Question

for (var i = 0; i < 3; i++){
    $.ajax({
        url: "ajax.php",
        success: function(data){
            alert(i);
        }
    });
}

I need a solution to get alerts with “0”, “1” and “2”. Аt this time of course I see 3 alerts with “3”.

Answer 1

You need to put a closure around your $.ajax() call.

for (var i = 0; i < 3; i++){
    (function (loop_var) {
        $.ajax({
            url: "ajax.php",
            success: function(data){
                alert(loop_var);
            }
        });
    })(i);
}

Currently it is outputting 3 as my the time the Ajax returns the value of i is indeed 3.