Answer
Detect scroll position and load content via AJAX near bottom.
Throttle scroll events.
Append results using document fragments.
Throttle scroll events.
Append results using document fragments.
Quick Answer
Efficient infinite scroll: use IntersectionObserver on a sentinel element at the bottom (cleaner than scroll position math), load more items on trigger, append to existing list with event delegation maintained, track a "loading" flag to prevent duplicate requests, handle end-of-data state (remove sentinel or hide trigger), and use a virtualized list (virtual-scroller) if the list becomes huge.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ