var attempt = 3;
function validate(){
var username = document.getElementById("username").value;
var password = document.getElementById("password").value;
if ( username == "root" && password == "root"){ // here is password and username
sweetAlert ("Login successfully");
window.location = "success.html";
return false;
}
else{
attempt --;// Decrementing by one.
sweetAlert("You have  "+attempt+" attempt(s) left.");
// Disabling fields after 3 attempts.
if( attempt == 0){
sweetAlert("Oops...", "You have failed  to log in 3 times, Fields have been turned off. Please try again later", "error");
document.getElementById("username").disabled = true;
document.getElementById("password").disabled = true;
document.getElementById("submit").disabled = true;
return false;
}
}