按钮上的Sharepoint webpart下拉列表selectedindex值始终为-1

问题描述

我通过SPService在Webpart中绑定我的下拉列表，如下所示：

I bind my dropdownlist in Webpart through SPService like this:

$(document).ready(function () {
       FillDropDown();
   });
 function FillDropDown() {
       var index = 0;
       $("#filterCountry").empty();
 $().SPServices({
           operation: "GetList",
           listName: "Pages",
           async: false,
           completefunc: function (xData, Status) {
               $(xData.responseXML).find("Field[DisplayName='Country'] CHOICE").each(function () {
                   //if (index == 0) {
                   //    $(".filterCountry").append("<option value='0'>--Select--</option>");
                   //}
                   listItem = "<option value=" + $(this).text() + ">" + $(this).text() + "</option>";
                   $("#filterCountry").append(listItem);
                   index++;
               })
 }
       })

下拉列表设计：

dropdownlist design :

  <div class="country">
            <span class="pull-left mar-top-5">Country</span>
            <asp:DropDownList ID="filterCountry" runat="server" ClientIDMode="Static" CssClass="form-control pull-right country_drop_down"></asp:DropDownList>

        </div>
<div class="go">
            <asp:Button runat="server" CssClass="btn btn-primary" ID="btnSubmit" OnClick="btnSubmit_Click" Text="Go" />
        </div>

Codeside：

Codeside:

 protected void btnSubmit_Click(object sender, EventArgs e)
        {

        ViewState["Query"]) = null;
//            BindReapterMain(Convert.ToString(ViewState["Query"]));
        }

问题是当我点击Button我得到dropdownlist selectedindex总是-1而不是获得selectedindex = 2那个我已选择..请帮助任何解决方案

The issue is when i click on Button i get dropdownlist selectedindex always -1 instead of getting selectedindex = 2 that i have selected.. Please help to any solution

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