Apple WebObjects 3.5 Bedienungsanleitung PDF herunterladen (Seite 20)

Chapter 1 What Is a WebObjects Application?

The following sections describe the WebObjects application ingredients in

more detail.

Components

To write a WebObjects application, you create components and then connect

them. A

component is a web page, or a portion of one, that has both content and

behavior. Usually a component represents an entire page, so the word “page” is

used interchangeably with the word “component.” However, remember, that

not all components represent an entire page. For example, a component might

represent only a header or footer of a page, and you can nest that component

inside of a component that does represent the entire page.

Each component is located in its own directory, named

Component

.wo

, and

generally contains these parts:

•A template that speciﬁes how the component looks

• Code that speciﬁes how the component acts

• Bindings that associate the component’s template with its code

Figure 1 shows the contents of the

Main.wo

component from the HelloWorld

example. (

Main.wo

is almost always the name of the ﬁrst page of a WebObjects

application.) In this example, the

Main.wo

component contains three ﬁles: a

template in the form of an HTML ﬁle (

Main.html

), the code ﬁle (

Main.wos

), and the

declarations ﬁle (

Main.wod), which contains the bindings between the template

and the code.

Figure 1. The Contents of a WebScript Component Directory

Typically, components contain some form of the three ﬁles shown in Figure 1;

however, any given component might contain more or fewer ﬁles. For example,

components whose code is written in a compiled language do not contain code

Main.html

Main.wo

Main.wod Main.wos

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