Ajax (Asynchronous JavaScript and XML) is a technique used to create dynamic and fast web pages. It allows your web browser to communicate with a web server and request information without having to refresh the entire page. This is achieved by sending an HTTP request (such as a GET request) to the server in the background, while the rest of the page continues to load and function normally. The response from the server is then processed by JavaScript and used to update the page dynamically, providing a more seamless user experience. Ajax is widely used for tasks such as retrieving data from a database, searching for information, or updating parts of a page without reloading the whole page.
Ajax is a technique used for creating fast and dynamic web pages. It allows you to send and receive data from a server asynchronously, without having to refresh the entire page. In this blog post, we will show you how to use an AJAX GET request to retrieve data from a server and display it on your website.
First, let’s define the server endpoint we want to send a request to. For this example, let’s use a free API that returns your IP address.
URL
https://api.ipify.org?format=json
Now, we need to create a JavaScript function that will send an AJAX request to this endpoint. To do this, we’ll use the XMLHttpRequest object.
JS
function getIPAddress() { var xhr = new XMLHttpRequest(); xhr.open("GET", "https://api.ipify.org?format=json", true); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var response = JSON.parse(xhr.responseText); displayIPAddress(response); } }; xhr.send(); }
In the code above, we first create a new XMLHttpRequest object and use the open method to specify the type of request we want to send (GET), the URL of the endpoint, and a boolean value indicating whether the request should be asynchronous.
Next, we define a onreadystatechange function that will be called every time the state of the request changes. We check the readyState property of the request to see if it’s equal to 4, which indicates that the request has completed, and the status property to see if it’s equal to 200, which indicates that the request was successful.
If both of these conditions are true, we parse the response from the server as a JSON object and pass it to the displayIPAddress function.
Finally, we use the send method to actually send the request.
The displayIPAddress function will use the response from the server to dynamically display a list of users on the page.
JS
function displayIPAddress(ipAddress) { document.body.appendChild(ipAddress); }
In the code above, we append the IP address to the body of the page.
To actually use this code, you would need to call the getIPAddress function when the page loads. You can do this by adding the following code to your script:
JS
document.addEventListener("DOMContentLoaded", function() { getIPAddress(); });
That’s it! With just a few lines of code, you can retrieve data from a server.
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