Scroll Size Tracking With ScrollSizeObserver Library

Category: Javascript | March 5, 2024
Author:avisek
Views Total:8 views
Official Page:Go to website
Last Update:March 5, 2024
License:MIT

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Scroll Size Tracking With ScrollSizeObserver Library

Description:

The ScrollSizeObserver library is designed to simplify the process of tracking changes in an element’s scroll size.

It allows developers to easily observe the scrollWidth and scrollHeight properties of specific elements and react to these changes.

Useful for detecting when the content size exceeds the container’s dimensions, or for building responsive layouts where developers can adjust the layout or apply specific styles based on the content size.

How to use it:

1. Install & download the ScrollSizeObserver with NPM.

# NPM
$ npm install scroll-size-observer

2. Import the ScrollSizeObserver component into your project.

import { ScrollSizeObserver } from 'scroll-size-observer'
// OR from a CDN
<script type="module">
  import { ScrollSizeObserver as l } from "https://cdn.jsdelivr.net/npm/[email protected]/+esm";
</script>

3. Creata a new instance of the ScrollSizeObserver and observe the current/prev scrollWidth and scrollHeight properties of an element.

const observer = new ScrollSizeObserver((entries, observer) => {
  entries.forEach((entry) => {
    console.log('Target element:', entry.target)
    console.log('New scrollWidth:', entry.scrollWidth)
    console.log('New scrollHeight:', entry.scrollHeight)
    console.log('Previous scrollWidth:', entry.previousScrollWidth)
    console.log('Previous scrollHeight:', entry.previousScrollHeight)
  })
})

4. More API methods.

// Observe an element
observer.observe(elementToObserve)
// Observe only changes to the scrollHeight property
observer.observe(elementToObserve, { 
  scrollWidth: false 
})
// Unobserve an element
observer.unobserve(elementToUnobserve)
// Unobserve all
observer.disconnect()

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