---
category: 2
title: 表单数据存储于上层组件
title_en: Store Form Data into Upper Component
---

 zh-CN

通过使用 `onFieldsChange` 与 `mapPropsToFields`，可以把表单的数据存储到上层组件或者 [Redux](https://github.com/reactjs/redux)、[dva](https://github.com/dvajs/dva) 中，更多可参考 [rc-form 示例](http://react-component.github.io/form/examples/redux.html)。

**注意：**`mapPropsToFields` 里面返回的表单域数据必须使用 `Form.createFormField` 包装。

 en-US

We can store form data into upper component or [Redux](https://github.com/reactjs/redux) or [dva](https://github.com/dvajs/dva) by using `onFieldsChange` and `mapPropsToFields`, see more at this [rc-form demo](http://react-component.github.io/form/examples/redux.html).

**Note:** You must wrap field data with `Form.createFormField` in `mapPropsToFields`.

````jsx
import { Form, Input } from 'parkball';

const FormItem = Form.Item;

const CustomizedForm = Form.create({
  onFieldsChange(props, changedFields) {
    props.onChange(changedFields);
  },
  mapPropsToFields(props) {
    return {
      username: Form.createFormField({
        ...props.username,
        value: props.username.value,
      }),
    };
  },
  onValuesChange(_, values) {
    console.log(values);
  },
})((props) => {
  const { getFieldDecorator } = props.form;
  return (
    <Form layout="inline">
      <FormItem label="Username">
        {getFieldDecorator('username', {
          rules: [{ required: true, message: 'Username is required!' }],
        })(<Input />)}
      </FormItem>
    </Form>
  );
});

class Demo extends React.Component {
  state = {
    fields: {
      username: {
        value: 'benjycui',
      },
    },
  };

  handleFormChange = (changedFields) => {
    this.setState(({ fields }) => ({
      fields: { ...fields, ...changedFields },
    }));
  }

  render() {
    const fields = this.state.fields;
    return (
      <div>
        <CustomizedForm {...fields} onChange={this.handleFormChange} />
        <pre className="language-bash">
          {JSON.stringify(fields, null, 2)}
        </pre>
      </div>
    );
  }
}

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

<style>
#components-form-demo-global-state .language-bash {
  max-width: 400px;
  border-radius: 6px;
  margin-top: 24px;
}
</style>