form fields when modal is form, closed
const useResetFormOnCloseModal = ({ form, visible }) => {
  const prevVisibleRef = useRef();
  useEffect(() => {
    prevVisibleRef.current = visible;
  }, [visible]);
  const prevVisible = prevVisibleRef.current;

  useEffect(() => {
    if (!visible && prevVisible) {
      form.resetFields();
    }
  }, [visible]);
};

const ModalForm: React.FC<ModalFormProps> = ({ visible, onCancel }) => {
  const [form] = Form.useForm();

  useResetFormOnCloseModal({
    form,
    visible,
  });

  const onOk = () => {
    form.submit();
  };

  return (
    <Modal title="Basic Drawer" visible={visible} onOk={onOk} onCancel={onCancel}>
      <Form form={form} layout="vertical" name="userForm">
        <Form.Item name="name" label="User Name" rules={[{ required: true }]}>
          <Input />
        </Form.Item>
        <Form.Item name="age" label="User Age" rules={[{ required: true }]}>
          <InputNumber />
        </Form.Item>
      </Form>
    </Modal>
  );
};

const Demo = () => {
  const [visible, setVisible] = useState(false);

  const showUserModal = () => {
    setVisible(true);
  };

  const hideUserModal = () => {
    setVisible(false);
  };

  const onFinish = values => {
    console.log('Finish:', values);
  };

  return (
    <div>
      <Form.Provider
        onFormFinish={(name, { values, forms }) => {
          if (name === 'userForm') {
            const { basicForm } = forms;
            const users = basicForm.getFieldValue('users') || [];
            basicForm.setFieldsValue({ users: [...users, values] });
            setVisible(false);
          }
        }}
      >
        <Form {...layout} name="basicForm" onFinish={onFinish}>
          <Form.Item name="group" label="Group Name" rules={[{ required: true }]}>
            <Input />
          </Form.Item>
          <Form.Item
            label="User List"
            shouldUpdate={(prevValues, curValues) => prevValues.users !== curValues.users}
          >
            {({ getFieldValue }) => {
              const users = getFieldValue('users') || [];
              return users.length ? (
                <ul>
                  {users.map((user, index) => (
                    <li key={index} className="user">
                      <Avatar icon={<UserOutlined />} />
                      {user.name} - {user.age}
                    </li>
                  ))}
                </ul>
              ) : (
                <Typography.Text className="ant-form-text" type="secondary">
                  ( <SmileOutlined /> No user yet. )
                </Typography.Text>
              );
            }}
          </Form.Item>
          <Form.Item {...tailLayout}>
            <Button htmlType="submit" type="primary">
              Submit
            </Button>
            <Button htmlType="button" style={{ margin: '0 8px' }} onClick={showUserModal}>
              Add User
            </Button>
          </Form.Item>
        </Form>

        <ModalForm visible={visible} onCancel={hideUserModal} />
      </Form.Provider>
    </div>
  );
};

ReactDOM.render(<Demo />, mountNode);

import React, { useState, useEffect } from 'react';
import { Form, Input, Button } from 'antd';
import { UserOutlined, LockOutlined } from '@ant-design/icons';

const HorizontalLoginForm = () => {
  const [form] = Form.useForm();
  const [, forceUpdate] = useState();

  // To disable submit button at the beginning.
  useEffect(() => {
    forceUpdate({});
  }, []);

  const onFinish = values => {
    console.log('Finish:', values);
  };

  return (
    <Form form={form} name="horizontal_login" layout="inline" onFinish={onFinish}>
      <Form.Item
        name="username"
        rules={[{ required: true, message: 'Please input your username!' }]}
      >
        <Input prefix={<UserOutlined className="site-form-item-icon" />} placeholder="Username" />
      </Form.Item>
      <Form.Item
        name="password"
        rules={[{ required: true, message: 'Please input your password!' }]}
      >
        <Input
          prefix={<LockOutlined className="site-form-item-icon" />}
          type="password"
          placeholder="Password"
        />
      </Form.Item>
      <Form.Item shouldUpdate={true}>
        {() => (
          <Button
            type="primary"
            htmlType="submit"
            disabled={
              !form.isFieldsTouched(true) ||
              form.getFieldsError().filter(({ errors }) => errors.length).length
            }
          >
            Log in
          </Button>
        )}
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<HorizontalLoginForm />, mountNode);

import { Form, Input, Button, Checkbox } from 'antd';
import { UserOutlined, LockOutlined } from '@ant-design/icons';

const NormalLoginForm = () => {
  const onFinish = values => {
    console.log('Received values of form: ', values);
  };

  return (
    <Form
      name="normal_login"
      className="login-form"
      initialValues={{ remember: true }}
      onFinish={onFinish}
    >
      <Form.Item
        name="username"
        rules={[{ required: true, message: 'Please input your Username!' }]}
      >
        <Input prefix={<UserOutlined className="site-form-item-icon" />} placeholder="Username" />
      </Form.Item>
      <Form.Item
        name="password"
        rules={[{ required: true, message: 'Please input your Password!' }]}
      >
        <Input
          prefix={<LockOutlined className="site-form-item-icon" />}
          type="password"
          placeholder="Password"
        />
      </Form.Item>
      <Form.Item>
        <Form.Item name="remember" valuePropName="checked" noStyle>
          <Checkbox>Remember me</Checkbox>
        </Form.Item>

        <a className="login-form-forgot" href="">
          Forgot password
        </a>
      </Form.Item>

      <Form.Item>
        <Button type="primary" htmlType="submit" className="login-form-button">
          Log in
        </Button>
        Or <a href="">register now!</a>
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<NormalLoginForm />, mountNode);

import React, { useState } from 'react';
import {
  Form,
  Input,
  Tooltip,
  Cascader,
  Select,
  Row,
  Col,
  Checkbox,
  Button,
  AutoComplete,
} from 'antd';
import { QuestionCircleOutlined } from '@ant-design/icons';

const { Option } = Select;
const AutoCompleteOption = AutoComplete.Option;

const residences = [
  {
    value: 'zhejiang',
    label: 'Zhejiang',
    children: [
      {
        value: 'hangzhou',
        label: 'Hangzhou',
        children: [
          {
            value: 'xihu',
            label: 'West Lake',
          },
        ],
      },
    ],
  },
  {
    value: 'jiangsu',
    label: 'Jiangsu',
    children: [
      {
        value: 'nanjing',
        label: 'Nanjing',
        children: [
          {
            value: 'zhonghuamen',
            label: 'Zhong Hua Men',
          },
        ],
      },
    ],
  },
];

const formItemLayout = {
  labelCol: {
    xs: { span: 24 },
    sm: { span: 8 },
  },
  wrapperCol: {
    xs: { span: 24 },
    sm: { span: 16 },
  },
};
const tailFormItemLayout = {
  wrapperCol: {
    xs: {
      span: 24,
      offset: 0,
    },
    sm: {
      span: 16,
      offset: 8,
    },
  },
};

const RegistrationForm = () => {
  const [form] = Form.useForm();

  const onFinish = values => {
    console.log('Received values of form: ', values);
  };

  const prefixSelector = (
    <Form.Item name="prefix" noStyle>
      <Select style={{ width: 70 }}>
        <Option value="86">+86</Option>
        <Option value="87">+87</Option>
      </Select>
    </Form.Item>
  );

  const [autoCompleteResult, setAutoCompleteResult] = useState([]);

  const onWebsiteChange = value => {
    if (!value) {
      setAutoCompleteResult([]);
    } else {
      setAutoCompleteResult(['.com', '.org', '.net'].map(domain => `${value}${domain}`));
    }
  };

  const websiteOptions = autoCompleteResult.map(website => ({
    label: website,
    value: website,
  }));

  return (
    <Form
      {...formItemLayout}
      form={form}
      name="register"
      onFinish={onFinish}
      initialValues={{
        residence: ['zhejiang', 'hangzhou', 'xihu'],
        prefix: '86',
      }}
      scrollToFirstError
    >
      <Form.Item
        name="email"
        label="E-mail"
        rules={[
          {
            type: 'email',
            message: 'The input is not valid E-mail!',
          },
          {
            required: true,
            message: 'Please input your E-mail!',
          },
        ]}
      >
        <Input />
      </Form.Item>

      <Form.Item
        name="password"
        label="Password"
        rules={[
          {
            required: true,
            message: 'Please input your password!',
          },
        ]}
        hasFeedback
      >
        <Input.Password />
      </Form.Item>

      <Form.Item
        name="confirm"
        label="Confirm Password"
        dependencies={['password']}
        hasFeedback
        rules={[
          {
            required: true,
            message: 'Please confirm your password!',
          },
          ({ getFieldValue }) => ({
            validator(rule, value) {
              if (!value || getFieldValue('password') === value) {
                return Promise.resolve();
              }
              return Promise.reject('The two passwords that you entered do not match!');
            },
          }),
        ]}
      >
        <Input.Password />
      </Form.Item>

      <Form.Item
        name="nickname"
        label={
          <span>
            Nickname&nbsp;
            <Tooltip title="What do you want others to call you?">
              <QuestionCircleOutlined />
            </Tooltip>
          </span>
        }
        rules={[{ required: true, message: 'Please input your nickname!', whitespace: true }]}
      >
        <Input />
      </Form.Item>

      <Form.Item
        name="residence"
        label="Habitual Residence"
        rules={[
          { type: 'array', required: true, message: 'Please select your habitual residence!' },
        ]}
      >
        <Cascader options={residences} />
      </Form.Item>

      <Form.Item
        name="phone"
        label="Phone Number"
        rules={[{ required: true, message: 'Please input your phone number!' }]}
      >
        <Input addonBefore={prefixSelector} style={{ width: '100%' }} />
      </Form.Item>

      <Form.Item
        name="website"
        label="Website"
        rules={[{ required: true, message: 'Please input website!' }]}
      >
        <AutoComplete options={websiteOptions} onChange={onWebsiteChange} placeholder="website">
          <Input />
        </AutoComplete>
      </Form.Item>

      <Form.Item label="Captcha" extra="We must make sure that your are a human.">
        <Row gutter={8}>
          <Col span={12}>
            <Form.Item
              name="captcha"
              noStyle
              rules={[{ required: true, message: 'Please input the captcha you got!' }]}
            >
              <Input />
            </Form.Item>
          </Col>
          <Col span={12}>
            <Button>Get captcha</Button>
          </Col>
        </Row>
      </Form.Item>

      <Form.Item
        name="agreement"
        valuePropName="checked"
        rules={[
          { validator:(_, value) => value ? Promise.resolve() : Promise.reject('Should accept agreement') },
        ]}
        {...tailFormItemLayout}
      >
        <Checkbox>
          I have read the <a href="">agreement</a>
        </Checkbox>
      </Form.Item>
      <Form.Item {...tailFormItemLayout}>
        <Button type="primary" htmlType="submit">
          Register
        </Button>
      </Form.Item>
    </Form>
  );
};

ReactDOM.render(<RegistrationForm />, mountNode);