Dynamic dropdown in Laravel, let's say you have multiple drop downs (selects), you click on one and the contents of the other need to be dynamically changed. One solution is to dynamically load JSON from the API and change the dropdown dynamically depending on the user choice.

DB.sql

CREATE TABLE `makers` (
  `id` int(10) unsigned NOT NULL,
  `name` varchar(255) NOT NULL,
  `description` varchar(255) NOT NULL,
  `created_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `makers`
--

INSERT INTO `makers` (`id`, `name`, `description`, `created_at`, `updated_at`) VALUES
(1, 'Toyota', 'Toyota cars', '2013-03-11 00:00:00', '2013-03-11 00:00:00'),
(2, 'Honda', 'Honda cars', '2013-03-11 00:00:00', '2013-03-11 00:00:00'),
(3, 'Mercedes', 'Mercedes cars', '2013-03-11 00:00:00', '2013-03-11 00:00:00');

-- --------------------------------------------------------

--
-- Table structure for table `models`
--

CREATE TABLE `models` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `maker_id` int(10) unsigned NOT NULL,
  `name` varchar(255) NOT NULL,
  `description` varchar(255) NOT NULL,
  `created_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=11 ;


INSERT INTO `models` (`id`, `maker_id`, `name`, `description`, `created_at`, `updated_at`) VALUES
(1, 2, 'Honda S2000', '', '2013-03-11 22:32:07', '2013-03-11 22:32:07'),
(2, 2, 'Civic', '', '2013-03-11 22:32:46', '2013-03-11 22:32:46'),
(3, 2, 'Fit', '', '2013-03-11 22:34:35', '2013-03-11 22:34:35'),
(4, 1, 'asdf asdf', '', '2013-03-11 22:35:31', '2013-03-11 22:35:31'),
(5, 1, 'Yaris', '', '2013-03-11 22:36:01', '2013-03-11 22:36:01'),
(6, 1, 'Corolla', '', '2013-03-11 22:36:23', '2013-03-11 22:36:23'),
(7, 1, 'Camry', '', '2013-03-11 22:36:31', '2013-03-11 22:36:31'),
(8, 3, 'SLK 500', '', '2013-03-11 22:36:47', '2013-03-11 22:36:47'),
(9, 3, 'C300', '', '2013-03-11 22:36:50', '2013-03-11 22:36:50'),
(10, 2, 'another item', '', '2013-03-11 22:36:52', '2013-03-11 22:36:52');

maker.php

<?php

   class Maker extends Eloquent {
      public function models(){
         return $this->has_many('Model');
      }
   }

?>

model.php

<?php

   class Model extends Eloquent {
      public function maker(){
         return $this->belongs_to('Maker');
      }
   }

?>

routes.php

Route::get('api/dropdown', function(){
  $input = Input::get('option');
	$maker = Maker::find($input);
	$models = $maker->models();
	return Response::eloquent($models->get(['id','name']));
});

script.js

jQuery(document).ready(function($){
  	$('#make').change(function(){
			$.get("{{ url('api/dropdown')}}", 
				{ option: $(this).val() }, 
				function(data) {
					var model = $('#model');
					model.empty();
 
					$.each(data, function(index, element) {
			            model.append("<option value='"+ element.id +"'>" + element.name + "</option>");
			        });
				});
		});
	});

view.blade.php

<h1>Dropdown demo</h1>
      	{{ Form::open() }}
    		    <select id="make" name="make">
    		    	<option>Select Car Make</option>
    		        <option value="1">Toyota</option>
    		        <option value="2">Honda</option>
    		        <option value="3">Mercedes</option>
    		    </select>
    		    <br>
    		    <select id="model" name="model">
    		    	<option>Please choose car make first</option>
    		    </select>
    		{{ Form::close();}}