如何深入学习ww ui tag

webwork自己的quickstart demo不就足够详细了吗？

我觉得足够了，反正我就是看那个demo，外加文档学会的。剩下的就要看实践当中摸索了。

*  tag - a small piece of code executed from within JSP, FreeMarker, or Velocity.

    * template - a bit of code, usually written in FreeMarker, that can be rendered by certain tags (HTML tags)

    * theme - a collection of templates packaged together to provide common functionality

Themes can be selected using several different rules, in this order:

   1. The theme attribute on the specific tag
   2. The theme attribute on a tag's surrounding form tag
   3. The page-scoped attribute named theme
   4. The request-scoped attribute named theme
   5. The session-scoped attribute named theme
   6. The application-scoped attribute named theme
   7. The webwork.ui.theme property in webwork.properties (defaults to xhtml)
A few important concepts come from this order:

    * You can override an entire form's theme by only changing the theme attribute for the forum. This makes it easy to use the ajax theme in just a few select places.
    * You can change the theme for a user's session. This might be useful if users can customize their look and feel.
    * If you want to change the theme for the entire application, adjust your webwork.properties.

Because most of the templates you will need are included in the WebWork jar (the classpath), you may find a few situations where you need to override a particular template to provide behavior that is unique to your application. For example, you might wish to change how select tags render. Rather than creating a brand new template and changing every tag to use that template, you can override the built in select.ftl template by copying the file from in the jar over to a new /template/xhtml/select.ftl directory.
 

wrapping an existing theme

Taking a look at the xhtml theme, we can see that the templates there make extensive use of a wrapping technique. For example, a template might look like:

<#include "/${parameters.templateDir}/xhtml/controlheader.ftl" />
<#include "/${parameters.templateDir}/simple/xxx.ftl" />
<#include "/${parameters.templateDir}/xhtml/controlfooter.ftl" />

This template is simply wrapping the simple theme's existing template with a header and a footer. This is a great way to add additional behavior around the basic HTML elements provided by the simple theme.

extending an existing theme

The theme infrastructure provided by WebWork also allows themes to extend an existing theme. What this means is that a theme may contain a theme.properties with a parent entry that contains the name of the theme that you would like to extend. For example, the ajax theme extends the xhtml theme in this way.

By extending a theme, you are not required to implement every single template that the Tags use. Rather, you only need to implement templates that you wish to override. All other templates will be loaded from the parent template.