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<br /> <asp:LinkButton ID="SayHelloButton" Text="Say Hello ..." runat="server" OnClick="SayHelloButton_Click" /> </form> </body> </html> When designing your class, you need to provide mutable fields with the same name as the controls you want to manipulate. Although the HTML page you created had three controls in it, you provide only two mutable fields, because you don t want to manipulate the third control, a link button. You just want it to call the SayHelloButton_Click function when you click it. You do this by adding the function name to the OnClick attribute of the asp:LinkButton control. When the other two controls are created, a label and a textbox, they will be stored in the mutable fields OutputControl and InputControl, respectively. It is the code contained in the .aspx page, not your class, that is responsible for creating these controls. This is why you explicitly initialize these controls to null in the constructor. Finally, all that remains in SayHelloButton_Click is to take the input from InputControl and place it into OutputControl. #light namespace Strangelights.HttpHandlers open System open System.Web.UI open System.Web.UI.WebControls type HelloUser = class inherit Page val mutable OutputControl : Label val mutable InputControl : TextBox new() = { OutputControl = null InputControl = null } member x.SayHelloButton_Click((sender : obj), (e : EventArgs)) = x.OutputControl.Text <- ("Hello ... " + x.InputControl.Text) end Figure 8-9 shows the resulting web page.
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Figure 8-9. A page created using an ASP .NET form This form doesn t look great, but the nice thing about your application being defined in HTML is that you can quickly use images and Cascading Style Sheets (CSS) to spice up the application. Figure 8-10 shows the results of a little CSS magic.
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Figure 8-10. A web page that takes full advantage of HTML and CSS
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You have taken only a brief look at all the functionality offered by ASP .NET. To give beginners a starting point for investigating this further, Table 8-5 summarizes all the namespaces .NET functionality. available in System.Web.dll that contains the ASP Table 8-5. A Summary of the Namespaces Available in System.Web.dll
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System.Web
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This namespace provides types that are the basis to the HTML rendering process that is ASP.NET; this is where the IHttpHander interface, which I have already discussed in this chapter, lives. This namespace provides types that can be used to send emails from ASP.NET applications. This namespace provides controls that are exact copies of HTML tags. This namespace provides controls that are like HTML tags but are more abstract. For example, the TextBox control is rendered as an input tag if its TextMode property is set to TextBoxMode.SingleLine and as a textarea if it is set to TextBoxMode.MultiLine. This namespace provides adapters that can be used to affect the rendering of other controls to alter their behavior or render different HTML tags for different types of browsers. This namespace provides web parts, controls that support a system where users can add, remove, and dynamically configure them within a page to give a personalized experience.
System.Web.Mail System.Web.HtmlControls System.Web.WebControls
System.Web.WebControls.Adapters
System.Web.WebControls.WebParts
Introducing Windows Presentation Foundation
WPF is a library that offers a completely new programming model for user interfaces. It is aimed at creating desktop applications that have more pizzazz than the ones that are created with WinForms. WPF also comes with a new XML-based language called XAML, which can be used to code the bulk of the layout of the form, leaving F# code free to describe the interesting parts of the application.
I Note Several XAML designers are now available; these allow F# users to design their interface using a
graphical WYSWIG tool and then add the interactivity to it using F#. Mobiform offers a designer called Aurora (http://www.mobiform.com/eng/aurora.html), and Microsoft offers a designer called Expression Blend (http://www.microsoft.com/products/expression/en/expression-blend/default.mspx).
The first example you ll look at is how to create a simple form in XAML and then display it to the user using F#. Listing 8-5 shows the XAML definition of a form with four controls: two labels, a textbox, and a button.
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