如何在AJAX中使用Jquery？

在这里，我试图根据grade dropdownlist

@Html.editorfor（model=>model.CreditHourAndFullMarksPartialViewViewModels[I].GradePoint，new{htmlAttributes=new{@class=“form control”，@id=“txtGradePoint”}}的变化，在相应的编辑器上设置成绩点值（model=>model.CreditHourAndFullMarksPartialViewViewModels[i].FinalGrade，新选择列表（ViewBag.FinalGrade，“GradePointId”，“Grade”），“--Select Grade--”，新{@class=“form control”，@id=“slcFinalGrade”}

但是，尽管ajax中提供了所有可用的值，但editorfor中的值并未显示。

下面是我的Jquery Ajax

<script>
$("select#slcFinalGrade").change(function () {
    debugger
    var getGradeVal = $("select#slcFinalGrade").val();
    var parameter = { gradePointId: getGradeVal }
    $.ajax({
        url: "/StudentResults/GetGradePoint",
        data: parameter,
        type: "GET",         
        success: function (data) {
            debugger
            $(this).closest('tr').find('input#txtGradePoint').val(data)
        }
    })
});
</script>

---

您只需在回调中指向正确的

此

$("select#slcFinalGrade").change(function () {
    var $select = $(this);
    var getGradeVal = $("select#slcFinalGrade").val();
    var parameter = { gradePointId: getGradeVal }
    $.ajax({
        url: "/StudentResults/GetGradePoint",
        data: parameter,
        type: "GET",         
        success: function (data) {
            // this in here refers to success callback function..
            $select.closest('tr').find('input#txtGradePoint').val(data)
        }
    })
});

 public decimal GetGradePoint(int gradePointId)
    {
        var getPoint = db.GradePoints.Where(x => x.GradePointId == gradePointId).FirstOrDefault().Points;
        return Convert.ToDecimal(getPoint);
    }

$("select#slcFinalGrade").change(function () {
    var $select = $(this);
    var getGradeVal = $("select#slcFinalGrade").val();
    var parameter = { gradePointId: getGradeVal }
    $.ajax({
        url: "/StudentResults/GetGradePoint",
        data: parameter,
        type: "GET",         
        success: function (data) {
            // this in here refers to success callback function..
            $select.closest('tr').find('input#txtGradePoint').val(data)
        }
    })
});