页面出现未知的运行时错误

<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>点博家教在线</title>
    <link href="css/bbs1.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" EnableScriptLocalization="true"
            EnableScriptGlobalization="true">
        </asp:ScriptManager>
        <table width="1003" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
                    <uc1:WebBBSTop ID="WebBBSTop1" runat="server" />
                </ContentTemplate>
            </asp:UpdatePanel>
            <tr>
                <td class="mid12">
                    <img src="imbbs/bbs16.gif" width="44" height="30" align="absmiddle" />&nbsp;&nbsp;<a
                        href="../Index.aspx" class="news">点博家教在线</a>&nbsp;>&nbsp;<a href="BBSIndex.aspx"
                            class="news">点博论坛</a>&nbsp;>&nbsp;<a href="hotQuestion.aspx" class="news">热门话题</a></td>
            </tr>
            <tr>
                <td style="padding-top: 10px;">
                    <table width="100%" border="0" cellspacing="0" cellpadding="0">
                        <tr>
                            <td class="mid13">
                                热门话题&nbsp;<img src="imbbs/bbs18.gif" width="16" height="16" align="absmiddle" style="padding-bottom: 4px;" />
                                &nbsp;<span id="memo" runat="server"></span>
                            </td>
                        </tr>
                    </table>
                </td>
            </tr>
            <tr>
                <td style="padding-top: 5px;">
                    <table width="100%" border="0" cellspacing="0" cellpadding="0">
                        <tr>
                            <td width="12%" align="left" valign="middle" style="padding-right: 10px;">
                                &nbsp;
                                <asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="imbbs/bbs26.gif" Width="74"
                                    Height="30" OnClick="Back_Click" />&nbsp;<a href="AddQuestions.aspx"><img src="imbbs/bbs20.gif"
                                        width="74" height="30" /></a></td>
                        </tr>
                    </table>
                </td>
            </tr>
            <tr>
                <td>
                    <table width="100%" border="0" cellspacing="0" cellpadding="0">
                        <tr>
                            <td bgcolor="#f5f5f5" class="lcen3" style="border: none; padding: 8px;">
                                <label>
                                    <span class="gray">标题：</span><input id="txtUserName" runat="server" type="text" class="text"
                                        style="width: 310px; height: 18px" />
                                    <asp:UpdatePanel ID="UpdatePanel2" runat="server">
                                        <ContentTemplate>
                                            <span class="gray">所属专区:</span><span id="SQType" runat="server"></span>
                                            <asp:DropDownList ID="ddlqu" runat="server" OnSelectedIndexChanged="ddlQu_SelectIndexChanged"
                                                AutoPostBack="true">
                                            </asp:DropDownList>
                                            <span class="gray">科目</span>&nbsp;&nbsp;&nbsp;<asp:DropDownList ID="ddlzt" runat="server">
                                            </asp:DropDownList>
                                        </ContentTemplate>
                                    </asp:UpdatePanel>
                                </label>
                                <label>
                                </label>
                            </td>
                        </tr>
                        <tr>
                            <td bgcolor="#f5f5f5" class="lcen3" style="border: none; padding: 8px;">
                                <label>
                                    <asp:TextBox ID="Tb_Content" runat="server" TextMode="MultiLine" Width="100%" Height="350"></asp:TextBox>
                                </label>
                            </td>
                        </tr>
                        <tr>
                            <td bgcolor="#f5f5f5" class="lcen3" style="border: none; padding: 8px;">
                                <label>
                                    <asp:Button ID="Button1" runat="server" Text="发表新话题" Style="height: 22px;" OnClick="btn_Click"
                                        OnClientClick="return check()" />
                                </label>
                            </td>
                        </tr>
                    </table>
                </td>
            </tr>
            <uc2:WebBBSFoot ID="WebBBSFoot1" runat="server" />
        </table>
    </form>
</body>
</html><script language="javascript" type="text/javascript">
function check()
{
    var obj = document.getElementById("txtUserName")
        ,str = obj.value.trim(); 
        if(str == "")
        {
            alert("请输入标题！");
            obj.focus();
            return false;
        }
         obj = document.getElementById("ddlqu");
        str = obj.value.trim(); 
        if(str == "0")
        {
            alert("请选择年级！");
            obj.focus();
            return false;
        }
        
         obj = document.getElementById("ddlzt");
        str = obj.value.trim(); 
        if(str == "0")
        {
            alert("请选择科目！");
            obj.focus();
            return false;
       }
        
        var value = KE.html('Tb_Content');
        if (value == '')
        {
           alert("请输入帖子内容！");
           return false;
        }
}
</script><script charset="utf-8" src="../KindEditor/kindeditor.js" type="text/javascript"></script>
<script type="text/javascript">
    KE.show({
        id : '<%=Tb_Content.ClientID%>',
        imageUploadJson : '../../upload_json.ashx',
        fileManagerJson : '../../file_manager_json.asp'
    });</script>  点所属专区下拉框的时候就会出错

解决方案 »

  1.   

    点击所属专区ddlQu_SelectIndexChanged事件里面的错，  自己设置断点调试！
      

  2.   


    影响页面功能吗？
    如果报错，对页面没有影响的话。就屏蔽掉吧window.onerror=function(){return true;}
      

  3.   


    写在<script>window.onerror=function(){return true;}</script>
      

  4.   

    <script language="javascript" type="text/javascript">
    function check()
    {
        var obj = document.getElementById("txtUserName")
            ,str = obj.value.trim(); 
            if(str == "")
            {
                alert("请输入标题！");
                obj.focus();
                return false;
            }
    看到了吗【 var obj = document.getElementById("txtUserName")
            ,str = obj.value.trim(); 
    】这一句，这是什么东西，还能执行啊？
      

  5.   

    这个问题，是一个页面放了两个updatepanel的问题，，怎么解决
      

  6.   

    这个问题，是一个页面放了两个updatepanel的问题，怎么解决