ant-design/docs/react/faq.en-US.md

group	order	title
title Other	2	FAQ

Here are the frequently asked questions about Ant Design and antd that you should look up before you ask in the community or create a new issue. We also maintain a FAQ issues label for common github issues.

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Is there a difference between undefined and null in the controlled components of antd?

Yes. antd will treat undefined as uncontrolled but null as controlled component which means empty value of it.

As input element, React treats both undefined and null as uncontrolled. When the value is converted from a valid value to undefined or null, the component is no longer controlled, which causes some unexpected cases.

But in antd, undefined is treated as uncontrolled, and null is used as an explicit empty value of controlled components. To deal with some cases (e.g. allowClear) like clearing the value when the value is non-primitive. If you need a component controlled with the value valid, just set the value as null.

Note: For options in Select-like components, it is strongly recommended not to use undefined and null as value in option. Please use string | number as a valid value in option.

Can I use internal API which is not documented on the site?

NOT RECOMMENDED. Internal API is not guaranteed to be compatible with future versions. It may be removed or changed in some versions. If you really need to use it, you should make sure these APIs are still valid when upgrading to a new version or just lock version for usage.

Why API request should be strict discussion?

We are cautious when adding APIs because some APIs may not be abstract enough to become historical debt. For example, when there is a need to change the way of interaction, these poor abstractions may cause breaking changes. To avoid such problems, we recommend that new features be implemented through HOCs first.

Select Dropdown DatePicker TimePicker Popover Popconfirm disappears when I click another popup component inside it. How do I resolve this?

This is an old bug that has been fixed since v3.11.x. If you're using an older version, you can use <Select getPopupContainer={trigger => trigger.parentElement}> to render a component inside Popover. (Or other getXxxxContainer props)

https://ant.design/components/select/#Select-props

Related issue: #3487 #3438

How do I prevent Select Dropdown DatePicker TimePicker Popover Popconfirm scrolling with the page?

Use <Select getPopupContainer={trigger => trigger.parentElement}> (API reference) to render a component inside the scroll area. If you need to config this globally in your application, try <ConfigProvider getPopupContainer={trigger => trigger.parentElement}> (API reference)

And make sure that parentElement is position: relative or position: absolute.

Related issue: #3487 #3438

How do I modify the default theme of Ant Design?

See: customize-theme.

How do I modify Menu/Button(etc.)'s style?

While you can override a component's style, we don't recommend doing so. antd is not only a set of React components, but also a design specification as well.

How to avoid breaking change when update version?

antd will avoid breaking change in minor & patch version. You can safe do follow things:

• Official demo usage
• FAQ suggestion. Including codesandbox sample, marked as FAQ issue

And which you should avoid to do:

• Bug as feature. It will break in any other case (e.g. Use div as Tabs children)
• Use magic code to realize requirement but which can be realized with normal API

How to use other data-time lib like Moment.js?

Please refer to Use custom date library.

It doesn't work when I change defaultValue dynamically.

The defaultXxxx (e.g. defaultValue) of Input/Select(etc...) only works on the first render. It is a specification of React. Please read React's documentation.

Why does modifying props in mutable way not trigger a component update?

antd use shallow compare of props to optimize performance. You should always pass the new object when updating the state. Please ref React's document

After I set the value of an Input/Select(etc.) component, the value cannot be changed by user's action.

Try onChange to change value, and please read React's documentation.

Components are not vertically aligned when placed in single row.

Try Space component to make them aligned.

antd overrides my global styles

Yes, antd is designed to help you develop a complete background application. To do so, we override some global styles for styling convenience, and currently these cannot be removed or changed. More info at https://github.com/ant-design/ant-design/issues/4331 .

Alternatively, follow the instructions in How to avoid modifying global styles?

I cannot install antd and antd's dependencies in mainland China.

To potentially solve this, try npm mirror china and cnpm.

I set dependencies.antd as the git repository in package.json, but it doesn't work.

Please install antd with either npm or yarn.

message and notification is lower case, but other components are capitalized. Is this a typo?

No, message is just a function, not a React Component, thus it is not a typo that it is in lower case.

antd doesn't work well in mobile.

Please check Ant Design Mobile as a possible solution, as antd has not been optimized to work well on mobile. You can also try the react-component repositories which start with 'm-' 'rn-', which are also designed for mobile.

Does antd supply standalone files like 'React'?

Yes, you can import antd with script tag, but we recommend using npm to import antd, as it is simple and easy to maintain.

How do I extend antd's components?

If you need some features which should not be included in antd, try to extend antd's component with HOC. more

How to get the definition which is not export?

antd will export mainly definitions, but not export internal definitions which may be rename or changed. So we recommend you to use Typescript's native ability to get the definition if needed:

import { Table } from 'antd';

type Props<T extends (...args: any) => any> = Parameters<T>[0];

type TableProps = Props<typeof Table<{ key: string; name: string; age: number }>>;
type DataSource = TableProps['dataSource'];

Date-related components locale is not working?

Please check whether you have imported dayjs locale correctly.

import 'dayjs/locale/zh-cn';

dayjs.locale('zh-cn');

Please check whether there are two versions of dayjs installed.

npm ls dayjs

If you are using a mismatched version of dayjs with antd's dayjs in your project. That would be a problem cause locale not working.

How do I fix dynamic styles while using a Content Security Policy (CSP)?

You can configure nonce by ConfigProvider.

When I set mode to DatePicker/RangePicker, why can I not select a year or month anymore?

In a real world development, you may need a YearPicker, MonthRangePicker or WeekRangePicker. You are trying to add mode to DatePicker/RangePicker expected to implement those pickers. However, the DatePicker/RangePicker cannot be selected and the panels won't close now.

• Reproduction link: https://codesandbox.io/s/dank-brook-v1csy
• Same issues：#15572, #16436, #11938, #11735, #11586, #10425, #11053

Like the explanation explains, this is because <DatePicker mode="year" /> does not equal the YearPicker, nor is <RangePicker mode="month" /> equal to MonthRangePicker. The mode property was added to support showing time picker panel in DatePicker in antd 3.0, which simply controls the displayed panel, and won't change the original date picking behavior of DatePicker/RangePicker (for instance you will still need to click date cell to finish selection in a DatePicker, whatever the mode is).

Likewise，disabledDate cannot work on year/month panels of <DatePicker mode="year/month" />, but only on cells of date panel.

Workaround

You can refer to this article or this article, using mode and onPanelChange to encapsulate a YearPicker or MonthRangePicker for your needs.

Or you can simply upgrade to antd@4.0, in which we added more XxxPickers to meet those requirements, and disabledDate could be effect on those pickers too.

message/notification/Modal.confirm lost styles when set prefixCls on ConfigProvider?

Static methods like message/notification/Modal.confirm are not using the same render tree as <Button />, but rendered to independent DOM node created by ReactDOM.render, which cannot access React context from ConfigProvider. Consider two solutions here:

1. Replace original usages with message.useMessage, notification.useNotification and Modal.useModal.

2. Use App.useApp to get message/notification/modal instance.

Why shouldn't I use component internal props or state with ref?

You should only access the API by official doc with ref. Directly access internal props or state is not recommended which will make your code strong coupling with current version. Any refactor will break your code like refactor with Hooks version, delete or rename internal props or state, adjust internal node constructor, etc.

Why we need align pop component with open prop?

For historical reasons, the display names of the pop components are not uniform, and both open and visible are used. This makes the memory cost that non-tsx users encounter when developing. It also leads to ambiguity about what name to choose when adding a feature. So we want to unify the attribute name, you can still use the original visible and it will still be backward compatible, but we will remove this attribute from the documentation as of v5.

Dynamic style using :where selector which not support old browser.

Please ref dynamic theme document Legacy Browser Compatible part.

How to disable motion?

Config with SeedToken:

import { ConfigProvider } from 'antd';

<ConfigProvider theme={{ token: { motion: false } }}>
  <App />
</ConfigProvider>;

CSS-in-JS css priority conflict with tailwindcss?

Same as above. You can adjust antd css priority to override. Related issue: #38794

How to let CSS-in-JS work with shadow DOM?

Please ref document Shadow Dom Usage.

How to support SSR？

Please ref dynamic theme document SSR part.

How to spell Ant Design correctly?

• ✅ Ant Design: Capitalized with space, for the design language.
• ✅ antd: all lowercase, for the React UI library.
• ✅ ant.design：For ant.design website url.

Here are some typical wrong examples:

• ❌ AntD
• ❌ antD
• ❌ Antd
• ❌ ant design
• ❌ AntDesign
• ❌ antdesign
• ❌ Antdesign

Do you guys have any channel or website for submitting monetary donations, like through PayPal or Alipay?

https://opencollective.com/ant-design

Use Form's setFieldsValue method to report an error if the object type contains null

When we try to set the form value using the setFieldsValue method in the form instance of the form component, if the passed object contains the type null, such as:

// This is not real world code, just for explain
import { Form } from 'antd';

type Test = {
  value: string[] | null;
};

export default () => {
  const [form] = Form.useForm<Test>();

  form.setFieldsValue({
    value: null, // Error: Type "null" cannot be assigned to type "string[] | undefined".
  });
};

If you encounter the above error, please check the current project tsconfig.json contains the following configuration:

{
  "strictNullChecks": true
}

The above problem occurs if strictNullChecks is set to true, If you can determine the project don't need this configuration (see strictNullChecks to judge whether need the configuration). You can try changing to false to turn off the control strict check. However, if you do need to enable this feature, you can avoid this situation by using other types instead of null when designing types

The antd component reported an error when using the App Router of Next.js

If you are using the App Router of Next.js, when you use the sub-components provided by some antd components, such as Select.Option , Form.Item, etc., you may get the following error:

Error: Cannot access .Option on the server. You cannot dot into a client module from a server component. You can only pass the imported name through.

At present, this problem is waiting for Next.js to give an official solution, before this, if you use sub-components in your page, you can try to add the following client tag at the top of the page to solve this problem:

'use client';

// This is not real world code, just for explain
export default () => {
  return (
    <div className="App">
      <Form>
        <Form.Item>
          <Button type="primary">Button</Button>
        </Form.Item>
      </Form>
    </div>
  );
};