JAVASCRIPT

ajax request in javascript

fetch('https://api.covid19api.com/summary')
            .then(response => response.json())
            .then(data => console.log(data))
            .catch(err => {
                console.log(err)
            });

ajax syntax in javascript

var id = empid;

$.ajax({
    type: "POST",
    url: "../Webservices/EmployeeService.asmx/GetEmployeeOrders",
    data: "{empid: " + empid + "}",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(result){
        alert(result.d);
        console.log(result);
    }
});

AJAX JAVASCRIPT FUNCTION CALLS

function ajaxGetRequest(path, callback){
  let request = new XMLHttpRequest();
  request.onreadystatechange = function(){
    if (this.readyState === 4 && this.status === 200){
        callback(this.response);
    }
  };
  request.open("GET", path);
  request.send();
}

function ajaxPostRequest(path, data, callback){
  let request = new XMLHttpRequest();
  request.onreadystatechange = function(){
    if (this.readyState === 4 && this.status === 200){
      callback(this.response);
    }
  };
  request.open("POST", path);
  request.send(data);
}

how to call ajax javascript

var xhr = new XMLHTTPRequest();