Question

我正在尝试使用以下代码来获取对modalpopupextender的引用，但是当我检查javascript变量'modal'的值时，它总是为null。使用javascript获取AJAX控件引用的正确方法是什么？

的.vb

        Dim myStringBuilder As New StringBuilder(246)
        myStringBuilder.AppendFormat("      <script type=""text/javascript"">{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("            var modal = $find('<%=modal1.ClientID%>');{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("            debugger;{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("            $find('<%=modal1.ClientID%>').add_showing({0}", Environment.NewLine)
        myStringBuilder.AppendFormat("                function(){0}", Environment.NewLine)
        myStringBuilder.AppendFormat("                {{{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("                    alert(""Modal popup will be showing"");{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("                }}{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("            );{0}", Environment.NewLine)
        myStringBuilder.AppendFormat("      </script>{0}", Environment.NewLine)
        ClientScript.RegisterStartupScript(Me.GetType(), "myJSalert", myStringBuilder.ToString())

的.aspx

        <ajaxToolkit:ModalPopupExtender ID="mpeResetConfirm" runat="server"
        TargetControlID="btnReset" PopupControlID="pnlConfirmation" BehaviorID="modal1"/>

Answer 1

我怀疑问题的一部分是在调用脚本时没有渲染popupextenders。所以在谷歌搜索后我找到了这篇文章：http://forums.asp.net/p/1413275/3112082.aspx#3112082。这是我最终得到的解决方案：

的.aspx

    <ajaxToolkit:ModalPopupExtender ID="mpeResetConfirm" runat="server"
    TargetControlID="btnReset" PopupControlID="pnlConfirmation" BehaviorID="modal1"/>
    <script type="text/javascript" language="javascript">
        function pageLoad() 
        {
            var modal = $find('modal1');
            debugger;
            $find('modal1').add_showing(
                function()
                {
                    alert("Modal popup will be showing");
                }
           );  
        }
    </script>

Answer 2

尝试

$find('IDofModalPopupExtender')

而不是

$find('<%=modal1.ClientID%>')

无法使用javascript获取对ModalPopupExtender的引用

2 个答案: