📄 cardetail-noscript.aspx
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<%@ Page Language="C#" EnableViewState="True" EnableSessionState="True" SmartNavigation="False" %>
<%@Import Namespace="System.Data"%>
<%@Import Namespace="System.Data.SqlClient"%>
<%@ Import Namespace="Microsoft.Web.UI.WebControls" %>
<%@ Register TagPrefix="ie" Namespace="Microsoft.Web.UI.WebControls"
Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<script runat="server">
// -------------------------------------------------------------------
// page-level variable to style sheet size
String sStyleSize = "Standard";
// page-level variable to hold current car ID
String sCarID;
// page-level variable to hold DataSet of values from database
DataSet oCarsDS;
// page-level array to hold current car price and finance terms
// (0) = Basic Price including extras and color option
// (1) = Annual interest rate applicable to purchase
// (2) = Interest amount included in Total Price
// (3) = Total Price including interest for finance plan (if selected)
// (4) = Number of months for finance plan (if selected)
// (5) = Monthly payment amount for finance plan (if selected)
String[] aCurrentPrice = new String[6];
// page-level variable to hold Session key for prices array
String sPricesSessionKey;
// -------------------------------------------------------------------
void Page_Load() {
// get style sheet size from Session
sStyleSize = (String)Session["WccStyleSize"];
// if no value, session has expired or user entered
// site at page other than "Home" page
if (sStyleSize == "") {
// write client-side code that reloads Home page and closes
// window to browser, plus message for non-script clients
String sReload = "<html><body><center>"
+ "<b>Your session has expired.</b><p />"
+ "<b>Please close this window and reload the Home page</b>"
+ "</center></body></html>";
// then prevent rest of page from being processed
Response.Write(sReload);
Response.Flush();
Response.End();
return;
}
// get car ID from query string
sCarID = Request.QueryString["id"];
if (sCarID != "" && sCarID != null) {
// get DataSet from function elsewhere in this page
// we'll also need it almost every time a postback occurs
oCarsDS = GetCarDetailsDS(sCarID);
if (oCarsDS == null) {
lblMessage.Text = "Sorry, the database cannot be accessed.";
btnSave.Visible = false;
return;
}
// specify XML source files and the matching XSLT
// stylesheets for the two asp:Xml controls
// have to do this on every page load as the result
// is not persisted in the viewstate
try {
xmlDetailLeft.DocumentSource = "xmldata/tvdata-left-" + sCarID + ".xml";
xmlDetailLeft.TransformSource = "xmldata/cardetail.xslt";
xmlDetailRight.DocumentSource = "xmldata/tvdata-right-" + sCarID + ".xml";
xmlDetailRight.TransformSource = "xmldata/cardetail.xslt";
}
catch (Exception e) {
lblMessage.Text = "Error loading XML data for car details.";
}
if (Page.IsPostBack) {
// get key for Prices array from the page ViewState
sPricesSessionKey = (String)ViewState["PriceArrayKey"];
// get array of current prices and finance terms from Session
aCurrentPrice = (String[])Session[sPricesSessionKey];
}
else {
// create random key for storing price/finance terms array in
// user's session for this instance of the page, just in case
// they are configuring multiple instances of the same vehicle
Random oRand = new Random();
sPricesSessionKey = "WCCPricesKey" + sCarID + "-"
+ oRand.Next(0, 999).ToString();
// store this key in the ViewState of the page
ViewState["PriceArrayKey"] = sPricesSessionKey;
// display details of this vehicle
ShowCarDetails(sCarID);
// calculate and display price for default configuration
CalculateCarPrice();
}
}
}
// -------------------------------------------------------------------
// routine to show selected car details
void ShowCarDetails(String sCarID) {
// get references to the tables in the DataSet
DataTable oDTCar = oCarsDS.Tables["CarDetails"];
DataTable oDTColor = oCarsDS.Tables["CarColors"];
DataTable oDTExtras = oCarsDS.Tables["CarExtras"];
DataTable oDTFinance = oCarsDS.Tables["FinancePMTRates"];
// fill in Precis and image of car
DataRow oDR = oDTCar.Rows[0];
lblPrecis.Text = oDR["Precis"].ToString();
String sCarName = oDR["Model"].ToString();
imgCar.ImageUrl = "images/" + sCarName + "300.gif";
imgCar.AlternateText = "The Xrox " + sCarName;
elmTitle.InnerText = "Xrox " + sCarName + " - Configure and Buy";
// fill the DataList of colors depending on setting of
// the Standard/Metallic radio buttons
DataView oDTView = oDTColor.DefaultView;
oDTView.RowFilter = "IsMetallic = " + optColorType.SelectedIndex;
dlsColors.DataSource = oDTView;
dlsColors.DataBind();
oDTView.RowFilter = "";
// fill RadioButtonList with available engines
optEngine.DataSource = oDTCar;
optEngine.DataValueField = "EngineID";
optEngine.DataTextField = "EngineName";
optEngine.DataBind();
// fill the DataGrid with the details of each engine
dgrEngine.DataSource = oDTCar;
dgrEngine.DataBind();
// and select the first engine in these two lists
optEngine.SelectedIndex = 0;
dgrEngine.SelectedIndex = 0;
// fill the CheckBoxList with list of available extras
chkExtras.DataSource = oDTExtras;
chkExtras.DataTextField = "DisplayText";
chkExtras.DataValueField = "ExtraID";
chkExtras.DataBind();
lstFinanceMonths.DataSource = oDTFinance;
lstFinanceMonths.DataTextField = "Months";
lstFinanceMonths.DataValueField = "Payment";
lstFinanceMonths.DataBind();
// select the "36 months" entry as the default
lstFinanceMonths.SelectedIndex = 5;
}
// -------------------------------------------------------------------
// routine to update price displayed in window when any options are changed
void CalculateCarPrice() {
Decimal fPrice = 0;
// hide Save button
btnSave.Visible = false;
// clear any existing finance terms from array and page
// routine used is an event handler so have to provide the
// parameters for Sender and EventArgs - we use null as
// these values are not actually used in event handler code
ClearFinanceTerms(null, null);
try {
// create suitable filter to get appropriate row from tblCarEngines
String sFilter = "CarID = " + sCarID + " AND EngineID = "
+ optEngine.SelectedItem.Value;
// get reference to table in DataSet and select matching row
DataTable oDTCar = oCarsDS.Tables["CarDetails"];
DataRow[] aRows = oDTCar.Select(sFilter, "");
// extract price for this car/engine combination
fPrice = (Decimal)aRows[0]["CarEnginePrice"];
// create suitable filter to get appropriate row from tblColors
// using color name set in background of car image cell
sFilter = "Color = '" + tclColor.BgColor + "'";
// get reference to table in DataSet and select matching row
DataTable oDTColors = oCarsDS.Tables["CarColors"];
aRows = oDTColors.Select(sFilter, "");
// if it is a metallic color, add on the premium for this
// stored in web.config here, but could come from a database table
if ((Boolean)aRows[0]["IsMetallic"] == true) {
try {
fPrice += Decimal.Parse(ConfigurationSettings.AppSettings["XroxCarsMetallicPaint"]);
}
catch (Exception e) {
lblMessage.Text = "Error in metallic paint premium in web.config.";
lblPrice.Text = "* Error *";
return;
}
}
// get reference to tblOptionExtra in DataSet
DataTable oDTExtras = oCarsDS.Tables["CarExtras"];
// iterate through the list of Extras to see which are selected
foreach (ListItem oItem in chkExtras.Items) {
if (oItem.Selected) {
// although we specified the ExtraID column as the DataValueField property
// of the CheckBoxList control, it does not render any value attributes.
// Instead so we have to look up the selected items in the original DataSet
// using the DisplayText value from the caption of each button and then
// extract the Price column value - alternatively we could parse it out of
// the Text property (the caption) of the selected item
// create suitable filter to get appropriate row from tblOptionExtra
sFilter = "DisplayText = '" + oItem.Text + "'";
aRows = oDTExtras.Select(sFilter, "");
fPrice += (Decimal)aRows[0]["ExtraPrice"];
}
}
}
catch (Exception e) {
lblMessage.Text = "Sorry, the database cannot be accessed.";
lblPrice.Text = "* Error *";
return;
}
// store total price including extras in array
aCurrentPrice[0] = fPrice.ToString("#,##0.00");
// update Session with new array values
Session[sPricesSessionKey] = aCurrentPrice;
// display price in page
lblPrice.Text = fPrice.ToString("#,##0.00");
// show Save button
btnSave.Visible = true;
}
// -------------------------------------------------------------------
// routine to display finance terms for "Calculate" button
void ShowFinanceTerms(object oSender, EventArgs oArgs) {
// clear any existing finance terms from array and page
ClearFinanceTerms(null, null);
// call function to calculate finance terms values
// returns error message, or empty string string if all OK
String sError = CalculateFinanceTerms();
if (sError == "") {
// display the results in the page
lblTerms.Text = aCurrentPrice[4] + " months at $"
+ aCurrentPrice[5] + " per month";
lblFinanceResult.Text = "<b>Your payments will be $"
+ aCurrentPrice[5].ToString() + " per month for "
+ aCurrentPrice[4].ToString() + " months</b>.";
lblFinanceInfo.Text = "Basic price $" + aCurrentPrice[0]
+ " plus Interest $" + aCurrentPrice[2] + " - Total price $"
+ aCurrentPrice[3] + " - APR " + aCurrentPrice[1] + "%";
// enable the button to cancel these terms
btnCancel.Enabled = true;
// show Save button
btnSave.Visible = true;
}
else {
// display the error details in the page
lblTerms.Text = " ";
lblFinanceResult.Text = "<b>" + sError + "</b>";
lblFinanceInfo.Text = "";
// hide Save button
btnSave.Visible = false;
}
}
// -------------------------------------------------------------------
// function to calculate payment terms from current user selections
String CalculateFinanceTerms() {
Decimal fInterestRate;
Decimal fBasePrice, fTotalInterest, fMonthlyPayment;
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