Re: populate data for edit form

[Joe Germuska]

The problem is that you are specifying the "attribute" value for one 
of your action mappings, but not for the other.  For the first (setup 
action), because no "attribute" value is set in the ActionMapping, 
Struts looks in the request for a bean under the form's name 
"categoryEditForm".  If it doesn't find one, it creates one and puts 
it there, so that by the time your Action's execute method is called, 
the ActionForm passed in the signature is also in the request under 
that attribute name.

Then, when the JSP renders, the html:form tag uses its action 
attribute to look up the ActionMapping for the submission 
("/categoryEdit").  This ActionMapping specifies that its form bean 
should be stored under the attribute name "val_categoryEdit".  There 
is nothing in the request under that name, so Struts creates a new 
form, which is not initialized, and uses it for prepopulating form 
field values.

Again, if you do not specify an "attribute" in an <action> element, 
the value defaults to the form's name (as specified in the <action>'s 
"name" attribute).  I have never had a reason to specify "attribute" 
in the <action> element, but if you do, you need it to be consistent 
between the actions that are cooperating.

Hope this helps,
        Joe
At 4:19 PM +0700 1/12/05, Dody Rachmat Wicaksono wrote:
I'm trying to create an edit page. I think I already in the right 
direction, but still unable to populate data even with a direct 
value via action class. Please let me what's wrong here. I've spend 
3 days alone with this problem.
Thank you.

I created two action file:
- SetUpCategoryEditAction.java (this action will populate data from 
db to form)
- CategoryEditAction.java (this action will save the data)

My formbean: CategoryEditForm.java
----------------------
public class CategoryEditForm extends ValidatorForm  {                     
    private String name;
    private String categoryId;    

    public void setName(String s) {
        this.name = s;
    }
    public String getName() {
        return name;
    }             
    public void setcategoryId(String s) {
        this.categoryId = s;
    }
    public String getcategoryId() {
        return categoryId;
    }
}

My struts-config.xml
----------------------
<form-bean name="categoryEditForm" 
type="com.strutsgen.garuda.CategoryEditForm"/>

        <action path="/setUpCategoryEditForm"
            type="com.strutsgen.garuda.SetUpCategoryEditAction"
            name="categoryEditForm"
            scope="request"
            validate="false"
            >
            <forward
                    name="continue"
                    path="/categoryEditForm.jsp"/>
        </action>
        <action path="/categoryEdit"
            type="com.strutsgen.garuda.CategoryEditAction"
            name="categoryEditForm"
            attribute="val_categoryEdit"
            scope="request"
            validate="true"
            input="/categoryEditForm.jsp"
            >
            <forward
                    name="success"
                    path="/categoryEditOk.jsp"/>
        </action>
SetUpCategoryEditAction.java:
----------------------
public final class SetUpCategoryEditAction extends Action {
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
        throws Exception {
        CategoryEditForm categoryEditForm = (CategoryEditForm)form;
        categoryEditForm.setName("testing");
        return (mapping.findForward("continue"));
    }
}

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--
Joe Germuska            
[EMAIL PROTECTED]  
http://blog.germuska.com    
"Narrow minds are weapons made for mass destruction"  -The Ex

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