Apple WebObjects 3.5 Manual de usuario descargar pdf (Pagina 88)

Chapter 3 Creating a WebObjects Database Application

The Movies application speciﬁes default values for newly created Movie

objects using the display group,

movieDisplayGroup.

1. Open

Main.java in Project Builder.

2. Add the following constructor:

public Main() {

super();

MutableHashtable defaultValues = new MutableHashtable();

defaultValues.put("title", "New Movie Title");

movieDisplayGroup.setInsertedObjectDefaultValues(defaultValues);

}

This method assigns the value “New Movie Title” as the default value for

a new movie’s

title attribute. When movieDisplayGroup inserts a new movie (as it

does when a user clicks the Insert button), it creates a new movie and

assigns this default value to that movie.

Setting a Date Format

To change the way that dates are displayed, you assign a date format to the

element that displays the dates.

1. Inspect the

dateReleased text ﬁeld, which is near the bottom of the Main

component window.

Notice that the text ﬁeld has a

dateformat attribute that is bound to the string

“%m/%d/%y”. This binding tells the text ﬁeld that it’s displaying dates

and describes how to format them. The %m conversion speciﬁer stands for

month as a decimal number, %d stands for day of the month, and %y

stands for year without century.

2. Change the

dateformat value to the string (including the quotes) "%d %b %Y".

This date format displays dates such as 3 Sep 1997. The %b conversion

speciﬁer stands for abbreviated month name, and %Y stands for year with

century. You can create your own date formats with any of the conversion

speciﬁers deﬁned for dates. For more information, see the CalendarDate

class speciﬁcation in the Foundation Framework Reference.

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Apple WebObjects 3.5 Manual de usuario Pagina 88