Asp：requiredfieldvalidator无效：o [英] Asp:requiredfieldvalidator is not working :o

问题描述

嗨专家，



asp：RequiredFieldValidator无效。代码如下：

Hi Experts,

asp:RequiredFieldValidator is not working. Code is given below:

<tr id="trReportAgency" runat="server">
                            <td class="fieldlabel">
                                <asp:Label ID="lblAgency" runat="server" Text="Agency:"></asp:Label>
                            </td>
                            <td>
                                <asp:DropDownList ID="ddlAgency" runat="server" CssClass="listbox" Width="138px" />
                                <asp:RequiredFieldValidator ID="rqAgency" runat="server" ControlToValidate="ddlAgency"

                                    CssClass="validatorIndicator" Display="Dynamic" ErrorMessage="Please select agency."

                                    InitialValue="-1" Text="i" ToolTip="Please select agency.">
                                </asp:RequiredFieldValidator>
                            </td>
                        </tr>

我们非常感谢任何评论或建议。



我尝试过：



嗨专家，



asp：RequiredFieldValidator不起作用。代码如下：

Any comments or suggestion is highly appreciated.

What I have tried:

Hi Experts,

asp:RequiredFieldValidator is not working. Code is given below:

<tr id="trReportAgency" runat="server">
                            <td class="fieldlabel">
                                <asp:Label ID="lblAgency" runat="server" Text="Agency:"></asp:Label>
                            </td>
                            <td>
                                <asp:DropDownList ID="ddlAgency" runat="server" CssClass="listbox" Width="138px" />
                                <asp:RequiredFieldValidator ID="rqAgency" runat="server" ControlToValidate="ddlAgency"

                                    CssClass="validatorIndicator" Display="Dynamic" ErrorMessage="Please select agency."

                                    InitialValue="-1" Text="i" ToolTip="Please select agency.">
                                </asp:RequiredFieldValidator>
                            </td>
                        </tr>

我们非常感谢任何意见或建议。

Any comments or suggestion is highly appreciated.

推荐答案

使用下面的代码，这可以帮到你：

Use the below code, this may help you:

<table>
            <tr id="trReportAgency" runat="server">
                <td class="fieldlabel">
                    <asp:Label ID="lblAgency" runat="server" Text="Agency:" />
                </td>
                <td>
                    <asp:DropDownList ID="ddlAgency" runat="server" CssClass="listbox" Width="138px" >
                        <asp:ListItem Text="Select" Value="-1"></asp:ListItem>
                        <asp:ListItem Text="1" Value="1"></asp:ListItem>
                        <asp:ListItem Text="2" Value="2"></asp:ListItem>

                        </asp:DropDownList>
                    <asp:RequiredFieldValidator ID="rqAgency" runat="server" ControlToValidate="ddlAgency"

                        CssClass="validatorIndicator" Display="Dynamic" ErrorMessage="Please select agency."

                        InitialValue="-1" Text="Please select agency" ToolTip="Please select agency." />
                    <asp:Button ID="btnPrint" runat="server" Text="Print" OnClick="btnPrint_Click" />
                </td>
            </tr>

        </table>

谢谢，

Thanks,

如果我们使CausesValidation属性为true，那么它正在工作。

If we make "CausesValidation" property is "true" then it is working.

<asp:Button ID="btnPrint" runat="server" CausesValidation="true" Text="Print" OnClick="btnPrint_Click" />

CausesValidation默认值为true。如果你把它弄错，那么你强行说你不想要验证。



参考：

Button.CausesValidation属性（System.Web.UI.WebControls ） [ ^ ]

CausesValidation default value is true. If you make this false then you forcefully saying that you do not want validation to fire.

Reference:
Button.CausesValidation Property (System.Web.UI.WebControls)[^]

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