Listbox onselected event problem

$enthil · #1 (**permalink**) 10-31-2007, 02:42 AM

I have created a listbox in my aspx page such that the list box have to call ListBox1_SelectedIndexChanged() in server side when selecting any of the items in the listbox. But the function is not triggerred. Here is my code:

Quote:

<asp:ListBox ID="ListBox1" runat="server" Height="167px" Width="250px" OnSelectedIndexChanged="ListBox1_SelectedIndexChan ged" ></asp:ListBox>

it.wily · #2 (**permalink**) 10-31-2007, 04:32 AM

Try this code:

Quote:

<asp:ListBox ID="ListBox1" runat="server" Height="167px" Width="250px" AutoPostBack="true" OnSelectedIndexChanged="ListBox1_SelectedIndexChan ged" ></asp:ListBox>

kingmaker · #3 (**permalink**) 11-01-2007, 10:36 PM

<% @Page Language="C#" %>
<% @Import Namespace="System.Diagnostics" %>
<% @Import Namespace="System.Collections" %>
<html>
<head>
<script language="C#" runat="server">
void Page_Load(Object Src, EventArgs E)
{

}

void OnCounterInfo(Object sender, EventArgs e)
{
string strCategory = Category.SelectedItem.Value;
CounterInstances.Items.Clear();

PerformanceCounterCategory pcCat = new PerformanceCounterCategory(strCategory);
string[] arrInstanceNames = pcCat.GetInstanceNames();
if (arrInstanceNames.GetLength(0) > 1)
{
CounterInstances.DataSource = arrInstanceNames;
CounterInstances.DataBind();
}
}

void SubmitBtn_Click(Object sender, EventArgs e)
{
string strCat = Category.SelectedItem.Value;
string strCounter = Counters.SelectedItem.Value;
string strInstance = "";

if (CounterInstances.Items.Count > 0)
strInstanceName = CounterInstances.SelectedItem.Value;

PerformanceCounter pc =
new PerformanceCounter(strCat, strCounter, strInstance);

float dResult = pc.NextValue();
Message.Text = "<" + strCat + "> [" + strCounter +
"] {" + strInstance + "} = " + dResult.ToString();
}

</script>

</head>

<body>

<h3>Performance Counter Help</h3>

<form runat="server" method="post">
<table width="400">
<tr><td>Category:</td><td>Counter:</td><td>Instances</td></tr>
<tr><td valign="top">
<asp:dropdownlist id="Category" AutoPostBack="True"
DataTextField="CategoryName" DataValueField="CategoryName"
runat=server OnSelectedIndexChanged="OnDisplayCategory" />
</td><td valign="top">
<asp:ListBox id="Counters" Width="200px" runat="server"
DataTextField="CounterName" DataValueField="CounterName"
AutoPostBack="True"
OnSelectedIndexChanged="OnCounterInfo"/>
</td><td valign="top">
<asp:ListBox id="CounterInstances" Width="100px" runat="server" />
</td></tr>
</table>
<asp:button OnClick="SubmitBtn_Click" text="Lookup" runat="server"/>
</form>

</body>
</html>

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