如何使用PHP中的select选项在textfield中加载更多值

Question

我正在处理的当前项目需要从数据库中检索数据。

我考虑过在html中使用select选项或下拉列表，使用javascript它会在文本字段中追加或设置文本，然后来自数据库的值。

CURRENT RESULT

    function PopulateUserName() {
        var dropdown = document.getElementById("iSupervisor");
        var field = document.getElementById("iSupervisorUserName");
        field.value = dropdown.value;
    }

<?php
     include('connection_phpmyadmin.php');

            $result = $conn->query("select * from company_profile");
            echo '<form action ="func/schedule_add.php" method="POST" enctype="multipart/form-data" >
                            <label>SELECT COMPANY NAME </label>';
            echo '<select name="cp_id" id="iSupervisor" onchange="PopulateUserName()">';
                while ($row = $result->fetch_assoc()) {
                        unset($b_id, $company_name);
                        $cp_id = $row['cp_id'];
                        $company_name = $row['company_name'];
                        $company_code = $row['company_code'];
                            echo '
                                <option value="'.$cp_id.'">'.$company_name.'</option>'; 
                            
                }
                            echo '</select>';
                            echo '   <input id="iSupervisorUserName" name="OBKey_WF_Manger_Supervisor_1" type="text" />';
                            echo " </form>";
?>

我的表格由cols

组成

• cp_id
• COMPANY_NAME
• company_add
• DATE_ADDED

Can you please help me to view company_add and date added in input text field