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Web Server Controls->ASP.NET ListBox Control

2007-03-27 09:34 531 查看

Definition and Usage

The ListBox control is used to create a single- or multi-selection drop-down list.

Each selectable item in a ListBox control is defined by a ListItem element!

Tip: This control supports data binding!

Properties

Property	Description
AutoPostBack	A Boolean value that specifies whether the form should be posted immediately after the index of the selected item has changed or not. Default is false
BorderColor	Specifies the color of the border around the drop-down list
BorderStyle	Specifies the style of the border around the drop-down list
BorderWidth	Specifies the width of the border around the drop-down list
DataSource	The data source to use
DataTextField	A field in the data source to be displayed in the drop-down list
DataValueField	A field in the data source that specifies the value of each selectable item in the drop-down list
id	A unique id for the control
OnSelectedIndexChanged	The name of the function to be executed when the index of the selected item has changed
Rows	Specifies the height of the control
runat	Specifies that the control is a server control. Must be set to "server"
SelectionMode	Allows single or multiple selections. Legal values: "single" and "multiple". Default is "single"

Examples

Listbox
ASPX Source:

<script runat="server">
Sub submit(Sender As Object,e As EventArgs)
mess.Text="You selected " & drop1.SelectedItem.Text
End Sub
</script>

<html>
<body>

<form runat="server">
<asp:ListBox id="drop1" rows="3" runat="server">
<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>Item 5</asp:ListItem>
<asp:ListItem>Item 6</asp:ListItem>
</asp:ListBox>
<asp:Button Text="Submit" OnClick="submit" runat="server" />
<p><asp:label id="mess" runat="server" /></p>
</form>

</body>
</html>

Output Result:

Item 1
Item 2
Item 3
Item 4
Item 5
Item 6

If you select the ListBox "Item 6" and the click the button "Submit",It will show:

Item 1
Item 2
Item 3
Item 4
Item 5
Item 6

You selected Item 6

In this example we declare one ListBox control in an .aspx file. Then we create an event handler for the Click event which displays some text and the selected item, in a Label control.

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