using css modules in react how can I pass a className as a prop to a component

Question

If I have a react component and I want to pass in a className, how do I do this with CSS Modules. It currently just gives the className but not the hash generated css module name which I would get for <div className={styles.tile + ' ' + styles.blue}>

Here is my Tile.js component

import React, { Component } from 'react';

import styles from './Tile.css';

class Tile extends Component {

  render() {

    return (
      <div className={styles.tile + ' ' + this.props.color}>
        {this.props.children}
      </div>
    );
  }
};

export default Tile;

Tile.css

@value colors: "../../styles/colors.css";
@value blue, black, red from colors;

.tile {
    position: relative;
    width: 100%;
    padding-bottom: 100%;
}

.black {
  background-color: black;
}

.blue {
  background-color: blue;
}

.red {
  background-color: red;
}

So as you can see I initialize this Tile wrapper component as follows in my Author Tile, but I want to pass a color prop into the component:

AuthorTile.js

return (
  <Tile orientation='blue'>
   <p>{this.props.title}</p>
   <img src={this.props.image} />
  </Tile>
);

romseguy · Accepted Answer · 2015-12-03T08:47:36.977

25

From the docs:

Avoid using multiple CSS Modules to describe a single element. https://github.com/gajus/react-css-modules#multiple-css-modules

@value colors: "../../styles/colors.css";
@value blue, black, red from colors;

.tile {
    position: relative;
    width: 100%;
    padding-bottom: 100%;
}

.black {
    composes: tile;
    background-color: black;
}

.blue {
    composes: tile;
    background-color: blue;
}

.red {
    composes: tile;
    background-color: red;
}

Then <div className={styles[this.props.color]} should do the job, e.g:

render: function(){
  // ES2015
  const className = styles[this.props.color];

  // ES5
  var className = '';

  if (this.props.color === 'black') {
    className = styles.black;
  }

  return (
    <div className={className}>
      {this.props.children}
    </div>
}

edited Dec 03 '15 at 08:47

answered Dec 02 '15 at 06:16

romseguy

1,535
13
17

1

How do you propose having multiple color backgrounds for this Tile component, which can be defined when you initialize it? – svnm Dec 02 '15 at 06:18
What you have done is not a bad approach to using composition with css modules, but still my main concern is how do I use the passes in color for the Tile, e.g. `` How does this translate in the Tile? `
` is not going to work because it expects `{styles.blue}` not `blue` which would become something like `components_Tile__blue__abc5436`
– svnm Dec 02 '15 at 06:23
3

If you're using ES2015 `
– romseguy Dec 02 '15 at 17:29
`
– svnm Dec 02 '15 at 22:04
1

if I am using ES5 or 6 and I have e.g. 10 classnames, do I have to check through all of them to create the right styles.x ? Isn't there any better way to solve this problem? – Karl Hofmann Jan 18 '19 at 19:07
what if I have more than 2 states, eg: `tile` `blue` `selected` ? – eagor Jan 19 '20 at 10:41

using css modules in react how can I pass a className as a prop to a component

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