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<!DOCTYPE html>
<!--[if lt IE 7 ]><html class="ie ie6" lang="en"> <![endif]-->
<!--[if IE 7 ]><html class="ie ie7" lang="en"> <![endif]-->
<!--[if IE 8 ]><html class="ie ie8" lang="en"> <![endif]-->
<!--[if (gte IE 9)|!(IE)]><!--><html lang="en"> <!--<![endif]-->
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta charset="utf-8">
<title>Internal</title>

<style>
html {
    background-image: url("WDF_2493417.jpg");
    background-size: 100% 100%;
    background-repeat: no-repeat;
    background-position: center;
}

html {
  margin: 0;
  padding: 0;
  height: 100%;
}
</style>

</head>

<body >

<?php

// php populate html table from mysql database

$conn = mysqli_connect("localhost","root","");
mysqli_select_db($conn, "my_db");
$result = mysqli_query($conn,"SELECT * FROM ijob ORDER BY userId DESC");
?>

<div class="form-style-1">
<form name="frmUser" method="post" action="">
<div style="width:1200px;">
<table border="0" cellpadding="10" cellspacing="1" width="1200" class="tblListForm" align="center">
<tr class="listheader">
<td></td>
<th>first name</th>
<th>last name</th>
<th></th>
</tr>
<?php
$i=0;
$j=1;
while($row = mysqli_fetch_array($result)) {
if($i%2==0){
$classname="evenRow";
} else {
 $classname="oddRow";
}
?>
<tr class="<?php if(isset($classname)) {
 echo $classname;
 }?>">
<td><input type="checkbox" name="users" value="<?php echo $row["userId"]; ?>" ></td>
<td><?php echo $row["fname"]; ?></td>
<td><?php echo $row["lname"]; ?></td>
<th colspan="4"><input type="button" name="update" class="button" value="Apply" onClick="checkAddress(this);" /></th></tr>
<?php
$i++;
$j=$i+1;
}
$conn->close();
?>
</table>
</div>
</form>

</div>

</body>
<script>
function checkAddress()
{
    if (document.querySelector('form[name="frmUser"] input[type="checkbox"]:checked')) {

if(!empty($_POST['users'])){
  <?php
       $servername = "localhost";
       $username = "root";
       $password = "";
       $dbname = "my_db";

   // Create connection
      $conn = new mysqli($servername, $username, $password, $dbname);
   // Check connection
     if ($conn->connect_error) {
           die("Connection failed: " . $conn->connect_error);
      }
$num_var= " ";
$num_var = mysqli_real_escape_string($conn,$_POST['users']); // getting error on this Line.

$query = "SELECT fname FROM ijob WHERE userId='$num_var'";
$result = mysqli_query($conn,$query);
if (!$result) {
    echo 'MySQL Error: ' . mysqli_error($conn);
    exit;
}

    if ($result->num_rows > 0) {
        // output data of each row
      while($row = $result->fetch_assoc()) {
          $fnames[] = $row['fname'];
          ?>
        alert("Hello <?php echo $fnames;?>");

<?php
}

  }
  $conn->close();

    ?>
    }
        document.frmUser.action = "form.php";
    document.frmUser.submit();
    } else {
        alert("Pl select checkbox which You wish to Apply ");
    }
}
</script>

</html>