JScript .NET, Part X: Displaying Information
You probably know well the
alert() method is great for debugging scripts the good old-fashioned way--tracing variables by displaying their values along the flow. JScript .NET provides similar capabilities via the
System.Window.Forms.MessageBox.Show() method. You pass this method a single argument, a string, and it pops up a window displaying this string and an
The message box is called modal. A window or a form is modal if it retains the focus until you explicitly close it. It's a common practice to make dialog boxes and messages modal, since you want to make sure the user reads the message before he or she continues working with the application.
show() method belongs to the class
MessageBox, of the
System.Windows.Forms namespace. Import this namespace before you work with the
MessageBox class, so you don't have to specify the fully-qualified name. As
System.Console are available only from JScript .NET code that is compiled and run from the command line, so is the
System.Windows.Forms namespace. It is not available from ASP.NET pages or from Code Behind JScript .NET code.
The following code greets the user and asks him or her to press the
OK button on two consecutive message boxes:
import System.Windows.Forms; System.Windows.Forms.MessageBox.Show ("Hello! Press the OK button"); MessageBox.Show("Doing fine! Now press the button again.");
The following command-line window shows the code listing, the compilation command of this code (
col116ex4.js), the execution command, and the first message box that pops up. The second command-line window below shows the second message box that pops up after the user clicks the
OK button on the first message box.
Next: How to use