fix: apps loading issue (#994)

web/app/(commonLayout)/apps/Apps.tsx

 'use client'
 
-import { useEffect, useRef, useState } from 'react'
+import { useCallback, useEffect, useRef, useState } from 'react'
 import { useRouter, useSearchParams } from 'next/navigation'
 import useSWRInfinite from 'swr/infinite'
-import { debounce } from 'lodash-es'
 import { useTranslation } from 'react-i18next'
 import AppCard from './AppCard'
 import NewAppCard from './NewAppCard'
 import type { AppListResponse } from '@/models/app'
 import { fetchAppList } from '@/service/apps'
-import { useAppContext, useSelector } from '@/context/app-context'
+import { useAppContext } from '@/context/app-context'
 import { NEED_REFRESH_APP_LIST_KEY } from '@/config'
 import { ProviderEnum } from '@/app/components/header/account-setting/model-page/declarations'
 import Confirm from '@/app/components/base/confirm/common'
@@ -24,15 +23,18 @@ const Apps = () => {
   const { t } = useTranslation()
   const { isCurrentWorkspaceManager } = useAppContext()
   const { data, isLoading, setSize, mutate } = useSWRInfinite(getKey, fetchAppList, { revalidateFirstPage: false })
-  const loadingStateRef = useRef(false)
-  const pageContainerRef = useSelector(state => state.pageContainerRef)
-  const anchorRef = useRef<HTMLAnchorElement>(null)
+  const anchorRef = useRef<HTMLDivElement>(null)
   const searchParams = useSearchParams()
   const router = useRouter()
   const payProviderName = searchParams.get('provider_name')
   const payStatus = searchParams.get('payment_result')
   const [showPayStatusModal, setShowPayStatusModal] = useState(false)
 
+  const handleCancelShowPayStatusModal = useCallback(() => {
+    setShowPayStatusModal(false)
+    router.replace('/', { forceOptimisticNavigation: false })
+  }, [router])
+
   useEffect(() => {
     document.title = `${t('app.title')} -  Dify`
     if (localStorage.getItem(NEED_REFRESH_APP_LIST_KEY) === '1') {
@@ -41,35 +43,24 @@ const Apps = () => {
     }
     if (payProviderName === ProviderEnum.anthropic && (payStatus === 'succeeded' || payStatus === 'cancelled'))
       setShowPayStatusModal(true)
-  }, [])
+  }, [mutate, payProviderName, payStatus, t])
 
   useEffect(() => {
-    loadingStateRef.current = isLoading
-  }, [isLoading])
-
-  useEffect(() => {
-    const onScroll = debounce(() => {
-      if (!loadingStateRef.current) {
-        const { scrollTop, clientHeight } = pageContainerRef.current!
-        const anchorOffset = anchorRef.current!.offsetTop
-        if (anchorOffset - scrollTop - clientHeight < 100)
+    let observer: IntersectionObserver | undefined
+    if (anchorRef.current) {
+      observer = new IntersectionObserver((entries) => {
+        if (entries[0].isIntersecting)
           setSize(size => size + 1)
-      }
-    }, 50)
-
-    pageContainerRef.current?.addEventListener('scroll', onScroll)
-    return () => pageContainerRef.current?.removeEventListener('scroll', onScroll)
-  }, [])
-
-  const handleCancelShowPayStatusModal = () => {
-    setShowPayStatusModal(false)
-    router.replace('/', { forceOptimisticNavigation: false })
-  }
+      }, { rootMargin: '100px' })
+      observer.observe(anchorRef.current)
+    }
+    return () => observer?.disconnect()
+  }, [isLoading, setSize, anchorRef, mutate])
 
   return (
-    <nav className='grid content-start grid-cols-1 gap-4 px-12 pt-8 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 grow shrink-0'>
+    <><nav className='grid content-start grid-cols-1 gap-4 px-12 pt-8 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4 grow shrink-0'>
       { isCurrentWorkspaceManager
-      && <NewAppCard ref={anchorRef} onSuccess={mutate} />}
+      && <NewAppCard onSuccess={mutate} />}
       {data?.map(({ data: apps }) => apps.map(app => (
         <AppCard key={app.id} app={app} onRefresh={mutate} />
       )))}
@@ -95,6 +86,8 @@ const Apps = () => {
         )
       }
     </nav>
+    <div ref={anchorRef} className='h-0'> </div>
+    </>
   )
 }