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Java Forum / General / November 2005DynaActionForm and field checking
when i use Form Bean i use ActionErrors to validate example : public final class HelloForm extends ActionForm { public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { ActionErrors errors = new ActionErrors(); if ((person == null) || (person.length() < 1)) errors.add("person", new ActionError("ch03.hello.no.person.error")); return errors; } But when if i use DynaActionForm how do i validate ? i DONT want to use Struts validation.xml + validation-rules.xml. how do i do field checking if there is DynaActionForm ? > when i use Form Bean i use ActionErrors to validate <snip example> > But when if i use DynaActionForm how do i validate ? > > i DONT want to use Struts validation.xml + validation-rules.xml. > > how do i do field checking if there is DynaActionForm ? you could do validation in your action you mean i could place this code in the Action class ? public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { ActionErrors errors = new ActionErrors(); if ((person == null) || (person.length() < 1)) errors.add("person", new ActionError("ch03.hello.no.person.error")); return errors; } another question : should we use Struts validation.xml ? some people say its good ...some says it is not. what do you think ? is this true Struts also can do Client-side validation ?? !! ...how is that possible ? only javascript (no other language) does client side validation . How much correct it is ? anybody know Struts ? >anybody know Struts ? there must be at least eight.  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. On Wed, 16 Nov 2005 12:47:31 GMT, Roedy Green <my_email_is_posted_on_my_website@munged.invalid> wrote, quoted or indirectly quoted someone who said : >there must be at least eight. that is a punch line to an old joke. "Think of all the people in the world worse off than you are ---" SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > you mean i could place this code in the Action class ? > [quoted text clipped - 9 lines] > return errors; > } yes you could do something like that but you would have to call it from the 'execute' method of your action, or just do it in the execute method, like this: public final ActionForward execute( final ActionMapping mapping, final ActionForm form, final HttpServletRequest request, final HttpServletResponse response) throws Exception { MyFormBeanType myFormBean = (MyFormBeanType)form; // note use of ActionMessages to avoid using the // deprecated 'saveErrors(HttpServletRequest, ActionMessages)' ActionMessages messages = new ActionMessages(); if ((myFormBean.getPerson() == null) || (myFormBean.getPerson().length() < 1)) { messages.add("person", new ActionMessage("ch03.hello.no.person.error")); } //maybe validate some additional fields here if(messages.isEmpty()) { // do normal stuff here return mapping.findForward("success"); } else { this.saveErrors(request, messages); return mapping.findForward("failure"); } } > another question : should we use Struts validation.xml ? some people > say its good ...some says it is not. what do you think ? It's ok if you have forms with many fields that don't require complex validation. I personally don't like it much, one reason being that there isn't adequate syntax checking of the validation.xml file. If you have an error in the xml, in some cases the field being validated will always pass validation, with no other indication that something is wrong. > is this true Struts also can do Client-side validation ?? !! ...how is > that possible ? only javascript (no other language) does client side > validation . How much correct it is ? The Struts validator uses javascript to do client side validation, and client side is optional. I think you could use a good Struts book. Check out "Struts in Action" by Ted Husted great answers. you are definitely a Struts guru. > > you mean i could place this code in the Action class ? > > [quoted text clipped - 60 lines] > I think you could use a good Struts book. Check out "Struts in Action" by > Ted Husted I would think you can use org.apache.struts.validator.DynaValidatorForm Abhijat > when i use Form Bean i use ActionErrors to validate > [quoted text clipped - 19 lines] > > how do i do field checking if there is DynaActionForm ? I think I made is sound simpler than it is (I have not used struts for development). If you do custom processing for your forms, you have to write custom code. This code has to work with DynaActionForm. So here are two approaches I can suggest - * Write a separate subclass of DynaValidatorForm for each validation. I have a feeling you do not want to do this. * Subclass DynaValidatorForm, separate out the validation part (probably use a strategy) and read the name of this Validator class through configuration. You can add a property "ValidatorClass" - pass the name of the concrete validator class through the "form-property" element. The validate method can create the correct Validator class (by reading the property "ValidatorClass") and delegate the work to this object. The documentation for DynaValidatorForm says something about "basic field validation based on an XML file". You might also want to look into that (or wait for the eight people who know struts to post a reply). Abhijat > I would think you can use org.apache.struts.validator.DynaValidatorForm > Abhijat [quoted text clipped - 22 lines] >> >> how do i do field checking if there is DynaActionForm ? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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