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A Pure ReactJS Carousel Component
Maintained by @sarmeyer
To add nuka-carousel
to your project run the following command in your project folder.
$ yarn add nuka-carousel
import React from 'react';
import Carousel from 'nuka-carousel';
export default class extends React.Component {
render() {
return (
<Carousel>
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide1" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide2" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide3" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide4" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide5" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide6" />
</Carousel>
);
}
}
The demo can be launched on your local machine via webpack-dev-server
. Make sure you are running node version 9.11 or earlier. Once you have cloned this repo locally, run the following:
yarn
yarn build
yarn start
You can access the application on your localhost at the following url: Local Demo
Key Combination | Function |
---|---|
Right/Up Arrow or D/W key | Next slide |
Left/Down Arrow or A/S key | Previous slide |
Q key | First slide |
E key | Last slide |
SpaceBar | When autoplay={true} pauses and unpauses carousel |
enableKeyboardControls
prop to true
.keyCodeConfig
prop can be used to configure the default keyCodesName | PropType | Description | Default |
---|---|---|---|
afterSlide | React.PropTypes.func |
Hook to be called after a slide is changed. | |
animation | React.PropTypes.oneOf(['zoom']) |
Adds a zoom effect on the currently visible slide. A transform: scale(0.85) is set as default, however, the scale can be customized using zoomScale prop. Property is applied on all slides except the current 1. Use cellAlign to align the slide with zoom effect where you’d like. |
|
autoGenerateStyleTag | React.PropTypes.bool |
When set to true , it will generate a style tag to help ensure images are displayed properly. Set to false if you don’t want or need the style tag generated. |
true |
autoplay | React.PropTypes.bool |
Autoplay mode active. | false |
autoplayInterval | React.PropTypes.number |
Interval for autoplay iteration. | 3000 milliseconds |
autoplayReverse | React.PropTypes.bool |
Only meaningful when autoplay is already true. When autoplayReverse is also true, autorotation cycles through slides indexes from high to low. |
false |
beforeSlide | React.PropTypes.func |
Hook to be called before a slide is changed | |
cellAlign | React.PropTypes.oneOf(['left', 'center', 'right']) |
When displaying more than one slide, sets which position to anchor the current slide to. Is overridden to left when transitionMode="fade" |
|
cellSpacing | React.PropTypes.number |
Space between slides, as an integer, but reflected as px |
|
enableKeyboardControls | React.PropTypes.bool |
When set to true will enable keyboard controls when the carousel has focus. If the carousel does not have focus, keyboard controls will be ignored. |
false |
keyCodeConfig | PropTypes.exact({ previousSlide: PropTypes.arrayOf(PropTypes.number), nextSlide: PropTypes.arrayOf(PropTypes.number), firstSlide: PropTypes.arrayOf(PropTypes.number), lastSlide: PropTypes.arrayOf(PropTypes.number), pause: PropTypes.arrayOf(PropTypes.number) }) |
If enableKeyboardControls prop is true, you can pass configuration for the keyCode so you can override the default keyboard keys configured. |
{ nextSlide: [39, 68, 38, 87], previousSlide: [37, 65, 40, 83], firstSlide: [81], lastSlide: [69], pause: [32] } |
getControlsContainerStyles | React.PropTypes.func |
callback function to provide style to controls containers | |
defaultControlsConfig | React.PropTypes.shape({ containerClassName: PropTypes.string, nextButtonClassName: PropTypes.string, nextButtonStyle: Proptypes.object, nextButtonText: PropTypes.string, prevButtonClassName: PropTypes.string, prevButtonStyle: PropTypes.object, prevButtonText: PropTypes.string, pagingDotsContainerClassName: PropTypes.string, pagingDotsClassName: PropTypes.string, pagingDotsStyle: PropTypes.object }) |
This prop lets you apply custom classes and styles to the default Container . Next , Previous , and Paging Dots controls. More information on how to customize these controls can be found below. |
{} |
disableAnimation | React.PropTypes.bool |
When set to true , will disable animation. |
false |
disableEdgeSwiping | React.PropTypes.bool |
When set to true , will disable swiping before first slide and after last slide. |
false |
dragging | React.PropTypes.bool |
Enable mouse swipe/dragging. | true |
easing | React.PropTypes.string |
Animation easing function. See valid easings here: D3 Easing Functions | |
edgeEasing | React.PropTypes.string |
Animation easing function when swipe exceeds edge. See valid easings here: D3 Easing Functions | |
frameOverflow | React.PropTypes.string |
Used to set overflow style property on slider frame. | hidden |
framePadding | React.PropTypes.string |
Used to set the margin of the slider frame. Accepts any string dimension value such as "0px 20px" or "500px" |
|
heightMode | React.PropTypes.oneOf(['first', 'current', 'max']) |
Change the height of the slides based either on the first slide, the current slide, or the maximum height of all slides. Overrides height set by initialSlideHeight |
|
innerRef | React.PropTypes.oneOfType([ React.PropTypes.func, React.PropTypes.shape({ current: React.PropTypes.elementType })]) |
React ref that should be set on the carousel element |
|
initialSlideHeight | React.PropTypes.number |
Initial height of the slides in pixels. | 100 |
initialSlideWidth | React.PropTypes.number |
Initial width of the slides in pixels | |
pauseOnHover | React.PropTypes.bool |
Pause autoPlay when mouse is over carousel. | true |
renderAnnounceSlideMessage | React.PropTypes.func |
Renders message in the ARIA live region that is announcing the current slide on slide change | Render function that returns "Slide {currentSlide + 1} of {slideCount}" |
scrollMode | React.PropTypes.oneOf(['page', 'remainder']) |
When scrollMode is set to remainder , the carousel will only scroll the amount of slides necessary without showing blank slides. If scrollMode is set to page then slidesToScroll will equal slidesToShow and the final page may contain blank slides. |
remainder |
slideIndex | React.PropTypes.number |
Manually set the index of the slide to be shown | |
slideOffset | React.PropTypes.number |
While using prop animation = "zoom" , you can configure space around current slide with slideOffset. |
25 |
slidesToScroll | React.PropTypes.oneOfType([ React.PropTypes.number, React.PropTypes.oneOf(['auto'])]) |
Slides to scroll at once. Set to "auto" to always scroll the current number of visible slides. Is overridden to slidesToShow when transitionMode="fade" |
|
slidesToShow | React.PropTypes.number |
Number of slides to show at once. Will be cast to an integer when transitionMode="fade" |
|
slideWidth | React.PropTypes.oneOfType([React.PropTypes.string, React.PropTypes.number]) |
Manually set slideWidth. If you want hard pixel widths, use a string like slideWidth="20px" , and if you prefer a percentage of the container, use a decimal integer like slideWidth={0.8} |
|
speed | React.PropTypes.number |
Animation duration/Transition speed in milliseconds | |
swiping | React.PropTypes.bool |
Enable touch swipe/dragging | true |
transitionMode | React.PropTypes.oneOf(['scroll', 'fade', 'scroll3d']) |
Set the way slides transition from one to the next. | scroll |
vertical | React.PropTypes.bool |
Enable the slides to transition vertically | |
width | React.PropTypes.string |
Used to hardcode the slider width. Accepts any string dimension value such as "80%" or "500px" |
|
withoutControls | React.PropTypes.bool |
Used to remove all controls at once. Overwrites the render[Top, Right, Bottom, Left]CenterControls() . |
false |
wrapAround | React.PropTypes.bool |
Sets infinite wrapAround mode. An option similar to repeat or infinite in other libs. | false |
zoomScale | React.PropTypes.number |
Adds a number value to set the scale of zoom when animation === "zoom" . The number value should be set in a range of (0,1). The default value is set to zoomScale: 0.85 |
|
opacityScale | React.PropTypes.number |
Adds a number value to set the scale of the opacity for the ‘scroll3d’ transition mode. The number value should be set in a range of (0,1). The default value is set to opacityScale: 0.65 |
|
onDragStart | React.PropTypes.func |
Adds a callback to capture event at the start of swiping/dragging slides |
React.PropTypes.func
A set of eight render props for rendering controls in different positions around the carousel.
Valid render props for the eight positions are renderTopLeftControls
, renderTopCenterControls
, renderTopRightControls
, renderCenterLeftControls
, renderCenterCenterControls
, renderCenterRightControls
, renderBottomLeftControls
, renderBottomCenterControls
, and renderBottomRightControls
.
The default props are set as renderCenterLeftControls
for Previous
button, renderCenterRightControls
for the Next
button and renderBottomCenterControls
for the “Paging dots”. To change the position or remove “Paging dots”, the default positions need to be disabled by setting them to null.
<Carousel
renderTopCenterControls={({ currentSlide }) => (
<div>Slide: {currentSlide}</div>
)}
renderCenterLeftControls={({ previousSlide }) => (
<button onClick={previousSlide}>Previous</button>
)}
renderCenterRightControls={({ nextSlide }) => (
<button onClick={nextSlide}>Next</button>
)}
>
{/* Carousel Content */}
</Carousel>
The function returns the props for goToSlide
, nextSlide
and previousSlide
functions in addition to slideCount
and currentSlide
values. Can also remove all render controls using withoutControls
.
NOTE: The className slide-visible
is added to the currently visible slide or slides (when slidesToShow > 1). The className slide-current
is added to the currently “active” slide.
React.PropTypes.func
renderAnnounceSlideMessage
render prop is a special case of the render*Controls
props. It’s responsibility is to render ARIA live announcement message to improve accessibility. The prop will announce the message you pass in every time the slide changes with VoiceOver
enabled on your machine. The function returns only slideCount
and currentSlide
values.
<Carousel
renderAnnounceSlideMessage={({ currentSlide, slideCount }) =>
`Slide ${currentSlide + 1} of ${slideCount}`
}
>
{/* Carousel Content */}
</Carousel>
React.PropTypes.func
getControlsContainerStyles
is a function prop that will be called with a key argument being one of the following: TopLeft
| TopCenter
| TopRight
| CenterLeft
| CenterCenter
| CenterRight
| BottomLeft
| BottomCenter
| BottomRight
. The function will then return CSS Properties.
<Carousel
getControlsContainerStyles={(key) => {
switch (key) {
case 'TopLeft':
return {
backgroundColor: "red",
};
default:
// will apply all other keys
return {
backgroundColor: "blue",
};
}
}} />
>
{/* Carousel Content */}
</Carousel>
React.PropTypes.shape({
nextButtonClassName: PropTypes.string,
nextButtonStyle: PropTypes.object,
nextButtonText: PropTypes.string,
prevButtonClassName: PropTypes.string,
prevButtonStyle: PropTypes.object,
prevButtonText: PropTypes.string,
pagingDotsContainerClassName: PropTypes.string,
pagingDotsClassName: PropTypes.string,
pagingDotsStyle: PropTypes.object
})
The default controls used by Nuka are the Previous
button, Next
button, and PagingDots
control. The visual look and text of these controls can be modified with props as described below:
ClassName
let you apply a custom css class to its respective control.Style
let you apply inline styles to its respective control.Previous
button and Next
button can be customized using prevButtonText
and nextButtonText
, respectively.Example, you can change the text of the Previous
and Next
buttons, and change the paging dots to red by passing in the following configuration:
defaultControlsConfig={{
nextButtonText: 'Custom Next',
prevButtonText: 'Custom Prev',
pagingDotsStyle: {
fill: 'red'
}
}}
You can control the state of the carousel from your parent component as shown below:
import React from 'react';
import Carousel from 'nuka-carousel';
export default class extends React.Component {
state = {
slideIndex: 0
};
render() {
return (
<Carousel
slideIndex={this.state.slideIndex}
afterSlide={slideIndex => this.setState({ slideIndex })}
>
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide1" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide2" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide3" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide4" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide5" />
<img src="https://via.placeholder.com/400/ffffff/c0392b/&text=slide6" />
</Carousel>
);
}
}
TypeScript type definitions are now shipped with nuka-carousel. You can use them directly from the library.
In componentDidMount, the initial dimensions are assigned to each slide:
initialSlidewidth
|| slideWidth
|| (slidesToShow
/ width of container)initialSlideHeight
After the component completes mounting with the accurate width, it tries to calculate the desired height of the content (current
, first
, max
). If that calculation fails (perhaps because slide images are still loading), it’ll wait a bit and try again. Once successful, that measurement then replaces initialSlideHeight
with the measured height in pixels.
See the Contribution Docs.
Active: Formidable is actively working on this project, and we expect to continue for work for the foreseeable future. Bug reports, feature requests and pull requests are welcome.
Author: FormidableLabs
Source Code: https://github.com/FormidableLabs/nuka-carousel
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In this article we will learn about the different types of react components, and what are the differences in between the components (functional, class and pure components).
React components let you split the UI into independent, reusable pieces, and think about each piece in isolation. React components can be defined by subclassing React.Component or React.PureComponent as per react official doc.
Functional Components
A Functional component is the simplest way to define a component in ReactJs, it’s a simple javascript function which returns a React element. Functional components are also known as stateless components.
Let’s understand with an example of a Functional Component
import React from 'react';
function App() {
const greeting = 'Hello Functional Component!';
return <h1>{greeting}</h1>;
}
export default App;
React functional component with props
In React, props are just like HTML attributes for the components, these are used to pass some information from one component to another.
import React from 'react';
function App() {
const greeting = 'Hello Functional Component!';
return <Headline value={greeting} />;
}
function Headline(props) {
return <h1>{props.value}</h1>;
}
export default App;
React functional component with ES6 arrow function
import React from 'react';
const App = () => {
const greeting = 'Hello Functional Component!';
return <Headline value={greeting} />;
};
const Headline = ({ value }) => {
return <h1>{value}</h1>;
};
export default App;
Class Components
A Class components are ES6 classes based Components. A component which provide more features to deal with codes. It also receives props like function components and is able to define its own states.
Each component in react has several life-cycle methods, which are being used from time to time.
Here are the list of Life-Cycle methods which are used depending on the requirements of code:
We will go in depth of react life-cycle in our next article
Let’s take a example of class component
class Greeting extends React.Component {
constructor(props) {
super(props);
}
render() {
return <h1>Hello, Class Component</h1>;
}
}
Export default Greeting
Pure Component
As per Reacts official documentation: React.PureComponent is similar to React.Component. The difference between them is that React.Component doesn’t implement shouldComponentUpdate(), but React.PureComponent implements it with a shallow prop and state comparison.
If your React component’s render() function renders the same result given the same props and state, you can use React.PureComponent for a performance boost in some cases.
Let's take an example while creating three files to understand the above official definition and how pure components works:
First file - index.js, import below created files here
import React, { Component } from 'react';
import Child from './Child';
import Pure from './pure';
class PureComp extends Component{
constructor(props){
super(props);
this.state = {
name: 'Shahab'
}
}
shouldComponentUpdate(nextProps, nextState){
if(nextState.name !== this.state.name){
return true
}
return false
}
componentDidMount(){
setInterval(() => {
this.setState({
name: 'Shahab'
})
}, 2000);
}
render(){
return(
<div>
Parent Component: {this.state.name}
<Child />
<Pure />
</div>
)
}
}
export default PureComp;
Second file - pure.js
import React, { PureComponent } from 'react'
class Pure extends PureComponent{
render(){
console.log('Pure Components')
return(
<div>Pure Components</div>
)
}
}
export default Pure
Third file - child.js
import React, {Component} from 'react'
class Child extends Component{
state ={
name: 'Ibaad'
}
shouldComponentUpdate(nextProps, nextState){
if(nextState.name !== this.state.name){
return true
}
return false
}
render(){
console.log('Child Components')
return(
<div>
Child Component: {this.state.name}
</div>
)
}
}
export default Child
Explanation of Shallow Comparison (SC) which are used in above pure components:
Primitive Types:
A (SC) b returns true if a and b have same values and are of same type.
Ex: string ‘Shahab’ (SC) string ‘Shahab’ returns true.
Complex Types
A (SC) b returns true if a and b reference the exact same object.
Ex in Array:
Var a = [1,2,3];
Var b = [1,2,3];
Var c = a;
Var ab_eq = (a === b) // false
Var ac_eq = (a === b) // true
Ex in Object:
Var a = {x = 1, x = 2};
Var b = {x = 1, x = 2};
Var c = a;
Var ab_eq = {a === c} // false
Var ac_eq = {a === b} // true
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You can find me here:
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