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Posted to user@struts.apache.org by Narayana S <na...@gmail.com> on 2008/06/30 09:33:07 UTC
Validation doubt
Hi,
as per my understanding, we can implement validations in struts 2 in the
following ways...
1. overriding validate() method in Action class
2. writing ActionClass-validation.xml file
3. using validator annotations
validate method implements declarative security, ActionClass-valication.xml
is seperating validation logic from action class .
what is the clear difference between these 3 approaches?
and how can i implement client side validations in struts 2?
Re: Validation doubt
Posted by Lukasz Lenart <lu...@googlemail.com>.
Hi,
> what is the clear difference between these 3 approaches?
Annotations and XML allow you to only use defined validators, with
validate() method you can do anything you want, base your validation
on more complicated business rules.
> and how can i implement client side validations in struts 2?
Client side validation will base on validation rules defined with
Annotations and XML files, just add validate="true" to your form [1]
[1] http://struts.apache.org/2.1.2/docs/client-side-validation.html
Regards
--
Lukasz
http://www.lenart.org.pl/
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Re: Validation doubt
Posted by Narayana S <na...@gmail.com>.
Hi Jeromy and Lukasz,
Thanks for your reply, the information provided by you is
really helpful. i could understand well about validation framework with your
explanation.
Thanks a lot.
On Mon, Jun 30, 2008 at 1:45 PM, Jeromy Evans <
jeromy.evans@blueskyminds.com.au> wrote:
> 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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> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
Re: Validation doubt
Posted by Jeromy Evans <je...@blueskyminds.com.au>.
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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