AJAX Applications

AJAX Real-World Applications

By combining everything we have learned, we can build robust, highly interactive web applications.

AJAX is used extensively across the modern internet for various features you interact with daily.

Common AJAX Use Cases

• Live Search: Showing dropdown suggestions as you type in a search bar.
• Infinite Scrolling: Loading new images or posts automatically when you scroll to the bottom of a page.
• Form Submission: Sending contact forms or login details without forcing a page reload.
• Dynamic Data Tables: Sorting or filtering a table of products instantly.

Building an Interactive App

In a professional environment, an AJAX application combines HTML buttons, JavaScript event listeners, and backend APIs.

You request JSON or XML data, parse it, and completely manipulate the DOM elements on the screen.

function loadAppDashboard() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
    const data = JSON.parse(this.responseText);
    // Building a complex application view dynamically
    let html = "<h3>Welcome, " + data.username + "</h3>";
    html += "<p>You have " + data.messages + " unread messages.</p>";
    document.getElementById("dashboard").innerHTML = html;
  }
  xhttp.open("GET", "api/dashboard_data.json");
  xhttp.send();
}