MVC 4 Javascript form Submit issue

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Javascript

MVC4

Hi guys

I have an issue where I submit my form on completion of a javascript function.

The submit works, but it loses the values in my model.

<script type="text/javascript">
    function changeSubjectPhaseForStudent(subjectID, studentID) {
        var theForm = document.getElementById("frmStudent");

        theForm.submit();
    }
</script>

@model StudentController.StudentMetrics 
    
@using (Html.BeginForm("Student", "Student", Model,FormMethod.Get, new { id = "frmStudent" }))
{
@Html.DropDownListFor(x => x.PhaseID, (List<SelectListItem>)ViewBag.Phases, new { onchange = string.Format("changeSubjectPhaseForStudent({0},{1})", Model.SubjectID, Model.StudentID), id = "cmbPhase" })
}

Under normal circumstances, the model retains its values when it submits back into the controller. It's only when the form is submitted via the above jscript that it returns only a few values, not all.

Can anyone see what I am doing wrong???

Thanks in advance.