Narayana S wrote:
Hi,
as per my understanding, we can implement validations in struts 2 in the
following ways...
1. overriding validate() method in Action class
Use the validate() method for complex validation that cannot be
implement anywhere else. You want to avoid duplicating validation code
so this method should be for special cases.
2. writing ActionClass-validation.xml file
The XML validation was developed first before Java 5 annotations can be
assumed. It is a little more mature than annotations but some people
doesn't like having to manage more configuration files.
3. using validator annotations
The annotations implement much of what is available in XML and avoid the
separate configuration. There are some complications when using
annotations but generally they're fine. Sometimes I've found the
validation annotations are longer than the actual code, which is a bad
thing. I prefer XML, many people prefer annotations.
and how can i implement client side validations in struts 2?
The struts 2 form tags have client-side validation built-in if you set
validate=true on the form.
What actually happens is that a loop in the form's closing-tag template
reads the validations from the xml/annotations of your action and
generates some javascript implementing whatever validation logic it can
from the client-side. The benefit is that one validation declaration
can be used for both client and server-side. However it can't implement
all validation logic, it assumes you're using struts2 tags and markup
for all fields and it generates inline javascript.
See:
http://struts.apache.org/2.0.11.1/docs/client-side-validation.html
regards,
Jeromy Evans
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