Get PHP Modal Window Data

Clicking on unit opens a table inside the modal that from the user's choice inserts the desired line in the input. But when I click on any line the whole table value is inserted. Does anyone know what I should change in javascript?

<div class="container">
                <h2>Modal</h2>
                <!-- Trigger the modal with a button -->
                        <button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">Unidade</button>
                        <input type="text" class="form-control unidade">
                        <!-- Modal -->
                        <div class="modal fade" id="myModal" role="dialog">
                            <div class="modal-dialog">

                                <!-- Modal content-->
                                <div class="modal-content">
                                    <div class="modal-header">
                                        <button type="button" class="close" data-dismiss="modal">&times;</button>
                                        <label class="modal-title">UNIDADE</label>

                                    </div>
                                    <div class="modal-body">
                                        <table id="unidade">
                                            <?php
                                                  include ("conn.php");

                                                        echo "<table border = 2>";
                                                        echo "<tr>";
                                                        echo "<th>Unidade</th>";
                                                        echo "<th>Descrição</th>";
                                                        echo "</tr>";

                                                    $result = "SELECT codigo, descricao FROM cadunid";
                                                    $resultado = mysqli_query($conn, $result);

                                                    while($row = mysqli_fetch_assoc($resultado)) {
                                                        echo "<tr>";
                                                        echo "<td value='unidade'>". $row['codigo'] ."</td>";
                                                        echo "<td>". $row['descricao'] ."</td>";
                                                        echo "</tr>";
                                                    }
                                                ?>
                                        </table>
                                    </div>
                                    <div class="modal-footer">
                                        <button type="button" class="btn btn-default" data-dismiss="modal">Fechar</button>
                                    </div>
                                </div>

                            </div>
                        </div>
                    </div>

                    <script>
                        $(document).on('click', 'table', function() {
                            var value = $(this).val(unidade).text();
                            $('.close').trigger('click');
                            $('.unidade').val(value);
                        });
                    </script>