ajaxindnn.js

$('#submit-items').click(function(e) {
    e.preventDefault();
    if ($('#Form').validate().form()) {
        var items = new Array();
        $('#income-list li').each(function(intIndex) {
            var $item = $(this);
            var incomeItem = {
                CategoryId: $item.data('categoryId'),
                Amount: $item.data('amount')
            };
            items.push(incomeItem);
        });

        var proxy = new ServiceProxy("/DesktopModules/AdvancedAjaxInDnnDemo/WebService1.asmx/");
        proxy.invoke("Save", {
            userId: DemoViewContext.UserId,
            incomeItems: items
        }, function(result) {
            alert(result);
        });
    }
});