Facelets Essentials, the first book on Facelets, introduces you to its importance, architecture, and relationship to JSF and the Apache MyFaces web framework. Templates can be interwoven thanks to the fact that they are compiled during the render phase. Facelets uses the new Unified EL. Looking for beautiful books? Download Facelets Essentials: Guide to JavaServer Faces View Definition Framework FirstPress The name attribute of the ui: Facelets provides templating, so you can reuse your code extensively to simplify the development and maintenance of large-scale applications.
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Element conversion[ edit ] In Facelets, templates tags from a tag library can be entered in two forms: directly as a qualified xml element or indirectly via the jsfc attribute on an arbitrary non-qualified element. In the latter case the Facelet compiler will ignore the actual element and will process the element as-if it was the one given by the jsfc attribute. This is not possible when directly using the qualified tags.
Nevertheless, directly using qualified tags is the most popular way of using Facelets in practice  and is the style most used in books and examples. The file that references such a template is called the template client. Template clients themselves can again be used as a template for other template clients and as such a hierarchy of templates can be created.
Content re-use[ edit ] In addition to templating, Facelets provides support for re-use by letting the user include content that resides in a different file. Besides re-using content at multiple locations, this can be used to break down a large Facelet into smaller parts. Occurrences of that tag will then be replaced with the content of the associated Facelet.
Such a tag has to be declared in a Taglib file where it can be associated with a Facelet as follows: example. By convention the content is then automatically assigned a namespace and a tag name. Via those parameters, objects can be passed into the included content, where they can be used as variables.
Composite components require parameters to be declared in their interface section,  while for custom tags there is no such requirement and values provided for arbitrary attributes are made available as variables with the same name as said attribute.
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