Hi,
In your example, Struts knows about the implementing class for the
form-property bean (ManagerNewsView). Is it necessary and how can we
avoid?
<form-bean name="newsForm"
type="org.apache.struts.validator.DynaValidatorForm">
<form-property name="view"
type="edu.sc.asg.manager.view.ManagerNewsView"/>
</form-bean>
Thanks,
Suresh
>-----Original Message-----
>From: VEDRE, RANAPRATAP REDDY [mailto:[EMAIL PROTECTED]]
>Sent: Wednesday, January 08, 2003 6:43 PM
>To: 'Suresh Addagalla '; '[EMAIL PROTECTED] '
>Subject: RE: Passing data to presentation objects
>
>
>
> This is how i use value objects.
>
> I have a property in my form called view. It is user written
>class and
>contains all the information that needs to be available in the jsp.
>This view object has to be initialized in ur action class
>before forwarding
>to the jsp.
>
>I find this especially useful when there is a lot of information to be
>obtained from a database, to be displayed in a jsp. ActionForm
>contains only
>the fields that the user enters/submits in the html form/page
>and all other
>data is embedded in the view class.
>
>lets say u have have a couple of vectors(Containers) to be
>initialised from
>the database for rendering select boxes.
>
>You can store the vectors int the form, or add each vector
>seperately to the
>request object.
>
>By using a view class which contains two vectors as member variables.
>you have to create an instance of the view class and call the
>set methods to
>initialize the two vectors in the instance and then set the ActionsForm
>"view" attribute with this instance.
>Then in ur jsp,get the view instance from the form and the
>vectors from it
>using <bean:define > tag or something similar.
>
>It is bit more work than adding the vector objects directly
>to the request.
>but it has the advantage in that u can easily see which view
>objects are
>used for an Action or JSP just by looking at the form declarations in
>struts-config.xml(if u are using dynamic forms)
>
>-Rana.
>
>Sample form declaration using a view attribute.
>
>
> <form-bean name="newsForm"
>type="org.apache.struts.validator.DynaValidatorForm">
> <form-property name="newsId" initial=" "
>type="java.lang.String"/>
> <form-property name="title" type="java.lang.String"/>
> <form-property name="body" type="java.lang.String"/>
> <form-property name="view"
>type="edu.sc.asg.manager.view.ManagerNewsView"/>
> <form-property name="action" type="java.lang.String"/>
> </form-bean>
>
>-----Original Message-----
>From: Suresh Addagalla
>To: [EMAIL PROTECTED]
>Sent: 1/8/2003 6:31 AM
>Subject: Passing data to presentation objects
>
>Hi,
>
>I have been reading a lot of material on Struts, but I could not get
>answer to my question.
>
>What is the recommended strategy (or a design pattern) to pass data to
>the view objects (JSPs in my case)?
>
>One reply I got is to use the form-beans associated with the actions to
>pass data to the JSPs. I found some situations when this did not work
>well (for example, I faced this problem when I am trying to
>use the same
>form-bean for populating data as well as editing/submitting a form).
>
>What are "value objects" and how are they useful in passing data? Can
>someone refer me to a good resource on knowing more about this? Any
>examples would be highly useful.
>
>Also, is there any sample application I can download and which can be
>used as sort of a reference for common tasks required for struts
>programming?
>
>Thanks,
>Suresh
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