JSP Tutorials - Herong's Tutorial Examples - Version 4.03, by Dr. Herong Yang
Tag Attributes Are Tag Object Properties
This section describes custom tag attributes, which are defined as tag object properties with setter methods.
The JSP tag extension facility maps each attribute encountered in a custom tag to a property of the same name in the tag object. So if you want to use an attribute in a custom tag, you must define a property in the tag class with the same name as the attribute. Here are the steps you need to follow to add an attribute to a custom tag:
1. Define a property in the tag class with the same name as the attribute name by adding a setter method and a getter method. This is the same way as defining a property in a JavaBean class.
2. Add an "attribute" element inside the "tag" element in your TLD file with the following syntax:
<tag> <name>tag_name</name> <tag-class>class_full_name</tag-class> <body-content>empty | jsp</body-content> <attribute> <name>attribute_name</name> <required>true | false</required> </attribute> </tag>
3. Add the attribute to the custom tag in your JSP page. Then the tag is processed, the setter method of the tag object will be called to pass the attribute value into the tag object.
Last update: 2012.
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