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Now that you have created the Ecommerce web service, you are ready to consume it in a client application. To do so, add a new website to the web service project you just created. Add three web forms to the website: Default.aspx, ShoppingCart.aspx, and Success.aspx. The Default.aspx web form will act as a product catalog and displays a list of products. Users can add items from the product catalog to their shopping cart. The shopping cart is displayed on ShoppingCart.aspx. Users can add, modify, or remove selected items here. When the order is placed successfully, the Success.aspx web form displays a success message to the end user.

We describe how to use the PortletRequest object s getAuthType(), getRemoteUser(), isUserInRole(), and getUserPrincipal() methods in 8. The portlet security model is similar to the servlet security model, although security roles are in the portlet deployment descriptor.

The timeline will be created, and a new timeline will start recording. This is a neat feature that allows you to define your animations and how they will run by setting the various properties that you want to animate visually. We want the list box to fly in from the left as it fades in from invisible to visible, so you should drag it off the left-hand side of the screen now and set its opacity to 0. On the timeline, you will see that a key marker is set on the list box at time 0 (see Figure 8-29).

The render() method on the Portlet interface takes a RenderRequest object as one of the arguments. RenderRequest extends PortletRequest, but adds no additional methods in version 1.0 of the portlet API.

In complex cases, you may want to search for a node matching a pattern. This is accomplished with the help of XPath. Though XPath is not the subject of this chapter, I will give you a glimpse of how it can be used. I will explain XPath fully in 4. The XmlDocument class has a method called SelectNodes() that accepts the XPath criteria for filtering the available nodes. It returns an XmlNodeList containing the matching nodes. To see how the SelectNodes() method works, we need to develop a Windows application as shown in Figure 2-6. The application consists of a text box for entering the first name or last name of an employee. The radio buttons allow you to choose whether to look for matching first names or last names. Upon clicking the Search button, the SelectNodes() method is called. The returned <employee> nodes are collected in an XmlNodeList. The combo box displays the list of matching employee IDs. You can select an employee ID and click the Show Details button to display the employee details. If you look at the source code of the application, you will find a declaration of a variable of type XmlNodeList at the form level: XmlNodeList list = null; We declare the variable at the form level because it is used in multiple event-handler functions.

You can select any of the detected components from the Choose Toolbox Items dialog box, or use the Browse button to browse to the assembly that contains the component you want to add. To add the component to your Toolbox, simply select the check box beside it and click OK. Now, to use controls in your Toolbox, simply drag them from the Toolbox to the design surface of your page. When we ve finished the IDE tour, you ll build a simple application by doing just this.

The request object passed to the processAction() method on the Portlet interface is an action request, represented by the ActionRequest interface. ActionRequest extends the PortletRequest interface and adds several methods. Two methods exist for reading the body of an HTTP request, getReader() and getPortletInputStream(). Both of these methods will throw an

IllegalStateException if the HTTP POST was from a form with the application/ x-www-form-urlencoded Multipurpose Internet Mail Extensions (MIME) type, because the portlet container translated the body of the request into the portlet request parameters. Once the body is read by the portlet container, the getReader() method, or the getPortletInputStream() method, it is unavailable to be read by another method.

Figure 2-6. Using the SelectNodes() method The Click event handler of the Search button is shown in Listing 2-9. Listing 2-9. Using the SelectNodes() Method private void button1_Click(object sender, EventArgs e) { XmlDocument doc = new XmlDocument(); doc.Load(Application.StartupPath + "/employees.xml"); if (radioButton1.Checked) { list = doc.SelectNodes(string.Format ("//employee[./firstname/text()='{0}']",textBox1.Text)); } else { list = doc.SelectNodes(string.Format ("//employee[./lastname/text()='{0}']",textBox1.Text)); } foreach (XmlNode node in list) { comboBox1.Items.Add(node.Attributes["employeeid"].Value); } }