Ajax stands for Asynchronous JavaScript and XML. It is a popular technique used to create dynamic and responsive web pages. Ajax allows web developers to send and receive data from server-side scripts asynchronously, without the need for a page refresh.
An AJAX request is simply an HTTP request made from a web page to a server-side script, which sends a response back with a JSON, XML, HTML, or plain text response.
One of the most common use cases of AJAX is to submit data to a server without refreshing the page. In this tutorial, we will learn how to make an AJAX post request using JavaScript.
The first step is to create an HTML form with some inputs. Consider we have a simple form with two inputs – name and email.
<form>
<label for="name">Name:</label>
<input type="text" name="name" id="name"/>
<label for="email">Email:</label>
<input type="text" name="email" id="email"/>
<button type="submit" onclick="submitForm()">Submit</button>
</form>
In the above HTML, we have created a form with two input fields – name and email, and a submit button. We have added an onclick event that will call the submitForm function.
The next step is to write the JavaScript code that makes an AJAX post request to the server-side script.
function submitForm() {
const formData = new FormData();
formData.append('name', document.getElementById('name').value);
formData.append('email', document.getElementById('email').value);
const xhr = new XMLHttpRequest();
xhr.open('POST', '/submit-form.php', true);
xhr.onload = function() {
if (xhr.status === 200) {
console.log(xhr.responseText);
} else {
console.log('Request failed. Returned status of ' + xhr.status);
}
};
xhr.send(formData);
}
In the above JavaScript code, we have created a function named submitForm. Inside this function, we have created a new instance of the FormData object and appended the values of the name and email fields to it.
Next, we have created a new instance of the XMLHttpRequest object and opened a new HTTP POST request to the URL /submit-form.php. We have set the third parameter to true to make the request asynchronous.
We have also defined an onload event handler that will be called when the server response is received. If the request was successful (status code 200), we log the response text to the console. If the request was unsuccessful, we log an error message with the status code.
Finally, we send the form data to the server using the send method of the XMLHttpRequest object.
In the server-side script, you can access the submitted data using the POST method. For example, in PHP, you can access the submitted values of the name and email fields using the $_POST global variable.
$name = $_POST['name'];
$email = $_POST['email'];
In conclusion, AJAX post request is a powerful technique for sending data to a server asynchronously without refreshing the page. The above JavaScript code example shows how to use AJAX post request with JavaScript. By using this technique, you can create interactive and dynamic web pages that are responsive and intuitive.
let's dive deeper into the previous topics.
- Ajax:
Asynchronous JavaScript and XML (AJAX) is a technique for creating fast and dynamic web pages. AJAX allows web developers to send and receive data from server-side scripts asynchronously, without the need for a page refresh.
The XMLHttpRequest object is the backbone of AJAX. The object allows web developers to communicate with server-side scripts and retrieve data from them without reloading the entire page. AJAX is essential when creating web applications that require real-time updates without a page refresh.
- Post Requests:
When creating web applications, it's often necessary to send data to the server for processing. POST requests are used to send data to the server using HTTP protocol. POST requests are essential for creating interactive and dynamic web applications.
In a POST request, data is sent in the HTTP message body instead of the URL. POST requests are more secure than GET requests as the data is not visible in the URL. POST requests can handle larger amounts of data, making them ideal for sending files to the server.
- JavaScript:
JavaScript is a programming language used to create interactive and dynamic web pages. JavaScript is essential for creating client-side applications that run in the user's web browser. JavaScript is an object-oriented language with a syntax similar to C++ and Java.
JavaScript can be used to manipulate DOM elements, create animations, and handle user interactions. JavaScript is an essential programming language when creating web applications that require dynamic updates and real-time interactions.
In conclusion, AJAX, POST requests, and JavaScript are essential for creating dynamic and interactive web applications. AJAX allows web developers to retrieve data from server-side scripts without refreshing the entire page. POST requests are used to send data to the server, making them essential for creating interactive web applications. JavaScript is an object-oriented programming language that is used to create interactive and dynamic web pages.
Popular questions
-
What is Ajax post request?
An Ajax post request is a technique used to send data to a server-side script asynchronously without refreshing the entire page. It allows web developers to send and receive data from server-side scripts using HTTP protocol asynchronously. -
How to make an Ajax post request using JavaScript?
To make an Ajax post request using JavaScript, you will need to create an instance of the XMLHttpRequest object and send the request using the send() method. You'll also need to set the request method to POST and provide the URL you want to send the request to. -
What are the advantages of using an Ajax post request?
Using an Ajax post request allows web developers to send data to the server without a page refresh, making the user experience more seamless. It also allows web developers to handle large amounts of data and provides a more responsive and dynamic web application. -
What is the significance of FormData object while making an Ajax post request?
The FormData object is used to collect the data from the HTML form and send it to the server with the Ajax post request. It simplifies the process of passing the form data to the XMLHttpRequest object by allowing you to use append() method to add key-value pairs to the FormData object. -
How does the server-side script handle the data sent via an Ajax post request?
On the server-side, the data sent via an Ajax post request can be accessed through the $_POST superglobal array in PHP, request.body in Node.js, or request.form in Python. The server-side script can then process the data and return a response back to the client.
Tag
"ajax-post"
