Pure JavaScript Ajax Call

Below is sample form code to demonstrate the pure JavaScript ajax call.

  <form id="login" action="checkLogin.php" method="post">
    <input class="field-val" type="text" id="username" name="username" placeholder="Username" required>
    <input class="field-val" type="password" id="password" name="password" placeholder="Password" required>
    <button type="submit" name="checklogin" onClick="checkLogin(); return false;">Login</button>

Pure JavaScript ajax call code snippet

function checkLogin(){
  var fieldVal = document.getElementsByClassName("field-val");
    var formContents = new FormData(); 
    for(var i=0; i<fieldVal.length; i++)
        formContents.append(fieldVal[i].name, fieldVal[i].value);
    var xmlHttp = new XMLHttpRequest();
        xmlHttp.onreadystatechange = function()
            if(xmlHttp.readyState == 4 && xmlHttp.status == 200)
                  window.location = '/app/dashboard';
        }"post", "checkLogin.php"); 

How to get and return values in the checkLogin.php

$username = $_POST['username'];
$password = $_POST['password'];
$login= false;
/*-- username and password matching logic starts --*/
$login= true;
/*-- username and password matching logic ends --*/
if ($login==true) { 
    echo "success"; 
echo "Any Error Message will go here";
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