how to find checked radio button in a gridview?

问题

how to find checked radio button? there is a hatml input with type of radio and has 4 options to select called o1 o2 o3 and o4. i can access the radio buttons with no problem. how should i check which option is selected?

<asp:GridView OnRowCommand="SelectedPollGridView_RowCommand" ID="SelectedPollGridView" runat="server" AutoGenerateColumns="False" DataKeyNames="PollID" DataSourceID="SelectedPollSqlDataSource">
    <Columns>
        <asp:TemplateField>
            <HeaderTemplate>
                <p runat="server" id="HeaderPTag" class="text-center"><small><%#Eval("Header") %></small></p>
            </HeaderTemplate>
            <ItemTemplate>
                <p runat="server" id="BodyPTag" class="text-right"><%#Eval("Body") %></p>
                <asp:Label Visible="false" ID="PollIDLabel" runat="server" Text='<%#Eval("PollID") %>'></asp:Label>

                <div runat="server" id="MainDiv">
                    <div runat="server" id="O1Div">
                        <label runat="server" id="O1Label">
                            <input runat="server" type="radio" name="OptionsOne" id="O1" value='<%#Eval("PollID") %>'>
                            <%#Eval("O1") %>
                        </label>
                    </div>
                    <div runat="server" id="O2Div">
                        <label runat="server" id="O2Label">
                            <input runat="server" class="pull-right" type="radio" name="OptionsTwo" id="O2" value='<%#Eval("PollID") %>'>
                            <%#Eval("O2") %>
                        </label>
                    </div>
                    <div runat="server" id="O3Div">
                        <label runat="server" id="O3Label">
                            <input runat="server" class="pull-right" type="radio" name="OptionsThree" id="O3" value='<%#Eval("PollID") %>'>
                            <%#Eval("O3") %>
                        </label>
                    </div>
                    <div runat="server" id="O4Div">
                        <label runat="server" id="O4Label">
                            <input runat="server" class="pull-right" type="radio" name="OptionsFour" id="O4" value='<%#Eval("PollID") %>'>
                            <%#Eval("O4") %>
                        </label>
                    </div>
                </div>
                <asp:Button CommandArgument='<%# ((GridViewRow) Container).RowIndex %>' CommandName="foo" CssClass="btn btn-info" ID="SubmitPollButton" runat="server" Text="ثبت نظر" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SelectedPollSqlDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:GUOTSConnectionString %>" SelectCommand="SELECT DISTINCT [PollID], [Header], [Body], [O1], [O1Vis], [O2], [O2Vis], [O3], [O1Cnt], [O2Cnt], [O3Cnt], [O3Vis], [O4], [O4Cnt], [O4Vis], [PollDate] FROM [Poll] ">
<SelectParameters>
    <asp:QueryStringParameter Name="PollID" QueryStringField="PollID" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>

and im using this code to access it:

protected void SelectedPollGridView_RowCommand(object sender, GridViewCommandEventArgs e)

{
    if (e.CommandName == "foo")
    {
        // Convert the row index stored in the CommandArgument
        // property to an Integer.
        int index = Convert.ToInt32(e.CommandArgument);

        // Retrieve the row that contains the button clicked 
        // by the user from the Rows collection.      
        GridViewRow row = SelectedPollGridView.Rows[index];

        System.Web.UI.HtmlControls.HtmlInputRadioButton O1Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O1");
        System.Web.UI.HtmlControls.HtmlInputRadioButton O2Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O2");
        System.Web.UI.HtmlControls.HtmlInputRadioButton O3Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O3");
        System.Web.UI.HtmlControls.HtmlInputRadioButton O4Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O4");
        Label myPollIDLAbel = (Label)row.FindControl("PollIDLabel");
    }
}

now how should i check which radio button has selected?

thank you very much.

回答1:

HtmlInputRadioButton has a properties names Checked (return boolean type), you could use this prop. to check which radio button has selected.

For sample, after you get the radio button control in RowCommand event handler, then you have to check the prop. like this:

System.Web.UI.HtmlControls.HtmlInputRadioButton O1Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O1");
System.Web.UI.HtmlControls.HtmlInputRadioButton O2Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O2");
System.Web.UI.HtmlControls.HtmlInputRadioButton O3Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O3");
System.Web.UI.HtmlControls.HtmlInputRadioButton O4Radio = (System.Web.UI.HtmlControls.HtmlInputRadioButton)row.FindControl("O4");

if(O1Radio.Checked)
{
  //O1Radio is selected.
} 
else if(O2Radio.Checked)
{
  //O2Radio is selected.
}
else if(O3Radio.Checked)
{
  //O3Radio is selected.
}
else if(O4Radio.Checked)
{
  //O4Radio is selected.
}

EDIT

To group radiobuttons, you should set the same name for all radiobuttons in a group:

...
<input runat="server" type="radio" name="Options" id="O1" value='<%#Eval("PollID") %>' />
...
<input runat="server" type="radio" name="Options" id="O2" value='<%#Eval("PollID") %>' />
...
<input runat="server" type="radio" name="Options" id="O3" value='<%#Eval("PollID") %>' />
...
<input runat="server" type="radio" name="Options" id="O4" value='<%#Eval("PollID") %>' />
...

回答2:

I had a similar kind of situation some time back, that i solved using the below logic.

for (int i = 0; i < myGrid.Rows.Count; i++) //Check if item is selected  
        {
          if (((CheckBox)myGrid.Rows[i].FindControl(cbname)).Checked) //If selected            
            {
                .... //Magic Happens
            }
        }

So all the rows have checkbox in the grid, and the loop iterates through all the data and checks if the row is selected. Hope it helps :)

Khizer Jalal

来源：https://stackoverflow.com/questions/20323615/how-to-find-checked-radio-button-in-a-gridview