How to develop an online voting system using Laravel

How to use Laravel to develop an online voting system

Introduction:
With the development of the Internet, more and more things can be done online, including vote. Online voting systems can collect opinions and feedback from a large number of users conveniently and efficiently. This article will introduce how to use the Laravel framework to develop a basic online voting system and provide specific code examples.

1. Environment setup and Laravel installation:

1. Make sure PHP and Composer are installed on your machine. If not, please install it first.
2. Open a command line window and use Composer to install Laravel:
   composer global require laravel/installer
3. After the installation is complete, enter the following command in the command line to create A new Laravel project:
   laravel new votingsystem
4. Enter the project directory:
   cd votingsystem
5. Start the Laravel development server:
   php artisan serve
6. Open the browser and visit http://localhost:8000. If you see the Laravel welcome page, it means the environment is set up successfully.

2. Database preparation:

1. In the project root directory, open the .env file and configure the database connection information. Modify the following lines:

   DB_CONNECTION=mysql
   DB_HOST=127.0.0.1
   DB_PORT=3306
   DB_DATABASE=voting_system
   DB_USERNAME=root
   DB_PASSWORD=

2. Create a database named voting_system.

3. Create voting-related models, migrations and controllers:

1. Enter the following commands on the command line to create a Poll model and Corresponding data migration file:
   php artisan make:model Poll -m

2. In the generated migration file, define the fields of the polls table :

   public function up()
   {
       Schema::create('polls', function (Blueprint $table) {
           $table->id();
           $table->string('title');
           $table->timestamps();
       });
   }

3. Run database migration:
   php artisan migrate

4. Create a PollController controller and add create and store methods:

   php artisan make:controller PollController --resource

5. In PollController, add create and store Implementation of methods to facilitate creating and saving votes:

   <?php
   
   namespace AppHttpControllers;
   
   use IlluminateHttpRequest;
   use AppPoll;
   
   class PollController extends Controller
   {
       public function create()
       {
           return view('polls.create');
       }
   
       public function store(Request $request)
       {
           $this->validate($request, [
               'title' => 'required'
           ]);
   
           $poll = Poll::create([
               'title' => $request->title
           ]);
   
           // 添加投票选项
           foreach($request->options as $option) {
               $poll->options()->create([
                   'name' => $option
               ]);
           }
   
           return redirect()->route('poll.show', $poll->id);
       }
   }

6. Create Option model and corresponding data migration files:
   php artisan make:model Option -m

7. In the generated Option migration file, define the fields of the options table:

   public function up()
   {
       Schema::create('options', function (Blueprint $table) {
           $table->id();
           $table->unsignedBigInteger('poll_id');
           $table->string('name');
           $table->timestamps();
       });
   }

8. Run database migration:
   php artisan migrate

9. In the Poll model, add the Option Model association:

   public function options()
   {
       return $this->hasMany(Option::class);
   }

IV. Create views and routes:

1. In the resources/views directory, Create a folder called polls and create a create.blade.php view file in it:

   <form action="{{ route('poll.store') }}" method="POST">
       @csrf
       <label for="title">标题：</label>
       <input type="text" name="title">
   
       <label for="options">选项：</label>
       <ul id="options">
           <li>
               <input type="text" name="options[]">
           </li>
       </ul>
       <button id="add-option" type="button">添加选项</button>
   
       <button type="submit">提交</button>
   </form>
   
   <script>
   document.getElementById('add-option').addEventListener('click', function() {
       var option = document.createElement('li');
       option.innerHTML = '<input type="text" name="options[]">';
       document.getElementById('options').appendChild(option);
   });
   </script>

2. atroutes/web.php file, add the following route:

   Route::resource('poll', 'PollController');

3. Run the following command on the command line to refresh the route cache:
   php artisan route:cache

5. Test:

1. Open the browser and visit http://localhost:8000/poll/create.
2. Enter the voting title and options, and click the "Add Option" button to dynamically add options.
3. After completing the filling, click the "Submit" button, the system will save the vote to the database and jump to the voting details page.

Conclusion:
This article introduces how to develop a basic online voting system using the Laravel framework. By configuring the environment, creating models, migrations and controllers, and writing views and routes, we implemented basic voting functionality. You can further expand and improve the system on this basis, such as adding functions such as user authentication and display of voting results. I hope this article will be helpful to your Laravel development journey.

(Note: The above code examples are for reference only, please make appropriate adjustments according to the actual situation.)

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