Apple WebObjects 3.5 Manual de usuario descargar pdf (Pagina 112)

Chapter 3 Creating a WebObjects Database Application

112

Managing a DisplayGroup’s Selection

Remember how clicking a movie title in the Main page selects the

corresponding Movie object in

movieDisplayGroup. MovieDetails has a similar

behavior for selecting a MovieRole object in

movieRoleDisplayGroup.

First you need to add a hyperlink element around the repetition’s role name

string so that users can select a particular MovieRole. When a user clicks one of

the movie role hyperlinks, the application should select the corresponding

MovieRole object in the

movieRoleDisplayGroup.

1. Select the repetition’s role name string element.

2. Click the Add WOHyperlink button in the Other WebObjects toolbar to

add a hyperlink element around the string.

Now you need to create an action method to invoke when the hyperlink is

clicked.

3. Use the Add Action command in the pull-down menu to add an action

named

selectObject, returning null.

Before you write the body of the

selectObject method, bind it to the hyperlink

while you’re still in WebObjects Builder.

4. Bind the

selectObject method to the hyperlink’s action attribute.

Now write the code for

selectObject in MovieDetail.java.

5. Modify the

selectObject action to look like the following:

public Component selectObject()

{

movieRoleDisplayGroup.selectObject(movieRole);

return null;

}

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Apple WebObjects 3.5 Manual de usuario Pagina 112