jquery for loop is not working in dialog div button click

Question

This is jQuery code while button click the for loop is not working in dialog div submit date button please some one help me friends. . .

$("#dialog-form").dialog({
    autoOpen: false,
    height: 300,
    width: 350,
    modal: true,
    buttons: {
        "Submit Date": function () {
            for (var j = 1; j <= MGDval; j++) {
                alert($('S' + j).val());
            }
            $(this).dialog("close");
        },
        Cancel: function () {
            $(this).dialog("close");
        }
    },
    close: function () {
        $(this).dialog("close");
    }
});

Answer 1

alert($('S'+j).val());

change to :

alert($('#S'+j).val()); // => for ID

alert($('.S'+j).val()); // => for Class

if selector element "S" : "#S" or ".S"

Answer 2

s does nor refer to any thing chnage to .s for class or #s for Id

alert($('#S'+j).val());

alert($('.S'+j).val());