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While we re talking about user expectations, we should mention usability. The Ajax approach is fairly new there really aren t any established best practices or heuristics. However, standard Web design principles still apply. As time passes and more people experiment with this approach, we will find the limits and establish guidelines. That said, you should let your users guide you. Depending on how you choose to use Ajax in your application, you may be dynamically changing parts of your page; users who are accustomed to seeing the entire browser refresh may not notice that anything has changed. This issue has led to features such as the Yellow Fade Technique (YFT) popularized by 37signals, as used in the Ajax poster application Basecamp. In a nutshell, YFT says, Take the part of the page that changed, and make it yellow. Assuming yellow is not the dominant color of your application, the user is likely to notice this change. Over time, you fade the yellow color until it returns to the original background color. Obviously, you could choose any color you want; all you are doing is drawing attention to what has changed. Perhaps YTF isn t right for your application; instead, you may choose to alert your users in a less obvious though no less useful manner. Gmail shows a red flashing Loading sign in the upper-right corner to indicate that it is fetching data (see Figure 1-7).

The Web service is written as a TCP-enabled service and is included in a sample solution called StockTraderMSMQReceiver.sln. The solution includes a reference to the System. Messaging assembly, which is not included with WSE 3.0 but is instead a separate assembly within the .NET Framework.

site. When building a site, my initial goal is to provide the client with a foundation to start this process. I never guarantee first-page results no one can but I can promise to provide the tools to get their site there. The goal of this chapter is to discuss the technical aspects of SEO, and as such, I discuss implementation only as it pertains to configuring a site.

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In this section, I discuss several changes that you can make to core Drupal to help improve your SEO ranking. Changes to the .htaccess and robots.txt files are discussed, as well as enabling title and alt fields for images. This section focuses on core Drupal; contributed modules are discussed in the next section.

Whether you need to use YFT or a similar technique is really up to your users The simplest approach is to test it with a group of representative users You could do this using paper-based or Web-based prototypes depending on where you are in the design process, but however you test it, you should get some user feedback before simply introducing complex Ajax usage You should also start small Your first attempt at using Ajax shouldn t be to create a dynamic portal site with adjustable columns Rather, begin by moving client-side validation to the server Once you get the hang of it, begin to venture into more dynamic uses, such as populating a dropdown list or setting some default text However you choose to apply Ajax, remember to not do anything wacky We know that this is not scientific advice.

The Web service provides a Receive method that examines incoming SOAP request messages. All messages with an action value of PlaceTrader are dropped into the message queue. Listing 8-15 provides the code listing for the Receive method and a helper method called AddSoapMessageToQueue. Listing 8-15. A Web Service That Uses MSMQ // This class represents the Request Receiver (i.e., the service) public class StockTraderRequestReceiver : SoapReceiver { protected override void Receive(SoapEnvelope message) { if(message.Context.Addressing.Action.Value.EndsWith("PlaceTrade")) { bool status = false; // Drop the incoming SOAP message to a queue, for later processing status = AddSoapMessageToQueue(message); // Generate a return status message AcknowledgeMessage a = new AcknowledgeMessage(); a.AcceptedToQueue = status; // Transform the result into a SOAP response message SoapEnvelope response = new SoapEnvelope(); response.SetBodyObject(a); // Create the URI address objects for send and receive // Do not hardcode the URIs, pull them from original request message // Send response to the request message's ReplyTo address Uri toUri = (Uri)message.Context.Addressing.ReplyTo; // Return response from the request message's To address Uri fromUri = (Uri)message.Context.Addressing.To; // Assign the addressing SOAP message headers response.Context.Addressing.Action = new Action( "http://www.bluestonepartners.com/schemas/StockTrader/RequestQuote#PlaceTrade"); response.Context.Addressing.From = new From(fromUri); SoapSender soapSender = new SoapSender(toUri); // Send the SOAP request message soapSender.Send(response); } }

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