Not getting checkbox checked in mvc using jquery..?

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MVC

jQuery

CheckBoxList

@using (Html.BeginForm(null, null, FormMethod.Post, new { Id = "form" }))
{
    @Html.DropDownList("Roles",newSelectList((IEnumerable<EmployeeManagementSystem.DAO.RoleMaster>)ViewData["Roles"], "RoleId", "RoleName"), "Select Role", new { @id = "ddlRole" })
    <table id="sample_editable_1">
        <tbody>
            @{
                var i = 0;
                foreach (var item in Model)
                {
                    <tr>
                        <td style="display: none">@Html.HiddenFor(modelItem => item.privilegeId, new { @id = "hdnPrivilegeId" + i })
                        </td>
                        <td>@Html.CheckBox("CheckBox",false, new { @id = "chkRolePrivilege" + i ,@name="PrivilegeCheckBox"})
                        </td>
                        <td>@Html.LabelFor(modelITem => item.privilegeName, item.privilegeName, new { @id = "privilegeName" + i, Value = item.privilegeName })
                       </td>
                    </tr>
                    i++;
                }
            }
        </tbody>
    </table>
}

I need to check the checkboxes according to the privileges of the role.But the checkboxes are not checked/unchecked inside the change event of dropdown using jquery. But the check boxes able to be checked inside the $(document).ready(function() but when we do it inside a change event or something its checked attribute is not working and all other attribute such as disabled etc are working fine.

$("#ddlRole").change(function () {
  var roleId = 0;
        var privilegeListName = "";
        var row = $(this).parent().parent();
        roleId = $('#ddlRole :selected').val();
        $.ajax({
            url: "/api/Privilege/GetPrivilegesByRoleId?RoleId=" + roleId,
            type: 'Get',
            contentType: 'application/json; charset=utf-8',
            success: function (data) {

                for (var i = 0; i < 4; i++) {
                    for (var j = 0; j < 4; j++) {
                        if ($('#sample_editable_1 tr #privilegeName' + i).text() == data[j].privilegeName.trim()) {

                            $('#chkRolePrivilege' + i).attr('checked', true);
                            alert("true");
                        }
                        else {
                            alert("false");
                        }
                    }
                }
            }
          });
        });