On my jsp page, I am displaying the contents of a constantly changing table. This means that users have to refresh the page every time they want to see updated information. Is there a way for me to update the content dynamically without requiring users to manually refresh the page? I would like to have a feature similar to Gmail, where the mailbox size increases in real-time without any user intervention.
If you're looking to enhance user experience on your website, Ajax is a great option (I personally prefer using jQuery).
Check out the documentation for making Ajax requests with jQuery:
http://api.jquery.com/jQuery.get/
http://api.jquery.com/jQuery.post/
By implementing Ajax calls in your code, you can access data from a server without refreshing the entire page.
For example, if you have a login.jsp page...
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="true" %>
<html>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<head>
<title>Login</title>
</head>
<body>
<h1>
Welcome, please log in to proceed
</h1>
<script>
function login(){
var username = $("#username").val();
var password = $("#password").val();
$.post('login', { username : username , password : password }, function(data) {
$('#results').html(data).hide().slideDown('slow');
} );
}
</script>
Username : <input id="username" type="text" />
Password : <input id="password" type="password" />
<input name="send" type="submit" value="Click me" onclick="login()" />
<form name="next" action="auth/details" method="get">
<input name="send" type="submit" value="Go Through"/>
</form>
<div id="results" />
</body>
</html>
In your controller, you would then interact with the Model, as demonstrated below with a 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 approach will dynamically update the div with relevant information based on the response received from the server. Here's an example of how the 'home' code could look like...
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="true" %>
<html>
<body>
<P> ${validUser}. </P>
</body>
</html>
One method to retrieve data from the server is by making an ajax request and then utilizing JavaScript to display that data on the screen.
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