June 2014
Intermediate to advanced
578 pages
12h 2m
English
Content preview from Mastering JavaServer Faces 2.2Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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EL value expressions
Value expressions are probably used the most, and they refer to objects and their properties and attributes. Such expressions are dynamically used to evaluate results or set bean properties at runtime. Through value expressions, you can easily access JavaBeans components, collections, and Java SE enumerated types. Moreover, EL provides a set of implicit objects that can be used to get attributes from different scopes and parameter values. Furthermore, you will see how EL deals with each of these objects.
Note
Value expressions that can read data, but cannot write it are known as rvalue (${} expressions are always rvalue), while those that can read and write data are known as lvalue (#{} expressions can be rvalue and/or lvalue). ...
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