打字稿:如何在React Component中设置子类型?

时间:2016-03-18 13:01:46

标签: reactjs typescript react-jsx

我可以在TypeScript中设置子类型吗?

例如我有这样的组件

class UserProfile extends React.Component<{ id: number }, void>{
}

class Thumbnail extends React.Component<{ children: UserProfile[] }, void>{

}

class UsersList extends React.Component<void, void>{

    public render() {
        return (
            <div>
                <Thumbnail><UserProfile id={1} /></Thumbnail>
                <Thumbnail><UserProfile id={2} /></Thumbnail>
            </div>
        )
    }
}

我想定义缩略图组件中支持的特定子项,以避免出现这种情况:

class UsersList extends React.Component<void, void>{

    public render() {
        return (
            <div>
                <Thumbnail><UserProfile id={1} /></Thumbnail>
                <Thumbnail><UserProfile id={2} /></Thumbnail>
                <Thumbnail><span>Some plain text</span></Thumbnail> // This should be forbidden because Thumbnail component expects to have an array of UserProfile elements as it can handle them
            </div>
        )
    }
}

这个例子不起作用,但是有什么方法可以做到吗?

1 个答案:

答案 0 :(得分:3)

  

在React Component中设置子类型?

不能使用类型注释(它的所有JSX.Element)缩小范围。可以使用运行时内省(每个子项的test_input <- structure(list(ID = c(1L, 1L, 1L, 1L, 2L, 2L), Category = c("X", "X", "X", "X", "X", "X"), ItemId_na = c(2L, 2L, 2L, 2L, 3L, 3L ), Item.Type1_na = c(1L, 2L, 3L, 4L, 1L, 2L)), .Names = c("ID", "Category", "ItemId_na", "Item.Type1_na"), row.names = c(NA, 6L), class = "data.frame") 属性)来完成。