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However, ASP.NET doesn t isolate you from XHTML altogether. In fact, a typical ASP.NET web page mingles ASP.NET web controls with ordinary XHTML content. When that page is processed by the web server, the ASP.NET web controls are converted to XHTML markup (a process known as rendering) and inserted into the page. The final result is a standard XHTML document that s sent back to the browser. This design gives you the best of both worlds you can mix ordinary XHTML markup for the parts of your page that don t change, and use handy ASP.NET web controls for the parts that need to be interactive (such as buttons, lists, text boxes, and so on) or the parts that you need to update with new information (for example, a block of dynamic text). This design also suggests that ASP.NET developers should have a solid understanding of XHTML basics before they begin coding web forms. The following sections provide a brief overview that introduces you to the XHTML standard (or refreshes your memory, if you ve learned it before). If you already know all you want to know about XHTML, feel free to skip ahead to the next section, Writing Code.

To finish our exercise, we need to add form validation. When the user doesn t enter a phrase, we would like to take the user back to the form. We ll do this by first adding a result tag to the uppercaser.action event handler that states that Model-Glue should redirect to the uppercaser.form event-handler whenever a result named validationError is added. Listing 27-11 contains this code to add to ModelGlue.xml. Listing 27-11. Returning to the form when there s a validationError result <event-handler name="uppercaser.action"> <broadcasts> <message name="needUpperCasedPhrase" /> </broadcasts> <views> <include name="body" template="dspUpperCasedPhrase.cfm" /> </views> <results> <result name="validationError" do="uppercaser.form" redirect="true" /> </results> </event-handler> Now, we ll modify our listener function to perform basic validation, adding a validation message and the validationError result if the inputted phrase is zero length. Listing 27-12 showcases this basic validation. Listing 27-12. Adding basic validation to the listener function <cffunction name="UpperCasePhrase" output="false"> <cfargument name="event" required="true" /> <!--- Get the "phrase" value from the form ---> <cfset var phrase = arguments.event.getValue("phrase") />

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Note The full XHTML standard is fairly straightforward, but it s a bit beyond the scope of this book. If you

want to learn all the details, you can surf to www.w3schools.com/xhtml for a concise online tutorial.

String contentType = connection.getHeaderField("Content-type");

<!--- Upper case the phrase ---> <cfset var upperCasedPhrase = uCase(phrase) /> <!--- Validate the form ---> <cfif not len(trim(phrase))> <cfset arguments.event.setValue("ValidationError", "Please enter a phrase.") /> <cfset arguments.event.addResult("validationError") /> </cfif> <!--- Set the upper-cased phrase into the event ---> <cfset arguments.event.setValue("upperCasedPhrase", upperCasedPhrase) /> <!--- Add a line to the debugging trace, showing that is worked ---> <cfset arguments.event.addTraceStatement("User", "Phrase is: " & upperCasedPhrase, "UpperCasePhrase") /> </cffunction> Now we have form validation, and our uppercaser functionality is complete. The simplicity of this example is a clear illustration of how Model-Glue provides an advantageous architecture. First, notice that we could reuse our form and results templates in any other event handler. It would be a cinch to add a form for uppercasing a phrase to any page by just including the frmUpperCaser.cfm template. Second, the mechanism by which the phrase is uppercased is separate from the pages in the application. Any page can ask for a phrase to be uppercased by broadcasting the needUpperCasedPhrase message. The event handler itself has no idea how the phrase is uppercased; it simply trusts that the operation will happen. Through this system of decoupling, applications become more flexible. As change inevitably occurs, the application can respond quickly, with fewer chances for errors.

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