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Page Based Decorator With PageDecoratorMapper

With this modification, individual pages can specify the decorator to use with a meta tag.

First, add to the sitemesh.xml the PageDecoratorMapper,

The order of the mapper elements determine precedence. A well behaved application should use the following order,

  1. Parameter query = ParameterDecoratorMapper
  2. Page specific using meta tag = PageDecoratorMapper
  3. Pattern = ConfigDecoratorMapper

Keep in mind that the nature of the mapper elements can override the order set by the developer.

For example, a common mistake is to put ConfigDecoratorMapper before PageDecoratorMapper. Because ConfigDecoratorMapper is so general, technically all pages request would cause a decorator to be loaded and as such the PageDecoratorMapper never gets loaded. Even in the case of an exclude in decorators.xml, the match is to not apply a decorator and again PageDecoratorMapper is never loaded.

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