Question

我的网页上有以下代码。

table>
    <tr>
        <td class="style2"> <asp:ValidationSummary 
        ID="ValidationSummary1" 
        runat="server" 
        HeaderText="Following error occurs....." 
        ShowMessageBox="false" 
        DisplayMode="BulletList" 
        ShowSummary="true"
        BackColor="Snow"
        Width="200"
        ForeColor="Red"
        Font-Size="X-Large"
        Font-Italic="true" EnableClientScript="true" />
        </td>

    </tr>
        <tr>
            <td valign="top" class="style2">
                Test1 : &nbsp;
                <asp:DropDownList ID="ddlTest1" runat="server">
                </asp:DropDownList>
                <asp:RequiredFieldValidator ID="ReqTest1" runat="server" ControlToValidate="ddlTest1" InitialValue="Please Select" ErrorMessage="Please Select Test1"></asp:RequiredFieldValidator>
            </td>

            <td valign="top">
                <asp:DropDownList ID="ddlLocation" runat="server">
                </asp:DropDownList>
                <asp:RequiredFieldValidator ID="ReqLocation" runat="server" ControlToValidate="ddlLocation"  InitialValue="Please Select" ErrorMessage="Please select a Location"></asp:RequiredFieldValidator>
            </td>
        </tr>

当我点击提交按钮而没有选择任何下拉列值时，我没有收到任何错误消息。我的下拉代码是

Private Sub Test1()
    ddlTest.DataSource = ' called the class to bid the drop down
  ddlTest.DataTextField = "Test"
    ddlTest.DataValueField = "Testid"
    ddlTest.DataBind()
    ddlTest.Items.Insert(0, New ListItem("Please Select", 0))

End Sub

Public Sub LoadLocation()
    ' ddlLocation.DataSource = ' called the class to bid the drop down


    ddlLocation.DataTextField = "location"
    ddlLocation.DataValueField = "id"
    ddlLocation.DataBind()
    ddlLocation.Items.Insert(0, New ListItem("Please Select", 0))
End Sub

任何帮助将不胜感激。当我点击提交按钮并且控件转移到提交按钮后面的代码时，我看不到任何错误消息。

Answer 1

Dropdown验证有点不同。您需要在验证程序中设置InitialValue以验证和选择非选择错误

<asp:RequiredFieldValidator ID="ReqTest1" runat="server" InitialValue=0 ControlToValidate="ddlTest1" InitialValue="Please Select" ErrorMessage="Please Select Test1"></asp:RequiredFieldValidator>

InitialValue是下拉列表中默认显示的列表项的任何值。

在处理任何事情之前，在按钮点击事件中检查Page.IsValid也很重要。

验证摘要中不显示错误消息

1 个答案: