I need to know the difference between a RadioButton and a RadioButtonList, and what are the guidelines to use when deciding which one to use?
I researched this and decided to post my findings here to help illustrate the differences I found that should help clarify my question:
What I Learned:
RadioButton
Used to display a single RadioButton at a time. Likely requires setting group attribute to associate multiple RadioButton controls into a group.
RadioButtonList
Used to Display a group of RadioButton controls, automatically providing the group attribute associating all the included RadioButton controls into a single group.
Observation
Visually, both produce the same result in the UI, provided one places at least 2 or more RadioButton controls on the page with the same value for the group attribute.
UI Sample Code follows
asp:RadioButton
<asp:RadioButton ID="b2b" text="B to B" checked="true" runat ="server" GroupName="businesstype" />
<asp:RadioButton ID="b2c" text="B to C" runat ="server" GroupName="businesstype" />
asp:RadioButtonList
<asp:RadioButtonList ID="businesstype" runat="server" >
<asp:ListItem Selected="True" Value="0">B to B</asp:ListItem>
<asp:ListItem Value="1">B to C</asp:ListItem>
</asp:RadioButtonList>
What are the guidelines for the use of each?
1. RadioButtonList
RadioButtonList is a single control with a list of RadioButtons.
This is derived from ListControl class. So this will work similar to other list controls like ListBox, DropDownList and CheckBoxList.
For giving a caption for buttons you can use the Text property. You cannot insert a text in between two buttons.
Using the “SelectedIndexChanged” event you will get the selected buttons value (“RadioButtonList1.SelectedValue”).
for e.g
private void Bind()
{
RadioButtonList1.DataSource = dsEmployees;
RadioButtonList1.DataTextField = "EmployeeName";
RadioButtonList1.DataValueField = "EmployeeID";
RadioButtonList1.DataBind();
}
If you are using HTML
<asp:RadioButtonList ID="RadioButtonList1" runat="server"
RepeatDirection="Horizontal"
onselectedindexchanged="RadioButtonList1_SelectedIndexChanged">
<asp:ListItem Text="Male" Value="1" ></asp:ListItem>
<asp:ListItem Text="Female" Value="2" ></asp:ListItem>
</asp:RadioButtonList>
2. RadioButton
RadioButton” is a single control, it is derived from “CheckBox” Class. You have to set the GroupName property to identify a group. Also the event handler for the event “CheckedChanged” will help us to do some job. Another one thing is you have to write separate handlers for each radio button.
For e.g.:
<asp:RadioButton ID="RadioButton1" runat="server" GroupName="Gender"
AutoPostBack="true" oncheckedchanged="RadioButton1_CheckedChanged" Text="Male" />
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="Gender"
AutoPostBack="true" oncheckedchanged="RadioButton2_CheckedChanged" Text="Female" />
You can get the selected Index in RadioButtonList as it work on collection of ListItem.
You can visit here for more detail
In contrast, the RadioButtonList control is a single control that acts as a parent control for a collection of radio button list items.
It derives from a base ListControl Class, and therefore works much like the ListBox, DropDownList, and CheckBoxList Web server controls. Therefore, many of the procedures for working with the RadioButtonList control are the same as they are for the other list Web server controls.
An asp:radiobuttonlist creates a group of radiobuttons that ensures when one is selected, the others are deselected whereas asp:radiobutton is not within a group and therefore cannot be deselected by clicking other radio buttons.
Related
Goal: I have 3 dropdowns for 3 different people.
I would like to be able to update the database with value from dropdown that is used. I would like to be able to use more than one dropdown without having to manually refresh the page. It's on Site.Master so they appear on every page.
Problem: the value in the database updates correctly after the update, but the text in the dropdown becomes incorrect if I use more than one dropdown without refreshing the page.
It works fine if user makes a change on first dropdown, then goes to another page, then uses the second dropdown. BUT the view acts strange if I
Change Dropdown1 (e.g. from True to False).
Then change Dropdown2 (True to False).
At this point, dropdown 1 will show True again (even though it was changed to False a couple steps ago).
It's almost as if the first dropdown gets the current value from the second dropdown.
However, if I refresh the page, it shows the appropriate values (and the database has the correct value the entire time)
Probably easier with screenshots:
After changing Professor1 from True to False (OK):
After changing Professor2 from True to False (NOT OK - notice Professor 1 appears as True again, even though its correct in the DB):
What I've tried:
I've used debug breakpoints on every line in the C# I could think of
I've tried moving the code into the OnSelectedIndexChanged method
I've tried changing from .Text to .SelectedValue
I've tried using multiple OnSelectedIndexChanged methods instead of one
HTML:
<div>
<asp:Image ID="img1" runat="server" height="20" width="20"
CssClass="professoricon"/>
<sup><asp:Label ID="myLabel" runat="server" Font-Size="20px"
CssClass="oval"/></sup>
<asp:Label ID="myLabelMid" runat="server" CssClass="professorname"/>
<asp:DropdownList runat="server" id="ddlAvailability1"
AutoPostBack="true"
OnSelectedIndexChanged="ddlAvailability_OnSelectedIndexChanged"
CssClass="dropdowns">
<asp:ListItem ID="LT1"></asp:ListItem>
<asp:ListItem ID="RT1"></asp:ListItem>
</asp:DropdownList>
</div>
<asp:Panel ID="row2" runat="server" Visible="false">
<asp:Image ID="img2" runat="server" CssClass="professoricon"/>
<sup><asp:Label ID="L2" runat="server" Font-Size="20px"
CssClass="oval"/></sup> <asp:Label ID="M2" runat="server"
CssClass="professorname"/>
<asp:DropdownList runat="server" id="ddlAvailability2"
AutoPostBack="true"
OnSelectedIndexChanged="ddlAvailability2_OnSelectedIndexChanged"
CssClass="dropdowns">
<asp:ListItem ID="LT2"></asp:ListItem>
<asp:ListItem ID="RT2"></asp:ListItem>
</asp:DropdownList>
</asp:Panel>
C#:
PageLoad() {
myLabel.Text = professorStatsListDto.professorStatsList[0].NumberOfActiveVisits.ToString();
myLabelMid.Text = professorStatsListDto.professorStatsList[0].LastName.ToString();
LT1.Text = professorStatsListDto.professorStatsList[0].Available.ToString();
RT1.Text = (!professorStatsListDto.professorStatsList[0].Available).ToString();
if (professorStatsListDto.professorStatsList.Count>1)
{
L2.Text = professorStatsListDto.professorStatsList[1].NumberOfActiveVisits.ToString();
M2.Text = professorStatsListDto.professorStatsList[1].LastName.ToString();
LT2.Text = professorStatsListDto.professorStatsList[1].Available.ToString();
RT2.Text = (!professorStatsListDto.professorStatsList[1].Available).ToString();
row2.Visible = true;
}
}
We have a RadioButtonList control inside a Repeater control with two options, Yes or No.
We would like to force our users to choose a Yes or No before proceeding.
In other words, if a user clicks to submit or in our case, click the Next button to go to the next without selecting either Yes or No, an error needs to be raised letting the user know that s/he must select a Yes or No to continue.
The following code uses RequiredValidator control to handle this but it does not do anything.
Any ideas how to resolve this?
Purchased:<asp:radiobuttonlist ID="rblType" runat="server" ValidationGroup ="stype" RepeatDirection="Horizontal" TextAlign="Right" style="display:inline;">
<asp:ListItem Text="Yes" />
<asp:ListItem Text="No" />
</asp:RadioButtonList>
<asp:RequiredFieldValidator id="RequiredFieldValidator1"
ControlToValidate="rblType"
ErrorMessage="required"
ValidationGroup ="stype"
runat="server"/>
Thanks a lot in advance.
I have a webpage which contains radiobuttonlists. I would like to change the radibuttonlist repeatdirection from horizontal to vertical. I am using CSS Skeleton framework. So my page is responsive but asp:RadioButtonList doesnt change.
here is my code
<asp:RadioButtonList ID="rbl_payment_type" runat="server" RepeatDirection="Horizontal" AutoPostBack="true" OnSelectedIndexChanged="rbl_payment_type_SelectedIndexChanged">
<asp:ListItem Value="0">Serbest Ödeme</asp:ListItem>
<asp:ListItem Value="1">Ön Tanımlı Ödeme</asp:ListItem>
</asp:RadioButtonList>
how do I change it repeat direction for responsive html?
You might want to look into the RadioButtonList's RepeatLayout property, which determines if the radio button list is rendered as a table or not. Also, if you are using .NET 4.0 or later, then you have the option for a ordered list or unordered list.
Here is the documentation for RadioButtonList RepeatLayout property
Once you have it in a non-table layout, then I believe it will be more conducive to CSS for a responsive UI.
Is it possible to set Tab Index for ListItems in RadioButtonList. Here is my code:
<asp:RadioButtonList ID="radGender" runat="server">
<asp:ListItem Value="M">Male</asp:ListItem>
<asp:ListItem Value="F">Female</asp:ListItem>
<asp:ListItem Value="U">Not Specified</asp:ListItem>
</asp:RadioButtonList>
Thanks,
Praveen
ASP.Net Cannot tab through all radio buttons when selected
Similar problem to yours. This should help with what you need as well as solve the problem you run into after having a radio buttom selected.
EDIT
Just to specify their solution. It seems after a choice is selected, using the arrow keys will let you move to the other choices where as tab will not. Another solution to getting around this is to have individual radio buttons and group them using the group name property.
What's wrong with?
<asp:RadioButtonList ID="radGender" runat="server">
<asp:ListItem Value="M" tabindex="1">Male</asp:ListItem>
<asp:ListItem Value="F" tabindex="2">Female</asp:ListItem>
<asp:ListItem Value="U" tabindex="3">Not Specified</asp:ListItem>
</asp:RadioButtonList>
Seem to work at least in IE9 and FF (not sure with others).
I'm looking for the best way to handle a change of index being selected on a ASP.net RadioButtonList (C# code behind). I have 3 list items. For the first one, I want it to show a hidden asp:textbox on the page, whereas the other 2 will hide the textbox.
//asp.net side
<asp:RadioButtonList ID="_indicatorAckType" runat="server" RepeatDirection="Horizontal"
enabled="true" OnSelectedIndexChanged="onAckTypeChanged">
<asp:ListItem Text="None" />
<asp:ListItem Text="SHOW" />
<asp:ListItem Text="HIDE" />
</asp:RadioButtonList>
//code behind
protected void onAckTypeChanged(object sender, EventArgs e)
{
if (_indicatorAckType.SelectedItem.Text == "SHOW")
_myTextboxID.Visible = true;
else
_myTextboxID.Visible = false;
}
I initially tried using onclick event handlers, but I've been told that ListItem's cannot use onclick events with radio button items. What am I doing wrong here? This does not throw any errors or have any visibly obvious problems. I have tried making onSelectedIndexChanged do nothing except show the textbox and that doesn't work either.
Any help is appreciated! Thanks everyone.
On the RadioButtonList, set the AutoPostBack attribute to true.
Have a look at this it might help. And I suggest to turn off autopostback if enabled on radio button do it all on client side using jquery.
example:
Using jQuery, hide a textbox if a radio button is selected