Laravel - Validation

Validation is the most important aspect while designing an application. It validates the incoming data. As a matter of course, the base controller class utilizes a ValidatesRequests characteristic which gives an advantageous strategy to approve approaching HTTP demands with an assortment of ground-breaking validation rules.

Available Validation Rules in Laravel

Laravel will dependably check for errors in the session information, and naturally tie them to the view on the off chance that they are accessible. In this way, note a $errors variable will dependably be accessible in the majority of your perspectives on each solicitation, enabling you to helpfully accept the $errors variable is constantly characterized and can be securely utilized. The following table demonstrates all accessible validation runs in Laravel.

The $errors variable will be an instance of Illuminate\Support\MessageBag. The error message can be displayed in the view file by adding the code as shown below.

@if (count($errors) > 0)
   <div class = "alert alert-danger">
      

         @foreach ($errors->all() as $error)
            
{{ $error }}li>
         @endforeach
      ul>
   div>
@endif

Example

Step 1 − Create a controller called ValidationController by executing the following command.

php artisan make:controller ValidationController --plain

Step 2 − After successful execution, you will receive the following output −

Step 3 − Copy the following code in

app/Http/Controllers/ValidationController.php file.

app/Http/Controllers/ValidationController.php

php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;

class ValidationController extends Controller {
   public function showform() {
      return view('login');
   }
   public function validateform(Request $request) {
      print_r($request->all());
      $this->validate($request,[
         'username'=>'required|max:8',
         'password'=>'required'
      ]);
   }
}

Step 4 − Create a view file called resources/views/login.blade.php and copy the following code in that file.

resources/views/login.blade.php

   
   
      
   

   
      
      @if (count($errors) > 0)
         
 class = "alert alert-danger">
            

               @foreach ($errors->all() as $error)
                  
{{ $error }}
               @endforeach
            
         
      @endif
      
      php
         echo Form::open(array('url'=>'/validation'));
      ?>
      
       border = '1'>
         
            
 align = 'center' colspan = '2'>Login
         
         
            Username
            php echo Form::text('username'); ?>
         
         
            Password
            php echo Form::password('password'); ?>
         
         
            
 align = 'center' colspan = '2'
               >php echo Form::submit('Login'); ?  >td>
         tr>
      table>
      
      php
         echo Form::close();
      ?>
   
   

Step 5 − Add the following lines in app/Http/routes.php.

app/Http/routes.php

Route::get('/validation','ValidationController@showform');
Route::post('/validation','ValidationController@validateform');

Step 6 − Visit the following URL to test the validation.

http://localhost:8000/validation

Step 7 − Click the “Login” button without entering anything in the text field. The output will be as shown in the following image.