Unobtrusive sample

js.js

@Html.Hidden("ajaxUrl",Url.Action(""))
<button type="button" data-ajax-url="@Url.Action("")"></button>
<script>
    $(function () {
        $(":input[data-ajax-url]").click(function (e) {
            e.preventDefault();
            var current = $(this);
            $.ajax({
                type: "POST",
                url: current.data("url"),
                data: "name=John&location=Boston",
                dataType: "json",
                success: function (response) {

                }
            });
        });
       
    });
</script>