Laravel、Inertia.js v、Vue 3 を使用した無限スクロールの実装

<script setup>
import { computed } from 'vue'
import { usePage, WhenVisible } from '@inertiajs/vue3'
import LoadingSpinner from '@/components/LoadingSpinner.vue'
import BlogPostCard from '@/components/BlogPostCard.vue'

const page = usePage()

const hasFeaturePost = computed(() => !!page.props.featuredPost)
const categoryName = computed(() => page.props.category?.name)
</script>

<template>
    <div>



<h3>
  
  
  Key Frontend Features
</h3>

<ol>
<li><p><strong>WhenVisible Component</strong>: This component from Inertia.js v2.0 automatically triggers a request when the element becomes visible in the viewport.</p></li>
<li><p><strong>Pagination Parameters</strong>:<br>
</p></li>
</ol>

<pre class="brush:php;toolbar:false">:params="{
    data: {
        page: page.props.postsPagination.current_page + 1,
    },
    only: ['posts', 'postsPagination'],
}"

<?php

namespace App\Http\Controllers;

use App\Models\Post;
use App\Models\Category;
use Illuminate\Pagination\LengthAwarePaginator;
use Inertia\Inertia;

class BlogController extends Controller
{
    public function index(?Category $category = null)
    {
        return Inertia::render('Blog/Index', [
            'category' => $category,
            'featuredPost' => $this->getFeaturedPost(),
            'posts' => $this->getPaginatedPosts($category),
            'postsPagination' => $this->getPaginatedPosts($category)?->toArray(),
        ]);
    }

    protected function getPaginatedPosts(?Category $category): ?LengthAwarePaginator
    {
        $currentPage = request()->input('page', 1);
        $perPage = request()->input('per_page', 12);

        $query = Post::query()
            ->with(['author', 'category'])
            ->published();

        if ($category) {
            $query->where('category_id', $category->id);
        }

        // Apply any additional filters
        if (request()->has('sort')) {
            $query->orderBy(request()->input('sort'), request()->input('direction', 'desc'));
        } else {
            $query->latest();
        }

        // Handle full page load vs. infinite scroll request
        if (!request()->header('X-Inertia')) {
            // Full page load - fetch all pages up to current
            $allResults = collect();

            for ($page = 1; $page <= $currentPage; $page++) {
                $pageResults = $query->paginate($perPage, ['*'], 'page', $page);
                $allResults = $allResults->concat($pageResults->items());
            }

            return new LengthAwarePaginator(
                $allResults,
                Post::query()
                    ->published()
                    ->when($category, fn($q) => $q->where('category_id', $category->id))
                    ->count(),
                $perPage,
                $currentPage
            );
        }

        return $query->paginate($perPage);
    }

    protected function getFeaturedPost()
    {
        return Post::query()
            ->with(['author', 'category'])
            ->published()
            ->featured()
            ->latest()
            ->first();
    }
}

if (!request()->header('X-Inertia')) {
    // Full page load logic
} else {
    // Regular pagination for infinite scroll
}

for ($page = 1; $page <= $currentPage; $page++) {
    $pageResults = $query->paginate($perPage, ['*'], 'page', $page);
    $allResults = $allResults->concat($pageResults->items());
}

$query = Post::query()
    ->with(['author', 'category'])
    ->published();