In this tutorial, we will learn Laravel - Category Treeview Hierarchical Structure Example with Demo


Step 1: 

Install Laravel 5.3 Application 

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

Step 2: 

Create Category Table and Model 

php artisan make:migration create_category_table
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;


class CreateCategoryTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('categories', function (Blueprint $table) {
           $table->increments('id');
           $table->string('title');
           $table->integer('parent_id');
           $table->timestamps();
       });
    }


    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop("categories");
    }
}


app/Category.php

<?php


namespace App;


use Illuminate\Database\Eloquent\Model;


class Category extends Model
{


    public $fillable = ['title','parent_id'];


    /**
     * Get the index name for the model.
     *
     * @return string
    */
    public function childs() {
        return $this->hasMany('App\Category','parent_id','id') ;
    }
}

Step 3: 

Create Route routes/web.php

Route::get('category-tree-view',['uses'=>'CategoryController@manageCategory']);
Route::post('add-category',['as'=>'add.category','uses'=>'CategoryController@addCategory']);


Step 4: 

Create Controller 

  1. manageCategory()
  2. addCategory()

app/Http/Controllers/CategoryController.php

<?php


namespace App\Http\Controllers;


use Illuminate\Http\Request;
use App\Http\Requests;
use App\Category;


class CategoryController extends Controller
{
    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function manageCategory()
    {
        $categories = Category::where('parent_id', '=', 0)->get();
        $allCategories = Category::pluck('title','id')->all();
        return view('categoryTreeview',compact('categories','allCategories'));
    }


    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function addCategory(Request $request)
    {
        $this->validate($request, [
        		'title' => 'required',
        	]);
        $input = $request->all();
        $input['parent_id'] = empty($input['parent_id']) ? 0 : $input['parent_id'];
        
        Category::create($input);
        return back()->with('success', 'New Category added successfully.');
    }


}


Step 5: 

Create View 

  1. categoryTreeview.blade.php

     2. manageChild.blade.php


resources/views/categoryTreeview.blade.php

<!DOCTYPE html>
<html>
<head>
	<title>Laravel Category Treeview Example</title>
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" />
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <link href="/css/treeview.css" rel="stylesheet">
</head>
<body>
	<div class="container">     
		<div class="panel panel-primary">
			<div class="panel-heading">Manage Category TreeView</div>
	  		<div class="panel-body">
	  			<div class="row">
	  				<div class="col-md-6">
	  					<h3>Category List</h3>
				        <ul id="tree1">
				            @foreach($categories as $category)
				                <li>
				                    {{ $category->title }}
				                    @if(count($category->childs))
				                        @include('manageChild',['childs' => $category->childs])
				                    @endif
				                </li>
				            @endforeach
				        </ul>
	  				</div>
	  				<div class="col-md-6">
	  					<h3>Add New Category</h3>


				  			{!! Form::open(['route'=>'add.category']) !!}


				  				@if ($message = Session::get('success'))
									<div class="alert alert-success alert-block">
										<button type="button" class="close" data-dismiss="alert">×</button>	
									        <strong>{{ $message }}</strong>
									</div>
								@endif


				  				<div class="form-group {{ $errors->has('title') ? 'has-error' : '' }}">
									{!! Form::label('Title:') !!}
									{!! Form::text('title', old('title'), ['class'=>'form-control', 'placeholder'=>'Enter Title']) !!}
									<span class="text-danger">{{ $errors->first('title') }}</span>
								</div>


								<div class="form-group {{ $errors->has('parent_id') ? 'has-error' : '' }}">
									{!! Form::label('Category:') !!}
									{!! Form::select('parent_id',$allCategories, old('parent_id'), ['class'=>'form-control', 'placeholder'=>'Select Category']) !!}
									<span class="text-danger">{{ $errors->first('parent_id') }}</span>
								</div>


								<div class="form-group">
									<button class="btn btn-success">Add New</button>
								</div>


				  			{!! Form::close() !!}


	  				</div>
	  			</div>

	  			
	  		</div>
        </div>
    </div>
    <script src="/js/treeview.js"></script>
</body>
</html>

resources/views/manageChild.blade.php

<ul>
@foreach($childs as $child)
	<li>
	    {{ $child->title }}
	@if(count($child->childs))
            @include('manageChild',['childs' => $child->childs])
        @endif
	</li>
@endforeach
</ul>


Step 6: 

Add CSS and JS File public/css/treeview.css

.tree, .tree ul {
    margin:0;
    padding:0;
    list-style:none
}
.tree ul {
    margin-left:1em;
    position:relative
}
.tree ul ul {
    margin-left:.5em
}
.tree ul:before {
    content:"";
    display:block;
    width:0;
    position:absolute;
    top:0;
    bottom:0;
    left:0;
    border-left:1px solid
}
.tree li {
    margin:0;
    padding:0 1em;
    line-height:2em;
    color:#369;
    font-weight:700;
    position:relative
}
.tree ul li:before {
    content:"";
    display:block;
    width:10px;
    height:0;
    border-top:1px solid;
    margin-top:-1px;
    position:absolute;
    top:1em;
    left:0
}
.tree ul li:last-child:before {
    background:#fff;
    height:auto;
    top:1em;
    bottom:0
}
.indicator {
    margin-right:5px;
}
.tree li a {
    text-decoration: none;
    color:#369;
}
.tree li button, .tree li button:active, .tree li button:focus {
    text-decoration: none;
    color:#369;
    border:none;
    background:transparent;
    margin:0px 0px 0px 0px;
    padding:0px 0px 0px 0px;
    outline: 0;
}

public/js/treeview.js

$.fn.extend({
    treed: function (o) {
      
      var openedClass = 'glyphicon-minus-sign';
      var closedClass = 'glyphicon-plus-sign';
      
      if (typeof o != 'undefined'){
        if (typeof o.openedClass != 'undefined'){
        openedClass = o.openedClass;
        }
        if (typeof o.closedClass != 'undefined'){
        closedClass = o.closedClass;
        }
      };
      
        /* initialize each of the top levels */
        var tree = $(this);
        tree.addClass("tree");
        tree.find('li').has("ul").each(function () {
            var branch = $(this);
            branch.prepend("");
            branch.addClass('branch');
            branch.on('click', function (e) {
                if (this == e.target) {
                    var icon = $(this).children('i:first');
                    icon.toggleClass(openedClass + " " + closedClass);
                    $(this).children().children().toggle();
                }
            })
            branch.children().children().toggle();
        });
        /* fire event from the dynamically added icon */
        tree.find('.branch .indicator').each(function(){
            $(this).on('click', function () {
                $(this).closest('li').click();
            });
        });
        /* fire event to open branch if the li contains an anchor instead of text */
        tree.find('.branch>a').each(function () {
            $(this).on('click', function (e) {
                $(this).closest('li').click();
                e.preventDefault();
            });
        });
        /* fire event to open branch if the li contains a button instead of text */
        tree.find('.branch>button').each(function () {
            $(this).on('click', function (e) {
                $(this).closest('li').click();
                e.preventDefault();
            });
        });
    }
});
/* Initialization of treeviews */
$('#tree1').treed();


May this example help you