Intersection Observer & Efficient Scroll Handling

How should you handle scroll-based infinite loading to prevent performance issues?

const loadMoreCallback = (entries) => {
  const trigger = entries[0];
  if (trigger.isIntersecting && !isLoading) {
    isLoading = true;
    loadNextPage()
      .then(() => {
        isLoading = false;
      })
      .catch(error => {
        console.error('Loading failed:', error);
        isLoading = false;
      });
  }
};

const observer = new IntersectionObserver(loadMoreCallback, {
  root: null,
  rootMargin: '200px'
});

Use multiple scroll event listeners
Load all content at once
Implement debouncing with setTimeout
Use a loading flag and rootMargin
Efficient infinite loading implementation requires several optimizations: 1) Using a loading flag to prevent multiple simultaneous requests, 2) Setting an appropriate rootMargin to preload content before it's needed, 3) Properly handling loading states and errors, 4) Using Intersection Observer instead of scroll events. The code demonstrates these best practices by maintaining an isLoading flag, using rootMargin for preloading, and ensuring proper error handling. This approach provides a smooth user experience while preventing performance issues like request flooding or unnecessary API calls.

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