[英]How to get selected radio button text in datalist ?
在下面的数据列表中表示一组问题和答案,当用户使用 javascript 单击提交按钮时,如何检查用户是否选择了正确答案单选按钮?
答案存储在数据库中。
数据列表:
<asp:DataList ID="DataList1" runat="server" DataKeyField="Qno"
DataSourceID="SqlDataSource1">
<ItemTemplate>
Qno:
<asp:Label ID="QnoLabel" runat="server" Text='<%# Eval("Qno") %>' />
<br />
Question:
<asp:Label ID="QuestionLabel" runat="server" Text='<%# Eval("Question") %>' />
<br />
<asp:RadioButton ID="RadioButton1" runat="server" Text='<%# Eval("Ans1") %>' />
<br />
<asp:RadioButton ID="RadioButton2" runat="server" Text='<%# Eval("Ans2") %>' />
<br />
<asp:RadioButton ID="RadioButton3" runat="server" Text='<%# Eval("Ans3") %>' />
<br />
<asp:RadioButton ID="RadioButton4" runat="server" Text='<%# Eval("Ans4") %>' />
<br />
<asp:Button ID="Button2" runat="server" Text="Submit" />
<br />
</ItemTemplate>
</asp:DataList>
为 DataList 中的 Button2 提供一个 CommandName 参数: CommandName="Validate"
为 DataList1 添加 OnItemCommand 事件:*OnItemCommand="DataList1_OnItemCommand"*
在后面的代码中,填写 *DataList1_OnItemCommand* 事件动作:
protected void DataList1_OnItemCommand(object sender, DataListCommandEventArgs e)
{
if (String.Equals(e.CommandName, "Validate"))
{
DataListItem dataItem = (DataListItem )e.Item;
RadioButton rbtn1 = (RadioButton)dataItem.FindControl("RadioButton1");
RadioButton rbtn2 = (RadioButton)dataItem.FindControl("RadioButton2");
RadioButton rbtn3 = (RadioButton)dataItem.FindControl("RadioButton3");
RadioButton rbtn4 = (RadioButton)dataItem.FindControl("RadioButton4");
// Code to check which radio button was checked.
if(rbtn1 != null && rbtn1.Checked)
{
}
else if(rbtn2 != null && rbtn2.Checked)
{
} //Perform these for the remaining two check boxes
}
}
根据选中的复选框采取所需的操作。
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