.NET/ASP.NET/C#/VB.NET PDF Document SDK

In the simplest case, you can place a module in a namespace simply by using a module name with dots in it. The module and namespace names will be the same. You can also explicitly define a namespace for a module with the namespace directive. For example, you could replace the following: module Strangelights.Foundations.ModuleDemo with this to get the same result: namespace Strangelights.Foundations module ModuleDemo This might not be too useful for modules, but as noted in the previous section, submodules names cannot contain dots, so you use the namespace directive to place submodules within a namespace. For example: #light namespace Strangelights.Foundations module FirstModule = let n = 1 module SecondModule = let n = 2 module ThirdModule = let n = 3 This means that once compiled to the outside world, the first instance of n will be accessible using the identifier Strangelights.Foundation.FirstModule.n instead of just FirstModule.n. It s possible to define a namespace without also using a module directive, but then the source file can contain only type definitions. For example: #light namespace Strangelights.Foundations type MyRecord = { field : string } The following example will not compile, because you can t place a value definition directly into a namespace without explicitly defining a module or submodule within the namespace. #light namespace Strangelights.Foundations let value = "val" In fact, the namespace directive has some interesting and subtle effects on what your code looks like to other languages; I cover this in Calling F# Libraries from C# in 13.

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url}" class="autocomplete" target="_blank"> ${resulttitle} </a> </div> </c:forEach> </tac:replaceChildren> </tac:taconiteRoot> The code in Listings 8-13 and 8-14 performs the same task Each variant builds the results that appear in the results drop-down list (The JavaScript in Listing 8-13 places each result in a table row, and the JSP in Listing 8-14 places each result in a div element) Not only is the JSP/Taconite method slightly shorter (18 lines versus 23 lines), but you ll surely agree that the code in Listing 8-14 looks much more natural and easier to write You ll appreciate writing HTML markup using HTML markup rather than creating it programmatically through JavaScript Better yet, remember those pesky workarounds for the onmouseover, onmouseout, and onclick event handlers In searchAutocompletejsp, the event handlers are written as simple attributes on the HTML elements.

As you have seen in the previous two sections, to specify a value or type that is not defined in the current module, you must use its qualified name. This can quickly become tedious because some qualified names can be quite long. Fortunately, F# provides the open directive so you can use simple names for types and values. The open keyword is followed by the name of the namespace or module you want to open. For example, you could replace the following: #light System.Console.WriteLine("Hello world") with this: #light open System Console.WriteLine("Hello world") Note that you don t need to specify the whole namespace name. You can specify the front part of it and use the remaining parts to qualify simple names. For example, you can specify System.Collections rather than the namespace, System.Collections.Generic, and then use Generic.List to create an instance of the generic List class, as follows: #light open System.Collections let l = new Generic.Dictionary<string, int>()

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Taconite automatically generates cross-browser JavaScript to create these event handlers, freeing you from the responsibility of remembering what the various workarounds are The search component contains a number of enhancements over the autocomplete example from 4 The 4 autocomplete example performed an Ajax request every time the user typed a character into the text box People who type fast create a higher frequency of Ajax requests, increasing the load on the server with little benefit for the user, since rapid typing leaves little time between keystrokes to display the updated results..

You can open F# modules, but you cannot open classes from non-F# libraries. If you open a module, it means you can reference values and types within it by just their simple names. For example, the following finds the length of an array and binds this to the identifier len: #light open Microsoft.FSharp.MLLib.Array let len = length [| 1 |] Some argue that this ability to open modules directly should be used sparingly because it can make it difficult to find where identifiers originated. In fact, modules can typically be divided into two categories: those that are designed to be accessed using qualified names and those that are designed to be opened directly. Most modules are designed to be accessed with qualified names; a few, such as Microsoft.FSharp.Core.Operators, are designed to be directly opened. The next example shows the using function from Operators being used directly:

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