Hierarchical Tree view Category Example in Laravel

For most of the projects you work on in PHP or in any language, there you have to encounter categories and subcategories. When comes to categories, the tree view is the best listing method that we can use in our web apps.

In this article, we are showing you how to create a Laravel tree view for multi-level data. In this Laravel tree example tutorial we won’t use any third-party packages, but just Eloquent ORM and blade views.

Let’s dive deeper into Laravel tree view model. Here we have used Laravel 7, as it is the latest version when writing this article.

Step 1: Install Laravel 7 Application

Run the below command in the shell script. This will install the latest version of Laravel in your development environment.

composer create-project --prefer-dist laravel/laravel categoryApp

Step 2: Create Category Model with the migration file

The -m is helping us to create a migration along with the Model file.

php artisan make:model Category -m

Step 3: Add the necessary fields to the migration file

<?php use Illuminate\Support\Facades\Schema; use Illuminate\Database\Schema\Blueprint; use Illuminate\Database\Migrations\Migration; class CreateTaxonomyTable extends Migration { /** * Run the migrations. * * @return void */ public function up() { Schema::create('category', function (Blueprint $table) { $table->bigIncrements('id'); $table->unsignedInteger('parent_id')->nullable(); $table->string('title'); $table->timestamps(); }); } /** * Reverse the migrations. * * @return void */ public function down() { Schema::dropIfExists('category'); } } 

Step 4: Modify the Category model to add the relationship

app/Category.php

<?php namespace App; use Illuminate\Database\Eloquent\Model; class Category extends Model { public function subcategory(){ return $this->hasMany('App\Category', 'parent_id'); } }

This says a parent_id will have many child categories. This relationship is pointing to the same table. In some cases, you will have to point this to a different table and Models.

Step 5: Create the route to view the page

Route::get('/category','CategoryController@index');

Step 6: Create the controller

app/Http/Controllers/CategoryController.php

namespace App\Http\Controllers; use Illuminate\Http\Request; class CategoryController extends Controller { public function index() { $parentCategories = \App\Category::where('parent_id',0)->get(); return view('category.index', compact('parentCategories')); } }

Step 7: Create views

Create a folder resources/views/category and below listed files.

1. index.blade.php
2. sub_category_list.blade.php

The above files will help us to render the categories in the desired tree view.

resources/views/category/index.blade.php

 @foreach($parentCategories as $taxonomy) <ul> <li><a href="{{ action('Admin\CategoryController@edit',$taxonomy->id) }}">{{$taxonomy->title}}</a></li> @if(count($taxonomy->subcategory)) @include('admin.category.sub_category_list',['subcategories' => $taxonomy->subcategory]) @endif </ul> @endforeach

resources/views/category/sub_category_list.blade.php

@foreach($subcategories as $subcategory) <ul> <li>{{$subcategory->title}}</li> @if(count($subcategory->subcategory)) @include('admin.category.sub_category_list',['subcategories' => $subcategory->subcategory]) @endif </ul> @endforeach 

The above views are recursive views, so one will load inside the other. If we have all the setup in place, you will see the desired result from the below table