Adding dynamic parameters with Html.BeginForm and jQuery submit
// html <% using (Html.BeginForm("MyAction", "MyController", new { id = ViewContext.RouteData.Values["id"] }, FormMethod.Post, new { enctype = "multipart/form-data", class="myForm" })) { %> <input type="file" name="blah" /> <% } %> // script $container.find('.myButton').click(function() { $container.find('.myForm').submit(); }); Before the form is submitted, I need to add some extra parameters (route values) which can only be calculated at the time of submit. How do I do that? You could append a hidden field to the form before submitting it: $container.find('.myButton').click(function() { var