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<cn>
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#### 表单数据存储于上层组件
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通过使用 `onFieldsChange` 与 `mapPropsToFields`，可以把表单的数据存储到上层组件。
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**注意：**
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`mapPropsToFields` 里面返回的表单域数据必须使用 `Form.createFormField` 包装。
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上层组件传递的属性，必须在`Form.create({ props: ...})`的props中声明。
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</cn>
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<us>
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#### Store Form Data into Upper Component
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We can store form data into upper component.
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**Note:**
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You must wrap field data with `Form.createFormField` in `mapPropsToFields`.
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The properties passed by the upper component must be declared in the props of `Form.create({ props: ...})`.
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</us>
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<script>
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import { Form } from 'ant-design-vue'
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const CustomizedForm = Form.create({
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props: ['username'], // must declare like vue `props` https://vuejs.org/v2/api/#props
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onFieldsChange (instance, changedFields) {
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instance.$emit('change', changedFields)
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},
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mapPropsToFields (props) {
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return {
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username: Form.createFormField({
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...props.username,
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value: props.username.value,
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}),
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}
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},
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onValuesChange (_, values) {
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console.log(values)
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},
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})({
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render () {
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const { getFieldDecorator } = this.form
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return (
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<a-form layout='inline'>
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<a-form-item label='Username'>
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{getFieldDecorator('username', {
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rules: [{ required: true, message: 'Username is required!' }],
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})(<a-input />)}
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</a-form-item>
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</a-form>
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)
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},
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})
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export default {
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data () {
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return {
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fields: {
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username: {
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value: 'benjycui',
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},
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},
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}
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},
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methods: {
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handleFormChange (changedFields) {
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this.fields = { ...this.fields, ...changedFields }
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},
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},
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render () {
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const fields = this.fields
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return (
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<div id='components-form-demo-global-state'>
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<CustomizedForm {...{ props: fields }} onChange={this.handleFormChange} />
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<pre class='language-bash'>
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{JSON.stringify(fields, null, 2)}
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</pre>
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</div>
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)
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},
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}
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</script>
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<style>
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#components-form-demo-global-state .language-bash {
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max-width: 400px;
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border-radius: 6px;
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margin-top: 24px;
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}
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</style>
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