npm package: @ifcloud-formily/react
Description: English | [简体中文](./README.zh-cn.md)
Latest version: 1.5.6

# @ifcloud-formily/react

English | [简体中文](./README.zh-cn.md)

> @ifcloud-formily/react is based on `react` and @ifcloud-formily/core is already built in. It provide API to manuplate form state and components for rendering support.
> it mainly includes:
>
> - Form
> - Field
> - VirtualField
> - FormaSpy
> - FormProvider
> - FormConsumer(deprecated，pls using FormSpy)
> - createFormActions (create sync API to manuplate form state)
> - createAsyncFormActions (create async API to manuplate form state)
> - FormEffectHooks (LifeCycles Hook)

### Install

```bash
npm install --save @ifcloud-formily/react
```

### Table Of Contents

<!-- toc -->

- [`Usage`](#Usage)
  - [`Quick Start`](#Quick-Start)
  - [`Basic Field`](#Basic-Field)
  - [`Validation`](#Validation)
  - [`Object Field`](#Object-Field)
  - [`ArrayField`](#ArrayField)
  - [`ArrayField<Object>`](#ArrayField<Object>)
  - [`display and visible`](#display-visible)
  - [`Linkage`](#Linkage)
  - [`Async Linkage`](#Async-Linkage)
  - [`Linkage Validation`](#Linkage-Validation)
  - [`Complex Linkage`](#Complex-Linkage)
  - [`Reuse Effects`](#Reuse-Effects)
  - [`Combo`](#Combo)
  - [`Provide and FormSpy`](#Provide-and-FormSpy)
  - [`Deconstruction`](#Deconstruction)
  - [`Complex Deconstruction`](#Complex-Deconstruction)
- [Components](#components)
  - [`<Form/>`](#Form)
  - [`<Field/>`](#Field)
  - [`<VirtualField/>`](#VirtualField)
  - [`<FormSpy/>`](#FormSpy)
  - [`<FormProvider/>`](#FormProvider)
  - [`<FormConsumer/>(deprecated，pls using <FormSpy/>)`](#formconsumerdeprecated，pls-using-formspy)
- [Hook](#Hook)
  - [`useFormEffects`](#useFormEffects)
  - [`useFormState`](#useFormState)
  - [`useFieldState`](#useFieldState)
  - [`useForm`](#useForm)
  - [`useField`](#useField)
  - [`useVirtualField`](#useVirtualField)
  - [`useFormSpy`](#useFormSpy)
- [API](#API)
  - [`createFormActions`](#createFormActions)
  - [`createAsyncFormActions`](#createAsyncFormActions)
  - [`FormEffectHooks`](#FormEffectHooks)
  - [`createEffectHook`](#createEffectHook)
- [Interfaces](#Interfaces)
  - [`IForm`](#IForm)
  - [`Imutators`](#Imutators)
  - [`IFormActions`](#IFormActions)
  - [`IFormAsyncActions`](#IFormAsyncActions)
  - [`IFieldState`](#IFieldState)
  - [`IVirtualFieldState`](#IVirtualFieldState)
  - [`IFormSpyProps`](#IFormSpyProps)
  - [`IFieldHook`](#IFieldHook)
  - [`IVirtualFieldHook`](#IVirtualFieldHook)
  - [`ISpyHook`](#ISpyHook)
  - [`SyncValidateResponse`](#SyncValidateResponse)
  - [`AsyncValidateResponse`](#AsyncValidateResponse)
  - [`ValidateResponse`](#ValidateResponse)
  - [`InternalFormats`](#InternalFormats)
  - [`CustomValidator`](#CustomValidator)
  - [`ValidateDescription`](#ValidateDescription)
  - [`ValidateArrayRules`](#ValidateArrayRules)
  - [`ValidatePatternRules`](#ValidatePatternRules)
  - [`IFieldAPI`](#IFieldAPI)
  - [`IVirtualFieldAPI`](#IVirtualFieldAPI)

### Usage

---

#### Quick Start

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  FormPath,
  createFormActions,
  FormSpy,
  FormProvider,
  FormConsumer,
  FormEffectHooks
} from '@ifcloud-formily/react'

const { onFormInit$, onFormInputChange$, onFieldInputChange$ } = FormEffectHooks
const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={() => {
        onFormInit$().subscribe(() => {
          console.log('initialized')
        })
        onFieldInputChange$().subscribe(state => {
          console.log('field change', state)
        })
      }}
      onChange={() => {}}
    >
      <React.Fragment>
        <label>username: </label>
        <Field name="username">
          {({ state, mutators }) => (
            <React.Fragment>
              <input
                disabled={!state.editable}
                value={state.value || ''}
                onChange={mutators.change}
                onBlur={mutators.blur}
                onFocus={mutators.focus}
              />
              {state.errors}
              {state.warnings}
            </React.Fragment>
          )}
        </Field>
      </React.Fragment>
    </Form>
  )
}
ReactDOM.render(<App />, document.getElementById('root'))
```

#### Basic Field

Example：Show you how to bind the `<input>` field and subsequent examples are based on this field

```tsx
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <div>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        {state.errors}
        {state.warnings}
      </div>
    )}
  </Field>
)
```

#### Validation

Example：required validation + error type validation + warning type validation + custom validation
The type of rules is [ValidatePatternRules](#ValidatePatternRules) which is [InternalFormats](#InternalFormats) | [CustomValidator](#CustomValidator) | [ValidateDescription](#ValidateDescription) | [ValidateArrayRules](#ValidateArrayRules)

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <h5>required validation</h5>
      <span>username</span>
      <InputField name="username" required />

      <h5>error type validation</h5>
      <span>age</span>
      <InputField
        name="age"
        rules={[
          val =>
            !val ? { type: 'error', message: 'age is required' } : undefined
        ]}
      />

      <h5>warning type validation</h5>
      <span>gender</span>
      <InputField
        name="gender"
        rules={[
          val =>
            !val
              ? { type: 'warning', message: 'gender is required' }
              : undefined
        ]}
      />

      <h5>built-in validation default to error type validation</h5>
      <span>id</span>
      <InputField
        name="id"
        rules={[
          {
            format: 'number',
            message: 'id is not a number.'
          }
        ]}
      />

      <h5>custom validation</h5>
      <span>verifyCode</span>
      <InputField
        name="verifyCode"
        rules={[
          {
            validator(value) {
              return !value
                ? 'This field can not be empty, please enter {{scope.outerVariable}}'
                : undefined
            },
            scope: {
              outerVariable: '456'
            }
          },

          {
            validator(value) {
              return value === '456'
                ? { type: 'error', message: 'This field can not be 456' }
                : undefined
            }
          }
        ]}
      />

      <div>
        <button
          onClick={() => {
            const result = actions.validate()
            console.log(actions.getFormState(state => state.values))
            result.then(validateResp => {
              console.log(validateResp)
            })
          }}
        >
          validate
        </button>
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Object Field

Example：User info `user(username, age)`

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <span>user</span>
      <Field
        name="user"
        initialValue={{
          username: undefined,
          age: undefined
        }}
      >
        {({ state, mutators }) => {
          return (
            <React.Fragment>
              {Object.keys(state.value).map(key => {
                if (!mutators.exist(key)) return

                return (
                  <div key={key}>
                    <span>{key}</span>
                    <InputField name={`user.${key}`} />
                    <button
                      onClick={() => {
                        mutators.remove(key)
                      }}
                    >
                      x
                    </button>
                  </div>
                )
              })}
              <button
                onClick={() => {
                  mutators.change({
                    ...state.value,
                    [new Date().getTime()]: new Date().getTime()
                  })
                }}
              >
                +
              </button>
              <button
                onClick={() => {
                  console.log(
                    'values',
                    actions.getFormState(state => state.values)
                  )
                }}
              >
                print
              </button>
            </React.Fragment>
          )
        }}
      </Field>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### ArrayField

Example：Id list

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <Field name="idList" initialValue={['1', '2', '3']}>
        {({ state, mutators }) => {
          return (
            <React.Fragment>
              {state.value.map((item, index) => {
                return (
                  <div key={index}>
                    <InputField name={`idList[${index}]`} />
                    <button onClick={() => mutators.remove(index)}>
                      Remove
                    </button>
                  </div>
                )
              })}
              <button onClick={() => mutators.push()}>Add Item</button>
            </React.Fragment>
          )
        }}
      </Field>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### ArrayField&lt;Object&gt;

Example：User list

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <Field
        name="userList"
        initialValue={[
          { username: 'bobby', age: 21 },
          { username: 'lily', age: 20 }
        ]}
      >
        {({ state, mutators }) => {
          return (
            <React.Fragment>
              {state.value.map((item, index) => {
                return (
                  <div key={index}>
                    <Field name={`userList[${index}]`} initialValue={{}}>
                      {({ state: innerState, mutators: innerMutator }) => {
                        return (
                          <React.Fragment>
                            {Object.keys(innerState.value).map(key => {
                              if (!innerMutator.exist(key)) return
                              return (
                                <React.Fragment key={key}>
                                  <InputField
                                    name={`userList[${index}].${key}`}
                                  />
                                  <button
                                    onClick={() => {
                                      innerMutator.remove(key)
                                    }}
                                  >
                                    x
                                  </button>
                                </React.Fragment>
                              )
                            })}
                            <button
                              onClick={() => {
                                innerMutator.change({
                                  ...innerState.value,
                                  [new Date().getTime()]: new Date().getTime()
                                })
                              }}
                            >
                              +
                            </button>
                          </React.Fragment>
                        )
                      }}
                    </Field>

                    <button onClick={() => mutators.remove(index)}>
                      Remove
                    </button>
                  </div>
                )
              })}
              <button
                onClick={() =>
                  mutators.push({
                    username: undefined,
                    age: undefined
                  })
                }
              >
                Add Item
              </button>
              <button
                onClick={() =>
                  console.log(actions.getFormState(state => state.values))
                }
              >
                print
              </button>
            </React.Fragment>
          )
        }}
      </Field>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### display visible

Example: see how `display` 与 `visible` affect values

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  LifeCycleTypes,
  FormSpy
} from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const CheckedField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              type="checkbox"
              onChange={() => {
                mutators.change(!state.value)
              }}
              checked={!!state.value}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={($, { validate, setFieldState }) => {
        $(LifeCycleTypes.ON_FORM_INIT).subscribe(() => {
          setFieldState('displayTrigger', state => (state.value = true))
          setFieldState('visibleTrigger', state => (state.value = true))
          setFieldState('a', state => (state.value = 1))
          setFieldState('b', state => (state.value = 2))
        })

        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'visibleTrigger').subscribe(
          fieldState => {
            setFieldState('a', state => {
              state.visible = fieldState.value
            })
          }
        )

        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'displayTrigger').subscribe(
          fieldState => {
            setFieldState('b', state => {
              state.display = fieldState.value
            })
          }
        )
      }}
    >
      <div>
        <CheckedField label="visible" name="visibleTrigger" />

        <InputField name="a" label="a" />
      </div>
      <div>
        <CheckedField label="display" name="displayTrigger" />
        <InputField name="b" label="b" />
      </div>

      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              {JSON.stringify(form.getFormState(state => state.values))}
            </div>
          )
        }}
      </FormSpy>

      <button
        onClick={() => console.log(actions.getFormState(state => state.values))}
      >
        print
      </button>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Linkage

Example：Show/hide field and modified props/value by using effects

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, LifeCycleTypes } from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const CheckedField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              type="checkbox"
              onChange={() => {
                mutators.change(!state.value)
              }}
              checked={!!state.value}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={($, { setFieldState }) => {
        $(LifeCycleTypes.ON_FORM_INIT).subscribe(() => {
          setFieldState('a~', state => (state.visible = false))
        })

        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'trigger').subscribe(
          triggerState => {
            setFieldState('a~', state => {
              state.visible = triggerState.value
            })
          }
        )

        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'a').subscribe(fieldState => {
          setFieldState('a-copy', state => {
            state.value = fieldState.value
          })
        })
      }}
    >
      <CheckedField name="trigger" label="show/hide" />
      <div>
        <InputField label="a" name="a" />
      </div>
      <div>
        <InputField label="a-copy" name="a-copy" />
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Async Linkage

Example：Change dataSource in select asynchronously by effects

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, LifeCycleTypes } from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)
const CheckedField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              type="checkbox"
              onChange={() => {
                mutators.change(!state.value)
              }}
              checked={!!state.value}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const SelectField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const { loading, dataSource = [] } = state.props
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <select
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            >
              {dataSource.map(item => (
                <option value={item.value}>{item.label}</option>
              ))}
            </select>
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={($, { setFieldState }) => {
        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'trigger').subscribe(
          fieldState => {
            const dataSource = [
              { label: 'aa', value: 'aa' },
              { label: 'bb', value: 'bb' }
            ]
            setFieldState('sync-source', state => {
              state.props.dataSource = fieldState.value ? dataSource : []
            })
            setFieldState('async-source', state => {
              state.props.loading = true
            })

            setTimeout(() => {
              setFieldState('async-source', state => {
                state.props.loading = false
                state.props.dataSource = fieldState.value ? dataSource : []
              })
            }, 300)
          }
        )
      }}
    >
      <CheckedField name="trigger" label="show/reset dataSource" />
      <div>
        <SelectField label="sync-source" name="sync-source" />
      </div>
      <div>
        <SelectField label="async-source" name="async-source" />
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Linkage Validation

Example：validation when form mounted and re-trigger validation when field change

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, LifeCycleTypes } from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={($, { validate, setFieldState }) => {
        $(LifeCycleTypes.ON_FORM_MOUNT).subscribe(() => {
          validate()
        })

        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'a').subscribe(fieldState => {
          setFieldState('a-copy', state => {
            state.value = fieldState.value
          })
        })
      }}
    >
      <InputField label="a" name="a" />
      <div>
        <InputField label="a-copy" name="a-copy" required />
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Complex Linkage

Example：See how ArrayField communicate with other field by using effects

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, LifeCycleTypes } from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={($, { validate, setFieldState }) => {
        $(LifeCycleTypes.ON_FORM_INIT).subscribe(() => {
          setFieldState('userList.*.username', state => {
            state.visible = false
          })
        })

        $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'trigger').subscribe(
          fieldState => {
            setFieldState('userList.*.username', state => {
              state.visible = fieldState.value
            })
          }
        )
      }}
    >
      <div>
        <Field name="trigger" label="show/hide username">
          {({ state, mutators }) => {
            return (
              <input
                type="checkbox"
                onChange={mutators.change}
                checked={state.value ? 'checked' : undefined}
              />
            )
          }}
        </Field>
      </div>
      <div>
        <Field
          initialValue={[
            { username: 'bobby', age: 22 },
            { username: 'lily', age: 21 }
          ]}
          name="userList"
        >
          {({ state, mutators }) => {
            return (
              <React.Fragment>
                {state.value.map((item, index) => {
                  return (
                    <div key={index}>
                      <Field name={`userList[${index}]`} initialValue={{}}>
                        {({ state: innerState, mutators: innerMutator }) => {
                          return (
                            <React.Fragment>
                              {Object.keys(innerState.value).map(key => {
                                if (!innerMutator.exist(key)) return
                                return (
                                  <React.Fragment key={key}>
                                    <InputField
                                      label={key}
                                      name={`userList[${index}].${key}`}
                                    />
                                  </React.Fragment>
                                )
                              })}
                              <button
                                onClick={() => {
                                  innerMutator.change({
                                    ...innerState.value,
                                    [new Date().getTime()]: new Date().getTime()
                                  })
                                }}
                              >
                                +
                              </button>
                            </React.Fragment>
                          )
                        }}
                      </Field>

                      <button onClick={() => mutators.remove(index)}>
                        Remove
                      </button>
                    </div>
                  )
                })}
                <button
                  onClick={() =>
                    mutators.push({
                      username: undefined,
                      age: undefined
                    })
                  }
                >
                  Add Item
                </button>
                <button
                  onClick={() =>
                    console.log(actions.getFormState(state => state.values))
                  }
                >
                  print
                </button>
              </React.Fragment>
            )
          }}
        </Field>
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Reuse Effects

Make your own reusable effects.

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, FormEffectHooks } from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)
const CheckedField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              type="checkbox"
              onChange={() => {
                mutators.change(!state.value)
              }}
              checked={!!state.value}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const { onFormMount$, onFieldValueChange$ } = FormEffectHooks
const getEffects = () => {
  const actions = createFormActions()
  onFormMount$().subscribe(() => {
    actions.setFieldState('a~', state => (state.visible = false))
  })

  onFieldValueChange$('trigger').subscribe(triggerState => {
    actions.setFieldState('a~', state => {
      state.visible = triggerState.value
    })
  })

  onFieldValueChange$('a').subscribe(fieldState => {
    actions.setFieldState('a-copy', state => {
      state.value = fieldState.value
    })
  })
}

const actions = createFormActions()
const App = () => {
  return (
    <Form
      actions={actions}
      effects={() => {
        getEffects()
      }}
    >
      <CheckedField name="trigger" label="show/hide" />
      <div>
        <InputField label="a" name="a" />
      </div>
      <div>
        <InputField label="a-copy" name="a-copy" />
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Combo

Example：Combo value of username and age. Check [FormSpy](#FormSpy) for more inforation.

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, FormSpy } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <label>username</label>
      <InputField name="username" />
      <label>age</label>
      <InputField name="age" />
      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              name: {form.getFieldValue('username')}
              <br />
              age: {form.getFieldValue('age')}
            </div>
          )
        }}
      </FormSpy>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Provide and FormSpy

```typescript
Dictionary
--app
  |---components
  |---customForm
```

Example：Cross-file consumption form state, Check [FormProvider](#FormProvider) and [FormSpy](#FormSpy) for more information.

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  FormSpy,
  FormProvider
} from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const CustomForm = () => {
  return (
    <Form actions={actions}>
      <label>username</label>
      <InputField name="username" />
      <label>age</label>
      <InputField name="age" />
    </Form>
  )
}

const App = () => {
  return (
    <FormProvider>
      <CustomForm />
      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              name: {form.getFieldValue('username')}
              <br />
              age: {form.getFieldValue('age')}
            </div>
          )
        }}
      </FormSpy>
    </FormProvider>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Deconstruction

```jsx
import React, { useState } from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  FormSpy,
  FormPath
} from '@ifcloud-formily/react'

const actions = createFormActions()

const App = () => {
  return (
    <Form actions={actions}>
      <label>range input</label>
      <Field name="[start,end]">
        {({ state, mutators }) => {
          const [start, end] = state.value
          return (
            <div>
              <label>start</label>
              <input
                value={start}
                onChange={e => {
                  mutators.change([e.target.value, end])
                }}
              />
              <label>end</label>
              <input
                value={end}
                onChange={e => {
                  mutators.change([start, e.target.value])
                }}
              />
            </div>
          )
        }}
      </Field>
      <button
        onClick={() => {
          actions.setFormState(state => {
            state.values = { start: 'x', end: 'y' }
          })
        }}
      >
        set value
      </button>
      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              Form values:
              <code>
                <pre>
                  {JSON.stringify(
                    form.getFormState(state => state.values),
                    null,
                    2
                  )}
                </pre>
              </code>
            </div>
          )
        }}
      </FormSpy>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### Complex Deconstruction

```jsx
import React, { useState } from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  FormSpy,
  FormPath
} from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <Field name="{aa:{bb:{cc:destructor1,dd:[destructor2,destructor3],ee}}}">
        {({ state, mutators }) => {
          return (
            <div>
              <button
                onClick={() => {
                  mutators.change({
                    aa: {
                      bb: {
                        cc: 123,
                        dd: [333, 444],
                        ee: 'abcde'
                      }
                    }
                  })
                }}
              >
                set value
              </button>
              <div>Field value:</div>
              <code>
                <pre>{JSON.stringify(state.value, null, 2)}</pre>
              </code>
            </div>
          )
        }}
      </Field>
      <button
        onClick={() => {
          actions.setFieldState(
            FormPath.match(
              '[[{aa:{bb:{cc:destructor1,dd:\\[destructor2,destructor3\\],ee}}}]]'
            ),
            state => {
              state.value = {
                aa: {
                  bb: {
                    cc: 'a',
                    dd: ['b', 'c'],
                    ee: 'd'
                  }
                }
              }
            }
          )
        }}
      >
        outside set
      </button>
      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              Form values:
              <code>
                <pre>
                  {JSON.stringify(
                    form.getFormState(state => state.values),
                    null,
                    2
                  )}
                </pre>
              </code>
            </div>
          )
        }}
      </FormSpy>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

### Components

---

#### `<Form/>`

> `<Form>` Props

```typescript
interface IFormProps {
  // Form value
  value?: any
  defaultValue?: any // Form initial value
  initialValues?: any
  // formAPI
  actions?: IFormActions | IFormAsyncActions
  // effect
  effects?: IFormEffect<any, IFormActions | IFormAsyncActions>
  // IForm instance
  form?: IForm // Form change event callback
  onChange?: (values: Value) => void // Form submission event callback
  onSubmit?: (values: Value) => void | Promise<Value> // Form reset event callback
  onReset?: () => void // Form verification failure event callback
  onValidateFailed?: (valideted: IFormValidateResult) => void
  children?: React.ReactElement | ((form: IForm) => React.ReactElement)
  // Whether to use the dirty check, the default will go immer accurate update
  useDirty?: boolean
  // Is it editable, overall control in the Form dimension
  editable?: boolean
  // Whether to go pessimistic check, stop the subsequent check when the first check fails
  validateFirst?: boolean
}
```

#### `<Field/>`

> `<Field>` Props

```typescript
interface IFieldStateUIProps {
  // Node path
  path?: FormPathPattern // Node path
  nodePath?: FormPathPattern // Data path
  dataPath?: FormPathPattern // Data path
  name?: string // Field value, is equal to values[0]
  value?: any // Field multi-parameter value, such as when the field onChange trigger, the event callback passed multi-parameter data, then the value of all parameters will be stored here
  values?: any[] // Initial value

  initialValue?: any // field extension properties
  visible?: boolean //Field initial visible status(Whether the data and style is visible)
  display?: boolean //Field initial display status(Whether the style is visible)
  props?: FieldProps // Check the rules, the specific type description refers to the following documents
  rules?: ValidatePatternRules[] // Is it required?
  required?: boolean // Is it editable?
  editable?: boolean // Whether to use the dirty check, the default will go immer accurate update
  useDirty?: boolean
  // Field state calculation container, mainly used to extend the core linkage rules
  computeState?: (draft: IFieldState, prevState: IFieldState) => void
  // type of trigger validation
  triggerType?: 'onChange' | 'onBlur'
  // get value from browser event(eg. e.target.value)
  getValueFromEvent?: (...args: any[]) => any
  children?: React.ReactElement | ((api: IFieldAPI) => React.ReactElement)
}
```

**Usage**

Example：All type of field

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <div>
        <h5>Basic Field</h5>
        <Field name="id">
          {({ state, mutator }) => {
            return <input value={state.value} onChange={mutator} />
          }}
        </Field>
      </div>

      <div>
        <h5>Object Field</h5>
        <Field
          name="user"
          initialValue={{
            username: undefined,
            age: undefined
          }}
        >
          {({ state, mutators }) => {
            return (
              <React.Fragment>
                {Object.keys(state.value).map(key => {
                  if (!mutators.exist(key)) return

                  return (
                    <div key={key}>
                      <span>{key}</span>
                      <InputField name={`user.${key}`} />
                      <button
                        onClick={() => {
                          mutators.remove(key)
                        }}
                      >
                        x
                      </button>
                    </div>
                  )
                })}
                <button
                  onClick={() => {
                    mutators.change({
                      ...state.value,
                      [new Date().getTime()]: new Date().getTime()
                    })
                  }}
                >
                  +
                </button>
              </React.Fragment>
            )
          }}
        </Field>
      </div>

      <div>
        <h5>ArrayField Field</h5>
        <Field name="idList" initialValue={['1', '2', '3']}>
          {({ state, mutators }) => {
            return (
              <React.Fragment>
                {state.value.map((item, index) => {
                  return (
                    <div key={index}>
                      <InputField name={`idList[${index}]`} />
                      <button onClick={() => mutators.remove(index)}>
                        Remove
                      </button>
                    </div>
                  )
                })}
                <button onClick={() => mutators.push()}>Add Item</button>
              </React.Fragment>
            )
          }}
        </Field>
      </div>

      <div>
        <h5>ArrayObject Field</h5>
        <Field
          name="userList"
          initialValue={[
            { username: 'bobby', age: 21 },
            { username: 'lily', age: 20 }
          ]}
        >
          {({ state, mutators }) => {
            return (
              <React.Fragment>
                {state.value.map((item, index) => {
                  return (
                    <div key={index}>
                      <Field name={`userList[${index}]`} initialValue={{}}>
                        {({ state: innerState, mutators: innerMutator }) => {
                          return (
                            <React.Fragment>
                              {Object.keys(innerState.value).map(key => {
                                if (!innerMutator.exist(key)) return
                                return (
                                  <React.Fragment key={key}>
                                    <InputField
                                      name={`userList[${index}].${key}`}
                                    />
                                    <button
                                      onClick={() => {
                                        innerMutator.remove(key)
                                      }}
                                    >
                                      x
                                    </button>
                                  </React.Fragment>
                                )
                              })}
                              <button
                                onClick={() => {
                                  innerMutator.change({
                                    ...innerState.value,
                                    [new Date().getTime()]: new Date().getTime()
                                  })
                                }}
                              >
                                +
                              </button>
                            </React.Fragment>
                          )
                        }}
                      </Field>

                      <button onClick={() => mutators.remove(index)}>
                        Remove
                      </button>
                    </div>
                  )
                })}
                <button
                  onClick={() =>
                    mutators.push({
                      username: undefined,
                      age: undefined
                    })
                  }
                >
                  Add Item
                </button>
              </React.Fragment>
            )
          }}
        </Field>
      </div>
      <button
        onClick={() => console.log(actions.getFormState(state => state.values))}
      >
        print
      </button>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### `<VirtualField/>`

> `<VirtualField>` Props

```typescript
interface IVirtualFieldProps {
  // Node path
  path?: FormPathPattern // Node path
  nodePath?: FormPathPattern // Data path
  dataPath?: FormPathPattern // Data path
  visible?: boolean //Field initial visible status(Whether the data and style is visible)
  display?: boolean //Field initial display status(Whether the style is visible)
  name?: string // Form extension properties
  props?: FieldProps // Whether to use the dirty check, the default will go immer accurate update
  useDirty?: boolean
  // Field state calculation container, mainly used to extend the core linkage rules
  computeState?: (draft: IFieldState, prevState: IFieldState) => void
  children?: React.ReactElement | ((api: IFieldAPI) => React.ReactElement)
}
```

**Usage**

Example：Setting `<Layout>` size from 100x100 to 200x200

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, VirtualField } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const Layout = ({ children, width = '100px', height = '100px' }) => {
  return (
    <div style={{ border: '1px solid #999', width, height }}>{children}</div>
  )
}

const App = () => {
  return (
    <Form actions={actions}>
      <Field name="user" initialValue={{}}>
        {({ state, mutator }) => {
          return (
            <VirtualField name="user.layout">
              {({ state: layoutState }) => {
                return (
                  <Layout
                    width={layoutState.props.width}
                    height={layoutState.props.height}
                  >
                    <label>username</label>
                    <InputField name="username" />
                    <label>age</label>
                    <InputField name="age" />
                  </Layout>
                )
              }}
            </VirtualField>
          )
        }}
      </Field>

      <button
        onClick={() => {
          // some where dynamic change layout's props
          actions.setFieldState('user.layout', state => {
            state.props.width = '200px'
            state.props.height = '200px'
          })
        }}
      >
        change layout
      </button>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### `<FormSpy/>`

> `<FormSpy>` Props

```typescript
interface IFormSpyProps {
  // selector, eg: [ LifeCycleTypes.ON_FORM_SUBMIT_START, LifeCycleTypes.ON_FORM_SUBMIT_END ]
  selector?: string[] | string
  // reducer
  reducer?: (
    state: any,
    action: { type: string; payload: any },
    form: IForm
  ) => any
  children?: React.ReactElement | ((api: IFormSpyAPI) => React.ReactElement)
}
```

**Usage**

Example1： Form state change counter

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  FormSpy,
  LifeCycleTypes
} from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <label>username</label>
      <InputField name="username" />
      <label>age</label>
      <InputField name="age" />
      <FormSpy
        selector={LifeCycleTypes.ON_FORM_VALUES_CHANGE}
        reducer={(state, action, form) => ({
          count: state.count ? state.count + 1 : 1
        })}
      >
        {({ state, type, form }) => {
          return <div>count: {state.count || 0}</div>
        }}
      </FormSpy>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

Example2：Combo

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import { Form, Field, createFormActions, FormSpy } from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const App = () => {
  return (
    <Form actions={actions}>
      <label>username</label>
      <InputField name="username" />
      <label>age</label>
      <InputField name="age" />
      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              name: {form.getFieldValue('username')}
              <br />
              age: {form.getFieldValue('age')}
            </div>
          )
        }}
      </FormSpy>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### `<FormProvider/>`

> Used with FormSpy, often used in Cross-file consumption form state

**Usage**

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  FormSpy,
  FormProvider
} from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => (
      <React.Fragment>
        <input
          disabled={!state.editable}
          value={state.value || ''}
          onChange={mutators.change}
          onBlur={mutators.blur}
          onFocus={mutators.focus}
        />
        <span style={{ color: 'red' }}>{state.errors}</span>
        <span style={{ color: 'orange' }}>{state.warnings}</span>
      </React.Fragment>
    )}
  </Field>
)

const CustomForm = () => {
  return (
    <Form actions={actions}>
      <label>username</label>
      <InputField name="username" />
      <label>age</label>
      <InputField name="age" />
    </Form>
  )
}

const App = () => {
  return (
    <FormProvider>
      <CustomForm />
      <FormSpy>
        {({ state, form }) => {
          return (
            <div>
              name: {form.getFieldValue('username')}
              <br />
              age: {form.getFieldValue('age')}
            </div>
          )
        }}
      </FormSpy>
    </FormProvider>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### `<FormConsumer/>(deprecated，pls using <FormSpy/>)`

> `<FormConsumer>` Props

```typescript
interface IFormConsumerProps {
  // eg.[ LifeCycleTypes.ON_FORM_SUBMIT_START, LifeCycleTypes.ON_FORM_SUBMIT_END ]
  selector?: string[] | string
  children?:
    | React.ReactElement
    | ((api: IFormConsumerAPI) => React.ReactElement)
}
```

### Hook

#### `useFormEffects`

> Implement local effects by using useFormEffects. Same effect as the example of [Linkage](#Linkage)
> Note: The life cycle of the listener starts from `ON_FORM_MOUNT`

**Signature**

```typescript
(effects: IFormEffect): void
```

```jsx
import React from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  createFormActions,
  useFormEffects,
  LifeCycleTypes
} from '@ifcloud-formily/react'

const actions = createFormActions()
const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const CheckedField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              type="checkbox"
              onChange={() => {
                mutators.change(!state.value)
              }}
              checked={!!state.value}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const FormFragment = () => {
  useFormEffects(($, { setFieldState }) => {
    $(LifeCycleTypes.ON_FORM_INIT).subscribe(() => {
      setFieldState('a~', state => (state.visible = false))
    })

    $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'trigger').subscribe(
      triggerState => {
        setFieldState('a~', state => {
          state.visible = triggerState.value
        })
      }
    )

    $(LifeCycleTypes.ON_FIELD_VALUE_CHANGE, 'a').subscribe(fieldState => {
      setFieldState('a-copy', state => {
        state.value = fieldState.value
      })
    })
  })

  return (
    <React.Fragment>
      <CheckedField name="trigger" label="show/hide" />
      <div>
        <InputField label="a" name="a" />
      </div>
      <div>
        <InputField label="a-copy" name="a-copy" />
      </div>
    </React.Fragment>
  )
}

const App = () => {
  return (
    <Form actions={actions}>
      <FormFragment />
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### `useFormState`

> 使用 useFormState 为自定义组件提供 FormState 扩展和管理能力

**签名**

```typescript
(defaultState: T): [state: IFormState, setFormState: (state?: IFormState) => void]
```

**用法**

```jsx
import React, { useRef } from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  VirtualField,
  createFormActions,
  createEffectHook,
  useForm,
  useFormState,
  useFormEffects,
  useFieldState,
  LifeCycleTypes
} from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const actions = createFormActions()
const FormFragment = props => {
  const [formState, setFormState] = useFormState({ extendVar: 0 })
  const { extendVar } = formState

  return (
    <div>
      <button
        onClick={() => {
          setFormState({ extendVar: extendVar + 1 })
        }}
      >
        add
      </button>
      <div>count: {extendVar}</div>
    </div>
  )
}

const App = () => {
  return (
    <Form actions={actions}>
      <FormFragment />
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### `useFieldState`

> Manage state of custom field by using `useFieldState`

**Signature**

```typescript
(defaultState: T): [state: IFieldState, setFieldState: (state?: IFieldState) => void]
```

```jsx
import React, { useRef } from 'react'
import ReactDOM from 'react-dom'
import {
  Form,
  Field,
  VirtualField,
  createFormActions,
  createEffectHook,
  useForm,
  useFormEffects,
  useFieldState,
  LifeCycleTypes
} from '@ifcloud-formily/react'

const InputField = props => (
  <Field {...props}>
    {({ state, mutators }) => {
      const loading = state.props.loading
      return (
        <React.Fragment>
          {props.label && <label>{props.label}</label>}
          {loading ? (
            ' loading... '
          ) : (
            <input
              disabled={!state.editable}
              value={state.value || ''}
              onChange={mutators.change}
              onBlur={mutators.blur}
              onFocus={mutators.focus}
            />
          )}
          <span style={{ color: 'red' }}>{state.errors}</span>
          <span style={{ color: 'orange' }}>{state.warnings}</span>
        </React.Fragment>
      )
    }}
  </Field>
)

const changeTab$ = createEffectHook('changeTab')
const actions = createFormActions()
const TabFragment = props => {
  const [fieldState, setLocalFieldState] = useFieldState({ current: 0 })
  const { current } = fieldState
  const { children, dataSource, form } = props
  const ref = useRef(current)

  const update = cur => {
    form.notify('changeTab', cur)
    setLocalFieldState({
      current: cur
    })
  }

  useFormEffects(($, { setFieldState }) => {
    dataSource.forEach((item, itemIdx) => {
      setFieldState(item.name, state => {
        state.display = itemIdx === current
      })
    })

    changeTab$().subscribe(idx => {
      dataSource.forEach((item, itemIdx) => {
        setFieldState(item.name, state => {
          state.display = itemIdx === idx
        })
      })
    })
  })

  ref.current = current
  const btns = dataSource.map((item, idx) => {
    console.log('current', current, ref.current)
    const focusStyle =
      idx === current ? { color: '#fff', background: 'blue' } : {}
    return (
      <button
        style={focusStyle}
        onClick={() => {
          update(idx)
        }}
      >
        {item.label}
      </button>
    )
  })

  return btns
}

const FormTab = props => {
  return (
    <VirtualField name="layout_tab">
      {({ form }) => {
        return <TabFragment {...props} form={form} />
      }}
    </VirtualField>
  )
}

const App = () => {
  return (
    <Form actions={actions}>
      <FormTab
        dataSource={[
          { label: 'tab-1', name: 'username' },
          { label: 'tab-2', name: 'age' }
        ]}
      />
      <div>
        <InputField name="username" label="username" />
        <InputField name="age" label="age" />
      </div>
    </Form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

#### useForm

> get [IForm](#IForm) instance

**Signature**

```typescript
type useForm = <
  Value = any,
  DefaultValue = any,
  EffectPayload = any,
  EffectAction = any
>(
  props: IFormProps<Value, DefaultValue, EffectPayload, EffectAction>
) => IForm
```

**Usage**

```typescript
import { useForm } from '@ifcloud-formily/react'

const FormFragment = () => {
  const form = useForm()
  return <div>{form.getFieldValue('username')}</div>
}
```

#### useField

> get [IFieldHook](#IFieldHook) instance

**Signature**

```typescript
type useField = (options: IFieldStateUIProps): IFieldHook
```

**Usage**

```typescript
import { useField } from '@ifcloud-formily/react'

const FormFragment = props => {
  const { form, state, props: fieldProps, mutators } = useField({
    name: 'username'
  })

  return (
    <input
      {...fieldProps}
      {...props}
      value={state.value}
      onChange={mutators.change}
    />
  )
}
```

#### useVirtualField

> get [IVirtualFieldHook](#IVirtualFieldHook) instance

**Signature**

```typescript
type UseVirtualField = (options: IVirtualFieldStateProps): IVirtualFieldHook
```

**Usage**

```typescript
import { UseVirtualField } from '@ifcloud-formily/react'

const FormFragment