Simple .NET/ASP.NET PDF document editor web control SDK

ow the real fun begins! It s time to put your newfound knowledge of the XMLHttpRequest object to work. By showing some simple examples, we ll demonstrate how the XMLHttpRequest object sends requests to the server and how to process the server response with JavaScript.

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member obj.Current = current member obj.Increment() = if current > finish then failwith "finished!"; current <- current + increment end Logically speaking, this class is equivalent to the following one that defines fields and a constructor explicitly: // The previous code is equivalent to the following: type Counter = class val start: int val increment: int val length : int val finish : int val mutable current : int new(start, increment, length) = { start=start; increment=increment; length=length; finish = start + length; current = start; } member obj.Current = current member obj.Increment() = if obj.current > obj.finish then failwith finished! ; obj.current <- obj.current + obj.increme end However, the F# compiler is free to optimize the fields of the class away where possible. For example, the start value is required only during initialization of the object and thus will not be included as a field of the object. The first definition of Counter is a third the size of the second, so obviously the syntax has some advantages. I use both implicit and explicit constructors in this book because it is necessary in some circumstances to understand the more explicit syntax, for example, when writing classes with multiple constructors.

After building the circuit, you ll need to make sure that it works. While running a program that configures the port as an old RCX type Light Sensor, check that the voltage across C1 is between 9V and 6V. You can add a potentiometer, as in Figure A-4, to input a known voltage.

I have already covered inheritance in a limited way in the section Object Expressions. Inheritance allows you to extend a class that is already defined and to tweak its behavior to add new or replace original functionality. Like most modern object-oriented languages, F# allows single inheritance (from one base class) as well as the implementation of multiple interfaces (see the sections Defining interfaces and Implementing Interfaces later in this chapter). This section will cover the very basics of inheritance, and then the following section, Classes and Their Methods, will show how to implement methods to make full use of inheritance. You specify inheritance with the inherit keyword, which must come directly after the keyword class. Let s kick off by looking at a simple example of inheritance between two F# types. The following example shows an F# class, sub, that derives from a base class, base. The

I Note The examples in this chapter do not use a dynamic server to process the response and provide

Using a voltmeter and a program that reads the Raw sensor value, you can create a plot like Figure A-5. The lower end of the voltage range has a flat region because the LM324 cannot output a value less than about 0.6V.

Windows Vista and come already installed on that operating system. They can also be downloaded from

a real-time response. Instead, the examples use simple text files to mimic the server s response. Doing so removes complexity, allowing you to focus on what s happening in the browser.

http://www.microsoft.com and installed on Windows XP and Windows Server 2003 (http://www. microsoft.com/downloads/details.aspx FamilyId=10CC340B-F857-4A14-83F525634C3BF043&displaylang=en). The protocols that WCF uses are based on a group of specifications that

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extend web services and are sometimes referred to as the WS-* protocols because each protocol is generally given a name prefixed by WS-, such as WS-Security or WS-Reliability. Each of these protocols either has been standardized or is currently being put forward for standardization. To develop with WCF, you need to download the .NET Framework 3 SDK from http://www.microsoft.com/downloads.

Figure 8-8. DOM-Drag allows you to enable the individual components to be dragged to any part of the screen.

Figure A-5. Voltage input versus Raw value plot You could just leave the circuit on the breadboard for as long as you needed it, but it s better to commit it permanently to a PCB. It will be more compact and much more reliable because it keeps parts from accidentally being pulled out of the breadboard.