What's the MVC3 Razor equivalent of Page.Form.DefaultFocus?

If I wanted 开发者_如何学编程to conditionally set which field should have focus using ASP.NET WebForms, I would set Page.Form.DefaultFocus. What is the MVC3 Razor way to do the same?

Background: I have a login page. Sometimes the username field is automatically filled in, sometimes it's blank. If the username field is blank, I want it to have the focus. If the username field is filled in, I want focus on the password field.

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How about using jQuery:

$(function() {
    var username = $('#Username'); // TODO: adjust selector if necessary
    if (username.val() === '') {
        username.focus();
    } else {
        $('#Password').focus(); // TODO: adjust selector if necessary
    }
});