Question

我是c＃编程的新手我有一个radiobuttonlist（它包含两个radiobuttons employee和department）和一个下拉列表。如果我在没有任何radiobuttonlist选择的情况下选择下拉列表，我想显示错误消息。如果有一个radiobutton，我们可以使用radiobutton.ckecked属性。如何在radiobutton列表中完成相同的操作？我的设计来源是

 <asp:RadioButtonList ID="rbllist"  runat="server" AutoPostBack="True" 
   RepeatDirection="Horizontal" Width="297px" 
  onselectedindexchanged="rbllist_SelectedIndexChanged">
   <asp:ListItem Text="Employee" Value="1" ></asp:ListItem>
   <asp:ListItem Text="Department" Value="2"></asp:ListItem>
   </asp:RadioButtonList>
  <table class="ui-accordion">


  <tr>

 <td align="left" class="style2">
 <asp:Label ID="lbldept" runat="server" Text="Department"></asp:Label></td>
 <td align="left">
 <asp:UpdatePanel ID="UpdatePanel3" runat="server">
 <ContentTemplate>
 <asp:DropDownList ID="dddept" runat="server" AutoPostBack="True" 
 onselectedindexchanged="dddept_SelectedIndexChanged">
 </asp:DropDownList>
 </ContentTemplate>
 </asp:UpdatePanel>

 </td>
 </tr>

是不是？

if (rbllist.SelectedIndex == -1)
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert", "alert('Please select one radiobuttonlist filed ..!!');", true);
        }

Answer 1

您可以使用RequiredFieldValidator

<asp:DropDownList ID="dddept" runat="server" AutoPostBack="True" 
 onselectedindexchanged="dddept_SelectedIndexChanged">
</asp:DropDownList>

<asp:RequiredFieldValidator InitialValue="-1" ID="Req_ID" Display="Dynamic" 
    ValidationGroup="g1" runat="server" ControlToValidate="dddept"
    Text="*" ErrorMessage="Please Select Dept"></asp:RequiredFieldValidator>

OR

<asp:DropDownList ID="dddept" runat="server" AutoPostBack="True" 
 onselectedindexchanged="dddept_SelectedIndexChanged">
<asp:ListItem Text="--Select--" Value="0"/> 
<asp:ListItem Text="Value1" Value="1"/> 
</asp:DropDownList>


<asp:RequiredFieldValidator InitialValue="0" ID="Req_ID" Display="Dynamic" 
    ValidationGroup="g1" runat="server" ControlToValidate="dddept"
    Text="*" ErrorMessage="Please Select Dept"></asp:RequiredFieldValidator>

Answer 2

<asp:RadioButtonList ID="rbllist"  runat="server" AutoPostBack="True" 
   RepeatDirection="Horizontal" Width="297px" 
  onselectedindexchanged="rbllist_SelectedIndexChanged">
   <asp:ListItem Text="Employee" Value="1" ></asp:ListItem>
   <asp:ListItem Text="Department" Value="2"></asp:ListItem>
   </asp:RadioButtonList> 
<asp:RequiredFieldValidator   
            ID="ReqiredFieldValidator1"  
            runat="server"  
            ControlToValidate="rbllist"  
            ErrorMessage="Select atleast anyone"  
            >  
        </asp:RequiredFieldValidator>

试试这个......

Answer 3

如果您想首先在客户端验证，您可以执行以下操作，因为您使用的是ASP.NET 4

注意：最好始终在服务器端进行验证，可能是在提交或相关事件之后。

设置＆＃34; ClientIDMode＆＃34;到＆＃34;静态＆＃34;在radiobuttonlist和下拉列表中，如下所示：

<asp:RadioButtonList ID="rbllist" runat="server" AutoPostBack="True"
        RepeatDirection="Horizontal" Width="297px"
        OnSelectedIndexChanged="rbllist_SelectedIndexChanged" ClientIDMode="Static">

<asp:DropDownList ID="dddept" runat="server" AutoPostBack="True"
          OnSelectedIndexChanged="dddept_SelectedIndexChanged" ClientIDMode="Static">

您可以使用Javascript / Jquery进行客户端检查。但在Jquery中你可以检查如下：

<script>
        $("select[id$=dddept]").click(function () {
            var isOneRadioSelected = false;
            $("#rbllist").find(":radio").each(function (index, radio) {
                isOneRadioSelected = radio.checked;
                if (isOneRadioSelected == true)
                    return false;
            });

            if (isOneRadioSelected == false) {
                alert("Please select atleast one radio button."); //Here you can do proper error display format based on your application requirement.
            }
        });
    </script>

如果未选择radiobittonlist，如何显示错误消息？

3 个答案: