渲染组件时如何利用点符号? [英] How do I utilize dot notation when rendering components?

问题描述

我有一个简单的组件，应该将不同类型的字段呈现给表单组件:

I have a simple component which is supposed to render different kind of fields into my form component:

import React from "react";

export default class Field extends React.Component {

  render() {
    switch (this.props.type) {
      case 'textarea': {
        return (
          <div className="col-xs-12">
            <textarea
              placeholder={this.props.placeholder}
              name={this.props.name}
            >
            </textarea>
          </div>
          )
      }
      case 'text': {
        return (
          <div className="col-md-6 col-lg-4">
            <input
              type="text"
              placeholder={this.props.placeholder}
              name={this.props.name}
            />
          </div>
        )
      }
    }
  }
}

我正在这样的表单组件中使用此组件:

And I'm using this component in my form component like this:

export default class SubmitForm extends React.Component {

  render() {
    return (
        .
        .
        .
        <Field
          type="text"
          placeholder="something"
          name="something"
        />
        <Field
          type="textarea"
          placeholder="another"
          name="othername"
        />
        .
        .
        .
    )
  }
}

我要想到的是按照某种方式实现我的字段组件，以能够使用点表示法，如

What I have in mind is to somehow implement my field component to be able to use dot notation as explained in Using Dot Notation for JSX components which I have seen many other libraries and I want to be able to use this component like this:

<Field.Text name="sth" placeholder="sth" />
<Field.TextArea name="other" placeholder="other stuff" /> 

但是我无法按照React文档中提到的方式进行操作.我该怎么办?

But I can't do it the way mentioned in React docs. How can I do this?

推荐答案

只需创建单个组件并以以下名称导出它们:

Just create individual components and export them under names:

//Field.js
class TextArea extends React.Component {
  ...
}

class Text extends React.Component {
  ...
}

export { Text, TextArea };

然后从模块中导入所有名称:

Then import all the names from the module:

import * as Field from './path/to/Field.js';

或者，如果您希望像这样导出默认对象(这正是文档中的示例所执行的操作，只是以另一种方式):

Or if you prefer exporting a default object like so (which is exactly what the example from the documentation is doing, just in a different way):

export default { Text, TextArea };

将使用对象速记属性并导出默认成员-对象文字.然后，您可以像这样导入它:

Which will use object shorthand properties and export a default member -- an object literal. Then you can import it like so:

import Field from './path/to/Field.js';

最后:

<Field.TextArea ... />

或者，要摆脱点符号(您不能使用默认的导出选项来做到这一点！):

Or, to get rid of dot notation (you can't do this with the default export option!):

import { Text, TextArea } from './path/to/Field.js';

<Text ... />
<TextArea ... />

当然，完全可以通过React文档，使用类表达式进行操作:

Of course, going exactly by the React documentation, you could do, with class expressions:

const Field = {
  Text: class Text extends React.Component { //you can omit the class name here
    //can be stateless functional component if you don't need state
  },
  TextArea: class TextArea extends React.Component {

  }
}

export default Field;

然后作为默认成员导入并使用点符号.

Then importing as a default member and using dot notation.

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