Dependent Dropdown

Example of Select Region After Selecting State

   public function showFormFunction()
    {
	$states = State::lists('display_name', 'id');
	$regions = ['Please select state first'];
	return view('dashboard', compact(['states']))
		    ->with('regions', $regions);
    }

HTML Form Code

   <div class="form-group">
      {!! Form::label('state_id', 'State : ', array('class' => 'col-md-2 control-label')) !!}
      <div class="col-md-4">
	  {!! Form::select('state_id', $states ,null, array('class' => 'form-control', 'required', 'id' => 'state_id')) !!}
      </div>
   </div>

   <div class="form-group">
      {!! Form::label('region_id', 'Region : ', array('class' => 'col-md-2 control-label')) !!}
      <div class="col-md-4">
	  {!! Form::select('region_id', $regions, null, array('class' => 'form-control', 'required', 'id' => 'region_id')) !!}
      </div>
   </div> 

Ajax Javascript Code

==============================================================================

     <script type="text/javascript">
	//depandable dropdown start
	$('#state_id').on('change', function(e){

	    var state_id = e.target.value; // get the value of state feild 
	    var apiUri =  "<?php echo URL::route('api.region'); ?>";
	    // AJAX GET Request
	    $.get(apiUri+'?state_id='+state_id, function(data){
		//success data
		$('#region_id').empty();
		$('#region_id').append('<option value=""> Please choose one</option>');
		// populate data
		$.each(data, function(key, value) {
		    var option = $("<option></option>")
			.attr("value", key)
			.text(value);
		    $('#region_id').append(option);
		});

	    });
	});
	//depandable dropdown end
      </script>
==============================================================================

Api route

  	Route::get('api/section-dropdown', array('as' => 'api.region', 'uses' => 'Api\ApiController@sectionDropDownData'));

In ApiController

   public function sectionDropDownData()
    {
	$state_id = \Input::get('state_id');

	if($state_id) {
	    $regions = Region::where('state_id', $state_id)->lists('region_code', 'id');
	    return \Response::json($regions);
	}
    }

==============================================================================

You are Good to Go. Thanks