vb.net radio button list check if selected - asp.net

I have the following:
<asp:RadioButtonList ID="rbIsRep" runat="server" RepeatDirection="horizontal" >
<asp:ListItem Value="1" >Yes</asp:ListItem>
<asp:ListItem Value="0" >No</asp:ListItem>
</asp:RadioButtonList>
how do I check if the radiobuttonlist has any selected items?


Use the SelectedIndex proprty to check if anything is selected and the SelectedItem property to get the selected item's text:
If rbIsRep.SelectedIndex > - 1 Then
Dim selectedItemsText = "You selected: " & rbIsRep.SelectedItem.Text
End If
You can change the selection programmatically for example with the SelectedValue property.
rbIsRep.SelectedValue = "0"
or declaratively from aspx
<asp:RadioButtonList ID="rbIsRep" runat="server" RepeatDirection="horizontal" >
<asp:ListItem Value="1" >Yes</asp:ListItem>
<asp:ListItem Selected="True" Value="0" >No</asp:ListItem>
</asp:RadioButtonList>


One way to do it:
var hasSelection = yourRadioButtonList.SelectedIndex != -1;
And for VB.NET:
Dim hasSelection = yourRadioButtonList.SelectedIndex <> -1

Related

ASP.NET Set RadioButton to Select by a String Value

I have a RadioButton control with 3 buttons.
I am retrieving a value from SharePoint list, and to select the RR control according to the value retrieved.
Which of the following is the correct method to use?
ResignationTypeRBList.SelectedValue = _request.ResignationType;
ResignationTypeRBList.SelectedItem = _request.ResignationType;
ResignationTypeRBList.SelectedIndex = _request.ResignationType;
<asp:RadioButtonList ID="ResignationTypeRBList" RepeatDirection="Horizontal" runat="server" CausesValidation="false">
<asp:ListItem Text="Resignation" Value="Resignation" Selected="True"></asp:ListItem>
<asp:ListItem Text="NPL" Value="NPL"></asp:ListItem>
<asp:ListItem Text="Others" Value="Others"></asp:ListItem>
</asp:RadioButtonList>
Thank you

If you are getting Value from Sharepoint list, then assign that to SelectedValue
ResignationTypeRBList.SelectedValue = "NPL";

Drop down should not display all the dropdown values

The drop down I am using is statically bound.
<asp:DropDownList ID="StartTime" runat="server" BackColor="#FFFF80" Font-Names="Arial"
Font-Size="Small" style="text-align: center" Width="56%">
<asp:ListItem Value="12:00 AM"></asp:ListItem>
<asp:ListItem Value="12:30 AM"></asp:ListItem>
<asp:ListItem Value="1:00 AM"></asp:ListItem>
<asp:ListItem Value="1:30 AM"></asp:ListItem>
<asp:ListItem Value="2:00 AM"></asp:ListItem>
<asp:ListItem Value="2:30 AM"></asp:ListItem>
<asp:ListItem Value="3:00 AM"></asp:ListItem>
</asp:DropDownList>
Later I am retrieving the inserted value from DB and displaying it to the user from front end like:
ss.Append("FRE_PLANNED_START_DATE = '" & PlannedStartDate.Text & "',")
ss.Append("FRE_PLANNED_COMP_DATE = '" & CompDate.Text & "',")
Is it possible to show only the selected value and not the other drop down option to the user?
For example, while inserting the selected 12:00 AM and again front end should show only 12 and not display remaining drop down options.

You can hide one by setting its Enabled property to false:
StartTime.Items[0].Enabled = false;
You can loop it to disable all but one selected.
Wouldn't disabling DropDownList work as well?

how to select multiple items in ListBox

How can I select multiple item in ListBox in VB.NET code.
Example:
I have item 1, 5, 8 - then I want to select those items in ListBox in page load
ListBoxSample item
Item “aa1” Value =1
Item “aa2” Value =2
Item “aa3” Value =3
Item “aa4” Value =4
Item “aa5” Value =5
Item “aa6” Value =6
Item “aa7” Value =7
Item “aa8” Value =8

You first need to ensure that multiple items can be selected(default is single-selection). Therefore use the SelectionMode-property:
<asp:ListBox id="listBox1" runat="server" SelectionMode="Multiple">
<asp:ListItem Value="1">aa1</asp:ListItem>
<asp:ListItem Value="2">aa2</asp:ListItem>
<asp:ListItem Value="3">aa3</asp:ListItem>
<asp:ListItem Value="4">aa4</asp:ListItem>
<asp:ListItem Value="5">aa5</asp:ListItem>
<asp:ListItem Value="6">aa6</asp:ListItem>
<asp:ListItem Value="7">aa7</asp:ListItem>
<asp:ListItem Value="8">aa8</asp:ListItem>
</asp:ListBox>
In an ASP.NET-ListBox there is no SelectedIndices property or something like that. So you need to loop them and set the ListItem's Selected property accordingly:
string[] selectedValues = { "1", "5", "8" }; // from session or whatever
foreach (ListItem item in listBox1.Items)
item.Selected = selectedValues.Contains(item.Value);
Remember to do that only if(!Page.IsPostBack) and not on every postback in Page_Load. Otherwise you're overwriting the user-changes and the SelectedIndexChanged-event won't fire.

To enable multi selection you need to set the selection mode to multiple in windows application
ListBox1.SelectionMode = SelectionMode.MultiSimple
ListBox1.SetSelected(1, True)
ListBox1.SetSelected(5, True)
ListBox1.SetSelected(8, True)
If it is ASP listBox then you can statically selected items as
<asp:ListBox id="drop1" rows="3" runat="server" AutoPostBack="True">
<asp:ListItem selected="true">Item 1</asp:ListItem>
<asp:ListItem>Item 2</asp:ListItem>
<asp:ListItem>Item 3</asp:ListItem>
<asp:ListItem>Item 4</asp:ListItem>
<asp:ListItem selected="true">Item 5</asp:ListItem>
<asp:ListItem>Item 6</asp:ListItem>
<asp:ListItem>Item 7</asp:ListItem>
<asp:ListItem selected="true">Item 8</asp:ListItem>
</asp:ListBox>
If you want to set it dynamically means you can use
drop1.SelectionMode = ListSelectionMode.Multiple
drop1.Items(0).Selected = True
drop1.Items(1).Selected = True
drop1.Items(2).Selected = True

Set Enable False ListItems

I have a RadioButtonList and ListItems attached to the RadioButtonList how can I set enable=false the ListItem on code behind cus I don't have id??
<asp:RadioButtonList ID="rblSearchMode" runat="server" RepeatDirection="Horizontal">
<asp:ListItem Text="By Location" Selected="True" Value="0" onclick="searchModeClick();"></asp:ListItem>
<asp:ListItem Text="By Name" Value="1" onclick="searchModeClick();"></asp:ListItem>
</asp:RadioButtonList>

To disable an item, find it using FindByText or FindByValue, then set the item's 'Enabled' property: -
var item = rblSearchMode.Items.FindByText("By Location");
if (item != null)
{
item.Enabled = false;
}

vb.net radio button selection

I have the following in vb.net
<asp:RadioButtonList ID="rbEdit5" runat="server" RepeatDirection="horizontal" >
<asp:ListItem Value="1" >Yes</asp:ListItem>
<asp:ListItem Value="0" >No</asp:ListItem>
</asp:RadioButtonList>
I need to programatically select one of the 2 listitems.
How do I programatically select say 'Yes' above in vb.net

This should work:
rbEditTop25.Items.FindByText("Yes").Selected = True

rbEditTop25.SelectedValue = "1"
Should do the trick!

For Each li As ListItem In rbEditTop25.Items
If li.Text= "Yes" Then
li.Selected = True
End If
Next

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