how to implement Ajax in jsp servlet?

10/16/2021
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#AJAX in JSP, #JSP Servlet AJAX Example, #AJAX Call in Java, #XMLHttpRequest in JSP

how to implement  Ajax  in jsp servlet?

How to Implement AJAX in JSP and Servlet?

Asynchronous JavaScript and XML, or Ajax, isn’t a new technology in itself, and it’s not a programming language. The term was coined back in 2005 by Jesse James Garrett.

AJAX (Asynchronous JavaScript and XML) is a technique used to create dynamic and interactive web applications without reloading the entire page. It allows data exchange with the server in the background, enhancing user experience and performance. AJAX is widely used in modern web development for features like live search, auto-suggestions, and real-time updates.

In this tutorial, we will demonstrate how to implement AJAX in JSP and Servlet using a simple example.

Steps to Implement AJAX in JSP

1. Creating index.jsp File

The following JSP file (index.jsp) fetches the multiplication table of a given number dynamically using AJAX.

<%@ page import="java.sql.*" %>
<%
int n = Integer.parseInt(request.getParameter("val"));
for (int i = 1; i <= 10; i++) {
    out.print(i * n + "<br>");
}
%>

2. Calling index.jsp Using AJAX Function

The below JavaScript code demonstrates how to make an AJAX call to index.jsp using XMLHttpRequest.

<script>
var request;
function sendInfo() {
    var v = document.getElementById('numberInput').value;
    var url = "index.jsp?val=" + v;
    
    if (window.XMLHttpRequest) {
        request = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        request = new ActiveXObject("Microsoft.XMLHTTP");
    }

    try {
        request.onreadystatechange = getInfo;
        request.open("GET", url, true);
        request.send();
    } catch (e) {
        alert("Unable to connect to server");
    }
}

function getInfo() {
    if (request.readyState == 4 && request.status == 200) {
        document.getElementById('result').innerHTML = request.responseText;
    }
}
</script>

3. Creating the Input Form

<input id="numberInput" type="text" placeholder="Enter a number" />
<input type="button" value="Show Table" onclick="sendInfo()" />
<div id="result"></div>

Why Use AJAX in JSP and Servlets?

  • Improved Performance: AJAX reduces server load by only updating necessary parts of the webpage.
  • Enhanced User Experience: No page reloads result in smoother interactions.
  • Better Interactivity: Ideal for real-time updates, form validations, and live data retrieval.

Conclusion

This tutorial demonstrated how to use AJAX with JSP to dynamically update a webpage without refreshing it. By implementing AJAX, you can significantly enhance the performance and responsiveness of your Java web applications.

This Solution is provided by Shubham mishra ,If you have any questions or suggestions, feel free to leave a comment below. 

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