styled-components is the result of wondering how we could enhance CSS for styling React component systems. By focusing on a single use case we managed to optimize the experience for developers as well as the output for end users.
Apart from the improved experience for developers, styled-components provides:
You get all of these benefits while still writing the CSS you know and love, just bound to individual components.
Installing styled-components only takes a single command and you're ready to roll:
It's highly recommended (but not required) to also use the Babel plugin. It offers many benefits like more legible class names, server-side rendering compatibility, smaller bundles, and more.
If you're not using a module bundler or package manager we also have a global ("UMD") build hosted on the unpkg CDN. Simply add the following <script> tag to the bottom of your HTML file:
Once you've added styled-components you will have access to the global window.styled variable.
styled-components utilises tagged template literals to style your components.
It removes the mapping between components and styles. This means that when you're defining your styles, you're actually creating a normal React component, that has your styles attached to it.
This example creates two simple components, a wrapper and a title, with some styles attached to it:
This is a live editor, so play around with the code to get a feel for what it's like to work with styled-components!
The CSS rules are automatically vendor prefixed, styled-components takes care of that for you!
You can pass a function ("interpolations") to a styled component's template literal to adapt it based on its props.
This button component has a primary state that changes its color. When setting the primary prop to true, we are swapping out its background and text color.
Quite frequently you might want to use a component, but change it slightly for a single case. Now, you could pass in an interpolated function and change them based on some props, but that's quite a lot of effort for overriding the styles once.
To easily make a new component that inherits the styling of another, just wrap it in the styled() constructor. Here we use the button from the last section and create a special one, extending it with some color-related styling:
We can see that the new TomatoButton still resembles Button, while we have only added two new rules.
In some cases you might want to change which tag or component a styled component renders. This is common when building a navigation bar for example, where there are a mix of anchor links and buttons but they should be styled identically.
For this situation, we have an escape hatch. You can use the "as" polymorphic prop to dynamically swap out the element that receives the styles you wrote:
This works perfectly fine with custom components too!
If you are still on an older version than v4, you can use the .withComponent or .extend API's to achieve the same result as with the "as" prop, but note that this is discouraged as with v4 .extend was removed and .withComponent was marked as a candidate for future deprecation.
The styled method works perfectly on all of your own or any third-party component, as long as they attach the passed className prop to a DOM element.
If you are using react-native keep in mind to use style instead of className.
You can also pass tag names into the styled() factory call, like so: styled("div"). In fact, the styled.tagname helpers are just aliases that do the same.
If the styled target is a simple element (e.g. styled.div), styled-components passes through any known HTML attribute to the DOM. If it is a custom React component (e.g. styled(MyComponent)), styled-components passes through all props.
This example shows how all props of the Input component are passed on to the DOM node that is mounted, as with React elements.
Note how the inputColor prop is not passed to the DOM, but type and defaultValue are. That is styled-components being smart enough to filter non-standard attributes automatically for you.
If you're familiar with importing CSS into your components (e.g. like CSSModules) you'll be used to doing something like this:
Because a Styled Component is the combination of the element and the rules that style it, we'd write Counter like this:
Note that we added a "Styled" prefix to StyledCounter so that the React component Counter and the Styled Component StyledCounter don't clash names but remain easily identifiable in the React Developer Tools and Web Inspector.
It is important to define your styled components outside of the render method, otherwise it will be recreated on every single render pass. Defining a styled component within the render method will thwart caching and drastically slow down rendering speed, and should be avoided.
Write your styled components the recommended way:
The preprocessor we use, stylis, supports scss-like syntax for automatically nesting styles.
The ampersand (&) can be used to refer back to the main component. Here are some more examples of its potential usage:
Hello world!How ya doing?The sun is shining...Pretty nice day today.Don't you think?Splendid.
If you put selectors in without the ampersand, they will refer to children of the component.
Finally, the ampersand can be used to increase the specificity of rules on the component; this can be useful if you are dealing with a mixed styled-components and vanilla CSS environment where there might be conflicting styles:
I'm blue, da ba dee da ba daa
To avoid unnecessary wrappers that just pass on some props to the rendered component, or element, you can use the .attrs constructor. It allows you to attach additional props (or "attributes") to a component.
This way you can for example attach static props to an element, or pass a third-party prop like activeClassName to React Router's Link component. Furthermore you can also attach more dynamic props to a component. The .attrs object also takes functions, that receive the props that the component receives. The return value will be merged into the resulting props as well.
Here we render an Input component and attach some dynamic and static attributes to it:
As you can see, we get access to our newly created props in the interpolations, and the type attribute is passed down to the element.
CSS animations with @keyframes aren't scoped to a single component but you still don't want them to be global to avoid name collisions. This is why we export a keyframes helper which will generate a unique instance that you can use throughout your app:
< 💅🏾 >
Keyframes are not supported by react-native. Instead, use the ReactNative.Animated API.
Keyframes are lazily injected when they're used, which is how they can be code-splitted, so you have to use the css helper for shared style fragments:
This used to work in v3 and below where we didn't code-split keyframes. If you're upgrading from v3, make sure that all your shared style fragments are using the css helper!
styled-components can be used with React Native in the same way and with the same import. Try this example with Snack by Expo.
We also support more complex styles (like transform), which would normally be an array, and shorthands (e.g. for margin) thanks to css-to-react-native!
Note that the flex property works like CSS shorthand, and not the legacy flex property in React Native. Setting flex: 1 sets flexShrink to 1 in addition to setting flexGrow to 1 and flexBasis to 0.
Imagine how you'd write the property in React Native, guess how you'd transfer it to CSS, and you're probably right:
Some of the differences to the web-version are, that you cannot use the keyframes and createGlobalStyle helpers since React Native doesn't support keyframes or global styles. We will also warn you if you use media queries or nest your CSS.
In v2 we support percentages. To make this possible we need to enforce units for all shorthands. If you're migrating to v2, a codemod is available.
If you'd prefer to just import styled-components instead of styled-components/native, you can add a resolverMainFields configuration that includes "react-native". This used to be supported in metro by default (and currently does work in haul) but appears to have been removed at some point.