Laravel 8 Custom Validation Rules Tutorial

Hi Dev,

Today,I will learn you how to use custom validation rules in laravel 8. We will show laravel 8 custom validation rules example you can easliy create custom validation rules in laravel 8.Validation is a primary requirement of every project, without validation we can not release successful application or website. Because if you haven't implemented validation then you get wrong information from use input. Laravel provide there are several default validation rules like required, max, min, array, unique, digits, in, boolean, before, after etc. We can simple use those validation rules in laravel 8 application. But if you require to create your own custom validation like given value should be in uppercase or lowercase etc as we require.

Now, we will simple represent how to make custom validator rules in laravel 8 application and it is very simple, so you have to just follow bellow step, make sure you can create only for laravel 8

we make example from scratch. In this example i take number text field and you can just enter even number, If you enter odd number then you got validation error.

Step 1: Create Custom Validation Rule

In first step, we will create custom validation rules by run following command. Bellow command through you can create Validation rules file and we can write a logic on that file. So let's run bellow command.

php artisan make:rule CheckPriceRule

Now, after successfully run above command, you will found new "rules" folder in app directory. In rules folder you will also found CheckPriceRule.php file. We have to simple write logic there, if you enter even number then return true otherwise don't do anything.

So, you should have file like as bellow:

app/Rules/CheckPriceRule.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class CheckPriceRule implements Rule
{
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        if ($value < 300) {
            return true;
        }
    }

    /**
     * Get the validation error messPrice.
     *
     * @return string
     */
    public function messPrice()
    {
        return 'The :attribute must be less than 300.';
    }
}

Step 2: Add Routes

Here, we need to add two routes for create form get method and another for post method. so open your routes/web.php file and add following route.

routes/web.php

<?php
  
use Illuminate\Support\Facades\Route;
  
use App\Http\Controllers\ImageResizeController;
  
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
use App\Http\Controllers\CustomValidationController;

//Custom Validation
Route::get('/custom-validation', [CustomValidationController::class, 'index'])->name('custom.validation.index');
Route::post('/custom-validation/store', [CustomValidationController::class, 'store'])->name('custom.validation.store');

Step 3: Create CustomValidationController

Here, now we should create new controller as CustomValidationController. So run bellow command and create new controller. bellow controller for create controller.

php artisan make:controller CustomValidationController

Next bellow command you will find new file in this path app/Http/Controllers/CustomValidationController.php.

In this controller will create seven methods by default as bellow methods:

• 1)index()
• 2)store()

So, let's copy bellow code and put on CustomValidationController.php file.

app/Http/Controllers/CustomValidationController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Rules\CheckPriceRule;

class CustomValidationController extends Controller
{
    public function index()
    {
    	return view('customValidation');
    }

    public function store(Request $request)
    {
    	$request->validate([
            'name' => 'required',
            'price' => [
                'required', 
                new CheckPriceRule()
            ]
        ]);

    	dd("continue...");
    }
}

Step 4: Create View File

In this last step, we have to create customValidation.blade.php file, in this file we will create form and display validation error so let's create customValidation.blade.php file and put bellow code:

resources/views/customValidation.blade.php

<!DOCTYPE html>
<html>
<head>
    <title>Laravel 8 Custom Validation</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" integrity="sha256-NuCn4IvuZXdBaFKJOAcsU2Q3ZpwbdFisd5dux4jkQ5w=" crossorigin="anonymous" />
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-md-6 offset-3 mt-5">
            <div class="card mt-5">
                <div class="card-header text-center bg-info">
                    <h2 class="text-white"> <strong>Custom Validation</strong></h2>
                </div>
                <div class="card-body">
                    @if (count($errors) > 0)
                        <ul class="alert alert-danger pl-5">
	                        @foreach($errors->all() as $error)
	                           <li>{{ $error }}</li> 
	                        @endforeach
                        </ul>
                    @endif
                    <form action="{{ route('custom.validation.store') }}" method="post">
                        @csrf
                        <div class="form-group">
                            <label>Name</label>
                            <input type="text" name="name" class="form-control">
                        </div>
                        <div class="form-group">
                            <label>Price</label>
                            <input type="text" name="price" class="form-control">
                        </div>
                        <div class="text-center">
                            <button class="btn btn-success"><i class="fa fa-floppy-o" aria-hidden="true"></i> Save </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
</body>
</html>

Now we are ready to run our custom validation rules example so run bellow command for quick run:

php artisan serve

Now you can open bellow URL on your browser:

http://localhost:8000/custom-validation

It will help you...