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AJAX-enabled forms in Drupal provide the ability to dynamically modify forms as a user interacts with the elements on the form A common example is to update the list of items in a select list based on some value that the user selected or entered in a previous field for example, select an automobile manufacturer from a select list changes the list of available models based on the value selected by the user While you can perform that action without AJAX, its nice to not force the user to sit through a page reload the form populates the values in the second drop down list AJAX provides the means for performing that update without having to reload the whole page, only the part that needs to be changed.

Table 29-3. Geometry Derived Classes Geometry Class LineGeometry RectangleGeometry EllipseGeometry GeometryGroup CombinedGeometry PathGeometry Meaning in Life Represents a straight line. Represents a rectangle. Represents an ellipse. Allows you to group together several Geometry objects. Allows you to merge two different Geometry objects into a single shape. Represents a figure composed of lines and curves.

Here is a Path defined in kaxaml that makes use of a few Geometry-derived types. Notice that we are setting the Data property of Path to a GeometryGroup object that contains other Geometry-derived objects such as EllipseGeometry, RectangleGeometry, and LineGeometry. Figure 29-5 shows the output. <!--A Path contains a set of geometry objects, set with the Data property --> <Path Fill = "Orange" Stroke = "Blue" StrokeThickness = "3"> <Path.Data> <GeometryGroup> <EllipseGeometry Center = "75,70" RadiusX = "30" RadiusY = "30" /> <RectangleGeometry Rect = "25,55 100 30" /> <LineGeometry StartPoint="0,0" EndPoint="70,30" /> <LineGeometry StartPoint="70,30" EndPoint="0,30" /> </GeometryGroup> </Path.Data> </Path>

The benefits of using the Form API s AJAX capbilities include: AJAX forms provide dynamic form behavior without forcing the user to sit through one or more page reloads while the form updates an element You as the developer don't have to code Javascript to create an AJAX-enabled form The Form API does all of the heavy lifting for you AJAX forms are often simpler than multistep forms Create or update an existing form element and mark it as AJAX-enabled by using the #ajax property Form elements marked as AJAX-enabled trigger a background AJAX call when the user change it or clicks on it The #ajax['wrapper'] property includes the HTML ID of a page section that will be modified when the Ajax call is executed The #ajax['callback'] indicates which callback should be executed after the AJAX call happens and the form is rebuilt.

Figure 29-5. A Path containing various Geometries objects The image in Figure 29-5 could have been rendered using the Line, Ellipse, and Rectangle classes shown earlier. However, this would have put various UIElement objects in memory. When you use geometries to model the plot points of what to draw, and then place the geometry collection into a container that can render the data (Path, in this case), you reduce the memory overhead. Now recall that Path has the same inheritance chain as any other member of System.Windows.Shapes, and therefore has the ability to send the same event notifications as other UIElements. Thus, if you were to define this same <Path> element in a Visual Studio 2010 project, you could determine if the user clicked anywhere in the sweeping line simply by handling a mouse event (remember, kaxaml does not allow you to handle events for the markup you have authored).

The Path "Modeling Mini Language"

Second, create a callback function using the name of the callback listed in #ajax['callback'] This function s primary typically updates the content of the HTML ID identified in the #ajax[ wrapper ]..

Of all the classes listed in Table 29-2, PathGeometry is the most complex to configure in terms of XAML or code. This has to do with the fact that each segment of the PathGeometry is composed of objects that contain various segments and figures (for example, ArcSegment, BezierSegment, LineSegment, PolyBezierSegment, PolyLineSegment, PolyQuadraticBezierSegment, etc). Here is an example of a Path object whose Data property has been set to a <PathGeometry> composed of various figures and segments. <Path Stroke="Black" StrokeThickness="1" > <Path.Data> <PathGeometry> <PathGeometry.Figures> <PathFigure StartPoint="10,50"> <PathFigure.Segments> <BezierSegment Point1="100,0" Point2="200,200" Point3="300,100"/> <LineSegment Point="400,100" /> <ArcSegment Size="50,50" RotationAngle="45" IsLargeArc="True" SweepDirection="Clockwise" Point="200,100"/> </PathFigure.Segments> </PathFigure> </PathGeometry.Figures> </PathGeometry> </Path.Data> </Path>