JQuery :: Validate Method Will Not Work - Skips Validation

Using JQuery validation plugin, it will work in css, class='required", but I use method to validate, it will not work. The coding is below. It will skip the validation and go to server.

function saveNew(){
$("#my_form").validate({
errorLabelContainer: $("#RegisterErrors"),
rules: {
scope: { required: true }
},
messages: {scope: "scope is required" }
});
$("#my_form").submit();
}
<div id="RegisterErrors" style="display:none" ></div>