Render Partial View using Jquery Ajax with variable data

I have already read this post, but I am not sure know to make it work taking data from the user. Here is the ajax jquery I am using. I know (or at least think) that this cant render a partial. But it works all the way until the render fails. I thought it may be helpful to have.

 $.ajax(
     {
         type: 'POST',
         contentType: 'application/json; charset=utf-8',
         data: "{'test':" + "'" + dateText + "'}",
         dataType: 'json',
         url: 'Site/Grab/',
         success: function (result) {
         alert('Success');
         },

         error: function (error) {
            alert('Fail');
         }
      });

Here is my controller

[HttpPost]
    public ActionResult Grab(string test)
    {
        DateTime lineDate= Convert.ToDateTime(test);
        List<Info> myInfo= GameCache.Data(lineDate);
       return PartialView("_PartialView", myInfo);
    }