ajax open a request
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
//looking for a change or state , like a request or get.
xhttp.onreadystatechange = function() {
//if equal to 4 means that its ready.
// if equal to 200 indicates that the request has succeeded.
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML = this.responseText;
}
};
//GET method for gettin the data // the file you are requesting
xhttp.open("GET", "TheFileYouWant.html", true);
//sending the request
xhttp.send();
}