HtmlSelect.Name Vlastnost
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Získá nebo nastaví jedinečný identifikátor název přidružený k ovládacímu HtmlSelect prvku.
public:
property System::String ^ Name { System::String ^ get(); void set(System::String ^ value); };public string Name { get; set; }member this.Name : string with get, setPublic Property Name As StringHodnota vlastnosti
Jedinečný název identifikátoru přidružený k ovládacímu HtmlSelect prvku.
Příklady
Následující příklad kódu ukazuje, jak použít Name vlastnost HtmlSelect ovládacího prvku k výběru konkrétní položky v Items seznamu.
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server" >
void Page_Load(Object sender, EventArgs e)
{
// Bind a data source to the Repeater control.
Repeater1.DataSource = CreateRepeaterSource();
Repeater1.DataBind();
}
void Item_Bound(Object sender, RepeaterItemEventArgs e)
{
// Each item in the Repeater control contains an HtmlSelect
// control. This method binds a data source to the HtmlSelect
// control as each item in the Repeater control is being
// bound to data.
// The ItemDataBound event is raised when data is bound to an
// item in the Repeater control. Items can include the Header,
// Footer, and so on. Use the following logic only if the item
// being bound is an Item or AlternatingItem.
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
// Bind a data source to the HtmlSelect control.
HtmlSelect selectControl =
(HtmlSelect)e.Item.FindControl("Select1");
selectControl.DataSource = CreateHtmlSelectSource();
selectControl.DataBind();
// The runtime automatically generates a unique identifier
// for each control embedded in a list control, such as the
// Repeater. The Name property of the HtmlSelect control
// contains this unique identifier and is commonly used
// to identify a specific control.
// Select the last item in the HtmlSelect control if the Name
// property contains the value "Repeater1:_ctl3:Select1".
if(selectControl.Name == "Repeater1:_ctl3:Select1")
{
selectControl.SelectedIndex = selectControl.Items.Count - 1;
}
}
}
DataView CreateHtmlSelectSource()
{
// Create a DataTable that contains sample data for the
// HtmlSelect controls.
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("Text", typeof(String)));
dt.Columns.Add(new DataColumn("Value", typeof(String)));
// Populate the DataTable with sample values.
for (int i = 0; i < 5; i++)
{
dr = dt.NewRow();
dr[0] = "Item " + i.ToString();
dr[1] = i.ToString();
dt.Rows.Add(dr);
}
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
return dv;
}
DataView CreateRepeaterSource()
{
// Create a DataTable that contains sample data for the
// Repeater control.
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("Category", typeof(String)));
// Populate the DataTable with sample values.
for (int i = 0; i < 5; i++)
{
dr = dt.NewRow();
dr[0] = "Category " + i.ToString();
dt.Rows.Add(dr);
}
// Create a DataView from the DataTable.
DataView dv = new DataView(dt);
return dv;
}
</script>
<head runat="server">
<title> HtmlSelect Name Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3> HtmlSelect Name Example </h3>
Notice that Category 3 has a different item selected by default. <br />
<asp:Repeater id="Repeater1"
OnItemDataBound="Item_Bound"
runat="server">
<ItemTemplate>
<h4><%# DataBinder.Eval(Container.DataItem, "Category") %></h4>
Select Item:
<br />
<select id="Select1"
datatextfield="Text"
datavaluefield="Value"
runat="server"/>
<br /><br />
<hr />
</ItemTemplate>
</asp:Repeater>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server" >
Sub Page_Load(sender as Object, e As EventArgs)
' Bind a data source to the Repeater control.
Repeater1.DataSource = CreateRepeaterSource()
Repeater1.DataBind()
End Sub
Sub Item_Bound(sender As Object, e As RepeaterItemEventArgs)
' Each item in the Repeater control contains an HtmlSelect
' control. This method binds a data source to the HtmlSelect
' control as each item in the Repeater control is being
' bound to data.
' The ItemDataBound event is raised when data is bound to an
' item in the Repeater control. Items can include the Header,
' Footer, and so on. Use the following logic only if the item
' being bound is an Item or AlternatingItem.
If (e.Item.ItemType = ListItemType.Item) Or _
(e.Item.ItemType = ListItemType.AlternatingItem) Then
' Bind a data source to the HtmlSelect control.
Dim selectControl As HtmlSelect = _
CType(e.Item.FindControl("Select1"), HtmlSelect)
selectControl.DataSource = CreateHtmlSelectSource()
selectControl.DataBind()
' The runtime automatically generates a unique identifier
' for each control embedded in a list control, such as the
' Repeater. The Name property of the HtmlSelect control
' contains this unique identifier and is commonly used
' to identify a specific control.
' Select the last item in the HtmlSelect control if the Name
' property contains the value "Repeater1:_ctl3:Select1".
If selectControl.Name = "Repeater1:_ctl3:Select1" Then
selectControl.SelectedIndex = selectControl.Items.Count - 1
End If
End If
End Sub
Function CreateHtmlSelectSource() As DataView
' Create a DataTable that contains sample data for the
' HtmlSelect controls.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("Text", GetType(String)))
dt.Columns.Add(New DataColumn("Value", GetType(String)))
' Populate the DataTable with sample values.
Dim i As Integer
For i = 0 To 4
dr = dt.NewRow()
dr(0) = "Item " & i.ToString()
dr(1) = i.ToString()
dt.Rows.Add(dr)
Next i
' Create a DataView from the DataTable.
Dim dv As DataView = New DataView(dt)
Return dv
End Function
Function CreateRepeaterSource() As DataView
' Create a DataTable that contains sample data for the
' Repeater control.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
dt.Columns.Add(new DataColumn("Category", GetType(String)))
' Populate the DataTable with sample values.
Dim i As Integer
For i = 0 To 4
dr = dt.NewRow()
dr(0) = "Category " & i.ToString()
dt.Rows.Add(dr)
Next i
' Create a DataView from the DataTable.
Dim dv As DataView = new DataView(dt)
return dv
End Function
</script>
<head runat="server">
<title> HtmlSelect Name Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3> HtmlSelect Name Example </h3>
Notice that Category 3 has a different item selected by default. <br />
<asp:Repeater id="Repeater1"
OnItemDataBound="Item_Bound"
runat="server">
<ItemTemplate>
<h4><%# DataBinder.Eval(Container.DataItem, "Category") %></h4>
Select Item:
<br />
<select id="Select1"
datatextfield="Text"
datavaluefield="Value"
runat="server"/>
<br /><br />
<hr />
</ItemTemplate>
</asp:Repeater>
</form>
</body>
</html>
Poznámky
Name Pomocí vlastnosti určete jedinečný název identifikátoru HtmlSelect ovládacího prvku. V této implementaci get vrátí přístupová objekt hodnotu Control.UniqueID vlastnosti. Přístupová objekt set však nepřiřazuje k této vlastnosti hodnotu.
Poznámka
Přístupové set objekty nepřiřazují k této vlastnosti hodnotu, protože Name vlastnost musí mít stejnou hodnotu jako Control.UniqueID vlastnost, HtmlSelect aby ovládací prvek fungoval správně.