| Property | Description | Type | Default | Version |
| --- | --- | --- | --- | --- |
| colon | Configure the default value of `colon` for Form.Item. Indicates whether the colon after the label is displayed (only effective when prop layout is horizontal) | boolean | true | |
| fields | Control of form fields through state management (such as redux). Not recommended for non-strong demand. View [example](#components-form-demo-global-state) | [FieldData](#FieldData)\[] | - | |
| form | Form control instance created by `Form.useForm()`. Automatically created when not provided | [FormInstance](#FormInstance) | - | |
| initialValues | Set value by Form initialization or reset | object | - | |
| requiredMark | Required mark style. Can use required mark or optional mark. You can not config to single Form.Item since this is a Form level config | boolean \| `optional` | true | 4.6.0 |
Form provides [default verification error messages](https://github.com/react-component/field-form/blob/master/src/utils/messages.ts). You can modify the template by configuring `validateMessages` property. A common usage is to configure localization:
Besides, [ConfigProvider](/components/config-provider/) also provides a global configuration scheme that allows for uniform configuration error notification templates:
| extra | The extra prompt message. It is similar to help. Usage example: to display error message and prompt message at the same time | ReactNode | - | |
| hasFeedback | Used with `validateStatus`, this option specifies the validation status icon. Recommended to be used only with `Input` | boolean | false | |
| labelCol | The layout of label. You can set `span``offset` to something like `{span: 3, offset: 12}` or `sm: {span: 3, offset: 12}` same as with `<Col>`. You can set `labelCol` on Form which will not affect nest Item. If both exists, use Item first | [object](/components/grid/#Col) | - | |
| trigger | When to collect the value of children node | string | `onChange` | |
| validateFirst | Whether stop validate on first rule of error for this field. Will parallel validate when `parallel` cofigured | boolean \| `parallel` | false | `parallel`: 4.5.0 |
| validateStatus | The validation status. If not provided, it will be generated by validation rule. options: `success``warning``error``validating` | string | - | |
| valuePropName | Props of children node, for example, the prop of Switch is 'checked'. This prop is an encapsulation of `getValueProps`, which will be invalid after customizing `getValueProps` | string | `value` | |
| wrapperCol | The layout for input controls, same as `labelCol`. You can set `wrapperCol` on Form which will not affect nest Item. If both exists, use Item first | [object](/components/grid/#Col) | - | |
After wrapped by `Form.Item` with `name` property, `value`(or other property defined by `valuePropName`) `onChange`(or other property defined by `trigger`) props will be added to form controls, the flow of form data will be handled by Form which will cause:
1. You shouldn't use `onChange` on each form control to **collect data**(use `onValuesChange` of Form), but you can still listen to `onChange`.
2. You cannot set value for each form control via `value` or `defaultValue` prop, you should set default value with `initialValues` of Form. Note that `initialValues` cannot be updated by `setState` dynamiclly, you should use `setFieldsValue` in that situation.
3. You shouldn't call `setState` manually, please use `form.setFieldsValue` to change value programmatically.
Used when there are dependencies between fields. If a field has the `dependencies` prop, this field will automatically trigger updates and validations when upstream is updated. A common scenario is a user registration form with "password" and "confirm password" fields. The "Confirm Password" validation depends on the "Password" field. After setting `dependencies`, the "Password" field update will re-trigger the validation of "Check Password". You can refer [examples](#components-form-demo-register).
Form updates only the modified field-related components for performance optimization purposes by incremental update. In most cases, you only need to write code or do validation with the [`dependencies`](#dependencies) property. In some specific cases, such as when a new field option appears with a filed value changed, or you just want to keep some area updating by form update, you can modify the update logic of Form.Item via the `shouldUpdate`.
When `shouldUpdate` is a function, it will be called by form values update. Providing original values and current value to compare. This is very helpful for rendering additional fields based on values:
Note: You should not config Form.Item `initialValue` under Form.List. It always should be configured by Form.List `initialValue` or Form `initialValues`.
Provide linkage between forms. If a sub form with `name` prop update, it will auto trigger Provider related events. See [example](#components-form-demo-form-context).
| getFieldsError | Get the error messages by the fields name. Return as an array | (nameList?: [NamePath](#NamePath)\[]) => FieldError\[] | |
| getFieldsValue | Get values by a set of field names. Return according to the corresponding structure | (nameList?: [NamePath](#NamePath)\[], filterFunc?: (meta: { touched: boolean, validating: boolean }) => boolean) => any | |
| isFieldsTouched | Check if fields have been operated. Check if all fields is touched when `allTouched` is `true` | (nameList?: [NamePath](#NamePath)\[], allTouched?: boolean) => boolean | |
| transform | Transform value to the rule before validation | (value) => any |
| type | Normally `string` \|`number` \|`boolean` \|`url` \| `email`. More type to ref [here](https://github.com/yiminghe/async-validator#type) | string |
It may be caused by your `validator` if it has some errors that prevents `callback` to be called. You can use `async` instead or use `try...catch` to catch the error:
`name` will fill value by array order. When there exists number in it and no related field in form store, it will auto convert field to array. If you want to keep it as object, use string like: `['1', 'name']`.
Before Modal opens, children elements do not exist in the view. You can set `forceRender` on Modal to pre-render its children. Click [here](https://codesandbox.io/s/antd-reproduction-template-ibu5c) to view an example.
Components inside Form.Item with name property will turn into controlled mode, which makes `defaultValue` not work anymore. Please try `initialValues` of Form to set default value.
### Why Form.List do not support `label` and need ErrorList to show errors?
Form.List use renderProps which mean internal structure is flexible. Thus `label` and `error` can not have best place. If you want to use antd `label`, you can wrap with Form.Item instead.
