How to Detect if the User Has Scrolled to the Bottom of a Page with Dynamic Content?

Detecting Scroll Position at Page Bottom for Dynamic Content Loading

When managing dynamic content on a webpage, it's crucial to determine whether the user has scrolled to the bottom. This knowledge allows developers to automatically scroll the page to newly added content or avoid interrupting the user's current browsing experience.

To detect the user's scroll position, JavaScript provides a robust solution:

window.onscroll = function(ev) {
    if ((window.innerHeight + Math.round(window.scrollY)) >= document.body.offsetHeight) {
        // you're at the bottom of the page
    }
};

This code attaches an event listener to the window.onscroll event. Whenever the user scrolls, the listener calculates the current scroll position and compares it to the total page height. If the sum of the viewport height and scroll offset is equal to or greater than the page height, it indicates that the user has reached the bottom of the page.

By implementing this solution, you can ensure that new content is added to the page without interrupting the user's ongoing reading experience, while simultaneously allowing for effortless scrolling to newly loaded content when the user reaches the bottom.

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