dydx/TodosController.php

## app.js
require('./bootstrap');

var sortableContainer = document.getElementById('sortable-container');
var sortableItems = sortableContainer.children;
var saveButton = document.getElementById('save');

/**
 * Set data-starting-position on sortableItems
 * @param items
 */
function setInitialIndexes (items) {
    for (var i = 0; i < items.length; i++) {
        items[i].dataset.startingPosition = i + 1;
    }
}

/**
 * Set data-new-position on sortableItems
 * @param items
 */
function setNewIndexes (items) {
    for (var i = 0; i < items.length; i++) {
        items[i].dataset.newPosition = i + 1;
    }
}

/**
 * Send list of updated indices to the server
 * @param items
 */
function sendUpdatedIndices (items) {
    $.ajax({
        url: 'sort',
        type: 'PUT',
        data: {
            _token: window.Laravel.csrfToken,
            sorted: items
        },
        dataType: 'JSON',
        success: function (data) {
            console.log(data);
        }
    });
}

// set the initial indices
(function () {
    setInitialIndexes(sortableItems);
})();

var drake = dragula({
    containers: [sortableContainer]
});

// whenever an item is dragged and dropped, set the indices
drake.on('drop', function () {
    setNewIndexes(sortableItems);
});

// send modified indices to server for updating records
saveButton.addEventListener('click', function (e) {
    var movedItems = [];

    for (var i = 0; i < sortableItems.length; i++) {
        var item = sortableItems[i];
        var itemId = item.dataset.id;
        var startingPosition = item.dataset.startingPosition;
        var newPosition = item.dataset.newPosition;

        if (startingPosition != newPosition) {
            movedItems.push([itemId, newPosition]);
        }
    }

    sendUpdatedIndices(movedItems);
});

## index.blade.php
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <meta name="csrf-token" content="{{ csrf_token() }}">
    <link href="/css/app.css" rel="stylesheet">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/dragula/3.7.2/dragula.min.css">
    <script>
        window.Laravel = <?php echo json_encode([
                'csrfToken' => csrf_token(),
        ]); ?>
    </script>

    <title>Sortable</title>
    <link rel="stylesheet" href="/css/app.css">
</head>
<body>
<div class="container">
    <div class="page-header">
        <h1>Sortable</h1>
    </div>
    <div class="panel panel-default">
        <ul class="list-group" id="sortable-container">
            @foreach ($todos as $todo)
                <li class="list-group-item"
                    data-id="{{ $todo->id }}"
                    data-starting-position="{{ $todo->position }}"
                    data-new-position="{{ $todo->position }}"
                >{{ $todo->name }}</li>
            @endforeach
        </ul>

    </div>

    <a href="#" id="save" class="btn btn-primary pull-right">Save Order</a>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/dragula/3.7.2/dragula.min.js"></script>
<script src="/js/app.js"></script>
</body>
</html>

## TodosController.php
<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Todo;

class TodosController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $todos = Todo::orderBy('position')->get();

        return view('todos.index', compact('todos'));
    }

    /**
     * Update positions for supplied items
     *
     * @param Request $request
     * @return \Illuminate\Http\Response
     */
    public function sort(Request $request)
    {
        $sorted = $request->sorted;

        foreach ($sorted as $sortedItem) {
            $item = Todo::findOrFail($sortedItem[0]);
            $item->position = $sortedItem[1];
            $item->save();
        }

        return response()->json($sorted);
    }
}

## web.php
<?php

Route::get('/', 'TodosController@index');
Route::put('/sort', 'TodosController@sort');
	require('./bootstrap');

	var sortableContainer = document.getElementById('sortable-container');
	var sortableItems = sortableContainer.children;
	var saveButton = document.getElementById('save');

	/**
	* Set data-starting-position on sortableItems
	* @param items
	*/
	function setInitialIndexes (items) {
	for (var i = 0; i < items.length; i++) {
	items[i].dataset.startingPosition = i + 1;
	}
	}

	/**
	* Set data-new-position on sortableItems
	* @param items
	*/
	function setNewIndexes (items) {
	for (var i = 0; i < items.length; i++) {
	items[i].dataset.newPosition = i + 1;
	}
	}

	/**
	* Send list of updated indices to the server
	* @param items
	*/
	function sendUpdatedIndices (items) {
	$.ajax({
	url: 'sort',
	type: 'PUT',
	data: {
	_token: window.Laravel.csrfToken,
	sorted: items
	},
	dataType: 'JSON',
	success: function (data) {
	console.log(data);
	}
	});
	}

	// set the initial indices
	(function () {
	setInitialIndexes(sortableItems);
	})();

	var drake = dragula({
	containers: [sortableContainer]
	});

	// whenever an item is dragged and dropped, set the indices
	drake.on('drop', function () {
	setNewIndexes(sortableItems);
	});

	// send modified indices to server for updating records
	saveButton.addEventListener('click', function (e) {
	var movedItems = [];

	for (var i = 0; i < sortableItems.length; i++) {
	var item = sortableItems[i];
	var itemId = item.dataset.id;
	var startingPosition = item.dataset.startingPosition;
	var newPosition = item.dataset.newPosition;

	if (startingPosition != newPosition) {
	movedItems.push([itemId, newPosition]);
	}
	}

	sendUpdatedIndices(movedItems);
	});
	<!doctype html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport"
	content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<meta name="csrf-token" content="{{ csrf_token() }}">
	<link href="/css/app.css" rel="stylesheet">
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/dragula/3.7.2/dragula.min.css">
	<script>
	window.Laravel = <?php echo json_encode([
	'csrfToken' => csrf_token(),
	]); ?>
	</script>

	<title>Sortable</title>
	<link rel="stylesheet" href="/css/app.css">
	</head>
	<body>
	<div class="container">
	<div class="page-header">
	<h1>Sortable</h1>
	</div>
	<div class="panel panel-default">
	<ul class="list-group" id="sortable-container">
	@foreach ($todos as $todo)
	<li class="list-group-item"
	data-id="{{ $todo->id }}"
	data-starting-position="{{ $todo->position }}"
	data-new-position="{{ $todo->position }}"
	>{{ $todo->name }}</li>
	@endforeach
	</ul>

	</div>

	<a href="#" id="save" class="btn btn-primary pull-right">Save Order</a>
	</div>

	<script src="https://cdnjs.cloudflare.com/ajax/libs/dragula/3.7.2/dragula.min.js"></script>
	<script src="/js/app.js"></script>
	</body>
	</html>
	<?php

	namespace App\Http\Controllers;

	use Illuminate\Http\Request;

	use App\Todo;

	class TodosController extends Controller
	{
	/**
	* Display a listing of the resource.
	*
	* @return \Illuminate\Http\Response
	*/
	public function index()
	{
	$todos = Todo::orderBy('position')->get();

	return view('todos.index', compact('todos'));
	}

	/**
	* Update positions for supplied items
	*
	* @param Request $request
	* @return \Illuminate\Http\Response
	*/
	public function sort(Request $request)
	{
	$sorted = $request->sorted;

	foreach ($sorted as $sortedItem) {
	$item = Todo::findOrFail($sortedItem[0]);
	$item->position = $sortedItem[1];
	$item->save();
	}

	return response()->json($sorted);
	}
	}
	<?php

	Route::get('/', 'TodosController@index');
	Route::put('/sort', 'TodosController@sort');