Multiple Props Options for Styled Components

问题

I have a navbar component that I have created using Styled Components. I would like to create some props that change the background-color and/or text color.

For instance: <Navbar dark> should have the following CSS:

background: #454545;
color: #fafafa;

Whereas <Navbar light> should be the opposite:

background: #fafafa;
color: #454545;

If, however, neither prop is used, then I want to have a default background and text color -- say (for demo purposes), something like this:

background: #eee;
color: #333;

Now, my question is how to set this up in Styled Components.

I can do the following:

background: ${props => props.dark ? #454545 : '#eee'}
background: ${props => props.dark ? #fafafa : '#eee'}
background:  #eee;

And something similar for color.

But this is redundant and not very elegant. I would like some sort of if/else statement:

background: ${ props => { 
  if (props.dark) { #454545 }
  elseif (props.light) { #fafafa }
  else { #eee }
}

But I don't know how to set something like that up in Styled Components.

Any suggestions?

Thanks in advance.

回答1:

Keep the passed in prop name the same. Then you can utilize a switch/case statement. For example, passing in a color prop and using it as a type to be matched against a case.

Working example:

---

For example:

<Button color="primary">Example</Button>

components/Button

import styled from "styled-components";

const handleColorType = color => {
  switch (color) {
    case "primary":
      return "#03a9f3";
    case "danger":
      return "#f56342";
    default:
      return "#fff";
  }
};

const Button = styled.button`
  display: block;
  cursor: pointer;
  border: 0;
  margin: 5px 0;
  background: #000;
  font-size: 20px;
  color: ${({ color }) => handleColorType(color)};

  &:focus {
    outline: 0;
  }
`;

export default Button;

---

If you have multiple attributes (like a color and a background pair), then utilizing the same concept as above, alter the handleColorType to return a string with attributes and invoke the handleColorType function without a style property.

For example:

<MultiButton color="primary">Example</MultiButton>

components/MultiButton

import styled from "styled-components";

const handleColorType = color => {
  switch (color) {
    case "primary":
      return "color: #03a9f3; background: #000;";
    case "danger":
      return "color: #fff; background: #f56342;";
    default:
      return "color: #000; background: #eee;";
  }
};

const MultiButton = styled.button`
  display: block;
  margin: 5px 0;
  cursor: pointer;
  border: 0;
  font-size: 20px;
  ${({ color }) => handleColorType(color)};

  &:focus {
    outline: 0;
  }
`;

export default MultiButton;

回答2:

This is the solution I ended up using:

export const Navbar = styled.nav`
  width: 100%;

  ...  // rest of the regular CSS code

  ${props => {
    if (props.dark) {
      return `
        background: ${colors.dark};
        color: ${colors.light};
    `
    } else if (props.light) {
      return `
        background: ${colors.light};
        color: ${colors.dark};
    `
    } else {
      return `
        background: ${colors.light};
        color: ${colors.dark};
    `
    }
  }}
`

回答3:

you can also do something like this:

 const colorType= {
   dark: '#454545',
   light: '#0a0a0a',
   normal: '#dedede'
};



export const Navbar= styled.nav`
   background: ${({color}) => colorType[color] || `${color}`};

`;

and Here you are :

<Navbar color="primary" />
<Navbar color="#FFFFFF" />

回答4:

Something more elegant (I guess) and modern would be a combination of destructuring the props and using the switch statement such as:

const Button = styled.button`
  ${({primary, secondary}) => {
      switch(true) {
        case primary:
          return `background-color : green`
        case secondary:
          return `background-color : red`
      }
    }
  }
`

回答5:

Styled components also accepts a function where in you can read props. Moreover if you choose to pass a theme prop instead, you can also define an object for your themes.

const themes = {
  dark: css `
     background: ${colors.dark};
     color: ${colors.light};
  `,
  light: css`
     background: ${colors.light};
     color: ${colors.dark};
  `
}
export const Navbar = styled.nav(({theme})=>`
  width: 100%;
  background: ${colors.light};
  color: ${colors.dark};
  ... // rest of the css

  ${theme?themes[theme]:''}

  `)

<Navbar theme="dark" />

来源：https://stackoverflow.com/questions/56047659/multiple-props-options-for-styled-components