Laravel Ajax dropdown filter

Question

I´m trying to make a filter using Ajax, I want to display images based on the chosen category in the dropdown, whenever it changes. Right now I´m displaying all images in my view and I want to make an Ajax call that returns the filtered $images array to display in the view. But I´m stuck. I can't figure out how to return the data from the controller correct, so I can access it in the view.

Form with dropdown in the index.blade.php

{{ Form::open( array(
  'route' => 'index.filter',
  'method' => 'post',
  'id' => 'form-filter'
) ) }}

{{ Form::select('category', $categories, 'default', array('id' => 'categories')) }}

{{ Form::close() }}

routes

Route::post( 'filter', array(
  'as' => 'index.filter',
  'uses' => 'MyController@filter'
) );

.js

$( '#form-filter' ).change( function() {

    $.post(
        $( this ).prop( 'action' ),
        {
            "id": $( '#categories' ).val()
        },
        function( data ) {
            alert(data);
        },
        'json'
    );
    return false;
} );

controllers

public function filter()
{
    Log::info(Input::get('id'));

    $id = Input::get( 'id' );

    if($id)
      $images = Image::where('category_id', '=', $id);

    return Response::json($images);
}

public function index()
{
   $images = Image::all();

   $categories = ..\Models\Category::lists('name', 'id');

   return View::make('index', array('images' => $images, 'categories'=>$categories));
}