ASP.Net/Asp Control/Button — различия между версиями

Версия 15:30, 26 мая 2010

Содержание

1 Add action listener to a server Button (VB.net)
2 Add action listener to asp Button by delegate (C#)
3 asp:button: command name and arguments (VB.net)
4 asp:button event to change the label text (VB.net)
5 asp button on client click (C#)
6 asp button postbackurl (C#)
7 Button action Command and Parameter (VB.net)
8 Button counter: click and change button label (C#)
9 Button event Handler (C#)
10 CausesValidation="False"
11 Event driven page (VB.net)
12 Event in code behind file (VB.net)
13 OnClientClick event
14 onmouseover and onmouseout events
15 Read input and do the calculation in Button action listener (C#)
16 Set Button text (VB.net)

Add action listener to a server Button (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    lblMessage.Text = "Press a button!"
End Sub
Sub SubmitBtn1_Click(Sender As Object, E As EventArgs)
    lblMessage.Text = "You pressed the alone button."
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Button Controls Sample Page</TITLE>
</HEAD>
<BODY>
<form runat="server">
<Font Face="Tahoma" Size="+1">
<asp:Label 
    id="lblMessage" 
    Text="Press a button!"
    runat="server"
/>
<BR><BR>
<asp:Button 
    id="butAlone"
    text="Alone Button"
    OnClick="SubmitBtn1_Click" 
    runat="server"
/>
<BR><BR>
</Font>
</Form>
</BODY>
</HTML>

Add action listener to asp Button by delegate (C#)

<%@ page language="C#" %>
<script runat="server">
void Page_Load (object sender, System.EventArgs e) {    
        
        this.Button1.Click += delegate(object dlgSender, EventArgs dlgE) {
            Label1.Text = "you clicked the button!";
        };    
    }
    </script>
<html>
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form runat="server">
        <asp:button id="Button1" runat="server" text="Button" />
        <br />
        <br />
        <asp:label id="Label1" runat="server">Please click da button!</asp:label>
    </form>
</body>
</html>

asp:button: command name and arguments (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
End Sub
Sub CommandButton_Click(Sender As Object, E As CommandEventArgs)
  lblButtonPressed.Text = "You pressed: " _
      & E.rumandName & "<BR>With this argument: " _
      & E.rumandArgument & "<BR>"
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Using a Button Control as a Command Button</TITLE>
</HEAD>
<form runat="server">
<asp:label 
    id="lblButtonPressed" 
    runat="server"
/>
<BR><BR>
<asp:button 
    id="butSortName"
    text="Sort By Name"
    oncommand="CommandButton_Click"
    commandname="Sort"
    commandargument="By Name"
    runat="server"
/>
<BR><BR>
<asp:button 
    id="butSortPrice"
    text="Sort By Price"
    oncommand="CommandButton_Click"
    commandname="Sort"
    commandargument="By Price"
    runat="server"
/>
<BR><BR>
<asp:button 
    id="lnkbutNewSearch"
    text="New Search"
    oncommand="CommandButton_Click"
    commandname="New Search"
    commandargument="None"
    runat="server"
/>
</form>
</BODY>
</HTML>

asp:button event to change the label text (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
    Sub Button1_Click(sender As Object, e As EventArgs)
    
      Label2.Text = "The button has been clicked"
    
    End Sub
    
    Sub Page_Load(sender As Object, e As EventArgs)
    
      If Page.IsPostBack Then
        Label1.Text = "The page has been loaded because of a button click"
      Else
        Label1.Text = "The page has been loaded for the first time"
      End If
      Label2.Text = ""
    
    End Sub
</script>
<html>
<head>
</head>
<body>
    <form runat="server">
        <p>
            <asp:Button id="Button1" onclick="Button1_Click" runat="server" Text="Button"></asp:Button>
        </p>
        <p>
            <asp:Label id="Label1" runat="server">Label</asp:Label>
        </p>
        <p>
            <asp:Label id="Label2" runat="server">Label</asp:Label>
        </p>
    </form>
</body>
</html>

asp button on client click (C#)

<%@ Page Language="C#" %>
<script runat="server">
    protected void btnDelete_Click(object sender, EventArgs e)
    {
        lblResult.Text = "All pages deleted!";
    }
</script>
<html>
<head>
    <title>Button OnClientClick</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Button
        id="btnDelete"
        Text="Delete Website"
        OnClick="btnDelete_Click"
        OnClientClick="return confirm("Are you sure?");" 
        Runat="server" />
    
    <asp:Label
        id="lblResult"
        Runat="server" />    
    
    </div>
    </form>
</body>
</html>

asp button postbackurl (C#)

<%@ Page Language="C#" %>
<html>
<head id="Head1" runat="server">
    <title>Button Search</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblSearch"
        Text="Search:"
        Runat="server" />
    <asp:TextBox
        id="txtSearch"
        Runat="server" />
    <asp:Button
        id="btnSearch"
        Text="Go!"
        PostBackUrl="ButtonSearchResults.aspx"
        Runat="server" />
    </div>
    </form>
</body>
</html>

<%--
<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load()
    {
        if (PreviousPage != null)
        {
            TextBox txtSearch = (TextBox)PreviousPage.FindControl("txtSearch");
            lblSearch.Text = String.Format("Search For: {0}", txtSearch.Text);
        }
    }
    
</script>
<html>
<head>
    <title>Button Search Results</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblSearch"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>
--%>

Button action Command and Parameter (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    lblMessage.Text = "Press a button!"
End Sub
Sub SubmitBtn2_Click(Sender As Object, E As CommandEventArgs)
    lblMessage.Text = "The button you clicked: " _
        & e.rumandName _
        & ", has the following arguement: " _
        & e.rumandArgument & "."
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Button Controls Sample Page</TITLE>
</HEAD>
<BODY>
<form runat="server">
<Font Face="Tahoma" Size="+1">
<asp:Label 
    id="lblMessage" 
    Text="Press a button!"
    runat="server"
/>
<asp:Button 
    id="butAdd"
    text="Add Record"
    CommandName="Add"
    CommandArgument="None"
    OnCommand="SubmitBtn2_Click" 
    runat="server"
/>
<asp:Button 
    id="butEdit"
    text="Edit Record"
    CommandName="Edit"
    CommandArgument="None"
    OnCommand="SubmitBtn2_Click" 
    runat="server"
/>
<asp:Button 
    id="butSortA"
    text="Sort A-Z"
    CommandName="Sort"
    CommandArgument="A"
    OnCommand="SubmitBtn2_Click" 
    runat="server"
/>
<asp:Button 
    id="butSortD"
    text="Sort Z-A"
    CommandName="Sort"
    CommandArgument="D"
    OnCommand="SubmitBtn2_Click" 
    runat="server"
/>
</Font>
</Form>
</BODY>
</HTML>

Button counter: click and change button label (C#)

<%@ Page Language="C#" %>
<script runat="server">
    protected void Button_Click(object sender, EventArgs e)
    {
        Button btn = (Button)sender;
        btn.Text = (Int32.Parse(btn.Text) + 1).ToString();
    }
</script>
<html>
<head>
    <title>Button Counters</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    First Counter:
    <asp:Button
        id="Button1"
        Text="0"
        OnClick="Button_Click" 
        Runat="server" />
    
    Second Counter:    
    <asp:Button
        id="Button2"
        Text="0"
        OnClick="Button_Click" 
        Runat="server" />    
    
    </div>
    </form>
</body>
</html>

Button event Handler (C#)

<%@ Page Language="C#" Debug="true"%>
<script runat="server">
    void ClickHandler(object sender, EventArgs e)
    {
        if (ExtraInfoBox.Checked)
        {
            Message.Text = "You will hear from us shortly";
        }
        else
        {
            Message.Text = "You will not receive any further information from us";
        }
    }
</script>
<html>
<head>
</head>
<body>
    <form runat="server">
        <asp:CheckBox id="ExtraInfoBox" runat="server" Text="Click here to receive extra information"></asp:CheckBox>
        <br />
        <br />
        <asp:Button id="Button1" onclick="ClickHandler" runat="server" Text="Click here to submit"></asp:Button>
        <br />
        <br />
        <asp:Label id="Message" runat="server"></asp:Label>
    </form>
</body>
</html>

CausesValidation="False"

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Default</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label2" 
                   runat="server" 
                   Text="Must Be a Date and Earlier than Today"></asp:Label><br />
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidator1" 
                              runat="server" 
                              ControlToValidate="TextBox2"
                              ErrorMessage="TextBox2 Must Be a Date and Earlier than Today" 
                              Operator="LessThan"
                              SetFocusOnError="True" 
                              Type="Date">*</asp:CompareValidator><br />
        <asp:Button ID="Button1" 
                    runat="server" 
                    OnClick="Button1_Click" 
                    Text="Submit" />
        <asp:Button ID="Button2" 
                    runat="server" 
                    CausesValidation="False" 
                    Text="Cancel - Will Not Validate!" />
        <asp:Button ID="Button3" 
                    runat="server" 
                    Text="Validate DropDownList1 Only" 
                    ValidationGroup="DDL" /><br />
        <asp:ValidationSummary ID="ValidationSummary1" runat="server" ShowMessageBox="True" />
        <asp:ValidationSummary ID="ValidationSummary2" 
                               runat="server" 
                               ShowMessageBox="True"
                               ValidationGroup="DDL" />
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    this.rupareValidator1.ValueToCompare = DateTime.Today.ToShortDateString();
    }
  protected void Button1_Click(object sender, EventArgs e)
  {
    this.Validate(string.Empty);
    if (this.IsValid==false)
    {
      // Do something...
    }
  }
}

Event driven page (VB.net)

<script runat="server" language="vb">
  Sub Add(sender as object, e As EventArgs)
    lblAnswer.Text = CDbl(tbxInput1.text) + CDbl(tbxInput2.text)
  End Sub
  Sub Subtract(sender as object, e As EventArgs)
    lblAnswer.Text = CDbl(tbxInput1.text) - CDbl(tbxInput2.text)
  End Sub
  Sub Factor(sender as object, e As EventArgs)
    lblAnswer.Text = CDbl(tbxInput1.text) * CDbl(tbxInput2.text)
  End Sub
  Sub Ratio(sender as object, e As EventArgs)
    lblAnswer.Text = CDbl(tbxInput1.text) / CDbl(tbxInput2.text)
  End Sub
</script>
<html>
  <form runat="server">
    <asp:textbox id="tbxInput1" runat="server" />
    <asp:button id="btnAdd" runat="server" text=" + " Onclick="Add" />
    <asp:button id="btnSubtract" runat="server" text=" ?" 
                                                         Onclick="Subtract" />
    <br/>
    <asp:textbox id="tbxInput2" runat="server" />
    <asp:button id="btnFactor" runat="server" text=" x " Onclick="Factor" />
    <asp:button id="btnRatio" runat="server" text=" ?" Onclick="Ratio" />
    <br/>
    <b>Answer = <asp:Label id="lblAnswer" runat="server" /></b>
  </form>
</html>

Event in code behind file (VB.net)

<%@ Page 
    language=VB 
    debug=true 
    src="EventsInCodeBehind.vb" 
    Inherits="clsEventsInCodeBehind" 
%>
<HTML>
<HEAD>
<TITLE>Inheriting Events in a Code-Behind Files</TITLE>
</HEAD>
<form runat="server">
<BR><BR>
<asp:label
    id="lblMessage1"
    runat="Server"
/>
<BR><BR>
<asp:label
    id="lblMessage2"
    runat="Server"
/>
<BR><BR>
Enter text to uppercase:
<BR>
<asp:textbox
    id="txtUCase"
    runat="Server"
/>
<BR><BR>
Add Numbers:
<BR>
<asp:textbox
    id="txtNumber1"
    runat="Server"
/>
<BR>
<asp:textbox
    id="txtNumber2"
    runat="Server"
/>
<asp:button 
    id="butAdd"
    text="Add"
    runat="server"
/>
</form>
</BODY>
</HTML>
<%--
Public Class clsEventsInCodeBehind
    Inherits System.Web.UI.Page
    Protected WithEvents txtUCase As _
        System.Web.UI.WebControls.TextBox
    Protected WithEvents txtNumber1 As _
        System.Web.UI.WebControls.TextBox
    Protected WithEvents txtNumber2 As _
        System.Web.UI.WebControls.TextBox
    Protected WithEvents lblMessage1 As _
        System.Web.UI.WebControls.Label
    Protected WithEvents lblMessage2 As _
        System.Web.UI.WebControls.Label
    Protected WithEvents butAdd As _
        System.Web.UI.WebControls.Button
    Private Sub Page_Init(ByVal sender As System.Object, _
        ByVal e As System.EventArgs)
        lblMessage1.Text = Date.Now
        txtUcase.AutoPostBack = True
    End Sub
    Private Sub Page_Load(ByVal sender As System.Object, _
        ByVal e As System.EventArgs)
        lblMessage2.Text = Date.Now
    End Sub
    Sub txtUCase_Change(Sender As System.Object, _
        E As System.EventArgs) Handles txtUCase.TextChanged
        Dim TempString as String
        TempString = txtUCase.Text
        txtUCase.Text = TempString.ToUpper()
    End Sub
    Sub butAdd_Click(Sender As System.Object, _
        E As System.EventArgs) Handles butAdd.Click
        butAdd.Text = CSng(txtNumber1.Text) + CSng(txtNumber2.Text)
    End Sub
End Class
--%>

OnClientClick event

<%@ 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 btnDelete_Click(sender AS Object, e As EventArgs)
        lblResult.Text = "All pages deleted!"
    End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button OnClientClick</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Button
        id="btnDelete"
        Text="Delete Website"
        OnClick="btnDelete_Click"
        OnClientClick="return confirm("Are you sure?");" 
        Runat="server" />
    
    <br /><br />
    
    <asp:Label
        id="lblResult"
        Runat="server" />    
    
    </div>
    </form>
</body>
</html>

onmouseover and onmouseout events

<%@ Page Language="VB" %>
<!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" >
<head id="Head1" runat="server">
    <title>Button Expando</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        onmouseover="this.value="Click Here!""
        onmouseout="this.value="Submit""
        Runat="server" />
    
    </div>
    </form>
</body>
</html>

Read input and do the calculation in Button action listener (C#)

<%@ Page Language="C#" Debug="True" %>
<script runat="server">
    void Page_Load()
    {
        btnAdd.BackColor = System.Drawing.Color.LightGray;
        btnSubtract.BackColor = System.Drawing.Color.LightGray;
        btnMultiply.BackColor = System.Drawing.Color.LightGray;
        btnDivide.BackColor = System.Drawing.Color.LightGray;
    }
    
    void Add(object sender, EventArgs e)
    {
        double answer = Convert.ToDouble(txtInput1.Text) +
                        Convert.ToDouble(txtInput2.Text);
        lblAnswer.Text = answer.ToString();
        btnAdd.BackColor = System.Drawing.Color.Yellow;
    }
    
    void Subtract(object sender, EventArgs e)
    {
        double answer = Convert.ToDouble(txtInput1.Text) -
                        Convert.ToDouble(txtInput2.Text);
        lblAnswer.Text = answer.ToString();
        btnSubtract.BackColor = System.Drawing.Color.Yellow;
    }
    
    void Multiply(object sender, EventArgs e)
    {
        double answer = Convert.ToDouble(txtInput1.Text) *
                        Convert.ToDouble(txtInput2.Text);
        lblAnswer.Text = answer.ToString();
        btnMultiply.BackColor = System.Drawing.Color.Yellow;
    }
    
    void Divide(object sender, EventArgs e)
    {
        double answer = Convert.ToDouble(txtInput1.Text) /
                        Convert.ToDouble(txtInput2.Text);
        lblAnswer.Text = answer.ToString();
        btnDivide.BackColor = System.Drawing.Color.Yellow;
    }
</script>
<html>
<head>
    <title>Calculator example v1</title>
</head>
<body>
    <form runat="server">
        <h2>Calculator Version 1 
        </h2>
        <asp:TextBox id="txtInput1" runat="server"></asp:TextBox>
        <asp:Button id="btnAdd" onclick="Add" runat="server" Text=" + "></asp:Button>
        <asp:Button id="btnSubtract" onclick="Subtract" runat="server" Text=" - "></asp:Button>
        <br />
        <asp:TextBox id="txtInput2" runat="server"></asp:TextBox>
        <asp:Button id="btnMultiply" onclick="Multiply" runat="server" Text=" x "></asp:Button>
        <asp:Button id="btnDivide" onclick="Divide" runat="server" Text="/"></asp:Button>
        <br />
        <strong>Answer = <asp:Label id="lblAnswer" runat="server"></asp:Label></strong>
    </form>
</body>
</html>

Set Button text (VB.net)

<%@ Page Language="VB" %>
<script language="vb" runat="server">
    Sub Page_Load(Source As Object, E as EventArgs)
      If Not IsPostBack Then
        MyButton.Text = "OK"
        MyDropDownList.Items.Add("http://www.nfex.ru")
        MyDropDownList.Items.Add("http://www.google.ru")
      End If
    End Sub
  </script>
<html>
 <body>
  <form id="WebForm1" method="post" runat="server">
    <asp:DropDownList id=MyDropDownList runat="server"/>
    <asp:button id=MyButton runat="server" Text=""/>
  </form>
 </body>
</html>

ASP.Net/Asp Control/Button — различия между версиями

Версия 15:30, 26 мая 2010

Содержание

Add action listener to a server Button (VB.net)

Add action listener to asp Button by delegate (C#)

asp:button: command name and arguments (VB.net)

asp:button event to change the label text (VB.net)

asp button on client click (C#)

asp button postbackurl (C#)

Button action Command and Parameter (VB.net)

Button counter: click and change button label (C#)

Button event Handler (C#)

CausesValidation="False"

Event driven page (VB.net)

Event in code behind file (VB.net)

OnClientClick event

onmouseover and onmouseout events

Read input and do the calculation in Button action listener (C#)

Set Button text (VB.net)

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Текущая версия на 11:52, 26 мая 2010 (просмотреть исходный код) Admin (обсуждение \| вклад) м (1 версия)	Версия 15:30, 26 мая 2010 (просмотреть исходный код) (обсуждение) Следующая правка →
(нет различий)