ant-design/components/form/demo/complex-form-control.md

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## zh-CN
这里演示 `Form.Item` 内有多个元素的使用方式。`<Form.Item name="field" />` 只会对它的直接子元素绑定表单功能,例如直接包裹了 Input/Select。如果控件前后还有一些文案或样式装点或者一个表单项内有多个控件你可以使用内嵌的 `Form.Item` 完成。你可以给 `Form.Item` 自定义 `style` 进行内联布局,或者添加 `noStyle` 作为纯粹的无样式绑定组件(类似 3.x 中的 `getFieldDecorator`)。
```diff
- <Form.Item label="Field" name="field">
- <Input />
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- </Form.Item>
+ <Form.Item label="Field">
+ <Form.Item name="field" noStyle><Input /></Form.Item> // 直接包裹才会绑定表单
+ <span>description</span>
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+ </Form.Item>
```
这里展示了三种典型场景:
- `Username`:输入框后面有描述文案或其他组件,在 `Form.Item` 内使用 `<Form.Item name="field" noStyle />` 去绑定对应子控件。
- `Address`:有两个控件,在 `Form.Item` 内使用两个 `<Form.Item name="field" noStyle />` 分别绑定对应控件。
- `BirthDate`:有两个内联控件,错误信息展示各自控件下,使用两个 `<Form.Item name="field" />` 分别绑定对应控件,并修改 `style` 使其内联布局。
> 注意,在 label 对应的 Form.Item 上不要在指定 `name` 属性,这个 Item 只作为布局作用。
更复杂的封装复用方式可以参考下面的 `自定义表单控件` 演示。
## en-US
This demo shows how to use `Form.Item` with multiple controls. `<Form.Item name="field" />` will only bind the control(Input/Select) which is the only children of it. Imagine this case: you added some text description after the Input, then you have to wrap the Input by an extra `<Form.Item name="field">`. `style` property of `Form.Item` could be useful to modify the nested form item layout, or use `<Form.Item noStyle />` to turn it into a pure form-binded component(like `getFieldDecorator` in 3.x).
```diff
- <Form.Item label="Field" name="field">
- <Input />
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- </Form.Item>
+ <Form.Item label="Field">
+ <Form.Item name="field" noStyle><Input /></Form.Item> // that will bind input
+ <span>description</span>
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+ </Form.Item>
```
This demo shows three typical usages:
- `Username`: extra elements after control, using `<Form.Item name="field" noStyle />` inside `Form.Item` to bind Input.
- `Address`: two controls in one line, using two `<Form.Item name="field" noStyle />` to bind each control.
- `BirthDate`two controls in one line with independent error message, using two `<Form.Item name="field" noStyle />` to bind each control, make layout inline by customizing `style` property.
> Note that, in this case, no more `name` property should be left in Form.Item with label.
See the `Customized Form Controls` demo below for more advanced usage.