How to upload a calculated value

Question

I am a beginner Dreamweaver CS4 user and I am building a website with PHP and MySQL.
My issue will be probably easily solved by any experienced DW user but I couldn't find a solution in tutorials and specialized books.
I have to sell a product and I need that customer fills a Purchase Order. To this purpose I have a HTML form with 3 text fields: "UnitPrice", "Quantity" and "TotalPrice". The customer have to fill the "Quantity" field only because the "UnitPrice" is a constant value and the "TotalPrice" is a calculate value. I am using the Insert Record Server Behavior to upload data and I have no problem with the first two fields that are loaded into the MySQL database normally.
My question is, what is the way to calculate the "TotalPrice" ("UnitPrice" multiplied by "Quantity"), put this value in the appropriate field and upload it into the database?
I'll be very grateful to someone who can give me a hand about that.

Answer 1

Here is the full code for that page
<?php require_once('Connections/Registro.php');
mysql_query("SET NAMES utf8")?>
<?php
//initialize the session
if (!isset($_SESSION)) {
  session_start();
?>
<?php
// This is a testing variable only that works well but it needs to change the value "10" for the value inserted by the customer
$SubtotalDispositivos = 39.95 * 10
?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;  
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  return $theValue;
$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1")) {
  $insertSQL = sprintf("INSERT INTO Pedidos_Telefonos (emailusuario, preciounitariodispositivo, cantidaddispositivos, subtotaldispositivos, preciounitarioseguro, cantidadseguro, subtotalseguro, costodispositivos, medioenvio, costoenvio, costoimpuestos, totalapagar) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
                       GetSQLValueString($_POST['emailusuario'], "text"),
                       GetSQLValueString($_POST['preciounitariodispositivo'], "double"),
                       GetSQLValueString($_POST['cantidaddispositivos'], "int"),
                       GetSQLValueString($_POST['subtotaldispositivos'], "double"),
                       GetSQLValueString($_POST['preciounitarioseguro'], "double"),
                       GetSQLValueString($_POST['cantidadseguro'], "int"),
                       GetSQLValueString($_POST['subtotalseguro'], "double"),
                       GetSQLValueString($_POST['costodispositivos'], "double"),
                       GetSQLValueString($_POST['medioenvio'], "text"),
                       GetSQLValueString($_POST['costoenvio'], "double"),
                       GetSQLValueString($_POST['costoimpuestos'], "double"),
                       GetSQLValueString($_POST['totalapagar'], "double"));
  mysql_select_db($database_Registro, $Registro);
  $Result1 = mysql_query($insertSQL, $Registro) or die(mysql_error());
  $insertGoTo = "comprartutelefonoprueba2.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
    $insertGoTo .= $_SERVER['QUERY_STRING'];
  header(sprintf("Location: %s", $insertGoTo));
$colname_DatosIniciales = "-1";
if (isset($_SESSION['MM_Username'])) {
  $colname_DatosIniciales = $_SESSION['MM_Username'];
mysql_select_db($database_Registro, $Registro);
$query_DatosIniciales = sprintf("SELECT emailusuario FROM Registro_Usuarios WHERE emailusuario = %s", GetSQLValueString($colname_DatosIniciales, "text"));
$DatosIniciales = mysql_query($query_DatosIniciales, $Registro) or die(mysql_error());
$row_DatosIniciales = mysql_fetch_assoc($DatosIniciales);
$totalRows_DatosIniciales = mysql_num_rows($DatosIniciales);
?>
<%@LANGUAGE="JAVASCRIPT" CODEPAGE="65001"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><!-- InstanceBegin template="/Templates/masinformacion.dwt" codeOutsideHTMLIsLocked="false" -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<!-- InstanceBeginEditable name="doctitle" -->
<title>Información adicional</title>
<!-- InstanceEndEditable -->
<!-- InstanceBeginEditable name="head" -->
<!-- InstanceEndEditable -->
<link href="oneColLiqCtrHdr.css" rel="stylesheet" type="text/css" />
</head>
<body class="oneColLiqCtrHdr">
<div class="oneColLiqCtrHdr" id="container">
  <div id="header"><a href="http://www.tullaveausa.com"><img src="images/logo azul.jpg" alt="tu-llave-a-USA" width="323" height="77" align="middle" /></a>
    <!-- end #header --></div>
  <!-- InstanceBeginEditable name="Contenido" -->
  <div id="mainContent">
    <h1>Comprar  dispositivo(s) telefónico(s) PRUEBA (último)</h1>
    <form id="form1" name="form1" method="POST" action="<?php echo $editFormAction; ?>">
      <p>Cálculo de costos en Dólares de los Estados Unidos (usar formato con punto decimal y dos dígitos decimales).</p>
      <h3><strong>1. Costo del(los) Dispositivo(s)</strong>
        <input name="emailusuario" type="hidden" id="emailusuario" value="<?php echo $row_DatosIniciales['emailusuario']; ?>" />
        <?php echo $row_DatosIniciales['emailusuario']; ?></h3>
      <blockquote>
        <table width="443" border="1" align="center">
          <caption>
            <strong>Tabla 1. Costo del(los) dispositivo(s) </strong>
          </caption>
          <tr align="center">
            <td width="166"><strong>1. Concepto</strong></td>
            <td width="75"><strong>2. Precio Unitario</strong></td>
            <td width="71"><strong>3. Cantidad</strong></td>
            <td width="103"><strong>4. Subtotal (Col. 2 X Col.3)</strong></td>
          </tr>
          <tr>
            <td>Dispositivo(s) magicJack:</td>
            <td align="center"><input name="preciounitariodispositivo" type="text" id="preciounitariodispositivo" value="39.95" size="8" maxlength="10" readonly="readonly" /></td>
            <td align="center"><input name="cantidaddispositivos" type="text" id="cantidaddispositivos" value="1" size="2" maxlength="2" />
            *</td>
            <td align="center"><input name="subtotaldispositivos" type="text" id="subtotaldispositivos" value="<?php echo $SubtotalDispositivos; ?>" size="8" maxlength="10" readonly="readonly" /></td>
          </tr>
          <tr>
            <td>Seguro por pérdida o daño (opcional)*:</td>
            <td align="center"><input name="preciounitarioseguro" type="text" id="preciounitarioseguro" value="5.00" size="8" maxlength="10" readonly="readonly" /></td>
            <td align="center"></span>
              <input name="cantidadseguro" type="text" id="cantidadseguro" value="0" size="2" maxlength="2" />
            *</td>
            <td align="center"><input name="subtotalseguro" type="text" id="subtotalseguro" size="8" maxlength="10" readonly="readonly" /></td>
          </tr>
          <tr>
            <td colspan="3"><strong>TOTAL DIPOSITIVO(S)</strong> (Suma columna 4):</td>
            <td align="center"><span id="sprytextfield14">
              <input name="totaldispositivos" type="text" id="totaldispositivos" size="8" maxlength="10" readonly="readonly" />
            </span></td>
          </tr>
        </table>
        <blockquote>
          <blockquote>
            <p>Nota: Sólo llenar los campos marcados con * y luego ir a la Tabla 3</p>
          </blockquote>
        </blockquote>
      </blockquote>
      <h3><strong>2. Costo de manipuleo y envío</strong></h3>
      <table width="623" border="1" align="center">
        <tr>
          <th width="228" scope="col">Destino</th>
          <th width="101" align="center" scope="col">Correo aéreo regular*</th>
          <th width="98" align="center" scope="col">Correo aéreo certificado*</th>
          <th width="88" align="center" scope="col">Express Mail Service</th>
          <th width="74" align="center" scope="col">Fed-Ex Courier</th>
        </tr>
        <tr>
          <td scope="row">Estados Unidos (continental)</td>
          <td align="center">6.95</td>
          <td align="center">N/A</td>
          <td align="center">N/A</td>
          <td align="center">N/A</td>
        </tr>
        <tr>
          <td scope="row">México y Canadá</td>
          <td align="center">8.50</td>
          <td align="center">18.50</td>
          <td align="center">29.00</td>
          <td align="center">34.00</td>
        </tr>
        <tr>
          <td scope="row">Centro y Sudamérica (incluye Alaska y Puerto Rico)</td>
          <td align="center">12.00</td>
          <td align="center">22.00</td>
          <td align="center">34.00</td>
          <td align="center">45.00</td>
        </tr>
        <tr>
          <td scope="row">Europa, Asia, África y Oceanía (incluye Hawaii)</td>
          <td align="center">12.50</td>
          <td align="center">22.50</td>
          <td align="center">45.00</td>
          <td align="center">50.00</td>
        </tr>
        <caption>
          <strong>Tabla 2: Costo de manipuleo y envío para 1 ó 2 dispositivos</strong>
        </caption>
      </table>
      <blockquote> </blockquote>
      <h4>3. Costo total </h4>
      <table width="616" border="1" align="center">
        <caption>
          <strong>Tabla 4. Costo total </strong>
        </caption>
        <tr>
          <th width="383" scope="col">Concepto</th>
          <th width="126" align="center" scope="col">Medio de envío elgido</th>
          <th width="85" align="center" scope="col">Costo</th>
        </tr>
        <tr>
          <td colspan="2" align="left" scope="row">Costo del(los) dispositivo(s) (Total Tabla 1.):</td>
          <td align="left"><input name="costodispositivos" type="text" id="costodispositivos" size="8" maxlength="8" readonly="readonly" /></td>
</tr>
        <tr>
          <td align="left" scope="row">Costo de envío (Valor correspondiente Tabla 2 ó 3.):</td>
          <td align="left"><input name="medioenvio" type="text" id="medioenvio" size="15" maxlength="25" />
          *</td>
          <td align="left"><input name="costoenvio" type="text" id="costoenvio" size="8" maxlength="8" />
          *</td>
</tr>
        <tr>
          <td colspan="2" align="left" scope="row">Impuestos (6%):</td>
          <td align="left"><input name="costoimpuestos" type="text" id="costoimpuestos" size="8" maxlength="8" readonly="readonly" /></td>
</tr>
        <tr>
          <th colspan="2" align="left" scope="row">TOTAL A PAGAR (Subtotal + impuestos):</th>
          <td align="left"><input name="totalapagar" type="text" id="totalapagar" size="8" maxlength="8" readonly="readonly" /></td>
</tr>
</table>
      <blockquote>
        <blockquote>
          <blockquote>
            <p>Nota: Sólo llenar los campos marcados con * y luego presionar &quot;Calcular valores&quot;</p>
          </blockquote>
        </blockquote>
      </blockquote>
      <table width="200" border="0" align="center">
        <tr>
          <td align="right"><input type="reset" name="cancelar" id="cancelar" value="Cancelar" /></td>
          <td align="left"><input type="submit" name="calcular" id="calcular" value="Calcular valores" /></td>
        </tr>
      </table>
      <input type="hidden" name="MM_insert" value="form1" />
    </form>
    <hr />
    <p><a href="obtenertutelefono.php">Volver a &quot;obtener un nuevo teléfono&quot;</a> (anulando proceso de compra)</p>
    <p><a href="principalcuenta.php">Volver a tu cuenta</a>
      <!-- end #mainContent -->
      (anulando proceso de compra)</p>
    <p> </p>
    <!-- end #mainContent -->
  </div>
<!-- InstanceEndEditable -->
  <div id="footer">
    <!-- end #footer -->
  </div>
<!-- end #container --></div>
</body>
<!-- InstanceEnd --></html>
<?php
mysql_free_result($DatosIniciales);
?>