Apple WebObjects 3.5 Bedienungsanleitung PDF herunterladen (Seite 34)

Chapter 2 Dynamic Elements

In the .wod ﬁle, each element is identiﬁed by name and then its type is speciﬁed.

The outermost dynamic element in the HTML ﬁle

(OPTION_REPETITION) deﬁnes a WORepetition, the next element is a

WOHyperlink, and the innermost element is a WOString.

Each type speciﬁcation is followed by a list of attributes. Dynamic elements

deﬁne several attributes that you bind to different values to conﬁgure the

element for your application. Usually, you bind attributes to variables or

methods from your component’s code (see Figure 12).

Figure 12. Dynamic Element Bindings

In the CyberWind example, the Main component binds to two attributes of

WORepetition:

list and item. The list attribute speciﬁes the list that the

WORepetition should iterate over. The

item attribute speciﬁes a variable whose

value will be updated in each iteration of the list (like an index variable in a

for

loop). CyberWind’s Main component binds the

list attribute to an array named

allOptions and the item attribute to a variable named currentOption.

The WOHyperlink has an

action attribute, which is bound to a method called

pickOptions. The action attribute speciﬁes a method that should be invoked when

the user clicks the link. In this case, the

pickOptions method determines which link

the user clicked and then returns the appropriate page.

Record

value

action

TEXTFIELD : WOTextField {

value = aName;

}

Button : WOSubmitButton {

action = recordThis;

}

id aName;

- recordThis{

...

}

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Apple WebObjects 3.5 Bedienungsanleitung Seite 34