ASP.NET Web PDF Document Viewer/Editor Control Library

You may notice that the title says Level 3 what were Levels 1 and 2 all about Level 1 was finished in October 1998 and gave us HTML 40 and XML 10 Today, Level 1 is widely supported In November 2000, Level 2 was completed, though its adoption has been slow CSS was part of Level 2 What will developers gain from the Load and Save specification Ideally, it will solve many of the cross-browser issues we currently encounter Though Ajax is pretty straightforward, you ll recall that just to create an instance of the XMLHttpRequest object you need to check the browser type A true W3C specification would alleviate those types of coding hacks Basically,.

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The sensor can be left on the solderless breadboard and mounted, as shown in Figure 13-45, to make the finished Color Sensor. You might notice that this breadboard layout is different from the one you just developed, but it works exactly the same way.

Using classes from non-F# libraries is also straightforward The syntax for instantiating an object consists of the keyword new, then the name of the class to be instantiated, and then constructor arguments separated by commas within parentheses You can use the let keyword to bind an instance of a class to an identifier Once associated with an identifier, the object behaves a lot like a record type; the object referred to cannot be changed, but its contents can Also, if the identifier is not at the top level, then it can be redefined or hidden by an identifier of the same name in another scope Accessing fields, properties, events, and methods should be pretty intuitive to both C# and Visual Basic programmers because the syntax is similar To access any member, you use the identifier of the object followed by a period (.

) and then the name of the member Arguments to instance methods follow the same convention as for static methods, and they must be within parentheses and separated by commas To retrieve the value of a property or field, only the name of member is needed, and to set it, you use the left arrow (<-) The next example demonstrates how to create a SystemIOFileInfo object and then use various members of the class to manipulate it in different ways On the first line, you make the SystemIO namespace available to F#; then on the second, you create the FileInfo object, passing it the name of the file in which you re interested Then you check whether the file exists using the Exists instance property.

You can program the Color Sensor and a robot arm to sort blocks into separate bins. The blocks in Figure 13-46 are actually made from four 2-by-8 stud bricks. The arm first moves the block over to the Color Sensor and then drops it into the correct bin after the color has been determined.

can selectively suspend execution of a script and inspect the various objects and variables to ensure that the values are as you expect them to be. Since you re already using TDD techniques (you are, aren t you ), you ll know what the expected output of your script should be. If your tests are failing, you can step through the script using Venkman, and by using breakpoints in conjunction with the Local Variables window, you should be able to quickly diagnose the source of any errors. Not only is the Local Variables window a powerful debugging tool, but it s also a great learning tool. With it you can inspect the properties of any object or variable that s available to the JavaScript interpreter. Consider the XMLHttpRequest object, which is well documented. You know it has publicly accessible properties such as responseText, responseXML, and status. But what if you didn t know that Is there a way to find out Figure 7-25 shows two views of an XMLHttpRequest object. The one on the left shows the object right after it has been created and none of its properties has been set. The one on the right shows the object s properties after a successful request has been made.

If it doesn t exist, you create a new file using the CreateText() instance method and then set it to be read-only using the Attributes instance property The next example uses the using function to clean up resources I explain this fully in the section MicrosoftFSharpCoreOperators in 7 #light open SystemIO let file = new FileInfo("testtxt") if not fileExists then using (fileCreateText()) (fun stream -> streamWriteLine("hello world")) fileAttributes <- FileAttributesReadOnly print_endline fileFullName F# also lets you to set properties when you re constructing the object It s quite common to set object properties as part of the process of initially configuring the object, especially in WinForms programming (see 8 for more information about WinForms).