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A central tenant of usability says you should prevent errors from occurring, but barring that, you should inform your users of errors as soon as possible Before Ajax, Web-based applications had to post the entire page to validate the data or rely on complex JavaScript to check the form While some checks are fairly simple to write in JavaScript, others just plain can t be done Of course, every validation routine you write on the client has to be rewritten on the server anyway since it s possible a user has JavaScript turned off With Ajax, you no longer have to confine yourself to simple client-side validations and duplicated logic Now when you want to provide a more responsive experience for your users, you can simply call the validation routine you wrote for the server.

The previous version of the StockTrader Web service implemented an IDC file for operations and types. This file is no longer needed because the same information is now provided by the definition assembly. Create a new Web service project named StockTraderContracts in the Visual Studio 2005 solution, and rename the .asmx file to StockTraderContracts. Use the Add Reference dialog box to set references to the StockTraderBusiness and StockTraderTypes assemblies. Listing 4-4 displays the pseudocode listing for the StockTraderContracts Web service. Listing 4-4. Pseudocode Listing for the StockTraderContracts Web Service using using using using System.Web; System.Web.Services; System.Web.Services.Protocols; System.Web.Services.Description;

Figure 4-5. Display settings determine if author and date information will be automatically displayed on a node.

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In most cases, this logic will be simpler to write and easier to test, and it s likely you can rely on existing frameworks When we re asked where people should start using Ajax in their applications, we typically recommend starting with validation Chances are pretty good you ve got some JavaScript you d like to get rid of, and you can probably easily tie into some existing server-side logic In this section, we ll show an example of one of the most common validations: dates The HTML for this example is pretty straightforward (see Listing 4-1) You have a standard input box with an onchange() event (of course, you could use whatever event you think is appropriate) that triggers the validation method You can see that you re calling the standard createXMLHttpRequest() method and then sending the input value to the ValidationServlet servlet.

The Comment se ttings tab has a number of options that can be configured at the content type level (see Figure 4-6); keep in mind these are default settings and can be updated by users with the appropriate permissions Comments can either be Open, Closed, or Hidden Hidden comments means users cannot add or view comments, while Closed comments means users can view previous comments but cannot add one; I recommend setting this as either Open or Hidden and then allowing site administrators to close comments if required Please note that changing this setting to Closed (or vice versa) will not affect previously created nodes Comments can be displayed either as a straight list or as threaded A threaded list groups comments according to replies; if a user posts a comment and three people reply to that comment, those four posts are considered a thread and grouped together.

using StockTraderTypes; using StockTraderBusiness; namespace StockTrader { public class StockTrader : System.Web.Services.WebService, StockTraderTypes.IStockTrader { [WebMethod] [SoapDocumentMethod(RequestNamespace= "http://www.bluestonepartners.com/schemas/StockTrader/", ResponseNamespace="http://www.bluestonepartners.com/schemas/StockTrader/", Use=SoapBindingUse.Literal, ParameterStyle=SoapParameterStyle.Bare)] [return: System.Xml.Serialization.XmlElement("Quote", Namespace= "http://www.bluestonepartners.com/schemas/StockTrader/")] public Quote RequestQuote(string Symbol) { // Implementation code not shown } [WebMethod] //XML and SOAP serialization attributes not shown public Trade PlaceTrade(string Account, string Symbol, int Shares,

When displaying comments, Drupal automatically includes a pager (that is, it includes links to page 1 of comments, page 2 of comments, and so on) to view additional comments when the number in the Comments per page setting is exceeded The Allow comment title check box adds a comment title field in the comment form, allowing users to create a custom title for their comment If the check box is deselected, Drupal creates a title for the comment based on the first 29 characters of the comment The comment form can appear either on the same page as the node or on a separate page Deselecting the Show reply form on the same page as comments check box displays an Add new comment link at the bottom of a node directing users to a second page to add comments.

The callback() function gets the results from the server and then delegates to the setMessage() method, which looks at the values to determine in which color the message should be displayed..

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