@corentints/before-after NPM

BeforeAfter

Before After library demo

Customizable image comparison library

BeforeAfter

Installation

Package manager

// using npm
npm install @corentints/before-after

// using yarn
yarn add @corentints/before-after

// using pnpm
pnpm install @corentints/before-after

CDN

<script src="https://cdn.jsdelivr.net/npm/@corentints/before-after@latest/dist/before-after.umd.min.js"></script>

Basic usage

Set up the HTML:

Just put two images in a div. The first image will automatically be on the left and the second on the right.

<div id="before-after">
  <img src="./assets/before.png" alt="Squirtle" />
  <img src="./assets/after.png" alt="Squirtle with sunglasses" />
</div>

// not necessary if you are not using package manager
import BeforeAfter from '@corentints/before-after'

const beforeAfterElement = new BeforeAfter({
  rootElement: document.querySelector("#before-after")
});

Parameters

Parameter	Description	Type	Default value	Required
rootElement	The root element	HTMLDivElement	/	yes
allowSlide	Allow user to drag and slide the slider	boolean	true	no
allowClick	Allow user to click in the image to move the slider	boolean	true	no
clickTransition	Enable transition animation on click	boolean	true	no
clickTransitionDuration	Set the click transition duration in ms	number	500	no
defaultSliderPosition	The slider position in percent	number	50	no
topRightText	Top right text	string	/	no
bottomRightText	Bottom right text	string	/	no
topLeftText	Top left text	string	/	no
bottomLeftText	Bottom left text	string	/	no
textClassName	Custom CSS classname for text	string	'before-after__text'	no

Here is an example with all parameters:

const beforeAfterElement = new BeforeAfter({
  rootElement: document.querySelector("#before-after"),
  allowSlide: false,
  allowClick: true,
  clickTransitionDuration: 1000,
  defaultSliderPosition: 45,
  topLeftText: "Top left text",
  topRightText: "Top right text",
  bottomLeftText: "Bottom left text",
  bottomRightText: "Bottom right text",
  textClassName: "my-custom-class"
});

Customize

Style

You can customize the slider by overriding the existing CSS.

You can find the CSS file here.

Custom Slider element

You can insert your own HTML element to create a custom slider. Add the attribute data-ba-element="slider" to it and the library will use it automatically.

You don't need to manage the height nor the position of it: the library will apply a style automatically to do so.

Example:

<div id="before-after">
  <div data-ba-element="slider" class="my-custom-slider">
    <p>My customer slider text</p>
  </div>
  <img src="./assets/before.png" alt="Squirtle" />
  <img src="./assets/after.png" alt="Squirtle with sunglasses" />
</div>