问使用modal在while循环中POST或获取PHP值

EN

<?php while($row = mysqli_fetch_array($result)) {  ?>

 $id_friend = $row['id_friend'];

 $firstName = $row['firstName'];


<table>
<tr>
<td><a><?php echo $firstName;  ?></a></td>
<td>

<!-- opens modal -->

<a href="#" id="<?php echo $row['friend_id'];?>" onclick="show(this.id)" >open </a>

<!-- modal -->

<div id="myNav2" class="overlay2">

<a href="javascript:void(0)" class="closebtn2" 
onclick="closeNav233()">&times;</a>

  <div class="overlay2-content">
     <div>
<form  action="getuser2.php" method="POST">
<button  name="friend_id" value="<?php echo $id_friend; ?>" 
type="submit">MESSAGE</button>
<input  class="friend_id" type="hidden" name="friend_id" value="<?php echo 
$id_friend; ?>" >
</form>
     </div>
  </div>
</div>

</td>
</tr>

<?php
 } //end of while loop
?> 

</table>

<script>
function show() {

document.getElementById("myNav2").style.width = "100%"; //opens modal

option = $(this).attr('id');
console.log(option ); //to check clicked id is Ok

$.ajax({
    url: 'testmodal.php',
    type: 'GET',
    data: {option : id},
    success: function(data) {
    alert($(this).data('id'));
    document.getElementById('myNav2').innerHTML =data;
    }
});

}

</script>

<style>
body {
font-family: 'Lato', sans-serif;
}

.overlay2 {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: rgb(0,0,0);
background-color: rgba(0,0,0, 0.9);
overflow-x: hidden;
transition: 0.5s;
}

.overlay2-content {
position: relative;
top: 25%;
width: 100%;
text-align: center;
margin-top: 30px;
}

.overlay2 a {
padding: 8px;
text-decoration: none;
font-size: 36px;
color: #818181;
display: block;
transition: 0.3s;
}

.overlay2 a:hover, .overlay2 a:focus {
color: #f1f1f1;
}

.overlay2 .closebtn2 {
position: absolute;
top: 20px;
right: 45px;
font-size: 60px;
}

@media screen and (max-height: 450px) {
  .overlay2 a {font-size: 20px}
  .overlay2 .closebtn2 {
  font-size: 40px;
   top: 15px;
  right: 35px;
 }
 }
</style>

<script>

function closeNav233() {
document.getElementById("myNav2").style.width = "0%";
}
</script>