CheckBoxList Control

Definition and Usage

The CheckBoxList control is used to create a multi-selection check box group.

Each selectable item in a CheckBoxList 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 one of the items changes select status or not. Default is false
CellPadding	The space, in pixels, between the cell walls and the check box group
DataSource	The data source to use
DataTextField	A field in the data source to be displayed in the check box group
DataValueField	A field in the data source that specifies the value of each selectable item in the check box group
id	A unique id for the control
OnSelectedIndexChanged	The name of the function to be executed when one of the items changes select status
RepeatColumns	The number of columns to use when displaying the check box group. Default is "1"
RepeatDirection	Specifies whether the check box group should be repeated horizontally or vertically. Legal values are "Horizontal" and "Vertical". Default is Vertical
RepeatLayout	The layout of the check box group. Can be "Table" or "Flow". Default is Table
runat	Specifies that the control is a server control. Must be set to "server"
TextAlign	On which side of the check box the text should appear (right or left)

Example 1

In the following example we declare one CheckBoxList control in an .aspx file. Then we create an event handler for the SelectedIndexChanged event. The selectable list contains six check boxes. When a user checks one of the boxes, the page is immediately posted back to the server, and the Check_Clicked subroutine is executed. The subroutine loops through the control's Items collection and tests each item's Selected property. The selected items are then displayed in the Label control:

<script runat="server">
  Sub Check_Clicked(sender As Object, e As EventArgs)
    dim i
    mess.Text="<h3>Selected Item(s)</h3>"
    for i=0 to check1.Items.Count-1
      if check1.Items(i).Selected then
        mess.Text+=check1.Items(i).Text + "<br />"
      end if
    next
  End Sub
</script>

<html>
<body>
<form runat="server">
<asp:CheckBoxList id="check1" AutoPostBack="True"
TextAlign="Right" OnSelectedIndexChanged="Check_Clicked"
runat="server">

<asp:ListItem>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:CheckBoxList>
<br />
<br />
<asp:label id="mess" runat="server"/>
</form>
</body>
</html>

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