Iterator Tags Examples

Simple  

Range   

Another simple example. Similar to the previous one, except that in this case there is no collection to iterate over. The items attribute is optional in the <forEach> tag. When it is not specified, the range attributes must be used to iterate a specific number of times over the tag's body. In this example, we simply iterate over the integer values specified by the range attributes.

Data Types   

The <forEach> tag supports a large number of data types for the collection of objects to iterate over. In this example, we feature the following data types: array of primitives, array of objects, Enumeration, Properties (Map), String (Comma Separated Values).

Iteration Status   

The iterator tag exposes a wealth of information relative to the iteration taking place. This example features some of that status information.

Collaboration   

The iterator tags expose interface IteratorTag to allow custom tags to establish implicit collaboration. This example shows two custom tags, <even> and <odd> who take advantage of this implicit collaboration.

<forTokens>   

The <forEach> tag provides the basic iteration capabilities. <forTokens> is a specialization for the handling of Strings of tokens. Essentially the same as <forEach>, except that it only applies to Strings of tokens and that it has an extra attribute "delims" to specify the token delimiter.

Extensibility   (ToBeDone)

JSTL exposes in its API the abstract class IteratorTagSupport to facilitate the implementation of custom iterator tags that leverage the standard iteration behavior defined in JSTL. This example shows a custom iterator tag that ...