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我在尝试获取用户输入的弹出窗口中有一个 DropDownList。我还有一个用于获取用户输入的“onselectedIndexChanged”。我将整个 DropDownList 放在 updatePanel 中，因此只有 DropDownList 得到更新。（弹出窗口是使用 JQuery/JS 构建的）我使用 JS 到 hiddenfield 值然后将其传递给另一个函数）这是我的代码：

<div id="ddlFiles">
    <label>
        Select new CaseFile:</label>
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <asp:UpdatePanel runat="server" ID="UpdatePanel1">
        <ContentTemplate>
            <asp:DropDownList runat="server" ID="ddlCaseFilesNew" DataSourceID="dsCaseFiles"
                DataTextField="Display" DataValueField="FileID" OnPreRender="ddl_PreRender" Width="300px"
                AutoPostBack="true" OnSelectedIndexChanged="ddlCaseFilesNew_SelectedIndexChanged">
                <asp:ListItem>Item 1</asp:ListItem>
            </asp:DropDownList>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="ddlCaseFilesNew" EventName="SelectedIndexChanged" />
        </Triggers>
    </asp:UpdatePanel>
</div>

这是我的 selectedIndexChanged：

<script runat="server">
    protected void ddlCaseFilesNew_SelectedIndexChanged(object sender, EventArgs e)
    {
        hidNewCaseFile.Value = ddlCaseFilesNew.SelectedItem.Value;
    }
</script>

现在由于某种原因，只要我从列表中选择某些内容，它就会将我发送到“找不到资源”页面。我不知道为什么会这样。我的网址如下所示：

http://localhost:49355/base/Expenses/ViewExpenses.aspx?CaseFileID=2001

当我尝试选择一个值时，它会打开该错误（找不到资源）页面并说我找不到链接。

这是错误的图片：在此处输入图像描述

页面加载：

Response.Cache.SetAllowResponseInBrowserHistory(false);
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    if (!isLoggedIn())
        return;

    if (Request.QueryString["ExpenseID"] != null)
    {
        if (!IsPostBack)
        {
            ddlCaseFilesNew.DataSourceID = "dsCaseFiles";
            ddlCaseFilesNew.SelectedIndex = -1;
            ddlCaseFilesNew.DataTextField = "Display";
            ddlCaseFilesNew.DataValueField = "FileID";
            ddlCaseFilesNew.DataBind();
            if (Request.QueryString["CaseFileID"] != null)  // from view>casefiles>casefile#>notes
                hidCaseFile.Value = Request.QueryString["CaseFileID"].ToString();
        }
    }
    if (Request.QueryString["CaseFileID"] != null)  // from view>casefiles>casefile#>notes
        hidCaseFile.Value = Request.QueryString["CaseFileID"].ToString();
    else if (Request.QueryString["FileID"] != null && Request.QueryString["TaskID"] != null)    // from view>task>specific task notes
    {
        hidCaseFile.Value = Request.QueryString["FileID"].ToString();
        hidTaskID.Value = Request.QueryString["TaskID"].ToString();
    }
}

protected void ddl_PreRender(object sender, EventArgs e)
{
    DropDownList ddl = (DropDownList)sender;
    try
    {
        if (ddl.Items[0].Value != "-1")
            ddl.Items.Insert(0, new ListItem("--Select--", "-1"));
    }
    catch
    {
        ddl.Items.Insert(0, new ListItem("--Select--", "-1"));
    }

}
4

1 回答 1

1

尝试为您的 UpdatePanel 设置 UpdateMode="Conditional"，然后再试一次。

<asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
于 2012-10-01T19:46:48.253 回答