Develop Reference

Is it possible to run code if visitor IP is from a specific country

I want to run a this code only if a visitor is from a specific country
window.onload=function(){
document.getElementById("buy").click();
};
I tried this but didn't work :
var requestUrl = "http://ip-api.com/json";
var xhr = new XMLHttpRequest();
xhr.open('POST', requestUrl, true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.onload = function () {
var json = JSON.parse(xhr.responseText)
if(json.country == 'France'){
document.getElementById("buy").click();
};
};
xhr.send(null);

Here's an easy way to do it with that same API:
fetch('http://ip-api.com/json').then(response => {
return response.json();
}).then(data => {
if (data.country == "France") {
document.getElementById("buy").click();
}
});
Or if you prefer jQuery:
$.getJSON("http://ip-api.com/json", function(data) {
if (data.country == "France") {
$("#buy").click();
})
});

How to remove jQuery from this code?

Due to some reason, I don't want to use jQuery in this JavaScript code:
$(function() {
var url = ; //webhook URL here
var content = "Hiii";
var username = "Hi";
$.post(url, {"content": content, "username": username});
});
Is there any way to convert this into a code that doesn't require jQuery?

First off, you can replace the $() with something like
document.addEventListener('DOMContentLoaded', (e) => {})
Secondly if you're only targeting newer browsers you can make use of fetch.
document.addEventListener('DOMContentLoaded', (e) => {
var url = ; //webhook URL here
var content = "Hiii";
var username = "Hi";
fetch(url, {
method: 'POST',
body: JSON.stringify({
content: content,
username: username,
})
});
});
or fallback to using plain XHR
var oReq = new XMLHttpRequest();
oReq.open("POST", url, true);
oReq.send({
content: content,
username: username,
});

var content = "Hiii";
var username = "Hi";
var http = new XMLHttpRequest();
var url = "your API url";
http.open("POST", url, true);
//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.onreadystatechange = function() {//Call a function when the state changes.
if(http.readyState == 4 && http.status == 200) {
alert(http.responseText);
}
}
http.send({"content": content, "username": username});
You can use XMLHttpRequest to make AJAX call like above.

How to send AJAX post request and receive back JSON data in Vanilla JS?

I have used JQuery example to send form data and receive back JSON data. Now I would like to do the same thing in plain/vanilla Javascript. Here is example of my JQuery code:
$('.frmSubmitData').on('submit', function(e){
e.preventDefault();
var formData = $('#myForm').serialize();
console.log(formData);
$.ajax({
type: 'POST',
encoding:"UTF-8",
url: 'Components/myTest.cfc?method=testForm',
data: formData,
dataType: 'json'
}).done(function(obj){
if(obj.STATUS === 200){
console.log(obj.FORMDATA);
}else{
alert('Error');
}
}).fail(function(jqXHR, textStatus, errorThrown){
alert("Error: "+errorThrown);
});
});
And here is what I have so far in plain JS:
function sendForm(){
var formData = new FormData(document.getElementById('myForm')),
xhr = new XMLHttpRequest();
xhr.open('POST', 'Components/myTest.cfc?method=testForm');
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.onload = function() {
if (xhr.status === 200) {
console.log(xhr.responseText);
}else if (xhr.status !== 200) {
alert('Request failed. Returned status of ' + xhr.status);
}
};
xhr.send(formData);
}
I think that something is wrong in way how I handle response with JSON data. If anyone can help me with problem please let me know. Thank you.

Optimally, for Firefox/Chrome/IE and legacy IE support, first determine the request type:
function ajaxReq() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if (window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
} else {
alert("Browser does not support XMLHTTP.");
return false;
}
}
Then, send the request:
var xmlhttp = ajaxReq();
var url = "http://random.url.com";
var params = "your post body parameters";
xmlhttp.open("POST", url, true); // set true for async, false for sync request
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send(params); // or null, if no parameters are passed
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
try {
var obj = JSON.parse(xmlhttp.responseText);
// do your work here
} catch (error) {
throw Error;
}
}
}

Detect browser tab close without jquery and send some data to php file

I have wrote a script that send some data to an external php file without jquery.
<script type="text/javascript">
var statsPage = 'http://www.my-url.com/response.php';
function ca(c,o,n,t,e,t,u){return p={type:c,userid:o,gender:n}}
ca("pageview", "1", "male");
var params = Object.keys(p).map(function(k) {
return encodeURIComponent(k) + '=' + encodeURIComponent(p[k])
}).join('&')
const req = new XMLHttpRequest();
//req.addEventListener('load' /*callback after req is complete*/);
req.open('GET', statsPage + '?' + params);
req.send();
req.onreadystatechange = function() {
if (req.readyState == XMLHttpRequest.DONE) {
alert(req.responseText);
}
}
</script>
What i also want to do is to send data when the browser tab is closed, so i wrote a script like below but it is not working. I don't get a response from the php file here.
navigator.sendBeacon = navigator.sendBeacon || function () {
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://www.my-url.com/response.php?pag_title=1');
xhr.send();
xhr.onreadystatechange = function() {
if (xhr.readyState == XMLHttpRequest.DONE) {
alert(xhr.responseText);
}
}
};
I found also this script but it gives me also no response from the response.php file as an alert:
window.onbeforeunload = function() {
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://www.my-url.com/response.php?pag_titel=1', true);
// If specified, responseType must be empty string or "text"
xhr.responseType = 'test';
xhr.onload = function () {
if (xhr.readyState === xhr.DONE) {
if (xhr.status === 200) {
//console.log(xhr.response);
//console.log(xhr.responseText);
alert(xhr.responseText);
}
}
};
xhr.send(null);
}
EDIT
I did also the following test but now it gives me an alertbox with the value 1 first and then an alert with the response of the function ca (see first part of the code on top for the function). So i think the onbeforeunload is not working here. If i close browser tab i get nothing in response.
window.onbeforeunload = function() {
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://www.digital-productions.be/dev/analytics/response.php?pag_titel=1', true);
// If specified, responseType must be empty string or "text"
xhr.responseType = 'test';
xhr.onreadystatechange = function() {
if (xhr.readyState == XMLHttpRequest.DONE) {
alert(xhr.responseText);
}
}
xhr.send(null);
}

You can use the beforeunload event to execute code before the user leaves the page, or you could warn them that there is unsaved changes. You can return a message by using e.returnValue = "Message";.
window.addEventListener("beforeunload", function(e) {
//code
});
Here is a link from the mozilla documentation: https://developer.mozilla.org/en/docs/Web/Events/beforeunload

Signature does not match s3 GET object

I have an image in the amazon s3 which has ACL of autherized-users. I'm trying to retrieve that image with GET method. The javascript method (in angular js) looks like this
(In the following example, response contains the necessary data such as authHeader)
var uri = 'https://sample.s3.amazonaws.com/sample/image.jpg';
var postParams = response.data;
var xhr = new XMLHttpRequest();
xhr.addEventListener("load", downloadComplete, false);
xhr.addEventListener("error", downloadFailed, false);
xhr.addEventListener("abort", downloadCanceled, false);
function downloadComplete(e) {
var xhr = e.srcElement || e.target;
if(xhr.status === 200) { //success status
}
else {
}
}
function downloadFailed(e) {
debugger;
}
function downloadCanceled(e) {
debugger;
}
xhr.open('GET', uri, true);
xhr.setRequestHeader('Authorization', postParams.authHeader);
xhr.setRequestHeader('x-amz-content-sha256', postParams.payloadHash);
xhr.setRequestHeader('Host', "sample.s3.amazonaws.com");
xhr.setRequestHeader('x-amz-date', postParams.date);
xhr.send();
But I get a 403 exception which says SignatureDoesNotMatch. Is there anything i'm doing wrong? I'm quite sure that the values i'm providing are correct.
Thanks in advance