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ASP.NET Tutorial/ASP.net Controls/ListItem - История изменений
2026-04-29T23:46:20Z
История изменений этой страницы в вики
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http://nfex.ru/index.php?title=ASP.NET_Tutorial/ASP.net_Controls/ListItem&diff=3376&oldid=prev
в 15:30, 26 мая 2010
2010-05-26T15:30:57Z
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<td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td>
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http://nfex.ru/index.php?title=ASP.NET_Tutorial/ASP.net_Controls/ListItem&diff=3377&oldid=prev
Admin: 1 версия
2010-05-26T12:00:39Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Add asp:ListItem to asp:DropDownList==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="VB" Trace="true" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Show Control Tree</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:DropDownList<br />
id="DropDownList1"<br />
Runat="server"><br />
<asp:ListItem Text="Oranges" /><br />
<asp:ListItem Text="Apples" /><br />
</asp:DropDownList> <br />
<asp:Button <br />
id="Button1"<br />
Text="Submit"<br />
Runat="server" /><br />
<br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== All items and selected item in a selectable control==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="SelectableListControls" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head runat="server"><br />
<title>Untitled Page</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:ListBox runat="server" <br />
ID="Listbox1" <br />
SelectionMode="Multiple" <br />
Rows="5"><br />
<asp:ListItem Selected="true">Option 1</asp:ListItem><br />
<asp:ListItem>Option 2</asp:ListItem><br />
</asp:ListBox><br />
<br/><br/><br />
<asp:DropDownList runat="server" ID="DropdownList1"><br />
<asp:ListItem Selected="true">Option 1</asp:ListItem><br />
<asp:ListItem>Option 2</asp:ListItem><br />
</asp:DropDownList><br />
<br/><br/><br />
<asp:CheckBoxList runat="server" <br />
ID="CheckboxList1" <br />
RepeatColumns="3" ><br />
<asp:ListItem Selected="true">Option 1</asp:ListItem><br />
<asp:ListItem>Option 2</asp:ListItem><br />
</asp:CheckBoxList><br />
<br/><br />
<asp:RadioButtonList runat="server" <br />
ID="RadiobuttonList1"<br />
RepeatDirection="Horizontal" <br />
RepeatColumns="2"><br />
<asp:ListItem Selected="true">Option 1</asp:ListItem><br />
<asp:ListItem>Option 2</asp:ListItem><br />
</asp:RadioButtonList><br />
<asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click"/><br />
</div><br />
</form><br />
</body><br />
</html><br />
File: Default.aspx.cs<br />
using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Collections;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Web.UI.HtmlControls;<br />
public partial class SelectableListControls : System.Web.UI.Page<br />
{<br />
protected void Page_Load(object sender, EventArgs e)<br />
{<br />
if (!Page.IsPostBack)<br />
{<br />
for (int i = 3; i <= 5; i++)<br />
{<br />
Listbox1.Items.Add("Option " + i.ToString());<br />
DropdownList1.Items.Add("Option " + i.ToString());<br />
CheckboxList1.Items.Add("Option " + i.ToString());<br />
RadiobuttonList1.Items.Add("Option " + i.ToString());<br />
}<br />
}<br />
}<br />
protected void Button1_Click(object sender, System.EventArgs e)<br />
{<br />
Response.Write("<b>Selected items for Listbox1:</b><br/>");<br />
foreach (ListItem li in Listbox1.Items)<br />
{<br />
if (li.Selected) Response.Write("- " + li.Text + "<br/>");<br />
}<br />
Response.Write("<b>Selected item for DropdownList1:</b><br/>");<br />
Response.Write("- " + DropdownList1.SelectedItem.Text + "<br/>");<br />
Response.Write("<b>Selected items for CheckboxList1:</b><br/>");<br />
foreach (ListItem li in CheckboxList1.Items)<br />
{<br />
if (li.Selected) Response.Write("- " + li.Text + "<br/>");<br />
}<br />
Response.Write("<b>Selected item for RadiobuttonList1:</b><br/>");<br />
Response.Write("- " + RadiobuttonList1.SelectedItem.Text + "<br/>");<br />
}<br />
}</source><br />
<br />
<br />
<br />
== A simple BulletedList control==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" %><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>BulletedList Server Control</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<asp:BulletedList ID="Bulletedlist1" Runat="server"><br />
<asp:ListItem>United States</asp:ListItem><br />
<asp:ListItem>United Kingdom</asp:ListItem><br />
<asp:ListItem>Finland</asp:ListItem><br />
<asp:ListItem>Russia</asp:ListItem><br />
<asp:ListItem>Sweden</asp:ListItem><br />
<asp:ListItem>Estonia</asp:ListItem><br />
</asp:BulletedList><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Change style for ListItem==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ListControlAttributes" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head runat="server"><br />
<title>Untitled Page</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:Label ID="myLab" runat="server" /><br /><br />
<asp:DropDownList ID="myDrop" runat="server"><br />
<asp:ListItem>Red</asp:ListItem><br />
<asp:ListItem>Blue</asp:ListItem><br />
<asp:ListItem>Green</asp:ListItem> <br />
</asp:DropDownList><br />
<br />
</div><br />
</form><br />
</body><br />
</html><br />
File: Default.aspx.cs<br />
using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Collections;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Web.UI.HtmlControls;<br />
public partial class ListControlAttributes : System.Web.UI.Page<br />
{<br />
protected void Page_Load(object sender, EventArgs e)<br />
{<br />
myLab.Text = "Red text here";<br />
myLab.Attributes["style"] = "background-color:red;";<br />
myDrop.Items[0].Attributes["style"] = "background-color:red;";<br />
myDrop.Items[1].Attributes["style"] = "background-color:green;";<br />
myDrop.Items[2].Attributes["style"] = "background-color:blue;";<br />
myDrop.Attributes["style"] = "background-color:yellow;";<br />
myDrop.Items[1].Enabled = false;<br />
}<br />
}</source><br />
<br />
<br />
<br />
== Declaring List Items==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
The ListItem control supports the following five properties:<br />
Attributes: attributes of a list item.<br />
Enabled: disable or enable a list item.<br />
Selected: mark as selected.<br />
Text: text displayed by the list item.<br />
Value: specify a hidden value associated with the list item.<br />
<br />
<%@ Page Language="C#" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"<br />
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>Favorite Product</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:Label<br />
id="lblProducts"<br />
Text="Favorite Product:"<br />
AssociatedControlID="rblProducts"<br />
Runat="server" /><br />
<asp:RadioButtonList<br />
id="rblProducts"<br />
Runat="server"><br />
<asp:ListItem<br />
Text="The Remains of the Day"<br />
Value="product1" /><br />
<asp:ListItem<br />
Text="Star Wars"<br />
Value="product2" /><br />
<asp:ListItem<br />
Text="Pulp Fiction"<br />
Value="product3" /><br />
</asp:RadioButtonList><br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Disabling certain ListItems from a collection (C#)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" %><br />
<script runat="server"><br />
protected void Dropdownlist1_SelectedIndexChanged(object sender, EventArgs e)<br />
{<br />
Response.Write("You selected item number " + DropDownList1.SelectedValue + "<br>");<br />
Response.Write("You didn"t select item number " + DropDownList1.Items[1].Value);<br />
}<br />
</script><br />
<html><br />
<head id="Head1" runat="server"><br />
<title>DropDownList Server Control</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<asp:DropDownList ID="DropDownList1" Runat="server" AutoPostBack="True" OnSelectedIndexChanged="Dropdownlist1_SelectedIndexChanged"><br />
<asp:ListItem Value="1">First Choice</asp:ListItem><br />
<asp:ListItem Value="2" Enabled="False">Second Choice</asp:ListItem><br />
<asp:ListItem Value="3">Third Choice</asp:ListItem><br />
</asp:DropDownList><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Disabling certain ListItems from a collection (VB)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ page language="VB" %><br />
<script runat="server"><br />
Protected Sub Dropdownlist1_SelectedIndexChanged(ByVal sender As Object, _<br />
ByVal e As System.EventArgs)<br />
Response.Write("You selected item number " & _<br />
DropDownList1.SelectedValue & "<br>")<br />
Response.Write("You didn"t select item number " & _<br />
DropDownList1.Items(1).Value)<br />
End Sub<br />
</script><br />
<html><br />
<head id="Head1" runat="server"><br />
<title>DropDownList Server Control</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<asp:DropDownList ID="Dropdownlist1" Runat="server" AutoPostBack="True" <br />
OnSelectedIndexChanged="Dropdownlist1_SelectedIndexChanged"><br />
<asp:ListItem Value="1">First Choice</asp:ListItem><br />
<asp:ListItem Value="2" Enabled="False">Second Choice</asp:ListItem><br />
<asp:ListItem Value="3">Third Choice</asp:ListItem><br />
</asp:DropDownList><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Set style for label==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ListControlProgrammatic" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head runat="server"><br />
<title>Programmatic Iteration of ListControl</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div id="container"> <br />
<h1>Choose multiple colors (use ctrl or shift): </h1> <br />
<asp:ListBox ID="myList" runat="server" <br />
SelectionMode="Multiple" Rows="6"> <br />
<asp:ListItem Value="#FF0000">Red</asp:ListItem><br />
<asp:ListItem Value="#FF00FF">Magenta</asp:ListItem><br />
<asp:ListItem Value="#FFFF00">Yellow</asp:ListItem><br />
<asp:ListItem Value="#00FF00">Green</asp:ListItem><br />
<asp:ListItem Value="#00FFFF">Cyan</asp:ListItem><br />
<asp:ListItem Value="#0000FF">Blue</asp:ListItem><br />
</asp:ListBox><br />
<asp:Button ID="myBtn" runat="server" Text="Submit"/><br />
<asp:Label ID="labResult" runat="server" Width="300" Height="100" /><br />
</div><br />
</form><br />
</body><br />
</html><br />
File: Default.aspx.cs<br />
using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Collections;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Web.UI.HtmlControls;<br />
public partial class ListControlProgrammatic : System.Web.UI.Page<br />
{<br />
protected void Page_Load(object sender, EventArgs e)<br />
{<br />
if (IsPostBack)<br />
{<br />
labResult.Text = "Colors chosen: <br/>";<br />
foreach (ListItem li in myList.Items)<br />
{<br />
if (li.Selected)<br />
{<br />
labResult.Text += "<span style="color:";<br />
labResult.Text += li.Value + "">" + li.Text;<br />
labResult.Text += "</span><br/>";<br />
}<br />
}<br />
}<br />
}<br />
}</source><br />
<br />
<br />
<br />
== Using the LinkButton value for the DisplayMode attribute (C#)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" %><br />
<script runat="server"><br />
protected void BulletedList1_Click(object sender,<br />
System.Web.UI.WebControls.BulletedListEventArgs e)<br />
{ <br />
Label1.Text = "The index of item you selected: " + e.Index +<br />
"<br>The value of the item selected: " + <br />
BulletedList1.Items[e.Index].Text;<br />
}<br />
</script><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>BulletedList Server Control</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<asp:BulletedList ID="BulletedList1" Runat="server" <br />
OnClick="BulletedList1_Click" DisplayMode="LinkButton"><br />
<asp:ListItem>United States</asp:ListItem><br />
<asp:ListItem>United Kingdom</asp:ListItem><br />
<asp:ListItem>Finland</asp:ListItem><br />
</asp:BulletedList><br />
<asp:Label ID="Label1" Runat="server"><br />
</asp:Label><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Using the LinkButton value for the DisplayMode attribute (VB)==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="VB"%><br />
<script runat="server"><br />
Protected Sub BulletedList1_Click(ByVal sender As Object, _<br />
ByVal e As System.Web.UI.WebControls.BulletedListEventArgs)<br />
<br />
Label1.Text = "The index of item you selected: " & e.Index & _<br />
"<br>The value of the item selected: " & _<br />
BulletedList1.Items(e.Index).Text<br />
End Sub<br />
</script><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head id="Head1" runat="server"><br />
<title>BulletedList Server Control</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<asp:BulletedList ID="BulletedList1" Runat="server" <br />
OnClick="BulletedList1_Click" DisplayMode="LinkButton"><br />
<asp:ListItem>United States</asp:ListItem><br />
<asp:ListItem>United Kingdom</asp:ListItem><br />
<asp:ListItem>Finland</asp:ListItem><br />
</asp:BulletedList><br />
<asp:Label ID="Label1" Runat="server"><br />
</asp:Label><br />
</form><br />
</body><br />
</html></source></div>
Admin