ZK Developer's Guide

Extending the Online
Media Library
In the last chapter, we started the implementation of a CRUD application. We
implemented the application with some basics of ZK application. Now it's time to
extend and optimize the application from the last chapter.
AJAX—Live Data
There are many discussions around AJAX. Everybody understands different things
if we are talking about richness and responsiveness of an application. However,
one thing everybody would agree is that one feature of a user interface should be
to show actual data. In the start page (index.zul) in Chapter 2, we implemented a
listbox, which shows the media instances from the underlying persistent storage.
The listbox component has a header (realized with the listheader component)
and the content. In addition to the attributes of a media class there is one column
(symbolized with the recycling bin image) to delete a media item. If we click on the
image the media is removed, and with Executions.sendRedirect("index.zul")
the page is reloaded. The following code recapitulates the implementation of
this section.
MediaDAO dao = MediaDAOFactory.getDAO();
Collection list = dao.getMedia();