Spring MVC 3 ModelAndView: controller method to return several views

Question

my requirement is to return view according to the selected value (select form)

view.jsp:

      <form  method="post" action="/aaa">
                      <select id="attr1" name="attr1">

                            <option value="1">A</option>
                            <option value="2">B</option>

                        </select>
                  <input type="submit" value="submit" />
</form>

if the value selected is A(1) is selected, view1 is the view to display, else view2 is displayed.

Controller method:

@RequestMapping(value = "/aaa", method = RequestMethod.POST)
public ModelAndview methodName ( HttpServletRequest request,
        HttpServletResponse response){

   attribute=request.getParameter("attr1");

   if (attribute==1) return new ModelAndView("view1")
   else if (attribute==2) return new ModelAndView ("view2")

   }

How can I do it? Thanks.

You have tons of syntax errors. Also, one thing is missing: If `1`, then `view1`. If `2`, then `view2`. What if **not** `1` or `2`? What view should it be? — acdcjunior, Jun 12 '13 at 17:41
thnk you for reply, this is just the logic of the method :), I have just 2 views to displaying( view1 if 1 is selected, view2 if 2 is selected) — RaisMEd, Jun 12 '13 at 17:44
Yeah, but your logic says **if attr=1 then view1; else if attr=2 then view2 else viewWHAT?"** — acdcjunior, Jun 12 '13 at 17:46
I got an error when I return 2 ModelAndView, so my logic is wrong — RaisMEd, Jun 12 '13 at 17:47
What if he posts while the selected value is `--select type--`? Then attr will be `NONE`. What view should be returned? `view1`? What's the "default" view? — acdcjunior, Jun 12 '13 at 17:49
Unless you send in the `POST` request what view the user is hitting from, such information (what view was the user in) is not available. — acdcjunior, Jun 12 '13 at 17:53

score 1 · Accepted Answer · answered Jun 12 '13 at 18:00

1

Multiple views are perfectly possible.

Considering the HTML:

<select id="attr1" name="attr1">
    <option value="1">A</option>
    <option value="2">B</option>
</select>

Then the controller method should be:

@RequestMapping(value = "/aaa", method = RequestMethod.POST)
public ModelAndView methodName(@RequestParam(value = "attr1") int attribute) {
    if (attribute == 1) {
        return new ModelAndView("view1");
    }
    else if (attribute == 2) {
        return new ModelAndView("view2");
    }
    else {
        return null; // Empty 200 OK just to be sure if other attr is received
    }
}

answered Jun 12 '13 at 18:00

acdcjunior

132,397
37
331
304

If you must use `HttpServletRequest` and `HttpServletResponse` let me know. The above answer is simpler though. – acdcjunior Jun 12 '13 at 18:06
I use HttpServletRequest to get the parametrs from the view. – RaisMEd Jun 12 '13 at 18:10
Yeah, `@RequestParam(value = "attr1") int attribute` maps automatically the param `attr1` to the variable `attribute`. – acdcjunior Jun 12 '13 at 18:14
it's better, I get the value selected but no view displayed (404). I'm verifying may be I have some errors.. else I will ask!! :) thank you soooooo much. – RaisMEd Jun 12 '13 at 18:29
Make sure the views `view1` and `view2` exist with those names. If there's something else I can do for you, just let me know... – acdcjunior Jun 12 '13 at 18:31
hi, the 2 views works fine when i return just one of them,but not if i do like above – RaisMEd Jun 12 '13 at 18:42
Probleme is that method return always null. else { return null; } – RaisMEd Jun 12 '13 at 18:58
Ok, let me check what may be going on. – acdcjunior Jun 12 '13 at 19:05
Your `action` attribute of the form may be incorrect. Where is your app deployed at? If it is deployed at, for instance, `http://localhost:8080/mySpringApp`, then the form action should be `
` - you have to put the full path there.
– acdcjunior Jun 12 '13 at 19:11
yes, it's correct, probleme is method always return the last condition, when I return another view instead of null, i get it when I submit. – RaisMEd Jun 12 '13 at 19:31
I tried with this ModelAndView mav= new ModelAndView(); if (type==1) { mav=new ModelAndView("view1"); } else if (attr==2) { mav= new ModelAndView("view2"); } return mav; but nothing – RaisMEd Jun 12 '13 at 19:39
What are the types of your `type` and `attr`? If they are strings, you must use `if (type.equals("1")` and `else if (attr.equals("2")`. – acdcjunior Jun 12 '13 at 19:50
YESSS, ;) , they are a strings, really I apreciate your help, thank you so muchh friend. – RaisMEd Jun 12 '13 at 19:59

Spring MVC 3 ModelAndView: controller method to return several views

1 Answers1