Is there a way, in an ASP MVC project using unobtrusive validation, to dynamically remove the Required attribute from an element?

The element is decorated with a Required annotation in the view model. I thought I could remove this by removing the html attribute, data-val-required, with JQuery but client validation still treats the element as required. Is it impossible to manipulate the element's validation by manipulating the unobtrusive validation attributes?

This is what I tried, but it didn't work. I wanted to remove the required attribute if a check box was unchecked.

$(#chkTempHire).click(function () {



    var checked = $(this).attr(checked);

    var attr = $(#txtTempHireEndDate).attr(data-val-required);

    var hasAttr = false;



    if (typeof attr !== typeof undefined && attr !== false)

        hasAttr = true;



    if (!checked && hasAttr)

        $(#txtTempHireEndDate).removeAttr(data-val-required);

});

Am I missing something, or is it just not possible?

Thank you!