Updating contents of a jsp page without refreshing

Question

I have a jsp page which shows the contents of a table. While the user views a page the contents of the table changes on a second-by-second basis. So the user has to refresh

Answer 1

You should look into using Ajax (jQuery is my preferred method).

http://api.jquery.com/jQuery.get/

http://api.jquery.com/jQuery.post/

This would then hit a controller that would return the data you want without refreshing the page.

So for instance, if you had a login.jsp...

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="true" %>



    



    Hello please login to this application  


Username : 
Password : 


    

In your controller, you would then hit the Model, but for simplicity, I've done a very simple example...

/**
 * Handles requests for the application home page.
 */
@Controller
public class LoginController {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    Util util;

    /**
     * Simply selects the home view to render by returning its name.
     */
    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public String home(Locale locale, Model model, String username, String password) {


        if(username.equalsIgnoreCase("david"))
        {
            model.addAttribute("validUser", "Welcome " + username );

            return "home";
        }
        else
        {
            model.addAttribute("validUser", "Incorrect username and password");
            return "home";
        }

    }

}

This would then add a slow scrolling bit of html to the div to say if it's valid, the code for home is below...

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="true" %>


  ${validUser}.