Question

ASP.NET 3.5 help: RadioButtons in DataList ItemTemplates

Asked by: andriatja

I'm using C# for code-behind; how can I get the value of the selected radio buttons if they are in a DataList ItemTemplate?

<form runat="server">
        <h2><asp:Label ID="SurveyName" runat="server"></asp:Label></h2>
        <p><asp:Label ID="SurveyDesc" runat="server"></asp:Label></p>
        <p>
            <asp:DataList ID="DataList1" runat="server" DataKeyField="ID" 
                DataSourceID="LinqDataSource1">
                <ItemTemplate>
                    <asp:Label ID="TextLabel" runat="server" Text='<%# Eval("Text") %>' />
                    <br />
                    <asp:RadioButton ID="RadioButton1" runat="server" 
                    Text='<%# Eval("OptionA") %>' GroupName="answer" />
                <br />
                <asp:RadioButton ID="RadioButton2" runat="server" 
                    Text='<%# Eval("OptionB") %>' GroupName="answer" />
                <br />
                <asp:RadioButton ID="RadioButton3" runat="server" 
                    Text='<%# Eval("OptionC") %>' GroupName="answer" />
                <br />
                <asp:RadioButton ID="RadioButton4" runat="server" 
                    Text='<%# Eval("OptionD") %>' GroupName="answer" />
                    <br />
                    <br />
                </ItemTemplate>
            </asp:DataList>
            <input id="Submit1" type="submit" value="Submit" /></p>
        
        <asp:LinqDataSource ID="LinqDataSource1" runat="server" 
            ContextTypeName="assignment2.SFGSDataContext" TableName="Questions">
        </asp:LinqDataSource>
        
        </form>

                                  
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Asked On
2009-08-19 at 12:43:57ID24666108
Tags

ASP.NET

Topics

Active Server Pages (ASP)

,

Programming for ASP.NET

Participating Experts
1
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500
Comments
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Answers

 

by: guru_samiPosted on 2009-08-19 at 13:19:02ID: 25136870

You can use RadioButtonList instead of 4 RadioButton and grouping them...and then get the value of the Selected RadioButtonItem like below:

foreach (DataListItem item in DataList1.Items)
        {
              if (item.ItemType == ListItemType.Item ||item.ItemType == ListItemType.AlternatingItem)
        {
            RadioButtonList rbl =(RadioButtonList) item.FindControl("RadioButtonList");
            if (rbl != null)
            {
                string selectedValue = rbl.SelectedValue.ToString();
            }
        }
        }

Now again you did not mention when and where you are trying to retrieve this value...
the code above loops through all the DL items.

REF: http://quickstarts.asp.net/QuickStartv20/aspnet/doc/ctrlref/standard/radiobuttonlist.aspx

 

by: andriatjaPosted on 2009-08-20 at 03:09:46ID: 25140721

I've tried using a RadioButtonList, but am unable to figure out how to make the data binding work. My table has the following columns: ID, SurveyID, Text, OptionA, OptionB, OptionC, and OptionD, and I need to display the four options for each question. However, the data binding would only allow me to choose one column.

 

by: guru_samiPosted on 2009-08-20 at 08:12:28ID: 25143520

When using RBL I think you will have to set values for individual RB Item in RBL in the DataList ItemDataBound event...in case you have single row to bind....I am sure its doable but need to think on that code...
In mean while this is what you can try for Your RBs with GroupName...the concept remains the same as before just little logic change...

foreach (DataListItem item in DataList1.Items)
        {
              if (item.ItemType == ListItemType.Item ||item.ItemType == ListItemType.AlternatingItem)
        {
            for (int i = 1; i <=4; i++)
          {
             RadioButton myButton = (RadioButton) item.FindControl("RadioButton" + i);

             if (myButton!=null && myButton.Checked)
            {
                string selectedValue = "You selected " + myButton.Text + "<br />";
                break; //no need to loop further
             }
            }
        }
        }

Check for any syntax error ...but hope you get the idea...
Ref: http://www.codingforums.com/archive/index.php/t-135878.html

 

by: andriatjaPosted on 2009-08-20 at 08:17:16ID: 25143594

But how would you access elements such as the RadioButtonList inside the ItemTemplate? I couldn't figure that out.

 

by: guru_samiPosted on 2009-08-20 at 08:20:08ID: 25143648

The code is looping through the Items in DataList...
item.FindControl is finding the control in each item i.e. ItemTemplate.

 

by: andriatjaPosted on 2009-08-20 at 08:38:57ID: 25143891

Upon Submit I need to create data entries for each question to add to a Response table (ID, QuestionID, Selection) using LINQ. What do you think is the best way to go about this? By the way I have replaced the submit button with an ASP.NET control.

<form runat="server">
        <h2><asp:Label ID="SurveyName" runat="server"></asp:Label></h2>
        <p><asp:Label ID="SurveyDesc" runat="server"></asp:Label></p>
        <p>
            <asp:DataList ID="DataList1" runat="server" DataKeyField="ID" 
                DataSourceID="LinqDataSource1">
                <ItemTemplate>
                    <asp:Label ID="TextLabel" runat="server" Text='<%# Eval("Text") %>' />
                    <br />
                    <asp:RadioButton ID="RadioButton1" runat="server" 
                    Text='<%# Eval("OptionA") %>' GroupName="answer" />
                <br />
                <asp:RadioButton ID="RadioButton2" runat="server" 
                    Text='<%# Eval("OptionB") %>' GroupName="answer" />
                <br />
                <asp:RadioButton ID="RadioButton3" runat="server" 
                    Text='<%# Eval("OptionC") %>' GroupName="answer" />
                <br />
                <asp:RadioButton ID="RadioButton4" runat="server" 
                    Text='<%# Eval("OptionD") %>' GroupName="answer" />
                    <br />
                    <br />
                </ItemTemplate>
            </asp:DataList>
            <asp:Button ID="btnSubmit" runat="server" onclick="btnSubmit_Click" 
                Text="Submit" />
        </p>
        
        
        <asp:LinqDataSource ID="LinqDataSource1" runat="server" 
            ContextTypeName="assignment2.SFGSDataContext" TableName="Questions">
        </asp:LinqDataSource>
        
        </form>

                                              
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by: guru_samiPosted on 2009-08-20 at 09:10:54ID: 25144252

Sorry but I am not very familiar using Linq but I will point out few things that you need:

1: Upon Submit ButtonClick ...loop through items in DataList / get values and add them to Response Table
2: How to get RB value I provided in my previous post.....now what you need it QuestionID which you can get from DataKeyField value
3: Find out how you update tables using Linq and push that value into table (this part I am not aware of but I am sure it will be simple like just calling some Update method or so)

foreach (DataListItem item in DataList1.Items)
        {
              if (item.ItemType == ListItemType.Item ||item.ItemType == ListItemType.AlternatingItem)
        {
            string Selection;
            string QuestionID;
            for (int i = 1; i <=4; i++)
          {
             RadioButton myButton = (RadioButton) item.FindControl("RadioButton" + i);

             if (myButton!=null && myButton.Checked)
            {
                Selection = "You selected " + myButton.Text + "<br />";
                break; //no need to loop further
             }
            }
            QuestionID =DataList1.DataKeys[item.ItemIndex].ToString();

          //At this point you have QuestionID and Selection values
          //Use LinqDataSource to update your Response Table...not sure how to do this.
        }
        }

20120131-EE-VQP-002

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