1- Add a HtMLinputButton in the markup
<input type="button" onclick="ClearList();" value="Clear Selections">
and add a corresponding javascript:
<script language="javascript">
function ClearList()
{
var list = document.getElementById("ListBox1");
if (list) list.selectedIndex =-1;
}
</script>
2- Add a Button server control:
<asp:Button ID="btnDeselect" Runat="server" Text="De-Select"></asp:Button>
and in the codebehind:
Private Sub btnDeselect_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnDeselect.Click
ListBox1.ClearSelection()
End Sub
3- You can insert a list item with a blank value for the user to click if
you wish them to deselect a previously selected item, e.g.
Dim li As New ListItem("No Selection", "")
listbox1.Items.Insert(0, li)
--
HTH,
Phillip Williams
http://www.societopia.net http://www.webswapp.com [quoted text, click to view] "rpress" wrote:
> In a multi-select listbox one may deselect items, but this does not
> work in a single select listbox. Has anyone come across a way to do
> this? (deselect so that no items are selected)
>
> Thanks
>
Unfortunately the default behavior of the ListBox does not allow for
deselecting a selected item by clicking on it. You can try handling the
onclick event to the ListBox (client-side):
<asp:ListBox ID="ListBox1" Runat="server" onclick="toggle();">
<%-- here are the list items --%>
</asp:ListBox>
and in the Javascript
function toggle()
{
var list = window.event.srcElement;
if (list)
{
if (list.selectedIndex == prevIndex) list.selectedIndex=-1;
prevIndex = list.selectedIndex;
}
}
This should produce the effect that you were hoping for; namely "to deselect
simply by clicking on the selected item."
--
HTH,
Phillip Williams
http://www.societopia.net http://www.webswapp.com [quoted text, click to view] "rpress" wrote:
>
>
> Thanks for the input - I was hoping for a way to deselect simply by
> clicking on the selected item.
>
> *** Sent via Developersdex
http://www.developersdex.com ***
Thanks, Phillip - I will give it a try!
Thanks again - I decided to use the following code on the mousedown
event to give the effect that a right mouse click clears the listbox.
function toggle()// toggle clears single select listbox on mouse down
{
var list = window.event.srcElement;
list.selectedIndex=-1;
}
works for me. ;>)
Hello,
Just wondering what exactly is prevIndex?
When attempting to use the suggestion below this value does not exist and causes an error.
Thanks
From
http://www.google.com.au/search?hl=en&client=firefox-a&rls=org.mozilla:en-GB:official&q=deselect+listbox+previndex&btnG=Search&meta=
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