CODEWITHSUNDEEP
javaspringcontroller
th3an0maly
th3an0maly

Reputation: 3510

Spring - How to pass a message between Views?

I have an application that displays, edits and deletes Accounts.

  1. Display uses displayAccounts.jsp and is invoked by /accounts url
  2. Edit uses editAccount.jsp and is invoked by /accounts/{id}/edit where id is the Primary Key to the Account to be edited.
  3. Delete does not have a view of it's own, but simply calls the @RequestMapping method in the Controller, and is invoked by /accounts/{id}/delete

Every action, on success, redirects to the Display page.

  1. Once an operation (Edit/Delete) has been successfully performed, I want to send a success message that can be displayed on the Display page. How can I accomplish this?

  2. Since I dont have a view for the Delete operation, I want to display the Errors in the Display page too.

Please help. Thanks in advance.

Upvotes: 2

Views: 7033

Answers (6)

kundan bora
kundan bora

Reputation: 3889

Spring provide ModelMap type object, you can put your data in ModelMap type object.This object is accessible throughout the application. Here you can put a String type variable having value either Success or Failure (based on condition).Later on you can access this model object from jsp page.here is the example.

   @RequestMapping(value="/accounts/{id}/edit ")
 //  public String yourMethod(ModelMap model)
public String yourMethod(HttpServletRequest request,
      HttpServletResponse response,ModelMap model){
   if(someCondition){
     String result = "Success";
    model.addAttribute("result", result);
    }
      else{
          String result="failure";
          model.addAttribute("result", result);
        }
        // return "displayAccounts";
       return new YourControllerClass().yourMethodforAccountDisplay(request, response,model);//this is where you specify account display method with appropriate argument
   }

you can access result from jsp page as below - 

         ${result}

Please enable viewresolver in Spring configuration file.

Upvotes: 1

Japan Trivedi
Japan Trivedi

Reputation: 4483

Use of RedirectAttributes is what you need to achieve this. I assume that from the POST methods of EDIT and DELETE operation you are using "redirect:" to redirect to the DISPLAY view through its controller.

To achieve this you need to have RedirectAttributes attributes as a parameter in the controller function. Then before the return statement you should add following line of code.

attributes.addFlashAttribute("successMsg", "Account Edit/Delete successfully");

or

attributes.addFlashAttribute("errorMsg", "Edit/Delete account is unsuccessful");

in case of error message.

And then on the displayAccounts.jsp page you just need to display the message with ${successMsg} or ${errorMsg}

Once the message will be displayed and if you refresh the page then the message will not come up. It will be displayed to the user just once.

This is perfect for your scenario. Even I use this.

Hope this helps you. Cheers.

Upvotes: 8

Nishant Solanki
Nishant Solanki

Reputation: 66

If you want to pass some message (error/success) to display page from controller than may below code helps,

@Controller
@RequestMapping("/controllerPath")
public class editDeleteController {

    @RequestMapping(method = RequestMethod.GET)
public String methodName(ModelMap model) { 
        model.addAttribute("message", "Message1");
                model.addAttribute("moremessage", "Message2");
        return "viewName";//veiwName here in your case it is displayPage 
    }
}

In display page you will get it by,

<h1>Message : ${message}</h1>

Explain in details if this will not work for you.

Thank you

Okay I think i got your point do some think like this,

@RequestMapping(method = RequestMethod.GET)
    public String editDelete(ModelMap model) {

        if(success)
        {
            model.addAttribute("result", "Success");
            return new ModelAndView("redirect:/displaytagView");//Chaining your controller so it will refresh your Accounts
        }else{
            model.addAttribute("result", "Error");
                        return "displayPage";
        }
    }

Chaining controller to displayPage Controller so it shows refreshed data. Try this hope its work

Upvotes: 1

Rahul Agrawal
Rahul Agrawal

Reputation: 8971

In Controller method in edit and delete method, write a message string into Model as

Edit

model.addAttribute("message", "Record Edited Sucessfully");
model.addAttribute("accountList", accountList);

Delete

model.addAttribute("accountList", accountList);
model.addAttribute("message", "Record Deleted Sucessfully");

and in your displayAccounts.jsp write code to display this message as

<div>
  <span>${message}</span>
</div>

Upvotes: 2

Arun Kumar
Arun Kumar

Reputation: 6794

If your EDIT operation opens different view, then you can pass the message from Controller to the view using following

ModelAndView  mav = new ModelAndView();

and then set the message object as 

mav.addObject("message", "EDIT sucessfully completed");

and in last, set the view name

mav.setViewName("views/afterEditOperation/");

You can use the message directly on your view as ${mesasage}

Upvotes: 2

Arun Kumar
Arun Kumar

Reputation: 6794

You can use AJAX in this case . With this, you can send your action from the same page to Controller for delete operation and get the message from controller on the same page to show sucesss/error message of delete operation from controller.

Upvotes: 1

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