jQuery validate different field depending on a checkbox

Question

I\'m trying to use jQuery validation plugin to validate a form I have on one of my applications.

The form (simplified) is as follow :

Answer 1

You can use the depends option like

var validator = $('#form').validate({
    rules: {
        my_select_1: {
            required: {
                depends: function () {
                    return $('#my_select_checkbox').is(':checked')
                }
            }
        },
        my_select_2: {
            required: {
                depends: function () {
                    return !$('#my_select_checkbox').is(':checked')
                }
            }
        }
    },
    messages: {}
});

Demo: Fiddle