ASP.Net/Asp Control/ListBox

Материал из .Net Framework эксперт
Версия от 14:52, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
(разн.) ← Предыдущая | Текущая версия (разн.) | Следующая → (разн.)
Перейти к: навигация, поиск

Add ListItem to ListBox

   <source lang="csharp">

<form runat="server"> <script language="C#" runat="server"> protected void Page_Load(object o, EventArgs e) {

   if(!IsPostBack) {
       ListItem item;
       item = new ListItem("A");
       languageListBox.Items.Add(item);
       item = new ListItem("B");
       languageListBox.Items.Add(item);
       item = new ListItem("C");
       languageListBox.Items.Add(item);
       languageListBox.Rows = 3;
   }

} protected void ListBoxSelectionChanged(object o, EventArgs e) {

   bool valueSet = false;
   foreach(ListItem item in languageListBox.Items) {
       if (item.Selected) {
           if(valueSet) {
               favoriteLanguage.Text += ", " + item.Text;
           }
           else {
               favoriteLanguage.Text = item.Text;
               valueSet = true;
           }
       }
   }

} </script> <asp:ListBox

   id="languageListBox"
   runat="server" 
   SelectionMode="multiple" 
   OnSelectedIndexChanged="ListBoxSelectionChanged" />
Favorite Language: <asp:label runat="server" id="favoriteLanguage" style="color:blue" Text="Not Set" />

<asp:button runat="server" Text="Submit"/> </form>

</source>
   
  


Allowing Multiple Selections in a ListBox Control (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <HTML> <HEAD> <TITLE>Allowing Multiple Selections in a ListBox Control</TITLE> </HEAD> <form runat="server">

Select a Color:


<asp:listbox id="lb1" runat="server" selectionmode="multiple" rows=4>

   <asp:listitem value="Bu">Blue</asp:listitem>
   <asp:listitem value="Re">Red</asp:listitem>
   <asp:listitem value="Gr">Green</asp:listitem>
   <asp:listitem value="Pu" Selected>Purple</asp:listitem>
   <asp:listitem value="Ba">Black</asp:listitem>
   <asp:listitem value="Go" text="Gold"/>

</asp:listbox> </form> </BODY> </HTML>

      </source>
   
  


asp:listbox: On selected index changed

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <script runat=server> Sub lb1_Changed(Sender As Object, E As EventArgs)

   lb1.BackColor = System.Drawing.Color.FromName(lb1.SelectedItem.Text)

End Sub </SCRIPT> <HTML> <HEAD> <TITLE>Writing Code that Fires When the Selection Changes in a ListBox Control</TITLE> </HEAD> <form runat="server">

Select a Color:


<asp:listbox id="lb1" runat="server" autopostback="True" onselectedindexchanged="lb1_Changed" rows=3>

   <asp:listitem value="Bu">Blue</asp:listitem>
   <asp:listitem value="Re">Red</asp:listitem>
   <asp:listitem value="Gr">Green</asp:listitem>
   <asp:listitem value="Pu" >Purple</asp:listitem>
   <asp:listitem value="Ba">Black</asp:listitem>

</asp:listbox> </form> </BODY> </HTML>

      </source>
   
  


Change background color for asp:listbox (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <script runat=server> Sub lb1_Changed(Sender As Object, E As EventArgs)

   lb1.BackColor = System.Drawing.Color.FromName(lb1.SelectedItem.Text)

End Sub </SCRIPT> <HTML> <HEAD> <TITLE>Writing Code that Fires When the Selection Changes in a ListBox Control</TITLE> </HEAD> <form runat="server">

Select a Color:


<asp:listbox id="lb1" runat="server" autopostback="True" onselectedindexchanged="lb1_Changed" rows=3>

   <asp:listitem value="Bu">Blue</asp:listitem>
   <asp:listitem value="Re">Red</asp:listitem>
   <asp:listitem value="Gr">Green</asp:listitem>
   <asp:listitem value="Pu" >Purple</asp:listitem>
   <asp:listitem value="Ba">Black</asp:listitem>

</asp:listbox> </form> </BODY> </HTML>

      </source>
   
  


Get selected index from asp:listbox (VB.net)

   <source lang="csharp">

<script runat="server" language="vb">

   Sub Page_Load()
   Dim msg As String = "You have selected: 
" If list1.Items(0).Selected Then msg = msg & list1.Items(0).Text & "
" If list1.Items(1).Selected Then msg = msg & list1.Items(1).Text & "
" If list1.Items(2).Selected Then msg = msg & list1.Items(2).Text & "
" Message.Text = msg End Sub</script>

<html>

 <head>
   <title>Drop Down List Example</title>
 </head>
 <body>
   <asp:label id="Message" runat="server"/> 
   
<form runat="server"> Which city do you wish to look at hotels for?

<asp:listbox id="list1" runat="server" selectionmode="multiple"> <asp:listitem>Madrid</asp:listitem> <asp:listitem>Oslo</asp:listitem> <asp:listitem>Lisbon</asp:listitem> </asp:listbox>



<input type="Submit"> </form> </body>

</html>

      </source>
   
  


Get selected index, text and value from asp:listbox (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <script runat=server> Sub SubmitBtn_Click(Sender As Object, E As EventArgs)

   lblDataSelected.Text = "Selected Text: " _
       & lb1.SelectedItem.Text & "
Selected Value: " _ & lb1.SelectedItem.Value & "
Selected Index: " _ & lb1.SelectedIndex

End Sub </SCRIPT> <HTML> <HEAD> <TITLE>Creating a Basic ListBox Control</TITLE> </HEAD> <form runat="server">

<asp:label id="lblDataSelected" runat="server"/>

<asp:listbox id="lb1" runat="server" rows=3>

   <asp:listitem value="Bu">Blue</asp:listitem>
   <asp:listitem value="Re">Red</asp:listitem>
   <asp:listitem value="Gr">Green</asp:listitem>
   <asp:listitem value="Pu" Selected>Purple</asp:listitem>
   <asp:listitem value="Ba">Black</asp:listitem>
   <asp:listitem value="Go" text="Gold"/>

</asp:listbox>

<asp:button id="butOK" text="OK" type="Submit" onclick="SubmitBtn_Click" runat="server"/> </form> </BODY> </HTML>

      </source>
   
  


Get selected item from ListBox (C#)

   <source lang="csharp">

<%@ Page Language="C#" %> <script runat="server">

   void Page_Load()
     {
     string msgCitiesList = "";
   
     if (Page.IsPostBack == true)
   
       if (list1.Items[0].Selected == true)
       {
         msgCitiesList = msgCitiesList + list1.Items[0].Text + "
"; } if (list1.Items[1].Selected) { msgCitiesList = msgCitiesList + list1.Items[1].Text + "
"; } if (list1.Items[2].Selected) { msgCitiesList = msgCitiesList + list1.Items[2].Text + "
"; } if (msgCitiesList != "") { Message.Text = "You have selected:
" + msgCitiesList; } else { Message.Text = ""; } }

</script> <html> <head>

   <title>List Box Example</title>

</head> <body>

   <asp:Label id="Message" runat="server"></asp:Label>
   
Which city do you wish to look at hotels for?
<form runat="server"> <asp:listbox id="list1" runat="server" selectionmode="multiple"> <asp:listitem>A</asp:listitem> <asp:listitem>B</asp:listitem> <asp:listitem>C</asp:listitem> </asp:listbox>
<input type="submit" value="Submit Query" /> </form>

</body> </html>

      </source>
   
  


Set static value for asp:listbox (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <HTML> <HEAD> <TITLE>Creating a Basic ListBox Control</TITLE> </HEAD> <form runat="server">

Select a Color:


<asp:listbox id="lb1" runat="server" rows=3>

   <asp:listitem value="Bu">Blue</asp:listitem>
   <asp:listitem value="Re">Red</asp:listitem>
   <asp:listitem value="Gr">Green</asp:listitem>
   <asp:listitem value="Pu" Selected>Purple</asp:listitem>
   <asp:listitem value="Ba">Black</asp:listitem>
   <asp:listitem value="Go" text="Gold"/>

</asp:listbox> </form> </BODY> </HTML>

      </source>
   
  


Using the ListBox to select list items.

   <source lang="csharp">

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <script runat="server">

   protected void btnAdd_Click(object sender, EventArgs e)
   {
       ListItem item = lstAllProducts.SelectedItem;
       if (item != null)
       {
           lstAllProducts.Items.Remove(item);
           lstFavoriteProducts.ClearSelection();
           lstFavoriteProducts.Items.Add(item);
       }
   }
   protected void btnRemove_Click(object sender, EventArgs e)
   {
       ListItem item = lstFavoriteProducts.SelectedItem;
       if (item != null)
       {
           lstFavoriteProducts.Items.Remove(item);
           lstAllProducts.ClearSelection();
           lstAllProducts.Items.Add(item);
       }
   }
   protected void btnSubmit_Click(object sender, EventArgs e)
   {
       foreach (ListItem item in lstFavoriteProducts.Items)
lblResults.Text += "
  • " + item.Text; } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <body> <form id="form1" runat="server"> <asp:ListBox id="lstAllProducts" DataSourceID="srcProducts" DataTextField="Title" DataValueField="Id" Runat="server" /> <asp:Button id="btnAdd" Text=">" ToolTip="Add List Item" Runat="server" OnClick="btnAdd_Click" />
    <asp:Button id="btnRemove" Text="<" ToolTip="Remove List Item" Runat="server" OnClick="btnRemove_Click" /> </div> <asp:ListBox id="lstFavoriteProducts" Runat="server" /> </div> <asp:Button id="btnSubmit" Text="Submit Form" Runat="server" OnClick="btnSubmit_Click" /> </p> <asp:Label id="lblResults" EnableViewState="false" Runat="server" /> <asp:SqlDataSource id="srcProducts" SelectCommand="SELECT Id, Title FROM Products" ConnectionString="<%$ ConnectionStrings:Products %>" Runat="server" /> </form> </body> </html> File: Web.config <configuration> <connectionStrings> <add name="Products" connectionString="Data Source=.\SQLEXPRESS; AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" /> </connectionStrings> </configuration> </source>