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How to perform AJAX requests via jQuery

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When you need to make an AJAX request shorter in javascript, you have to use jQuery ajax() method. It is simple and multi-functional due to syntax parameters given by jQuery. Also, you can easily implement functions after the request turns success message to access whatever variables you want, embedded in the request.

This is a basic AJAX request to elicit new comments from the database. I choose to show the GET Method but you can, of course, send data packets through the POST method.

var commentNumber = 10;

$.ajax({
url: 'https://www.mywebsite.com/?getNewComment='+commentNumber,
type: 'GET',
async:true,
success: function(result){
$("#commentBar").append(result);
}
});

Code Explanation

First of all, $.ajax( ); method had started an AJAX request throughout the server.

I defined the request values by using ajax method parameters which are well-explained below.

According to which number of comment I want to show, I sent contentNumber via the GET Method.

If the requested page turns a success message, its result - comments - is added under the element named commentBar as child elements via .append( ); method.

Syntax(1)

Name Description
async A Boolean value indicating whether the request should be handled asynchronous or not. Default is true
beforeSend(xhr) A function to run before the request is sent
cache A Boolean value indicating whether the browser should cache the requested pages. Default is true
complete(xhr,status) A function to run when the request is finished (after success and error functions)
contentType The content type used when sending data to the server. Default is: "application/x-www-form-urlencoded"
context Specifies the "this" value for all AJAX related callback functions
data Specifies data to be sent to the server
dataFilter(data,type) A function used to handle the raw response data of the XMLHttpRequest
dataType The data type expected of the server response.
error(xhr,status,error) A function to run if the request fails.
global A Boolean value specifying whether or not to trigger global AJAX event handles for the request. Default is true
ifModified A Boolean value specifying whether a request is only successful if the response has changed since the last request. Default is: false.
jsonp A string overriding the callback function in a jsonp request
jsonpCallback Specifies a name for the callback function in a jsonp request
password Specifies a password to be used in an HTTP access authentication request.
processData A Boolean value specifying whether or not data sent with the request should be transformed into a query string. Default is true
scriptCharset Specifies the charset for the request
success(result,status,xhr) A function to be run when the request succeeds
timeout The local timeout (in milliseconds) for the request
traditional A Boolean value specifying whether or not to use the traditional style of param serialization
type Specifies the type of request. (GET or POST)
url Specifies the URL to send the request to. Default is the current page
username Specifies a username to be used in an HTTP access authentication request
xhr A function used for creating the XMLHttpRequest object

References

(1) https://www.w3schools.com/jquery/ajax_ajax.asp