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Then, all you have to do is implement the callback function to inform the page (or user) of the results of the service call. This is where the number returned from the service is displayed in an alert dialog:

The user of the form can, however, ignore this restriction, and the loaded document can now have invalid data This makes it necessary to revalidate the changes made to the document Fortunately, the XmlDocument class provides a method called Validate() that does the job Listing 5-17 shows the use of Validate() during the update operation..

You will need to specify a set of Java source files for XDoclet to use to generate the portletxml The <portletdoclet> task needs an Ant file set for the project s Java source code files These can be anywhere, but in our Java build file, we used the regular source directory, with all Java classes If your portlets are in one or two packages, or all of your portlet class names end in Portlet, you can use a more specific filter for the Ant file set include Alternatively, you may also exclude certain classes from the file set if you have portlets with XDoclet markup that are not going to be deployed on the portal in this build This could be useful in a scenario where you make different portlet application builds for production servers and development machines with the same Ant build file and source control repository.

function onResult(result) { alert(result); }

The only subtask for the <portletdoclet> task is the <portletxml> subtask The <portletxml> subtask will generate the portletxml from the XDoclet tags in the Java source code Behind the scenes, it is filling in an XDoclet template with the correct information The XDoclet template for portletxml is called portlet_xmlxdt, and it is available in the XDoclet source distribution or in the XDoclet portlet module JAR file You do not ever need to edit this template, but if you are curious about how XDoclet works, the template is easy to understand The create-portlet-xml target is a dependency of our default Ant target, build-war, and it runs after compilation That way, if our compilation fails, the build file does not generate a portletxml:.

Listing 5-17. Validating a Node Explicitly private void button2_Click(object sender, EventArgs e) { XmlNode node = doc.SelectSingleNode("//employee[@employeeid='" + comboBox1.SelectedItem + "']"); if (node != null) { node.ChildNodes[0].InnerText = textBox1.Text; node.ChildNodes[1].InnerText = textBox2.Text; node.ChildNodes[2].InnerText = textBox3.Text; XmlCDataSection notes = doc.CreateCDataSection(textBox4.Text); node.ChildNodes[3].ReplaceChild(notes, node.ChildNodes[3].ChildNodes[0]); } doc.Validate(OnValidationError,node); if (!isError) { doc.Save(Application.StartupPath + "/employees.xml"); } } Note the code marked in bold. The Validate() method of XmlDocument can validate the entire document or just a node against a previously specified schema or DTD. The Validate() method accepts two parameters: the name of a function that matches the ValidationEventHandler delegate signature and the XmlNode to validate. There is one more overload of Validate() that takes just a function matching the ValidationEventHandler delegate signature and validates the entire document. The OnValidationError function is shown in Listing 5-18. Listing 5-18. The OnValidationError Function void OnValidationError(object sender, ValidationEventArgs e) { MessageBox.Show(e.Message); isError = true; } The function simply shows the error message in a message box and sets a class-level Boolean variable isError to true. This variable is checked to decide whether to save the document. To test the application, modify the phone number of any employee to more than 20 characters and click the Update button. You should see a message box similar to the one shown in Figure 5-19.

Despite our concerns with the implementation of user attributes, they raise no concerns for the developer from an ease-of-use perspective.

.NET AJAX gives you the facility to call In addition to accessing web services, ASP .NET 2.0 forms authentication and profile services directly from JavaScript. This ASP