Tips for utilizing XMLHttpRequest to instruct a website to take action

Although I have no prior experience with Ajax, I am in need of some guidance to create a simple Chrome extension. Despite searching online, I have not been able to find much information on this topic, which I believe should be straightforward.

Request URL:

Request Method: POST

Request Payload:

{amount: 1, user_id: 12345678}

When calling the URL automatically from the website's network panel, certain adjustments need to be made manually, such as changing the token and url values to real data.

In my plan to mix AJAX and JS to call this URL, I intend to use variables for both the TOKEN_VALUE and user_id/amount parameters. However, I lack the know-how on how to execute this call and set the request payload correctly for the site to function as desired.

Your assistance would be greatly appreciated. Here is the code snippet that I have tried so far but did not work:

var request=new XMLHttpRequest;
request.open("POST","https://URL_OF_THE_WEBSITE/v1/send?token=TOKEN_VALUE"),request.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8"),request.Payload("user_id=12345678&amount=5");

I attempted to replicate an example I found online, but it proved unsuccessful. Therefore, I kindly ask for someone to explain how this process works and guide me on adjusting the necessary arguments. Thank you.

Answer №1

function callAjax() {
    // XMLHttpRequest is a powerful object that allows for asynchronous communication with the server
    var request = new XMLHttpRequest(),
        url = 'place_the_url_here_only',
        data = 'amount=1&user_id=12345678&whatever=dataYouWantToSendToServerFromBrowser',
        token = document.querySelector('meta[name="csrf-token"]').content;

    // Handle the response from the server when it returns
    request.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            console.log("The request and response were successful!");
       }
    };

    // Use the post method to send data asynchronously 
    request.open('POST', url, true);
    // Set necessary headers for server authentication
    request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded; charset=UTF-8');
    request.setRequestHeader('X-CSRF-TOKEN', token);
    // Send the data and wait for the response
    request.send(data);
}

Ajax: A Revolutionary Web Communication Tool

Used for seamless communication between a browser and its hosting server, Ajax cannot access other servers.

Asynchronous operation enables normal website functioning until the server response triggers:

if (this.readyState == 4 && this.status == 200) { }

To handle the response.

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