reactjs - Styled Components 基于 props 渲染 Styled 标签

Question

我正在构建一个应用程序并希望拥有 Primary、Secondary 和 Tertiary 按钮，我不想创建 3 个单独的组件，它们相同但具有不同的样式组件，所以我想有条件地显示正确的标签，如下面的代码，但我收到一个错误 JSX 元素类型“ButtonStyles”没有任何构造或调用签名。我究竟做错了什么？谢谢

import React from "react";
import styled from "styled-components";

const PrimaryStyles = styled.button`
  width: 26rem;
  height: 5rem;
  background-image: ${({ theme }) => theme.gradients.ry};
  border: none;
  border-radius: 4px;
  color: ${({ theme }) => theme.black};
  font-size: 2rem;
  box-shadow: 3px 3px 30px ${({ theme }) => theme.red + "70"};
  cursor: pointer;
  padding: 0 1rem;
`;

const SecondaryStyles = styled.button``;

const TertiaryStyles = styled.button`
  border: none;
  background: none;
  color: ${({ theme }) => theme.grey};
`;

interface IProps {
  type: "button" | "reset" | "submit";
  children: React.ReactNode;
  onClick: React.MouseEventHandler<HTMLButtonElement>;
  primary?: boolean;
  secondary?: boolean;
  tertiary?: boolean;
}
export const Button: React.FC<IProps> = ({
  children,
  onClick,
  type,
  primary = true,
  secondary,
  tertiary,
}) => {
  const ButtonStyles = primary
    ? PrimaryStyles
    : secondary
    ? SecondaryStyles
    : tertiary
    ? TertiaryStyles
    : null;
  return (
    <ButtonStyles type={type} onClick={onClick}>
      {children}
    </ButtonStyles>
  );
};

标签： reactjstypescriptstyled-componentstsx

Answer 1

那是因为这个逻辑：

const ButtonStyles = primary
    ? PrimaryStyles
    : secondary
    ? SecondaryStyles
    : tertiary
    ? TertiaryStyles
    : null;

如果不是primary，secondary或者tertiary它将是null。所以你的代码将设置ButtonStyles为NULL然后你不能这样做：

 return (
    <ButtonStyles type={type} onClick={onClick}>
      {children}
    </ButtonStyles>
  );

对此的解决方案是删除该NULL选项，例如：

const ButtonStyles = primary
    ? PrimaryStyles
    : secondary
    ? SecondaryStyles
    : TertiaryStyles;

另一种避免三元条件运算符的方法是这样做：

1. 创建一个包含 3 个样式选项的对象：

interface IButtonStyles {
  [key: string]: StyledComponent<"button", any, {}, never>;
}

const buttonStyleTypes: IButtonStyles = {
  primary: PrimaryStyles,
  secondary: SecondaryStyles,
  tertiary: TertiaryStyles,
};

2. 将您的 IProps 更改为以下内容：

interface IProps {
  type: "button" | "reset" | "submit";
  children: React.ReactNode;
  onClick: React.MouseEventHandler<HTMLButtonElement>;
  styleType?: string;
}

3. Button 组件对此：

const Button: React.FC<IProps> = ({
  children,
  type,
  styleType = "primary",
}) => {

  const ButtonStyles = buttonStyleTypes[styleType];

  return <ButtonStyles type={type}>{children}</ButtonStyles>;
};

4. 最后，您可以像这样创建按钮：

<Button type={"button"}>primary</Button>
<Button type={"button"} styleType='secondary'>secondary</Button>
<Button type={"button"} styleType='tertiary'>tertiary</Button>