import React from 'react';
import CSSX from 'react-cssx';

class Component extends React.Component {
  render() {
    return (
      <CSSX styles={ this.css() }>
        <h1>Title styled with <i>CSSX</i></h1>
      </CSSX>
    );
  }
  css() {
    var color = '#BADA55';

    return (
      <style>
        h1 {
          color: {{ color }};
        }
        h1 i {
          text-decoration: underline;
        }
      </style>
    );
  }
}

To make the code above works you'll need:

CSSX component (npm install react-cssx)
CSSX transpiler (It's available here. Get it as a webpack loader or gulp plugin.)

Demo here and here.

CSSX component

<CSSX> component requires only one attribute - styles. It should be an array in the following format:

[
  ['h1', { 'font-size': '32px' }],
  ['h1 small', { 'font-size': '24px', 'font-weight': 'bold' }]
]

Of course writing CSS that way is not really nice. So let's use CSSX and replace it with:

css() {
  return (
    <style>
      h1 {
        font-size: 32px;
      }
      h1 small {
        font-size: 24px;
        font-weight: bold;
      }
    </style>
  );
}

Notice that we should use a function that returns a <style> tag. If we create the <style> tag directly (in the render method for example) we'll get the CSS applied straight away to the whole page.

Scoping

If you check some of the examples in a browser you'll see that the created styles are scoped to a specific element. For example:

class Component extends React.Component {
  render() {
    return (
      <section>
        <p>First paragraph</p>
        <CSSX styles={ this.styleParagraph('#F00', 'second') }>
          <p>Second paragraph</p>
        </CSSX>
        <CSSX styles={ this.styleParagraph('#00F', 'third') }>
          <p>Third paragraph</p>
        </CSSX>
      </section>
    );
  }
  styleParagraph(color, text) {
    return (
      <style>
        p {
          color: {{ color }};
        }
        p::before { 
          content: {{ text }};
        }
      </style>
    );
  }
}

There are three paragraphs rendered on the screen:

CSSX

The first one does not have any local styles attached. However, the second and the third one are styled differently. They have their own dedicated CSS. CSSX library creates two <style> tags in the <head> of the document.

CSSX

Misc

If this sounds interesting to you follow the links below:

Keywords

react

css

cssx

FAQs

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Package last updated on 20 Apr 2016

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