我在对 Datalist 中的 CheckBoxList 使用RequiredField Validator 时遇到问题。我正在为投票选项使用复选框列表。我希望用户回答所需的投票问题。如果用户没有回答,我想显示一条错误消息。谁能帮我做到这一点?
这是我的设计:
<div id="divPollDataList">
<asp:DataList ID="PollDataList" runat="server"
onitemdatabound="PollDataList_ItemDataBound">
<ItemTemplate>
<asp:HiddenField ID="PollIDReqHiddenField" Value='<%# Eval("PollID") %>' runat="server" Visible="false" />
<asp:Label ID="lblReqQuestionNumber" runat="server" Text='<%# Eval("No of PollQuestion") %>' Font-Bold="true"></asp:Label>
<asp:Label ID="lblRequiredPollQusetion" runat="server" Text='<%# Eval("PollQuestions") %>' Font-Bold="true"></asp:Label>
<asp:HiddenField ID="HiddenFieldPollOption" runat="server" Value='<%# Eval("PollOptions") %>' Visible="false" />
<asp:HiddenField ID="HiddenFieldPollType" runat="server" Value='<%# Eval("PollType") %>' Visible="false"/>
<asp:RequiredFieldValidator ID="RequiredFieldValidatorReqPoll" runat="server" CausesValidation="true" ControlToValidate="CheckBoxListMultiple" Display="Dynamic" ErrorMessage="You must provide the feedback" ></asp:RequiredFieldValidator>
<asp:CheckBoxList ID="CheckBoxListMultiple" runat="server" ></asp:CheckBoxList>
</ItemTemplate>
</asp:DataList>
</div>
<div>
<asp:Button ID="btnSubmitPoll" runat="server" CausesValidation="true" Text="Submit" OnClick="btnSubmitPoll_click" />
</div>
<div>
<asp:Button ID="btnBindData" runat="server" Text="Bind"
onclick="btnBindData_Click" />
</div>
这是我的代码:
protected void PollDataList_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
System.Data.DataRowView drv = (System.Data.DataRowView)(e.Item.DataItem);
string strPollID = drv.Row["PollID"].ToString();
string pollOptions = drv.Row["PollOptions"].ToString();
string strPollType = drv.Row["PollType"].ToString();
string strPollRequiredorNot = drv.Row["RequiredPoll"].ToString();
CheckBoxList chkList = (CheckBoxList)e.Item.FindControl("CheckBoxListMultiple");
foreach (string opt in pollOptions.Split('}'))
{
chkList.Items.Add(opt.ToString());
}
var validator = (RequiredFieldValidator)e.Item.FindControl("RequiredFieldValidatorReqPoll");
validator.Enabled = true;
}
}