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Nearly all web pages need to take user input in one way or another. For example, the user may click buttons or links, or enter values in a web form. Furthermore, web forms typically impose various limitations for the values entered: many fields are required and must be supplied a value, date fields can only be set using date values, fields that expect numeric values reject alpha and special characters, and so on. WebSharper formlets provide an elegant, type-safe, robust way to build web forms and represent the structural make-up, the validations involved, and the layout and other presentation details as a single F# value. They re composable building blocks that can be enhanced and customized to an arbitrary complexity. The IntelliFactory.WebSharper.Formlet namespace contains various formlet controls and enhancements that you can apply, along with important formlet combinators such as Formlet.Run, which renders a formlet into a DOM node. A simple example is a text-box formlet that takes a string input from the user:

So far you have seen how you can perform LINQ-style queries using a set of aggregate operators that work on enumerable objects, and you will see these very same operators query and manipulate XML data in the coming section. Performing querying and manipulation on relational data is done almost the same way, except that these are implemented under the hood by calling LINQ. Assuming that you have mapped your employees database with SqlMetal and created the main database object as db, here is an example similar to those in earlier sections using F# LinqToSql syntax: open Microsoft.FSharp.Quotations.Typed open Microsoft.FSharp.Data.Linq open Microsoft.FSharp.Linq.SequenceOps let res = SQL <@ { for emp in ( db.Employees) when emp.BirthDate.Value.Year > 1960 && emp.LastName.StartsWith "S" -> (emp.FirstName, emp.LastName) } |> take 5 @> for (first, last) in res do printfn "%s %s" first last

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} else if((qn->left != 0) && (qn->right != 0)) { write_printf(p, spacer, " | |"); write_printf(p, spacer, " | ----------------------------"); write_printf(p, spacer, " | |"); write_printf(p, spacer, " V V"); } else if((qn->left != 0) && (qn->right == 0)) { write_printf(p, spacer, " |"); write_printf(p, spacer, " |"); write_printf(p, spacer, " |"); write_printf(p, spacer, " V"); } else if(qn->right != 0) { } write_printf(p, spacer, "-------------------"); /* Write out the node type */ switch(qn->node_type) { case Query_tree::qntProject: { write_printf(p, spacer, "| PROJECT |"); write_printf(p, spacer, "-------------------"); break; } case Query_tree::qntRestrict: { write_printf(p, spacer, "| RESTRICT |"); write_printf(p, spacer, "-------------------"); break; }

let snippet1 = Controls.Input "initial value" You can test this and other formlets quickly by writing a short wrapper function that takes a render function that translates values to DOM nodes and a formlet that supplies those values: [<JavaScript>] let RunInBlock f formlet = let output = Div [] formlet |> Formlet.Run (fun res -> let (elem: Element) = f res output -< [ elem ] |> ignore) |> fun form -> Div [ form output ] Another helper function takes simple string formlets and echoes what has been accepted by those formlets: [<JavaScript>] let RunSnippet formlet = formlet |> RunInBlock (fun name -> Div [ P ["Hi " + name + "!" |> Text] ]) RunSnippet returns a DOM node so you can wrap it in an ASP.NET server control: [<JavaScriptType>] type Snippet1() = inherit Web.Control() [<JavaScript>] override this.Body = snippet1 |> RunSnippet Adding this ASP.NET server control to an ASPX markup displays a text box to write text into and an empty echo message. Each time you press a key, an event is triggered, and the formlet enters an accepting state; subsequently it displays a new echo message that is appended to the previous ones. To remove the initial empty echo message, you can add a validator that doesn t accept values with fewer than three characters by enhancing the plain input formlet: [<JavaScript>] let Snippet1a = Formlet.Yield (fun name -> name) <*> (Controls.Input "" |> Validator.Is (fun s -> s.Length > 3) "Enter a valid name") This is a slightly more elaborate version of the input formlet, enhanced with a particular validator and wrapped in a Formlet.Yield combinator. This function defines how the values collected in the formlet are returned from the formlet and comes in handy for larger formlets that carry multiple fields.

One notable difference between this and previous queries is the use of F# quotations inside <@ and @>. As shown in 9, quotations are reified syntax trees that can be read and manipulated by F# programs. Quoted expressions (provided by the Microsoft.FSharp.Quotations.Typed namespace) are of type Expr<'a>, where 'a is the type of the unquoted expression. You can read more on meta-programming via F# quotations in depth in 9. Note that in F# quotation literals, the splice symbol indicates that a value is being inserted into the quotation expression tree. This allows quotations to reference defined objects and values such as those representing the database. The type of the previous SQL function is as follows:

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