How to start a script after that the controller sends data to jsp

Question

I have index.jsp. This jsp calls the controller:

@Controller
public class CustomerController {

    //Other code..
    //..
    String customerJSON = null;
    ModelAndView model = new ModelAndView("index", "customerJSON",  customerJSON);
    return model;
}

customerJSON is a string that contains JSON information.

Controller returns customerJSON to jsp.

Now, in jsp, I want to show customerJSON into an alert.

In jsp I add:

<script>
    var customer = "<c:out value='${customerJSON}'/>";
    alert(customer);
</script>

The problem is that, this alert, starts when the page is loaded and not when the controller returns to jsp.

How can I show the alert after controller call and not when the page is loaded?

Answer 1

I would implement your controller method (and requestmapping) something like this:

@RequestMapping(value = "/getCustomer")
public @ResponseBody Customer getCustomer() {
    Customer c = new Customer();
    //do whatever is needed to init customer data

    return c;
}

If you have jackson as dependency that will take care of json-serializing for you.

Then your javascript (using jquery) code could look something like this:

<script>
$.getJSON("getCustomer", data, function (result)      
{
   alert(result);
});
</script>