Re: How do we repopulate controls when validation fails?

[Alex Rodriguez Lopez]

Don't know if this solves your problem, but maybe it helps to use the 
params-prepare-params trick, calling params interceptor twice, so you 
have your params ready before prepare().

You have an already configured stack, the paramsPrepareParamsStack
From struts-default.xml:

<!-- An example of the paramsPrepareParams trick. This stack
                 is exactly the same as the defaultStack, except that it
                 includes one extra interceptor before the prepare 
interceptor:
                 the params interceptor.

                 This is useful for when you wish to apply parameters 
directly
                 to an object that you wish to load externally (such as 
a DAO
                 or database or service layer), but can't load that object
                 until at least the ID parameter has been loaded. By 
loading
                 the parameters twice, you can retrieve the object in the
                 prepare() method, allowing the second params 
interceptor to
                 apply the values on the object. -->
            <interceptor-stack name="paramsPrepareParamsStack">
                <interceptor-ref name="exception"/>
                <interceptor-ref name="alias"/>
                <interceptor-ref name="i18n"/>
                <interceptor-ref name="checkbox"/>
                <interceptor-ref name="multiselect"/>
                <interceptor-ref name="params">
                    <param 
name="excludeParams">dojo\..*,^struts\..*</param>
                </interceptor-ref>
                <interceptor-ref name="servletConfig"/>
                <interceptor-ref name="prepare"/>
                <interceptor-ref name="chain"/>
                <interceptor-ref name="modelDriven"/>
                <interceptor-ref name="fileUpload"/>
                <interceptor-ref name="staticParams"/>
                <interceptor-ref name="actionMappingParams"/>
                <interceptor-ref name="params">
                    <param 
name="excludeParams">dojo\..*,^struts\..*</param>
                </interceptor-ref>
                <interceptor-ref name="conversionError"/>
                <interceptor-ref name="validation">
                    <param 
name="excludeMethods">input,back,cancel,browse</param>
                </interceptor-ref>
                <interceptor-ref name="workflow">
                    <param 
name="excludeMethods">input,back,cancel,browse</param>
                </interceptor-ref>
            </interceptor-stack>


Hi,

I have read the documentation "How do we repopulate controls when validation
fails" [1]. I tried the action tag solution. However, when there is a
validation error, the execute method of the action in<s:action>  is not
called.

I don't choose the Preparable solution because the parameter required is not
ready in the Prepare stage. (For the first time of visit, the parameter is
set to default.) And I don't want to call the preparation twice in both
execute and prepare. So what is the best way to repopulate controls for
normal case and revisit after validation error? Should I abandon to validate
the input in validate method?

Thanks.
Franz

[1]
http://struts.apache.org/2.x/docs/how-do-we-repopulate-controls-when-validation-fails.html


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