VueUse useIntersectionObserver и rootMargin, срабатывающий задолго до того, как элемент окажется в пределах диапазона

Это не полный ответ, но вместо этого я использовал новый scrollMarginrootMargin, который сработал.

Однако у меня были и другие проблемы, поскольку я пытался создать бесконечную прокрутку, которая допускала бы прокрутку как вверх, так и вниз. например чат личных сообщений, в котором мы обычно хотим прокрутить вверх и добавить новые элементы вверху ленты, а не внизу.

Для тех, кто застрял в этом, это модифицированная версия, которая теперь работает у меня:

использование: let { items, canLoadMoreItems, loading } = useInfiniteScroll('posts', infiniteScrollElement,'down', 500)

/**
 * Custom composable function for implementing infinite scroll functionality.
 *
 * @param {string} propName - The name of the prop that contains the data to be paginated.
 * @param {HTMLElement|null} landmark - The element to observe for intersection. If null, infinite scroll will not be triggered by intersection. *** N.B. Must be a scrollable element with a fixed height
 * @param {string|down} scrollDirection - Which direction is user scrolling up/down
 * @param {number|200} triggerDistance - how many pixels from the edge should it trigger.
 * @returns {object} - An object containing the paginated items, methods to load more items and reset items, and a computed property indicating if more items can be loaded.
 */

import { computed, nextTick, ref, watch, watchEffect } from 'vue'
import { router, usePage } from '@inertiajs/vue3'


export function useInfiniteScroll(propName, landmark = null, scrollDirection = 'down', triggerDistance = 200) {

    // Store loading state to stop multiple triggers
    const loading = ref(false);

    // Get the value of the prop that contains the data to be paginated.
    const value = () => usePage().props[propName]

    // Create a ref to store all the  paginated items.
    const items = ref(value().data)

    // Watch for changes to prop and update items accordingly.
    // Allows itemsto be added from an external source
    watch(() => value().data, (newValue) => {
        if (!loading.value) {
            items.value = newValue;
        }
    }, { deep: true });

    // Get the initial URL of the page so we can replace the URL after loading more items.
    const initialUrl = usePage().url

    // Computed property to check if more items can be loaded.
    const canLoadMoreItems = computed(() => value().next_page_url !== null)

    // Create the listeners for scoll on the landmark element
    if (landmark != null) {
        nextTick(() => {
            landmark.value.addEventListener('scroll', () => {
                    checkPosition();
            });
            landmark.value.addEventListener('touchmove', () => {
                    checkPosition();
            });
        });
    }


    // Method to check if the landmark element is in range
    const checkPosition = () => {

        if (loading.value || !canLoadMoreItems.value) {
            return;
        }

        //downward scroll
        if (scrollDirection.toLowerCase() === 'down') {

            const elementScrollBottom = landmark.value.scrollHeight - landmark.value.scrollTop;

            if (elementScrollBottom - window.innerHeight <= triggerDistance) {
                loadMoreItems();
            }
        }

        //upward scroll
        else if (landmark.value.scrollTop <= triggerDistance) {
            loadMoreItems();
        }


    };

    // Method to load more items.
    const loadMoreItems = () => {

        // Set the loading state to true.
        loading.value = true;

        // Load more items using Inertia's get method and append the new items to the existing items.
        router.get(
            value().next_page_url,
            {},
            {
                preserveState: true,
                preserveScroll: true, //only works for downward scroll
                onSuccess: () => {

                    //reset url to initial url
                    window.history.replaceState({}, '', initialUrl)

                    // Capture scroll position
                    const originalScrollPosition = landmark.value.scrollHeight - landmark.value.scrollTop;

                    //add new items to the page
                    items.value = [...items.value, ...value().data]

                    nextTick(() => {

                        // only if its upward scroll reset the scroll position
                        if (scrollDirection.toLowerCase() === 'up') {
                            landmark.value.scrollTop = landmark.value.scrollHeight - originalScrollPosition;
                        }

                    });

                    loading.value = false;
                },
                onError: (error) => {
                    console.error(error);
                    loading.value = false;
                }
            }
        )
    }


  // Return the items, loadMoreItems method, resetItems method, and canLoadMoreItems computed property.
  return {
    items,
    loadMoreItems,
    resetItems: () => (items.value = value().data),
    canLoadMoreItems,
    loading
  }
}