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Radiobutton Problem

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Join Date: Feb 2008

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Radiobutton Problem

Mar 13th, 2008

I have created a custom user control which contains a radiobutton and some another controls.
In my page, I use more than one instance of this control, so the user can check the radiobutton of all the instances of this control.

the question:
How to force that only one radiobutton to be selected.

Last edited by peter_budo; Mar 27th, 2008 at 5:03 am. Reason: Extensive use of colour tags is not good idea

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john8098

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Re: Radiobutton Problem

Mar 14th, 2008

dim ctl as control
for each ctl in controls
if type of ctl is radiobutton then
if ctl.name <>radiobuttonSELECTED.name then
ctl.check=false
endif
endif
next

i think this may solve your problem. thank's me.

Last edited by john8098; Mar 14th, 2008 at 11:48 am.

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Re: Radiobutton Problem

Mar 14th, 2008

Dont have the radio button in the control. Use a repeater to render radio button, user control pairs.

==========================================
Yadda yadda yadda...
Web junky, fevered monkey

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Re: Radiobutton Problem

Mar 15th, 2008

Hi,

You can set the GroupName Property of the Radio Button. Check this topic in MSDN--RadioButton.GroupName Property

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Radiobutton Problem

Mar 17th, 2008

I have implemented radio button in a gridview,where in user can select any one of the radiobutton in the gridview.If you need i can post the solution.

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Re: Radiobutton Problem

Mar 27th, 2008

ok,please send me this solution

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Re: Radiobutton Problem

Mar 27th, 2008

Hi Bright,
I am at office,it may take 3 hours to reach home.I will post the solution without fail.
Thanks
ravichandra

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Re: Radiobutton Problem

Mar 27th, 2008

aspx

Help with Code Tags

(Toggle Plain Text)

 <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
        BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px"
        CellPadding="4" DataKeyNames="ProductID" DataSourceID="SqlDataSource1" PageSize="5"
        Style="z-index: 100; left: 241px; position: absolute; top: 65px" OnRowCreated="GridView1_RowCreated">
        <FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
        <RowStyle BackColor="White" ForeColor="#330099" />
        <Columns>
            <asp:TemplateField HeaderText="Select">
            <ItemTemplate>
            <asp:Literal ID="RadioButtonMarkup" runat="server"></asp:Literal>
            </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="ProductID" HeaderText="ProductID" ReadOnly="True" SortExpression="ProductID" />
            <asp:BoundField DataField="ProductName" HeaderText="ProductName" SortExpression="ProductName" />
        </Columns>
        <PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
    </asp:GridView>

I have used Template field and within the template instead of a radiobutton i have used a Literal control which will be converted into RadioButton in code behind.

The literal control is converted into a HTML radio button and to make the ids of each radiobutton unique i am passing the rowindex of the grid.This makes all the radiobutton unique and user can select any one of the radiobutton.

When the page is displayed no radio button is checked initially.(Note* if you need you can make the first radiobutton as checked by default by removing the commented code //(!Page.IsPostBack && e.Row.RowIndex==0).

aspx.cs

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
 
 protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Literal output = (Literal)e.Row.FindControl("RadioButtonMarkup");
            output.Text=string.Format(@"<input type=radio name='ProductGroup' "+@"id='RowSelector{0}' value='{0}' 
 
",e.Row.RowIndex);
 
            if((ProductsSelectedIndex==e.Row.RowIndex))// ||(!Page.IsPostBack && e.Row.RowIndex == 0))
 
                output.Text += @"checked='checked' ";
            output.Text += "/>";
 
 
        }
    }
 protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Literal output = (Literal)e.Row.FindControl("RadioButtonMarkup");
            output.Text=string.Format(@"<input type=radio name='ProductGroup' "+@"id='RowSelector{0}' value='{0}' 

",e.Row.RowIndex);

            if((ProductsSelectedIndex==e.Row.RowIndex))// ||(!Page.IsPostBack && e.Row.RowIndex == 0))

                output.Text += @"checked='checked' ";
            output.Text += "/>";
        

        }
    }

The following property ProductsSelectedIndex is accessed to check whether any of the radiobutton is checked, if none is

checked then it returns -1 or it return an integer value and if this value is equal to the row index then that radiobutton is

made checked.

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
 
private int ProductsSelectedIndex
    {
        get
        {
            if (string.IsNullOrEmpty(Request.Form["ProductGroup"]))
                return -1;
            else
                return Convert.ToInt32(Request.Form["ProductGroup"]);
        }
    }
private int ProductsSelectedIndex
    {
        get
        {
            if (string.IsNullOrEmpty(Request.Form["ProductGroup"]))
                return -1;
            else
                return Convert.ToInt32(Request.Form["ProductGroup"]);
        }
    }

Finally you may click on Button to perform whatever is required for your requirement.

Have alook at the following sample code:

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
 
protected void Button1_Click(object sender, EventArgs e)
    {
        if (ProductsSelectedIndex < 0)
        {
            Label2.Text = "Please make a selection";
            Label2.Visible = true;
        }
        else
        {
            int productId = Convert.ToInt32(GridView1.DataKeys[ProductsSelectedIndex].Value);
            Label1.Text = productId.ToString();
            Label2.Visible = false;
        }
 
 
    }
protected void Button1_Click(object sender, EventArgs e)
    {
        if (ProductsSelectedIndex < 0)
        {
            Label2.Text = "Please make a selection";
            Label2.Visible = true;
        }
        else
        {
            int productId = Convert.ToInt32(GridView1.DataKeys[ProductsSelectedIndex].Value);
            Label1.Text = productId.ToString();
            Label2.Visible = false;
        }


    }

If the ProductSelectedIndex < 0, it means none of the radio button is selected and i have used a label control to display
the message "Please make a selection"
If any one the radio button is checked i am retrieving the key values and displaying it in the Label1.

If still you have doubt, i can clarify the issue.

Thanks Mr Scott Mitchel(Microsoft)
Good Luck.

ravichandra

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Re: Radiobutton Problem

Mar 27th, 2008

Thanx 4 ur interest.

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Re: Radiobutton Problem

#10

Jul 16th, 2008

The code within Button1_Click function throws a run time exception. Use this one instead.

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
protected void Button1_Click(object sender, EventArgs e)
    {
        if (ProductsSelectedIndex < 0)
        {
            Label2.Text = "Please make a selection";
 
        }
        else
        {
            GridViewRow gd = GridView1.Rows[ProductsSelectedIndex];
            Label2.Text = gd.Cells[0].Text;   // replace 0 with the column whose text you want
        }
 
 
    }
protected void Button1_Click(object sender, EventArgs e)
    {
        if (ProductsSelectedIndex < 0)
        {
            Label2.Text = "Please make a selection";
            
        }
        else
        {
            GridViewRow gd = GridView1.Rows[ProductsSelectedIndex];
            Label2.Text = gd.Cells[0].Text;   // replace 0 with the column whose text you want
        }


    }

Thanks