How Get an array by JSon and how i can set this return value to a modal form?

My Ajax code is

$("a#edit").click(function(){
      var id = $(this).closest('tr').attr('id');
        //alert(id);
$.ajax({
        url: 'getdata.php',
        type: "POST",
        dataType:'JSON',
        data: {
            id: id,
        },
        success:function(result){
            alert(result);
        }
      });
    });

My php code is here...

if ($_REQUEST['id'] != "") 
{
     $id=$_REQUEST['id'];
   $sql = "select * from visit_reports WHERE visit_planner_id='$id'";

        $query = sqlsrv_query( $link, $sql);
        while($data = sqlsrv_fetch_array($query,SQLSRV_FETCH_ASSOC))
            {
              print_r($data);
      }  
  }

In firebug the array i get ..

Array
(
[id] => 1.0000
[visit_planner_id] => 230338
[bi_staff_present_name] => BI staff present name
[bi_staff_trial_function] => BI staff trial function
)

Now how i can use this array value into my specific input field of modal form ?