form validation flow

[Yi Zou]

A newbie's question:
When using ActionForm to validate data, if there is no error generated, the controller pass the ActionForm obj to Action to further process the request.
My question is what if there is error, where does controller forward the request to?

[Jeanne Boyarsky]

Yi,
The controller forwards you to the action/jsp specified in the "input" attribute of the action.

For the future, Struts questions are best asked in our Web Applications Frameworks forum down below.

[Mark Spritzler]

I am moving this thread to the more appropriate Web Application Frameworks.

Mark

[somkiat puisungnoen]

Originally posted by Yi Zou:
A newbie's question:
When using ActionForm to validate data, if there is no error generated, the controller pass the ActionForm obj to Action to further process the request.
My question is what if there is error, where does controller forward the request to?

if you use validate() method in ActionForm like this

 public ActionErrors validate(ActionMapping arg0, HttpServletRequest arg1) {
// TODO Auto-generated method stub
ActionErrors errors = new ActionErrors();
if(username == null || username.length() == 0) {
errors.add("username",new ActionError("error.no.username"));
}
if(password == null || password.length() == 0) {
errors.add("password", new ActionError("error.no.password"));
}
return errors;
} 

When have some error in this method , you MUST config page/url for next page in application like this

<action-mappings>
    <action
    path="/login"
    type="com.action.LoginAction"
    name="login"
    input="/jsp/LoginView.jsp"
    validate="true">
 
    <forward name="valid" path="/jsp/LoginMenu.jsp" />
    <forward name="invalid" path="/jsp/LoginView.jsp" />
    <forward name="test" path="/test1" />
</action>  

Finally you should be created mehod for check error in Action Class like this

error = getError(); ...
....
if(errors == null || errors.size() == 0 ) {
return mapping.findForward("valid");
} else {
return mapping.findForward("invalid");
}  

Thai will help you.