what is custom tags with example?

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what is custom tags with example?..

Answer / rakesh

A custom tag is a user-defined JSP language element. When a
JSP page containing a custom tag is translated into a
servlet, the tag is converted to operations on an object
called a tag handler

ex-bodyless tag 2 tags with body
1<tagName attributeName="value"
anotherAttributeName="anotherValue"/>

2.<tagName attributeName="value"
anotherAttributeName="anotherValue">
...tag body...
</tagName>

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what is custom tags with example?..

Answer / rex

JSP technology also provides a mechanism for encapsulating other types of dynamic functionality in custom tags, which are extensions to the JSP language. Custom tags are usually distributed in the form of a tag library, which defines a set of related custom tags and contains the objects that implement the tags.

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what is custom tags with example?..

Answer / ravi

Custom tags are 5 type they are
1. simple custom tag
2. param custom tag
3. iterator custom tag
4. body custom tag
5. nested custom tag

if we want write a simple custom tags, we need to follow
these 5 steps
1. we need write directory taglib and uri to ur jsp page
2. we need call custom tag to ur jsp page
3. we need declare taglib uri and taglib loaction in web.xml
4. we need write taglib Discriptor(TLD) file
5. we need write tag handler class

if u want to write tag handler class, our class must
implements tag interface, it available in
javax.servlet.jsp.tagext.Tag package

Tag is an Interface it contains 6 abstract methods and 4
constant variables i.e,

Abstract methods Constants
PageContext EVAL_BODY_INCLUDE
setParent SKIP_BODY
getParent EVAL_PAGE
doStartTag SKIP_PAGE
doEndTag
relase

it contain some more explanation is there....!

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