HtmlSelect.ServerChange 이벤트

참조

정의

네임스페이스:: System.Web.UI.HtmlControls

어셈블리:: System.Web.dll

중요

일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.

서버에 게시되는 사이 HtmlSelect 컨트롤에서 선택된 항목이 변경되면 발생합니다.

public:
 event EventHandler ^ ServerChange;

public event EventHandler ServerChange;

member this.ServerChange : EventHandler

Public Custom Event ServerChange As EventHandler

이벤트 유형

EventHandler

예제

다음 코드 예제를 지정 하 고 선언적으로 이벤트 처리기를 코딩 하는 방법을 보여 줍니다는 이벤트에 HtmlSelect 대 한 ServerChange 컨트롤입니다. 이벤트 처리기는 선택한 항목이 서로 호환되는지 여부를 결정합니다.

<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    void Button_Click (Object sender, EventArgs e)
    {
        Label1.Text = "You selected:";

        for (int i=0; i<=Select1.Items.Count - 1; i++)
        {
           if (Select1.Items[i].Selected)
               Label1.Text += "<br />    -" + Select1.Items[i].Text;      
        }

    }

    void Server_Change (Object sender, EventArgs e)
    {
        int Count = 0;

        for (int i=0; i<=Select1.Items.Count - 1; i++)
        {
           if (Select1.Items[i].Selected)
               Count++;      
        }

        if ((Count > 1) && (Select1.Items[0].Selected))
            Label2.Text = "Hey! You can't select 'All' with another selection!!";
        else
            Label2.Text = "";
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title> HtmlSelect Example </title>
</head>

<body>

   <form id="form1" runat="server">

      <h3> HtmlSelect Example </h3>

      Select items from the list: <br /><br />

      <select id="Select1" 
              multiple="true"
              onserverchange="Server_Change"
              runat="server">

         <option value="All"> All </option>
         <option value="1" selected="selected"> Item 1 </option>
         <option value="2"> Item 2 </option>
         <option value="3"> Item 3 </option>
         <option value="4"> Item 4 </option>
         <option value="5"> Item 5 </option>
         <option value="6"> Item 6 </option>

      </select>

      <br /><br />

      <button id="Button1"
              onserverclick="Button_Click"
              runat="server">

         Submit

      </button>

      <br /><br />

      <asp:Label id="Label1"
           runat="server"/>

      <br />

      <asp:Label id="Label2"
           runat="server"/>

   </form>

</body>

</html>

<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Sub Button_Click (sender As Object, e As EventArgs)
        Dim i As Integer

        Label1.Text = "You selected:"
        For i = 0 to Select1.Items.Count - 1
           If Select1.Items(i).Selected Then
               Label1.Text = Label1.Text & "<br />    -" & Select1.Items(i).Text
           End If         
        Next
    End Sub

    Sub Server_Change (sender As Object, e As EventArgs)
        Dim i As Integer
        Dim Count As Integer = 0

        For i = 0 to Select1.Items.Count - 1
            If Select1.Items(i).Selected Then
                Count = Count + 1
            End If         
        Next

        If Count > 1 And Select1.Items(0).Selected Then
            Label2.Text = "Hey! You can't select 'All' with another selection!!"
        Else
            Label2.Text = ""
        End If
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title> HtmlSelect Example </title>
</head>
<body>
<form id="form1" runat="server">
   <div>

      <h3> HtmlSelect Example </h3>

      Select items from the list: <br /><br />

      <select id="Select1" 
              multiple="true"
              onserverchange="Server_Change"
              runat="server">

         <option value="All"> All </option>
         <option value="1" selected="selected"> Item 1 </option>
         <option value="2"> Item 2 </option>
         <option value="3"> Item 3 </option>
         <option value="4"> Item 4 </option>
         <option value="5"> Item 5 </option>
         <option value="6"> Item 6 </option>

      </select>

      <br /><br />

      <button id="Button1"
              onserverclick="Button_Click"
              runat="server">

         Submit

      </button>

      <br /><br />

      <asp:Label id="Label1"
           runat="server"/>

      <br />

      <asp:Label id="Label2" runat="server"/>

   </div>
</form>
</body>
</html>

다음 코드 예제를 지정 하 고 제어의 이벤트에 대 한 프로그래밍 방식으로 이벤트 처리기를 코딩 하는 ServerChange 방법을 보여 줍니다 HtmlSelect . 이벤트 처리기는 선택한 항목이 서로 호환되는지 여부를 결정합니다.


<%@ 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">
    void Button_Click (Object sender, EventArgs e)
    {
        // Display the selected items.
        Label1.Text = "You selected:";

        for (int i=0; i<=Select1.Items.Count - 1; i++)
        {
            if (Select1.Items[i].Selected)
                Label1.Text += "<br />    -" + Select1.Items[i].Text;      
        }
    }

    void Server_Change(Object sender, EventArgs e)
    {
        // The ServerChange event is commonly used for data validation.
        // This method will display a warning if the "All" option is  
        // selected in combination with another item in the list.
        int Count = 0;

        // Determine the number of selected items in the list.
        for (int i=0; i<=Select1.Items.Count - 1; i++)
        {
            if (Select1.Items[i].Selected)
                Count++;      
        }

        // Display an error message if more than one item is selected with
        // the "All" item selected.
        if ((Count > 1) && (Select1.Items[0].Selected))
            Label2.Text = "Hey! You can't select 'All' with another selection!!";
        else
            Label2.Text = "";
    }

    void Page_Load(Object sender, EventArgs e)
    {
        // Create an EventHandler delegate for the method you want to
        // handle the event, and then add it to the list of methods
        // called when the event is raised.
        Select1.ServerChange += new System.EventHandler(this.Server_Change);
        Button1.ServerClick += new System.EventHandler(this.Button_Click);
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title> HtmlSelect Server Change Example </title>
</head>
<body>
<form id="form1" runat="server">
   <div>

      <h3> HtmlSelect Server Change Example </h3>

      Select items from the list: <br /><br />

      <select id="Select1" 
              multiple="true"
              runat="server">

         <option value="All"> All </option>
         <option value="1" selected="selected"> Item 1 </option>
         <option value="2"> Item 2 </option>
         <option value="3"> Item 3 </option>
         <option value="4"> Item 4 </option>
         <option value="5"> Item 5 </option>
         <option value="6"> Item 6 </option>

      </select>

      <br /><br />

      <button id="Button1"
              runat="server">

         Submit

      </button>

      <br /><br />

      <asp:Label id="Label1"
           runat="server"/>

      <br />

      <asp:Label id="Label2"
           runat="server"/>

   </div>
</form>
</body>
</html>


<%@ 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">

    Sub Button_Click (sender As Object, e As EventArgs)
        ' Display the selected items.
        Label1.Text = "You selected:"

        Dim i As Integer

        For i=0 To Select1.Items.Count - 1
            If Select1.Items(i).Selected Then
                Label1.Text &= "<br />    -" & Select1.Items(i).Text
            End If      
        Next
    End Sub

    Sub Server_Change(sender As Object, e As EventArgs)
        ' The ServerChange event is commonly used for data validation.
        ' This method will display a warning if the "All" option is 
        ' selected in combination with another item in the list.
        Dim Count As Integer = 0
        Dim i As Integer

        ' Determine the number of selected items in the list.
        For i=0 To Select1.Items.Count - 1
            If Select1.Items(i).Selected Then
                Count = Count + 1      
            End If
        Next

        ' Display an error message if more than one item is selected with
        ' the "All" item selected.
        If ((Count > 1) And (Select1.Items(0).Selected)) Then
            Label2.Text = "Hey! You can't select 'All' with another selection!!"
        Else
            Label2.Text = ""
        End If
    End Sub

    Sub Page_Load(sender As Object, e As EventArgs)
        ' Create an EventHandler delegate for the method you want to 
        ' handle the event, and then add it to the list of methods
        ' called when the event is raised.
        AddHandler Select1.ServerChange, AddressOf Server_Change
        AddHandler Button1.ServerClick, AddressOf Button_Click
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title> HtmlSelect ServerChange Example </title>
</head>
<body>
<form id="form1" runat="server">
   <div>

      <h3> HtmlSelect ServerChange Example </h3>

      Select items from the list: <br /><br />

      <select id="Select1" 
              multiple="true"
              runat="server">

         <option value="All"> All </option>
         <option value="1" selected="selected"> Item 1 </option>
         <option value="2"> Item 2 </option>
         <option value="3"> Item 3 </option>
         <option value="4"> Item 4 </option>
         <option value="5"> Item 5 </option>
         <option value="6"> Item 6 </option>

      </select>

      <br /><br />

      <button id="Button1"
              runat="server">

         Submit

      </button>

      <br /><br />

      <asp:Label id="Label1"
           runat="server"/>

      <br />

      <asp:Label id="Label2"
           runat="server"/>

   </div>
</form>
</body>
</html>

설명

이벤트는 ServerChange 컨트롤에서 선택한 항목 HtmlSelect 이 서버에 대한 게시물 간에 변경될 때 발생합니다.

참고

컨트롤의 뷰 상태에 사용할 수 있어야 합니다.는 ServerChange 이벤트가 올바르게 작동 하도록 합니다.

이벤트를 처리 하는 방법에 대 한 자세한 내용은 참조 하세요. 이벤트 처리 및 발생합니다.

적용 대상

다음을 통해 공유

HtmlSelect.ServerChange 이벤트

정의

이벤트 유형

예제

설명

적용 대상

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