Question

我有一个捐赠表单，其中包含一个更新面板，其中包含预定金额的下拉列表以及“其他”选项“。当选择”其他“时，下拉列表触发了部分回发并使用附加内容呈现更新面板其他“金额的文本框。在此更新面板之外，我有一个额外的服务器控件表单字段，如文本框和提交按钮。

我遇到的错误是选择“其他”按钮“onclick”事件无法触发完整的回发。

示例：

<asp:UpdatePanel ID="updatePanelAmount" runat="server">
    <ContentTemplate>
        <table style="width: 500px;">
        <tbody>
        <tr>
            <th style="width: 200px;"><asp:Label ID="lblAmount" runat="server" CssClass="required" Text="Donation Amount: " /></th>
            <td>
                <asp:DropDownList ID="selAmount" runat="server" />
                <asp:CustomValidator ID="valDonationAmount" runat="server" ControlToValidate="selAmount" ErrorMessage="Donation Amount" Display="None" />
            </td>
        </tr>
        </tbody>
        </table>        
        <asp:Panel ID="panelOther" runat="server" Visible="false">
            <table style="width: 500px;">
            <tbody>
            <tr>
                <th style="width: 200px;"><asp:Label ID="lblOther" runat="server" Text="Other Amount: " /></th>
                <td>
                    $<asp:TextBox ID="txtOther" runat="server" />
                    <asp:RequiredFieldValidator ID="valOther" runat="server" ControlToValidate="txtOther" Display="None" ErrorMessage="Other Amount" Enabled="false" />
                    <asp:RegularExpressionValidator ID="valOtherExpress" runat="server" ControlToValidate="txtOther" Display="None" ErrorMessage="Other Amount: Invalid" ValidationExpression="[1-9][0-9]+(\.[0-9]{2})?" Enabled="false" />
                </td>
            </tr>
            </tbody>
            </table>
        </asp:Panel>                
    </ContentTemplate>           
</asp:UpdatePanel>    
<ctl:CreditCardForm ID="ctlCreditCardForm" runat="server" />
<asp:Button ID="btnSubmit" runat="server" Text="Donate" />

编辑：发布代码隐藏可能会让每个人都更容易

public partial class _Default : System.Web.UI.Page
{
    private ArrayList _donations;

    protected void Page_Init(object sender, EventArgs e)
    {
        valDonationAmount.ServerValidate += new ServerValidateEventHandler(valDonationAmount_ServerValidate);        
        selAmount.AutoPostBack = true;
        selAmount.SelectedIndexChanged += new EventHandler(selAmount_SelectedIndexChanged);
        updatePanelAmount.UpdateMode = UpdatePanelUpdateMode.Conditional;
        updatePanelAmount.ChildrenAsTriggers = true;
        btnSubmit.Click += new EventHandler(btnSubmit_Click);
    }

    void selAmount_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (selAmount.SelectedItem.Text == "Other")
        {
            panelOther.Visible = true;
            valOther.Enabled = true;
            valOtherExpress.Enabled = true;
        }
        else
        {
            panelOther.Visible = false;
            valOther.Enabled = false;
            valOtherExpress.Enabled = false;
        }
    }

    void valDonationAmount_ServerValidate(object source, ServerValidateEventArgs args)
    {
        args.IsValid = true;
        if (args.Value == "0")
        {
            args.IsValid = false;
        }
    }

    void btnSubmit_Click(object sender, EventArgs e)
    {
        Page.Validate();                 
        if (Page.IsValid)
        {

        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {    
        _donations = new ArrayList();
        double[] donations = new double[] { 20.00, 50.00, 100.00, 250.00, 500.00 };
        _donations.AddRange(donations);

        if (!IsPostBack)
        {
            foreach (Double d in _donations)
            {
                selAmount.Items.Add(new ListItem(String.Format("{0:c}", d), String.Format("{0:c}", d)));
            }
            selAmount.Items.Insert(0, new ListItem("Select Donation Amount","0"));
            selAmount.Items.Add(new ListItem("Other", "Other"));
        }        
    }
}

Answer 1

这可能是阻止你的验证者吗？你的按钮是否应该忽略任何验证器？如果是这样，你应该在按钮上设置CausesValidation =“false”，这样即使面板中的验证器无效，它也会触发。

否则，按钮的点击事件将由面板中的验证器停止。

Answer 2

AJAX会在回发，会话等方面造成一些时髦的行为。

<asp:Button ID="btnSubmit" runat="server" Text="Donate" onClick="btnSubmit_Click" />

编辑：也可以尝试这样做：确保您的连接不在“if（！isPostBack）”块中。

Answer 3

将以下代码放在更新面板之外。

<%--dummy validator to make ajax validation possible--%>
        <asp:RequiredFieldValidator runat="server" CssClass="hidden" ControlToValidate="dummyTextBox" ValidationGroup="dummy"></asp:RequiredFieldValidator>
        <asp:TextBox runat="server" ID="dummyTextBox" CssClass="hidden"></asp:TextBox>

        <style>
    .hidden {
      display: none;
    }
    </style>

以下链接为我工作....

http://jeffreypaarhuis.com/2011/08/08/validation-not-working-in-updatepanel/

Answer 4

检查Button控件的AutoPostBack属性。将其设置为“True”。

ASP.NET：UpdatePanel外部的按钮无法返回PostBack

4 个答案: