Page takes two refreshes for table data to update PHP+HTML

Question

I am trying to make an edit function for my table (pulls from mysql). In a nutshell the way it works is when you click on an edit button it turns specific text into an input field. A save button also appears next to the field. The problem I'm having when you click on the 'save' button the page reloads but the table data does not update. I have to reload the page again for the table data to update. Here is my php/mysql insert code:

// DEFINING POST VARIABLES
$u_first = $_POST['U_firstname'];
$u_last = $_POST['U_lastname'];
$find_id = $_POST['sid'];

// QUERY DEFINING WHAT TO UPDATE
$query = "UPDATE studentdata SET firstname = ? , lastname = ? WHERE userid = ?";

// PREPARE STATEMENT    
$statement = $mysqli->prepare($query);

//BIND parameters for markers
$results =  $statement->bind_param('ssi', $u_first, $u_last, $find_id);
$statement->execute();
$statement->close();

I'm not sure if this matters but here is my table code too:

    while($row = $query_results->fetch_array()) {

    // CONVERTS FIRST & LAST NAME INTO A SINGLE VARIABLE
    $NN_first = $row["firstname"];
    $NN_last = substr($row["lastname"], 0, 1);
    $NN_full = $NN_first.' '.$NN_last;

    // PRINTING TABLE ROW
        print '<tr>';
    // MAKING FORM
        print '<form action="example.php" method="POST">';
    // GETS/MAKES HIDDEN USER ID
        print '<input type="hidden" name="sid" value="'.$row["userid"].'">';
    // PRINTS FULL NAME VARIABLE
        print '<td>'.$NN_full.'</td>';
    // PRINTS UPDATE BUTTON
        print '
        <td class="textcenter">
            <input type="submit" class="example-page-btn" name="Update'.$row["userid"].'" value="Update">
            <input type="submit" class="example-page-btn" name="Delete" value="Delete">
        </td>';
    // PRINTS FORM CLOSE
        print '</form>';
    // PRINTS END TABLE ROW
        print '</tr>';

}

Answer 1

Make a JSON by your mysql table data and append the data in your table. After successful entry/update , update your JSON.