AJAX GET Request – Explanation with Example

AJAX GET Request is used to retrieve data from a server without reloading the entire web page. It’s commonly used in web applications to fetch data dynamically and display it to the user.

🔹 What is an AJAX GET Request?

• AJAX: Asynchronous JavaScript and XML.
• GET Method: Sends data appended to the URL as query parameters.
• Used to request data (not modify it).
• Data is sent to the server, and a response is returned asynchronously.

✅ Syntax (Using jQuery)

$.ajax({
  url: 'server-script.php', // URL to send the request
  type: 'GET',              // HTTP method
  data: { id: 123 },        // Parameters sent to the server
  success: function(response) {
    // Handle successful response
    console.log(response);
  },
  error: function(xhr, status, error) {
    // Handle errors
    console.error(error);
  }
});

✅ Real Example

Let's say you want to fetch user data by ID.

🧩 HTML:

<button onclick="getUserData()">Get User Info</button>
<div id="user-info"></div>

⚙️ JavaScript:

function getUserData() {
  $.ajax({
    url: 'get-user.php',
    type: 'GET',
    data: { user_id: 5 },
    success: function(response) {
      $('#user-info').html(response);
    },
    error: function(error) {
      console.log('Error:', error);
    }
  });
}

📄 get-user.php (Server-side):

<?php
if (isset($_GET['user_id'])) {
    $userId = $_GET['user_id'];
    // Dummy data fetch simulation
    echo "User ID: $userId - Name: John Doe";
}
?>

✅ Key Notes:

• type: 'GET': Specifies GET request.
• data: Sends query parameters (user_id=5).
• success: Handles the data returned from the server.
• error: Catches any issues in the request.