问从包含来自另一个页面的列表的div传递值

EN

//This script uses jquery and ajax it is used to set the values in
// the time field whenever a day is selected.
$(document).ready(function(){                               
    $("#day").change(function(){                

          var day=$("#day").val();
          var doctor=$("#doctor").val();

          $.ajax({
              type:"post",
              url:"time.php",
              data:"day="+day+"&doctor="+doctor,
              success:function(data){
                 $("#time").html(data);
                 }

          });

    });
});

<select id="doctor">some options</select>
<select id="day">some options</select>
<div id="time"> </div>

   //The php script for insertion

    <?php
session_start();                  //Use this to include session variables
$con=mysqli_connect("localhost","clinic","myclinic","myclinic");
    // Check connection

    if (mysqli_connect_errno())
    {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    $query = "INSERT INTO appointment(username, doctor, day, time) VALUES('$_SESSION[username]', '$_POST[doctor]', '$_POST[day]', '$_POST[time]')";

    if (!mysqli_query($con,$query))
    {
        die('Error: ' . mysqli_error($con));
    }


    mysqli_close($con);
    header("location:login_success.php");
         ?>