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Removed items in asp:listbox re-appear after refresh

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Jan 10.2011

Hi,

This seems really stupid i cant get my head around this.

I have a listbox that has items added to it from selections from another one. I have also added code that an item can be double clicked to remove it, which works, until the page is refreshed and the items all com back.

my code is

[CODE]
 function DeleteItem()
{ var list = document.getElementById(“lstSelected”);
var len = list.options.length;
var i = 0;
alert(len);
for (i = 0; i < len; i++)
{ if(list.options[i].selected)
{ alert(document.getElementById(“lstSelected”)(i).value); list.options[i]=null;
}
}
}
[/CODE]

I wondered if anyone had any ideas

many thanks

to post a comment
JavaScript

2 Comments(s) ↴

Copy linkTweet thisAlerts:
@tpdietzJan 10.2011 — I think it would help us if you posted the HTML.
Copy linkTweet thisAlerts:
@ninjaimpauthorJan 10.2011 — Here it is;
[CODE]
<head runat="server">
<title>Select Compononents</title>
<script language="javascript" type="text/javascript">
function DeleteItem()
{

var list = document.getElementById("lstSelected");
var len = list.options.length;
var i = 0;
alert(len);

for (i = 0; i < len; i++)
{
if(list.options[i].selected)
{
alert(document.getElementById("lstSelected")(i).value);
list.options[i]=null;
}

}

}
</script>
</head>
<body>
<form id="form1" runat="server" name="F1" >
<div>

<asp:DropDownList ID="drpCompParams" runat="server"
Width="366px">
</asp:DropDownList>
<asp:Button ID="btnFilter" runat="server" Text="Filter" />
&nbsp;<asp:Button ID="btnAdd" runat="server" Text="Add" />
<br />
<asp:ListBox ID="lstComps" runat="server" Height="161px"
SelectionMode="Multiple" Width="653px"></asp:ListBox>
<br />

<br />
<asp:ListBox name="S1" ID="lstSelected" runat="server" Height="117px"
Width="652px" >
</asp:ListBox>
<br />
<br />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

</div>
</form>
</body>
[/CODE]
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