Laravel – Validation

Validation is the most important aspect while designing an application. It validates the incoming data. By default, base controller class uses a ValidatesRequests trait which provides a convenient method to validate incoming HTTP requests with a variety of powerful validation rules.

Available Validation Rules in Laravel

Laravel will always check for errors in the session data, and automatically bind them to the view if they are available. So, it is important to note that a $errors variable will always be available in all of your views on every request, allowing you to conveniently assume the $errors variable is always defined and can be safely used. The following table shows all available validation rules in Laravel.

Available Validation Rules in Laravel
Accepted	Active URL	After (Date)
Alpha	Alpha Dash	Alpha Numeric
Array	Before (Date)	Between
Boolean	Confirmed	Date
Date Format	Different	Digits
Digits Between	E-Mail	Exists (Database)
Image (File)	In	Integer
IP Address	JSON	Max
MIME Types(File)	Min	Not In
Numeric	Regular Expression	Required
Required If	Required Unless	Required With
Required With All	Required Without	Required Without All
Same	Size	String
Timezone	Unique (Database)	URL

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

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@if (count($errors) > 0)

   <div class="alert alert-danger">

      <ul>

         @foreach ($errors->all() as $error)

            <li>{{ $error }}</li>

         @endforeach

      </ul>

   </div>

@endif

Example

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

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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

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<?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

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<html>

   <head>

      <title>Login Form</title>

   </head>

   <body>

      @if (count($errors) > 0)

         <div class="alert alert-danger">

            <ul>

               @foreach ($errors->all() as $error)

                  <li>{{ $error }}</li>

               @endforeach

            </ul>

         </div>

      @endif

      <?php

         echo Form::open(array('url'=>'/validation'));

      ?>

      <table border = '1'>

         <tr>

            <td align = 'center' colspan = '2'>Login</td>

         </tr>

         <tr>

            <td>Username</td>

            <td><?php echo Form::text('username'); ?></td>

         </tr>

         <tr>

            <td>Password</td>

            <td><?php echo Form::password('password'); ?></td>

         </tr>

         <tr>

            <td align = 'center' colspan = '2'

               ><?php echo Form::submit('Login'); ?  ></td>

         </tr>

      </table>

      <?php

         echo Form::close();

      ?>

   </body>

</html>

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

app/Http/routes.php

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

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

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

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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.

Laravel – Response

Laravel – Response A web application responds to a user’s request in many ways depending on many parameters. This chapter explains you in detail about responses in Laravel web applications. Basic Response Laravel provides several different ways to return response. Response can be sent either from route or from controller. The basic response that can be sent is simple string as shown in the below sample code. This string will be automatically converted to appropriate HTTP response. Example Step 1 − Add the following code to app/Http/routes.php file. app/Http/routes.php 1 2 3 Route :: get ( '/basic_response' , function ( ) { return 'Hello World' ; } ) ; Step 2 − Visit the following URL to test the basic response. 1 http : //localhost:8000/basic_response Step 3 − The output will appear as shown in the following image. Attaching Headers The response can be attached t...

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