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As you ve seen in the previous sections, handling user input in ASP.NET applications involves declaring server-side controls that are rendered to HTML to take input from the end user, and defining various event handlers to handle that input. You can add validators by declaring further server-side controls and connecting them with the controls they re to validate against. Similarly, the ASP.NET controls defined in ASPX markup are paired with their event handlers either by a predefined naming convention or by connecting them via strings in the markup. The earlier examples of loose coupling between the various ASP.NET components easily lead to problems when you need to code more complex web applications. Furthermore, the server-centric view requires that all components be rendered to code on the server side, which then executes to produce HTML with any submission/processing event delegated to the server again, leaving little opportunity to customize interaction on the client side. WebSharper takes a fundamentally different approach and views web applications from a clientbased perspective. WebSharper applications are made up of pagelets, annotated F# code that is automatically translated to JavaScript to run on the client on demand. You can combine pagelets to form larger pagelets; you can develop web pages and even entire web sites in a single pagelet. Pagelets that create DOM nodes can be exposed as ASP.NET server controls and composed into ASPX markup seamlessly. Consider the following simple example: open IntelliFactory.WebSharper open IntelliFactory.WebSharper.Html [<JavaScript>]

int show_plan(Protocol *p, Query_tree::query_node *root, Query_tree::query_node *qn, bool print_on_right) { DBUG_ENTER("show_plan"); /* spacer is used to fill white space in the output */ char *spacer = (char *)my_malloc(80, MYF(MY_ZEROFILL | MY_WME)); char *tblname = (char *)my_malloc(256, MYF(MY_ZEROFILL | MY_WME)); int i = 0; if(qn != 0) { show_plan(p, root, qn->left, print_on_right); show_plan(p, root, qn->right, true); /* Draw incoming arrows */ if(print_on_right) strcpy(spacer, " | else strcpy(spacer, " ");

let HelloWorld = let welcome = P [Text "Welcome"] Div [ welcome Input [Type "Button"; Value "Click me!"] |> OnClick (fun e args -> welcome.Text <- "Hello, world!")

One of the classes (with the same name as your database) generated by SqlMetal represents the entire database. This class inherits from the DataContext class and carries with it all the connection

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/* Write out the name of the database and table */ if((qn->left == NULL) && (qn->right == NULL)) { /* If this is a join, it has 2 children so we need to write the children nodes feeding the join node. Spaces are used to place the tables side-by-side. */ if(qn->node_type == Query_tree::qntJoin) { strcpy(tblname, spacer); strcat(tblname, qn->relations[0]->db); strcat(tblname, "."); strcat(tblname, qn->relations[0]->table_name); if(strlen(tblname) < 15) strcat(tblname, " "); else strcat(tblname, " "); strcat(tblname, qn->relations[1]->db); strcat(tblname, "."); strcat(tblname, qn->relations[1]->table_name); write_printf(p, tblname, ""); write_printf(p, spacer, " | |"); write_printf(p, spacer, " | ----------------------------"); write_printf(p, spacer, " | |"); write_printf(p, spacer, " V V"); }

HelloWorld defines a pagelet that returns a DOM node: a DIV tag with two child nodes. The first child node is a paragraph containing welcome text, and the second is an HTML button with Click me! as its title. The key thing to note here is the use of the [<JavaScript>] attribute, which defines a particular code element to be available in JavaScript and thus on the client side. The button s click event handler is attached using OnClick, a shorthand function for the On Events.Click sequence. Additional HTML combinators are available in the IntelliFactory.WebSharper.Html namespace. Each combinator takes a sequence of DOM nodes or a sequence of attributes. If both are required, you can use the -< combinator, such as Div [Class "your-css-class"] -< [ ]

details that are used when accessing the data contained in the database through the mapped objects. You can supply a connection string when you instantiate this main database object, as the following code snippet shows (to run this, you will need the Northwnd.mdf file in your source directory): #light #I @"c:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5" #r "System.Core.dll" #r "System.Data.Linq.dll" #r "FSharp.Linq.dll" #r "Northwind.dll" open System open System.Data.SqlClient open Nwind let db = let connB = new SqlConnectionStringBuilder() connB.AttachDBFilename <- __YOUR_SOURCE_DIRECTORY__ + @"\Northwnd.mdf" connB.IntegratedSecurity <- true connB.Enlist <- false connB.DataSource <- @".\SQLExpress" new Northwind(connB.ConnectionString)

else { strcpy(tblname, strcat(tblname, strcat(tblname, strcat(tblname, write_printf(p, write_printf(p, write_printf(p, write_printf(p, write_printf(p, }

You can define server-side functionality such as functions to fetch data from server files or databases as easily as you define client-side code. Server-side functions, such as those defined to execute over RPC, can be called from client-code seamlessly; the communication protocol is implemented by the WebSharper runtime as JavaScript code. The following is example skeleton code: module YourWebApplication = open IntelliFactory.WebSharper ... [<Rpc.Callable>] let YourServerFunction (...) = ... [<JavaScript>] let YourClientFunction () = let data = YourServerFunction (...) ...

Using LinqToSql from F#

spacer); qn->relations[0]->db); "."); qn->relations[0]->table_name); tblname, ""); spacer, " |"); spacer, " |"); spacer, " |"); spacer, " V");

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