Apple WebObjects 5 Uživatelský manuál stáhnout pdf (Strana 39)

CHAPTER 4

HTML-Based Applications

A Programmer’s View of WebObjects 39

 Apple Computer, Inc. January 2002

Figure 4-1 The files of a WebObjects component

Dynamic Elements

The template file in Figure 4-1 looks like any other HTML file except for the element

with the <WEBOBJECT> tag. In this example, this tag represents a dynamic element.

Dynamic elements are the basic building blocks of a WebObjects HTML application.

They link an application’s behavior with the HTML page shown in the Web

browser, and their contents are defined at runtime. A dynamic element appears in

the template as a <WEBOBJECT> tag with a corresponding </WEBOBJECT> closing tag.

<HTML>

<HEAD><TITLE>Greeting</TITLE></HEAD>

<BODY>

Hello <WEBOBJECT NAME=String1></WEBOBJECT>!

</HTML>

import com.webobjects.appserver.*;

public class Greeting extends WOComponent {

protected String userName;

public Greeting(WOContext context) {

super(context);

}

public String userName() {

return userName;

}

public void setUserName(String newUserName) {

userName = newUserName;

}

String1 : WOString {

value = userName;

}

Component (Greeting.wo)

Template (Greeting.html)

Code (Greeting.java)

Bindings (Greeting.wod)

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Apple WebObjects 5 Uživatelský manuál Strana 39