.NET Framework Class Library ScrollBars Enumeration Specifies the visibility and position of scroll bars in a Panel control. This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace:
System.Web.UI.WebControls
Assembly:
System.Web (in System.Web.dll)
Syntax
<FlagsAttribute> _
Public Enumeration ScrollBars
[FlagsAttribute]
public enum ScrollBars
[FlagsAttribute]
public enum class ScrollBars
[<FlagsAttribute>]
type ScrollBars
Members
| Member name | Description |
|---|
| None | Displays no scroll bars. | | Horizontal | Displays only a horizontal scroll bar. | | Vertical | Displays only a vertical scroll bar. | | Both | Displays both a horizontal and a vertical scroll bar. | | Auto | Displays, horizontal, vertical, or both scroll bars as necessary. Otherwise, no scroll bars are shown. |
Remarks
The ScrollBars enumeration represents the visibility and position of the scroll bars in a Panel control. The ScrollBars property uses these enumeration values to specify the type of scroll bars to display in a Panel control. The default value for the ScrollBars property is None, indicating that no scroll bars are shown. If you specify Auto for the ScrollBars property, scroll bars are automatically shown when the size of the content in a Panel control exceeds the size of the Panel control. For example, if a Panel control contains a table, and the panel is not wide enough to display all the rows in the table, a vertical scroll bar is shown. If the size of the table exceeds the height and width of the panel, both vertical and horizontal scroll bars are shown.
Examples
The following code example demonstrates how to declaratively set the ScrollBars property to Auto. The panel contains a table, the entire contents of which exceed the size of the panel. This causes both vertical and horizontal scroll bars to be automatically displayed when the panel is rendered. The user can then scroll to view all the data in the table.
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Private Sub Page_Load(ByVal sender As Object, _
ByVal e As System.EventArgs)
' Add more rows and columns to the table than can
' be displayed in the panel area.
' Scroll bars will be required to view all the data.
' Add rows and columns to the table.
Dim rowNum As Integer
For rowNum = 0 To 50
Dim tempRow As New TableRow
Dim cellNum As Integer
For cellNum = 0 To 10
Dim tempCell As New TableCell
tempCell.Text = _
String.Format("({0}, {1})", rowNum, cellNum)
tempRow.Cells.Add(tempCell)
Next
Table1.Rows.Add(tempRow)
Next
End Sub
</script>
<html >
<head id="Head2" runat="server">
<title>Panel Scrollbars - VB.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px"
BackColor="Aqua" ScrollBars="Auto">
<asp:Table ID="Table1" runat="Server"></asp:Table>
</asp:Panel>
</div>
</form>
</body>
</html>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void Page_Load(object sender, EventArgs e)
{
// Add more rows and columns to the table than can
// be displayed in the panel area.
// Scroll bars will be required to view all the data.
// Add rows and columns to the table.
for (int rowNum = 0; rowNum < 51; rowNum++)
{
TableRow tempRow = new TableRow();
for (int cellNum = 0; cellNum < 11; cellNum++)
{
TableCell tempCell = new TableCell();
tempCell.Text =
String.Format("({0}, {1})", rowNum, cellNum);
tempRow.Cells.Add(tempCell);
}
Table1.Rows.Add(tempRow);
}
}
</script>
<html >
<head id="Head2" runat="server">
<title>Panel Scrollbars - C# Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px"
BackColor="Aqua" ScrollBars="Auto">
<asp:Table ID="Table1" runat="Server"></asp:Table>
</asp:Panel>
</div>
</form>
</body>
</html>
The following code example demonstrates the ScrollBars enumeration values. A ListBox control is populated with the ScrollBars enumeration values. The scroll bars displayed in the panel change, based on the value the user selects from the list box.
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Private Sub Page_Load(ByVal sender As Object, _
ByVal e As System.EventArgs)
' Add more rows and columns to the table than can
' be displayed in the panel area.
' Scroll bars will be required to view all the data.
' Add rows and columns to the table.
Dim i As Integer
For i = 0 To 50
Dim tempRow As New TableRow
Dim j As Integer
For j = 0 To 10
Dim tempCell As New TableCell
tempCell.Text = "(" & i & "," & j & ")"
tempRow.Cells.Add(tempCell)
Next j
Table1.Rows.Add(tempRow)
Next i
End Sub
Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, _
ByVal e As EventArgs)
' Determine which list item was clicked.
' Display the selected scroll bars in the panel.
Select Case (ListBox1.SelectedIndex)
Case 0
Panel1.ScrollBars = ScrollBars.None
Case 1
Panel1.ScrollBars = ScrollBars.Horizontal
Case 2
Panel1.ScrollBars = ScrollBars.Vertical
Case 3
Panel1.ScrollBars = ScrollBars.Both
Case 4
Panel1.ScrollBars = ScrollBars.Auto
Case Else
Throw New Exception("Select a valid list item.")
End Select
End Sub
</script>
<html >
<head id="Head2" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<h4>Select the scrollbars to display in the panel.</h4>
<asp:ListBox ID="ListBox1" runat="Server"
Rows="5" AutoPostBack="True" SelectionMode="Single"
OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
<asp:ListItem>None</asp:ListItem>
<asp:ListItem>Horizontal</asp:ListItem>
<asp:ListItem>Vertical</asp:ListItem>
<asp:ListItem>Both</asp:ListItem>
<asp:ListItem>Auto</asp:ListItem>
</asp:ListBox>
<hr />
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px" BackColor="Aqua">
<asp:Table ID="Table1" runat="Server" />
</asp:Panel>
</div>
</form>
</body>
</html>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void Page_Load(object sender, EventArgs e)
{
// Add more rows and columns to the table than can
// be displayed in the panel area.
// Scroll bars will be required to view all the data.
// Add rows and columns to the table.
for (int rowNum = 0; rowNum < 51; rowNum++)
{
TableRow tempRow = new TableRow();
for (int cellNum = 0; cellNum < 11; cellNum++)
{
TableCell tempCell = new TableCell();
tempCell.Text =
String.Format("({0}, {1})", rowNum, cellNum);
tempRow.Cells.Add(tempCell);
}
Table1.Rows.Add(tempRow);
}
}
private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
// Determine which list item was clicked.
// Display the selected scroll bars in the panel.
switch (ListBox1.SelectedIndex)
{
case 0:
Panel1.ScrollBars = ScrollBars.None;
break;
case 1:
Panel1.ScrollBars = ScrollBars.Horizontal;
break;
case 2:
Panel1.ScrollBars = ScrollBars.Vertical;
break;
case 3:
Panel1.ScrollBars = ScrollBars.Both;
break;
case 4:
Panel1.ScrollBars = ScrollBars.Auto;
break;
default:
throw new Exception("Select a valid list item.");
}
}
</script>
<html >
<head id="Head2" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<h4>Select the scrollbars to display in the panel.</h4>
<asp:ListBox ID="ListBox1" runat="Server"
Rows="5" AutoPostBack="True"
SelectionMode="Single"
OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
<asp:ListItem>None</asp:ListItem>
<asp:ListItem>Horizontal</asp:ListItem>
<asp:ListItem>Vertical</asp:ListItem>
<asp:ListItem>Both</asp:ListItem>
<asp:ListItem>Auto</asp:ListItem>
</asp:ListBox>
<hr />
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px" BackColor="Aqua">
<asp:Table ID="Table1" runat="Server" />
</asp:Panel>
</div>
</form>
</body>
</html>
Version Information
.NET FrameworkSupported in: 4, 3.5, 3.0, 2.0
Platforms
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role not supported), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
See Also
|
Bibliothèque de classes .NET Framework ScrollBars, énumération Spécifie la visibilité et la position des barres de défilement dans un contrôle Panel. Cette énumération possède un attribut FlagsAttribute qui permet la combinaison d'opérations de bits de ses valeurs de membres.
Espace de noms :
System.Web.UI.WebControls
Assembly :
System.Web (dans System.Web.dll)
Syntaxe
<FlagsAttribute> _
Public Enumeration ScrollBars
[FlagsAttribute]
public enum ScrollBars
[FlagsAttribute]
public enum class ScrollBars
[<FlagsAttribute>]
type ScrollBars
Membres
| Nom de membre | Description |
|---|
| None | N'affiche aucune barre de défilement. | | Horizontal | Affiche uniquement une barre de défilement horizontale. | | Vertical | Affiche uniquement une barre de défilement verticale. | | Both | Affiche à la fois une barre de défilement horizontale et une barre de défilement verticale. | | Auto | Si nécessaire, les barres de défilement horizontales, verticales, ou les deux, sont affichées. Sinon, aucune barre de défilement n'est visible. |
Notes
L'énumération ScrollBars représente la visibilité et la position des barres de défilement dans un contrôle Panel. La propriété ScrollBars utilise ces valeurs d'énumération pour spécifier le type de barres de défilement à afficher dans un contrôle Panel. La valeur par défaut pour la propriété ScrollBars est None, elle indique qu'aucune barre de défilement n'est affichée. Si vous spécifiez Auto pour la propriété ScrollBars, les barres de défilement s'affichent automatiquement lorsque la taille du contenu d'un contrôle Panel dépasse celle du contrôle Panel lui-même. Par exemple, si un contrôle Panel contient un tableau et que le panneau n'est pas assez large pour afficher toutes les lignes du tableau, une barre de défilement verticale s'affiche. Si la taille du tableau dépasse la hauteur et la largeur du panneau, les barres de défilement verticale et horizontale s'affichent.
Exemples
L'exemple de code suivant montre comment affecter de manière déclarative la valeur Auto à la propriété ScrollBars. Le panneau contient un tableau dont le contenu entier dépasse sa taille. Par conséquent, des barres de défilement verticale et horizontale s'affichent automatiquement lorsque le panneau est rendu. L'utilisateur peut faire défiler les éléments pour afficher toutes les données du tableau.
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Private Sub Page_Load(ByVal sender As Object, _
ByVal e As System.EventArgs)
' Add more rows and columns to the table than can
' be displayed in the panel area.
' Scroll bars will be required to view all the data.
' Add rows and columns to the table.
Dim rowNum As Integer
For rowNum = 0 To 50
Dim tempRow As New TableRow
Dim cellNum As Integer
For cellNum = 0 To 10
Dim tempCell As New TableCell
tempCell.Text = _
String.Format("({0}, {1})", rowNum, cellNum)
tempRow.Cells.Add(tempCell)
Next
Table1.Rows.Add(tempRow)
Next
End Sub
</script>
<html >
<head id="Head2" runat="server">
<title>Panel Scrollbars - VB.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px"
BackColor="Aqua" ScrollBars="Auto">
<asp:Table ID="Table1" runat="Server"></asp:Table>
</asp:Panel>
</div>
</form>
</body>
</html>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void Page_Load(object sender, EventArgs e)
{
// Add more rows and columns to the table than can
// be displayed in the panel area.
// Scroll bars will be required to view all the data.
// Add rows and columns to the table.
for (int rowNum = 0; rowNum < 51; rowNum++)
{
TableRow tempRow = new TableRow();
for (int cellNum = 0; cellNum < 11; cellNum++)
{
TableCell tempCell = new TableCell();
tempCell.Text =
String.Format("({0}, {1})", rowNum, cellNum);
tempRow.Cells.Add(tempCell);
}
Table1.Rows.Add(tempRow);
}
}
</script>
<html >
<head id="Head2" runat="server">
<title>Panel Scrollbars - C# Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px"
BackColor="Aqua" ScrollBars="Auto">
<asp:Table ID="Table1" runat="Server"></asp:Table>
</asp:Panel>
</div>
</form>
</body>
</html>
L'exemple de code suivant illustre les valeurs d'énumération ScrollBars. Un contrôle ListBox est rempli avec les valeurs d'énumération ScrollBars. Les barres de défilement affichées dans le panneau changent en fonction de la valeur que l'utilisateur sélectionne dans la zone de liste.
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Private Sub Page_Load(ByVal sender As Object, _
ByVal e As System.EventArgs)
' Add more rows and columns to the table than can
' be displayed in the panel area.
' Scroll bars will be required to view all the data.
' Add rows and columns to the table.
Dim i As Integer
For i = 0 To 50
Dim tempRow As New TableRow
Dim j As Integer
For j = 0 To 10
Dim tempCell As New TableCell
tempCell.Text = "(" & i & "," & j & ")"
tempRow.Cells.Add(tempCell)
Next j
Table1.Rows.Add(tempRow)
Next i
End Sub
Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, _
ByVal e As EventArgs)
' Determine which list item was clicked.
' Display the selected scroll bars in the panel.
Select Case (ListBox1.SelectedIndex)
Case 0
Panel1.ScrollBars = ScrollBars.None
Case 1
Panel1.ScrollBars = ScrollBars.Horizontal
Case 2
Panel1.ScrollBars = ScrollBars.Vertical
Case 3
Panel1.ScrollBars = ScrollBars.Both
Case 4
Panel1.ScrollBars = ScrollBars.Auto
Case Else
Throw New Exception("Select a valid list item.")
End Select
End Sub
</script>
<html >
<head id="Head2" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<h4>Select the scrollbars to display in the panel.</h4>
<asp:ListBox ID="ListBox1" runat="Server"
Rows="5" AutoPostBack="True" SelectionMode="Single"
OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
<asp:ListItem>None</asp:ListItem>
<asp:ListItem>Horizontal</asp:ListItem>
<asp:ListItem>Vertical</asp:ListItem>
<asp:ListItem>Both</asp:ListItem>
<asp:ListItem>Auto</asp:ListItem>
</asp:ListBox>
<hr />
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px" BackColor="Aqua">
<asp:Table ID="Table1" runat="Server" />
</asp:Panel>
</div>
</form>
</body>
</html>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void Page_Load(object sender, EventArgs e)
{
// Add more rows and columns to the table than can
// be displayed in the panel area.
// Scroll bars will be required to view all the data.
// Add rows and columns to the table.
for (int rowNum = 0; rowNum < 51; rowNum++)
{
TableRow tempRow = new TableRow();
for (int cellNum = 0; cellNum < 11; cellNum++)
{
TableCell tempCell = new TableCell();
tempCell.Text =
String.Format("({0}, {1})", rowNum, cellNum);
tempRow.Cells.Add(tempCell);
}
Table1.Rows.Add(tempRow);
}
}
private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
// Determine which list item was clicked.
// Display the selected scroll bars in the panel.
switch (ListBox1.SelectedIndex)
{
case 0:
Panel1.ScrollBars = ScrollBars.None;
break;
case 1:
Panel1.ScrollBars = ScrollBars.Horizontal;
break;
case 2:
Panel1.ScrollBars = ScrollBars.Vertical;
break;
case 3:
Panel1.ScrollBars = ScrollBars.Both;
break;
case 4:
Panel1.ScrollBars = ScrollBars.Auto;
break;
default:
throw new Exception("Select a valid list item.");
}
}
</script>
<html >
<head id="Head2" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Panel.ScrollBars Property Example</h3>
<h4>Select the scrollbars to display in the panel.</h4>
<asp:ListBox ID="ListBox1" runat="Server"
Rows="5" AutoPostBack="True"
SelectionMode="Single"
OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
<asp:ListItem>None</asp:ListItem>
<asp:ListItem>Horizontal</asp:ListItem>
<asp:ListItem>Vertical</asp:ListItem>
<asp:ListItem>Both</asp:ListItem>
<asp:ListItem>Auto</asp:ListItem>
</asp:ListBox>
<hr />
<asp:Panel ID="Panel1" runat="Server"
Height="300px" Width="400px" BackColor="Aqua">
<asp:Table ID="Table1" runat="Server" />
</asp:Panel>
</div>
</form>
</body>
</html>
Informations de version
.NET FrameworkPris en charge dans : 4, 3.5, 3.0, 2.0
Plateformes
Windows 7, Windows Vista SP1 ou ultérieur, Windows XP SP3, Windows XP SP2 Édition x64, Windows Server 2008 (installation minimale non prise en charge), Windows Server 2008 R2 (installation minimale prise en charge avec SP1 ou version ultérieure), Windows Server 2003 SP2
Le .NET Framework ne prend pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.
Voir aussi
|