Exploring the contrasts and practical applications of Virtual Scroll versus Infinite Scroll within the framework of Ionic 3

After thoroughly reviewing the documentation for Ionic 3, I embarked on a quest to discern the disparity between

https://ionicframework.com/docs/api/components/virtual-scroll/VirtualScroll/

and

https://ionicframework.com/docs/api/components/infinite-scroll/InfiniteScroll/

I noticed that they utilize different components, and while there is an illustration showcasing the InfiniteScroll, there seems to be a lack of example for VirtualScroll with a seemingly more complex setup.

Could someone shed light on the variance between these two components and suggest potential scenarios in which one should be used over the other?

Answer №1

Dynamic Loading

  • To optimize performance with long lists, our approach involves dynamically loading elements in the DOM as needed. This means we only render the list data currently visible on the screen and reuse existing DOM components to display new data as old ones scroll out of view.
  • This method significantly enhances performance when handling extensive lists by reducing the amount of content rendered at once.
  • For example: You may have selected 500 records for a list, but using Dynamic Loading will introduce only a fraction of them into the DOM at any given time, resulting in smoother scrolling.

An illustration illustrating this concept can be found here: (credited to josh article below)

https://i.sstatic.net/N6oVF.png

Check out an implementation example of Dynamic Loading

Continuous Loading

  • In contrast, Continuous Loading involves fetching and displaying a predefined set of records in a list. As you reach the end of the list, it automatically loads the next batch of items and continues this process until all items are fetched.
  • Compared to Dynamic Loading, Continuous Loading offers greater flexibility and customization options through more Instance Members. This allows for enhanced control over the component's behavior.

Explore this demonstration of Continuous Loading

Additional resources: Check out Link 1 and Link 2

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