Components

Animated Number

GitHub

A Stimulus controller that animates a numerical value by counting to it.

Installation

  1. Install the package

    Terminal
    $ yarn add @stimulus-components/animated-number

  2. Register the controller in your application

    app/javascript/controllers/index.js
    import { Application } from '@hotwired/stimulus'
import AnimatedNumber from '@stimulus-components/animated-number'

const application = Application.start()
application.register('animated-number', AnimatedNumber)

Example

Animated Number

Counting from 0 to 100 in 3 seconds:

Usage

app/views/index.html
<div
  data-controller="animated-number"
  data-animated-number-start-value="0"
  data-animated-number-end-value="200"
  data-animated-number-duration-value="3000"
>
  0
</div>
app/views/index.html
<div
  data-controller="animated-number"
  data-animated-number-lazy-value=""
  data-animated-number-start-value="0"
  data-animated-number-end-value="200"
  data-animated-number-duration-value="3000"
>
  This animation will start only when the element become visible thanks to Intersection Observers.
</div>
app/views/index.html
<div
  data-controller="animated-number"
  data-animated-number-lazy-value=""
  data-animated-number-lazy-root-margin-value="30px"
  data-animated-number-lazy-threshold-value="0.4"
  data-animated-number-start-value="0"
  data-animated-number-end-value="200"
  data-animated-number-duration-value="3000"
>
  You can customize the Intersection Observer options.
</div>

Configuration

AttributeDefaultDescriptionOptional
data-animated-number-start-valueundefinedNumber, at which animation starts.❌
data-animated-number-end-valueundefinedNumber, at which animation ends.❌
data-animated-number-duration-valueundefinedTotal animation duration in milliseconds.❌
data-animated-number-lazy-valueundefinedFetch content when element is visible.✅
data-animated-number-lazy-root-margin-value0pxrootMargin option for Intersection Observer.✅
data-animated-number-lazy-threshold-value0threshold option for Intersection Observer.✅

Extending Controller

You can use inheritance to extend the functionality of any Stimulus component:

app/javascript/controllers/animated_number_controller.js
import AnimatedNumber from "@stimulus-components/animated-number"

export default class extends AnimatedNumber {
  connect() {
    super.connect()
    console.log("Do what you want here.")
  }
}

This controller will automatically have access to targets defined in the parent class.

If you override the connect, disconnect or any other methods from the parent, you'll want to call super.method() to make sure the parent functionality is executed.