Apple WebObjects 3.5 Manuel d'utilisateur télécharger pdf (Page 94)

Chapter 6 Creating Reusable Components

Figure 27. A Navigational Control

The HTML code for one page might look like this:

<HTML>

<HEAD>

<TITLE>World Wide Web Wisdom, Inc.</TITLE>

</HEAD>

<BODY>

Please come visit us again!

<TH COLSPAN = 4> World Wide Web Wisdom, Inc.</TH>

</TR>

<TD><A HREF = "http://www.wwww.com/sales.html"> Sales </a></TD>

<TD><A HREF = "http://www.wwww.com/service.html"> Service </a></TD>

<TD><A HREF = "http://www.wwww.com/search.html"> Search </a></TD>

</TR>

</TABLE>

</CENTER>

</BODY>

</HTML>

Thirteen lines of HTML code deﬁne the HTML table that constitutes the

navigational control. You could copy these lines into each of the application’s

pages or use a graphical HTML editor to assemble the table wherever you need

one. But as application size increases, these approaches becomes less practical.

And obviously, when a decision is made to replace the navigational table with an

active image, you must update this code in each page. Duplicating HTML code

across pages is a recipe for irritation and long hours of tedium.

With a reusable component, you could deﬁne the same page like this:

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 217 218

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Apple WebObjects 3.5 Manuel d'utilisateur Page 94