в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

Admin: 1 версия

2010-05-26T12:00:38Z

1 версия

Новая страница

== asp:TextBox changed event (C#)==



<source lang="csharp">
File: Default.aspx
<%@ Page language="c#" Inherits="EventTracker" CodeFile="Default.aspx.cs" %>
<!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 id="Head1" runat="server">
<title>Event Tracker</title>
</head>
<body>
<form id="Form1" runat="server">
<div>
<h1>Controls being monitored for change events:</h1>
<asp:TextBox ID="txt"
runat="server"
AutoPostBack="true"
OnTextChanged="CtrlChanged" />
<br /><br />
<asp:CheckBox ID="chk"
runat="server"
AutoPostBack="true"
OnCheckedChanged="CtrlChanged"/>
<br /><br />
<asp:RadioButton ID="opt1" runat="server" GroupName="Sample"
AutoPostBack="true" OnCheckedChanged="CtrlChanged"/>
<asp:RadioButton ID="opt2" runat="server" GroupName="Sample"
AutoPostBack="true" OnCheckedChanged="CtrlChanged"/>
<br /><br /><br />
<h1>List of events:</h1>
<asp:ListBox ID="lstEvents" runat="server" Width="355px"
Height="305px" /><br />
</div>
</form>
</body>
</html>

File: Default.aspx.cs
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

public partial class EventTracker : System.Web.UI.Page
{
protected void Page_Load(object sender, System.EventArgs e)
{
Log("<< Page_Load >>");
}
private void Log(string entry)
{
lstEvents.Items.Add(entry);
lstEvents.SelectedIndex = lstEvents.Items.Count - 1;
}
protected void Page_PreRender(object sender, System.EventArgs e)
{
Log("Page_PreRender");
}
protected void CtrlChanged(Object sender, EventArgs e)
{
string ctrlName = ((Control)sender).ID;
Log(ctrlName + " Changed");
}
}</source>

== Bind string value to asp:textBox (VB.net)==



<source lang="csharp">
<script runat="server">
dim strName as String = "A"
dim myArray() as String = {"Hello", "World"}
dim myString as String = "AA"
sub Page_Load(Sender as Object, e as EventArgs)
Page.DataBind()
end sub
</script>
<html>
<form runat="server">
My Name is <%# strName %>
<asp:Listbox datasource="<%# myArray %>" runat="server" />

<asp:Textbox text="<%# myString.ToString %>" runat="server" />
</form>
</html></source>

== Check form input value and report error in case of empty input (VB.net)==



<source lang="csharp">
<%@ Page Language="VB" %>
<script runat="server">
sub Submit(Sender as Object, e as EventArgs)
lblMessage.Text = ""
if tbName.Text = "" then
lblMessage.Text = "You forgot your name!<br>"
end if
if tbPhone.Text = "" then
lblMessage.Text += "You forgot your phone!<br>"
end if
if tbEmail.Text = "" then
lblMessage.Text += "You forgot your email!<br>"
end if

if lblMessage.Text = "" then
lblMessage.Text = "Your information has been " & _
"submitted!"
end if

end sub
</script>
<html><body>
Please enter the following information.
<asp:Label id="lblMessage" runat="server"/>
<form runat="server">
<table>
<tr>
<td width="250">Name* </td>
<td width="150">
<asp:TextBox id="tbName" runat="server"/>
</td>
</tr>
<tr>
<td>Address</td>
<td>
<asp:TextBox id="tbAddress" runat="server"/>
</td>
</tr>
<tr>
<td>Phone* (area code first)</td>
<td>
<asp:TextBox id="tbPhone" runat="server"/>
</td>
</tr>
<tr>
<td>Fax (area code first)</td>
<td>
<asp:TextBox id="tbFax" runat="server"/>
</td>
</tr>
<tr>
<td>Email*</td>
<td>
<asp:TextBox id="tbEmail" runat="server"/>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button id="btSubmit" runat="server" Text="Submit" OnClick="Submit" />
</td>
</tr>
</table>

<i>An asterisk (*) indicates a required field.</i>
</form>
</body></html></source>

== Convert input in TextBox into decimal==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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 runat="server">
<title>Simple Calculator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>The Simple Calculator</h1>
First number:
<asp:TextBox ID="txtFirst" runat="server" />
<br /><br />
Second number:
<asp:TextBox ID="txtSecond" runat="server" />
<br /><br />
<asp:Button ID="btnAdd" runat="server"
OnClick="btnAdd_Click" Text="Add" />
<br /><br />
The answer is:
<asp:Label ID="lblAnswer" runat="server" />
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
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 btnAdd_Click(object sender, EventArgs e)
{
decimal a = decimal.Parse(txtFirst.Text);
decimal b = decimal.Parse(txtSecond.Text);
decimal c = a + b;
lblAnswer.Text = c.ToString();
}
}</source>

== Extrapolate date values from the typed text==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="Default" %>
<!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 runat="server">
<title>Extension Methods</title>
</head>
<body>
<div id="pageContent">
<form id="form1" runat="server">
<asp:TextBox ID="TextBox1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Test" OnClick="Button1_Click" />
<hr />
<h2>Next day is</h2>
<asp:Label ID="Label1" runat="server" />
</form>
</div>

</body>
</html>

File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Linq;
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;
using System.Collections.Generic;
using System.Text;
public static class StringExtensions
{
public static bool IsInt32(this string content)
{
int number;
bool result = Int32.TryParse(content, out number);
return result;
}
public static bool IsDate(this string content)
{
DateTime date;
bool result = DateTime.TryParse(content, out date);
return result;
}
public static DateTime ToDate(this string content)
{
DateTime date;
bool result = DateTime.TryParse(content, out date);
if (result)
return date;
else
return DateTime.MinValue;
}
public static int ToInt32(this string content)
{
int number;
bool result = Int32.TryParse(content, out number);
if (result)
return number;
else
return Int32.MinValue;
}
}
public partial class Default : System.Web.UI.Page
{
public void Button1_Click(object sender, EventArgs e)
{
string content = TextBox1.Text;
if (content.IsDate())
{
DateTime date = content.ToDate();
Label1.Text = date.AddDays(1).ToString("dd MMMM yyyy");
}
else
{
Label1.Text = "Not a valid date.";
}
}
}</source>

== Get input value from asp:textbox (VB.net)==



<source lang="csharp">
<%@Page Language="VB" %>
<script runat="server">
Sub tbMessage_Change(Sender As Object,E As EventArgs)
lblMessage.Text = "Hello" + tbMessage.Text
End Sub
</script>
<html>
<body>
<%Response.Write("Our First Page")%>
<form runat="server">
Please enter your name:
<asp:textbox id="tbMessage" OnTextChanged="tbMessage_Change" runat=server/>
<asp:button id="btSubmit" Text="Submit" runat=server/>
<asp:label id="lblMessage" font-size="20pt" runat=server/>
</form>
</body>
</html></source>

== Important properties, method and event of TextBox control==



<source lang="csharp">
AccessKey: specify a key that navigates to the TextBox control.
AutoCompleteType: associate an AutoComplete class with the TextBox control.
AutoPostBack: post the form containing the TextBox back to the server automatically when the contents of the TextBox is changed.
Columns: specify the number of columns to display.
Enabled: disable the text box.
MaxLength: specify the maximum length of data that a user can enter in a text box (does not work when TextMode is set to Multiline).
ReadOnly: prevent users from changing the text in a text box.
Rows: specify the number of rows to display.
TabIndex: specify the tab order of the text box.
Wrap: specify whether text word-wraps when the TextMode is set to Multiline.
Focus: set the initial form focus to the text box.
TextChange: Raised on the server when the contents of the text box are changed.

<%@ 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">
protected void txtSearch_TextChanged(object sender, EventArgs e)
{
lblSearchResults.Text = "Search for: " + txtSearch.Text;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>TextBox AutoPostBack</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblSearch"
Text="Search:"
Runat="server" />
<asp:TextBox
id="txtSearch"
AutoPostBack="true"
OnTextChanged="txtSearch_TextChanged"
Runat="server" />
<hr />
<asp:Label
id="lblSearchResults"
Runat="server" />
</div>
</form>
</body>
</html></source>

== Set AutoCompleteType==



<source lang="csharp">
<%@ 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>Show AutoComplete</title>
</head>
<body>
<form id="form1" runat="server">
<div>

<asp:Label
id="lblFirstName"
Text="First Name:"
AssociatedControlID="txtFirstName"
Runat="server" />
<br />
<asp:TextBox
id="txtFirstName"
AutoCompleteType="FirstName"
Runat="server" />
<br /><br />
<asp:Label
id="lblLastname"
Text="Last Name:"
AssociatedControlID="txtLastName"
Runat="server" />
<br />
<asp:TextBox
id="txtLastName"
AutoCompleteType="LastName"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />

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

== Set textbox text value in button action==



<source lang="csharp">
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="MyPage" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="The city name"></asp:Label>
<asp:Label ID="note" runat="server" Text="Label"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Display" />
</div>
</form>
</body>
</html>

File: Default.aspx.vb

Partial Class MyPage
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
If Me.TextBox1.Text = "" Then
Me.note.Text = "Please input the city name"
Else
Me.note.Text = "The input is:" & Me.TextBox1.Text
End If
End Sub
End Class</source>

== Set the focus to a TextBox==



<source lang="csharp">
<%@ 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 Page_Load()
{
txtFirstName.Focus();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>TextBox Focus</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblFirstName"
Text="First Name:"
AssociatedControlID="txtFirstName"
Runat="server" />
<br />
<asp:TextBox
id="txtFirstName"
AutoCompleteType="FirstName"
Runat="server" />
<br /><br />
<asp:Label
id="lblLastname"
Text="Last Name:"
AssociatedControlID="txtLastName"
Runat="server" />
<br />
<asp:TextBox
id="txtLastName"
AutoCompleteType="LastName"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html></source>

== Show AutoComplete==



<source lang="csharp">
<%@ Page Language="C#" %>
<!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>Show AutoComplete</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblFirstName"
Text="First Name:"
AssociatedControlID="txtFirstName"
Runat="server" />
<br />
<asp:TextBox
id="txtFirstName"
AutoCompleteType="FirstName"
Runat="server" />
<br /><br />
<asp:Label
id="lblLastname"
Text="Last Name:"
AssociatedControlID="txtLastName"
Runat="server" />
<br />
<asp:TextBox
id="txtLastName"
AutoCompleteType="LastName"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html></source>

== TextBox can display different types of input fields depending TextMode property==



<source lang="csharp">
The TextMode property accepts the following three values:
SingleLine: Displays a single-line input field.
MultiLine: Displays a multi-line input field.
Password: Displays a single-line input field in which the text is hidden.
<%@ Page Language="C#" %>
<!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>Show TextBox</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox
id="txtUserName"
TextMode="SingleLine"
Runat="server" />
<br /><br />
<asp:TextBox
id="txtPassword"
TextMode="Password"
Runat="server" />
<br /><br />
<asp:TextBox
id="txtComments"
TextMode="MultiLine"
Runat="server" />
</div>
</form>
</body>
</html></source>

== Use Cint to convert input value in asp:textbox to integer (VB)==



<source lang="csharp">
<%@ Page Language="VB" %>
<script runat="server">
Sub btSubmit_Click(Sender As Object, E As EventArgs)
lblMessage.Text = Cint(tbNumber1.Text) * Cint(tbNumber2.Text)
End Sub
</script>
<HTML>
<HEAD>
</HEAD>
<BODY>
<form runat="server">
Number 1: <asp:textbox id="tbNumber1" runat=server/>
Number 2: <asp:textbox id="tbNumber2" runat=server/>
<asp:button id="btSubmit" Text="Submit" OnClick="btSubmit_Click" runat=server/>
<asp:label id="lblMessage" font-size="20pt" runat=server/>
</form>
</BODY>
</HTML></source>

== Use Convert.ToInt32 to convert input value in asp:textbox to integer (C#)==



<source lang="csharp">
<%@ Page Language="C#" %>
<script runat="server">
void btSubmit_Click(Object Sender, EventArgs e) {
lblMessage.Text = (Convert.ToInt32(tbNumber1.Text) * Convert.ToInt32(tbNumber2.Text)).ToString();
}
</script>
<HTML>
<HEAD>
</HEAD>
<BODY>
<form runat="server">
Number 1: <asp:textbox id="tbNumber1" runat=server/>
Number 2: <asp:textbox id="tbNumber2" runat=server/>
<asp:button id="btSubmit" Text="Submit" OnClick="btSubmit_Click" runat=server/>
<asp:label id="lblMessage" font-size="20pt" runat=server/>
</form>
</BODY>
</HTML></source>

== Use if statement to check form input data (VB.net)==



<source lang="csharp">
<script runat="server">
sub Submit(Sender as Object, e as EventArgs)
if tbFName.Text <> "" and not IsNumeric(tbFName.Text) then
lblMessage.Text = "First name is incorrect!"
end if
if tbLName.Text <> "" and not IsNumeric(tbLName.Text) then
lblMessage.Text = "Last name is incorrect!"
end if
if tbAddress.Text <> "" then
lblMessage.Text = "Address is incorrect!"
end if

if tbCity.Text <> "" and not IsNumeric(tbCity.Text) then
lblMessage.Text = "City is incorrect!"
end if

if tbState.Text <> "" and not IsNumeric(tbState.Text) then
lblMessage.Text = "State is incorrect!"
end if

if tbZIP.Text <> "" and IsNumeric(tbZIP.Text) then
lblMessage.Text = "ZIP is incorrect!"
end if

if tbPhone.Text <> "" then
lblMessage.Text = "Success!"
else
lblMessage.Text = "Phone is incorrect!"
end if
end sub
</script>
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server" /><br>
<asp:Panel id="Panel1" runat="server">
First and last name:
<asp:TextBox id="tbFName" runat="server" />
<asp:TextBox id="tbLName" runat="server" />
Email:
<asp:TextBox id="tbEmail"
runat="server" />
Address:
<asp:TextBox id="tbAddress"
runat="server" />
City, State, ZIP:
<asp:TextBox id="tbCity"
runat="server" />,
<asp:TextBox id="tbState" runat="server"
size=2 /> 
<asp:TextBox id="tbZIP" runat="server"
size=5 />
Phone:
<asp:TextBox id="tbPhone" runat="server"
size=11 />
<asp:Button id="btSubmit" runat="server"
text="Add" OnClick="Submit"/>
</asp:Panel>
</form>
</body></html></source>

← Предыдущая	Версия 15:30, 26 мая 2010
(нет различий)

ASP.NET Tutorial/ASP.net Controls/TextBox - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия