// 2. Named
Callback Functions
<!DOCTYPE html>
<html>
<head>
<script>
function loadDoc(fncall)
{
var xhttp=new
XMLHttpRequest();
xhttp.onreadystatechange = function()
{
if (this.readyState == 4 && this.status
== 200)
{
fncall(this);
}
};
xhttp.open("GET",
"Hello.txt", true);
xhttp.send();
}
function CallBkFn(xhttp)
{
document.getElementById("demo").innerHTML = xhttp.responseText;
}
</script>
</head>
<body>
<div
id="demo">
<h2>Ajax
callback functions </h2>
<button
type="button" onclick="loadDoc(CallBkFn)"> Change Content </button>
</div>
</body>
</html>
// Input
file – Hello.txt
<h2>Hello
and Welcome to Ajax</h2>
