jquery，如何用另一个选择框值填充选择框

i want a selected value of a select box to pull data from database and populate it in another select box

test.php contains the display:

<form role="form"> <div class="form-group"> <label
for="division_1">Fruits</label> <select id="division_1"
class="form-control division_1" name="division_1">

<?php $q = mysqli_query($dbc,"SELECT * FROM division_tbl");
while($data = mysqli_fetch_assoc($q)){ 
    ?> <option value="<?php echo $data['id'] ?>">
    <?php echo $data['division_name'] ?></option> 
<?php } ?> 
</select> <div class="form-group"> <label for="block">Block</label>
<select id="block" class="form-control fruits" name="block">

</select> </div> </form>

and this is the jquery js file

$(".division_1").change(function(){  var division_1 =
$('select[name=division_1]');  var data = 'division_1=' +
division_1.val();

 $.ajax({  url: "config/ajax/send_value.php",  type: "POST",  data:
data,  success: function(data) {  Blocks();  }  }  });  return false; 
});

  //blocks


function Blocks(){  
    $('#block').empty(); 
    $('#block').append("Loading");  
    $.ajax({  
        type: "POST",  
        url: "config/ajax/send_value.php",  
        contentType:"application/json; charset=uft-8",  dataType:"json",  
        success: function(data){
            $('#block').empty();  
            $('#block').append("Select block"); 
            $.each(data,function(i, item){  
                $('#block').append(''+ data[i].name
            +'');  });  
        },  complete: function(){  }  });  
}

});

and this is the php post and receive files

if (isset($_POST['division_1'])){
     $q = mysqli_query($dbc,"SELECT * FROM block_tbl WHERE id =
    '$_POST[division_1]'");

     if (mysqli_num_rows($q)) {
        $data = array();  
        while ($rows =  mysqli_fetch_assoc($q)){
            $data[] = array(  'id' => $rows['id'], 'name' => $rows['block_name']);  
        }
        header('Content-type: application/json');  echo json_encode($data); 
    }
}

Are you talking about this kind of drop-down list : demo