HtmlInputText Class
Allows programmatic access to the HTML <input type= text> and <input type= password> elements on the server.
For a list of all members of this type, see HtmlInputText Members.
System.Object
System.Web.UI.Control
System.Web.UI.HtmlControls.HtmlControl
System.Web.UI.HtmlControls.HtmlInputControl
System.Web.UI.HtmlControls.HtmlInputText
[Visual Basic] Public Class HtmlInputText Inherits HtmlInputControl Implements IPostBackDataHandler [C#] public class HtmlInputText : HtmlInputControl, IPostBackDataHandler [C++] public __gc class HtmlInputText : public HtmlInputControl, IPostBackDataHandler [JScript] public class HtmlInputText extends HtmlInputControl implements IPostBackDataHandler
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Remarks
Use the HtmlInputText control to create a single line text box that allows the user to enter text or a password. The MaxLength property specifies the maximum number of characters that can be entered in the text box. The Size property allows you to specify the width of the text box. To determine the value entered by the user into text box, use the Value property. The HtmlInputText control provides a ServerChange event that is raised when the Value property changes values between posts to the server. This allows you to create an event handler that performs a custom set of instructions each time the event is raised.
Note The HtmlInputText control does not not provide a built-in way to post back to the server. You must provide another control on the Web page that supports posting to the server, such as an HtmlButton control, to send the value of the control back to the server.
To create a multiline text box, use the HtmlTextArea control.
For a list of initial property values for an instance of HtmlInputText, see the HtmlInputText constructor.
Example
[Visual Basic, C#] The following example demonstrates how to use the HtmlInputText control to get user input.
[Visual Basic] <%@ Page Language="VB" AutoEventWireup="True" %> <html> <head> <script runat="server"> Protected Sub AddButton_Click(sender As Object, e As EventArgs) Dim Answer As Integer Answer = Convert.ToInt32(Value1.Value) + Convert.ToInt32(Value2.Value) AnswerMessage.InnerHtml = Answer.ToString() End Sub </script> </head> <body> <form runat="server"> <h3> HtmlInputText Example </h3> <table> <tr> <td colspan="5"> Enter integer values into the text boxes. <br> Click the Add button to add the two values. <br> Click the Reset button to reset the text boxes. </td> </tr> <tr> <td colspan="5"> </td> </tr> <tr align="center"> <td> <input ID="Value1" Type="Text" Size="2" MaxLength="3" Value="1" runat="server"/> </td> <td> + </td> <td> <input ID="Value2" Type="Text" Size="2" MaxLength="3" Value="1" runat="server"/> </td> <td> = </td> <td> <span ID="AnswerMessage" runat="server"/> </td> </tr> <tr> <td colspan="2"> <asp:RequiredFieldValidator ID="Value1RequiredValidator" ControlToValidate="Value1" ErrorMessage="Please enter an value.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value1MinCompareValidator" ControlToValidate="Value1" Operator="LessThan" Type="Integer" ValueToCompare="100" ErrorMessage="Please enter an integer less than 100.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value1MaxCompareValidator" ControlToValidate="Value1" Operator="GreaterThan" Type="Integer" ValueToCompare="0" ErrorMessage="Please enter an integer greater than 0.<br>" Display="Dynamic" runat="server"/> </td> <td colspan="2"> <asp:RequiredFieldValidator ID="Value2RequiredValidator" ControlToValidate="Value2" ErrorMessage="Please enter an value.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value2MinCompareValidator" ControlToValidate="Value2" Operator="LessThan" Type="Integer" ValueToCompare="100" ErrorMessage="Please enter an integer less than 100.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value2MaxCompareValidator" ControlToValidate="Value2" Operator="GreaterThan" Type="Integer" ValueToCompare="0" ErrorMessage="Please enter an integer greater than 0.<br>" Display="Dynamic" runat="server"/> </td> <td>   </td </tr> <tr align="center"> <td colspan="4"> <input Type="Submit" Name="AddButton Value="Add" OnServerClick="AddButton_Click" runat="server"/> <input Type="Reset" Name="AddButton Value="Reset" runat="server"/> </td> <td> </td> </tr> </table> </form> </body> </html> [C#] <%@ Page Language="C#" AutoEventWireup="True" %> <html> <head> <script runat="server"> protected void AddButton_Click(Object sender, EventArgs e) { int Answer; Answer = Convert.ToInt32(Value1.Value) + Convert.ToInt32(Value2.Value); AnswerMessage.InnerHtml = Answer.ToString(); } </script> </head> <body> <form runat="server"> <h3> HtmlInputText Example </h3> <table> <tr> <td colspan="5"> Enter integer values into the text boxes. <br> Click the Add button to add the two values. <br> Click the Reset button to reset the text boxes. </td> </tr> <tr> <td colspan="5"> </td> </tr> <tr align="center"> <td> <input ID="Value1" Type="Text" Size="2" MaxLength="3" Value="1" runat="server"/> </td> <td> + </td> <td> <input ID="Value2" Type="Text" Size="2" MaxLength="3" Value="1" runat="server"/> </td> <td> = </td> <td> <span ID="AnswerMessage" runat="server"/> </td> </tr> <tr> <td colspan="2"> <asp:RequiredFieldValidator ID="Value1RequiredValidator" ControlToValidate="Value1" ErrorMessage="Please enter an value.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value1MinCompareValidator" ControlToValidate="Value1" Operator="LessThan" Type="Integer" ValueToCompare="100" ErrorMessage="Please enter an integer less than 100.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value1MaxCompareValidator" ControlToValidate="Value1" Operator="GreaterThan" Type="Integer" ValueToCompare="0" ErrorMessage="Please enter an integer greater than 0.<br>" Display="Dynamic" runat="server"/> </td> <td colspan="2"> <asp:RequiredFieldValidator ID="Value2RequiredValidator" ControlToValidate="Value2" ErrorMessage="Please enter an value.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value2MinCompareValidator" ControlToValidate="Value2" Operator="LessThan" Type="Integer" ValueToCompare="100" ErrorMessage="Please enter an integer less than 100.<br>" Display="Dynamic" runat="server"/> <asp:CompareValidator ID="Value2MaxCompareValidator" ControlToValidate="Value2" Operator="GreaterThan" Type="Integer" ValueToCompare="0" ErrorMessage="Please enter an integer greater than 0.<br>" Display="Dynamic" runat="server"/> </td> <td>   </td </tr> <tr align="center"> <td colspan="4"> <input Type="Submit" Name="AddButton Value="Add" OnServerClick="AddButton_Click" runat="server"/> <input Type="Reset" Name="AddButton Value="Reset" runat="server"/> </td> <td> </td> </tr> </table> </form> </body> </html>
[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button
in the upper-left corner of the page.
Requirements
Namespace: System.Web.UI.HtmlControls
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family
Assembly: System.Web (in System.Web.dll)
See Also
HtmlInputText Members | System.Web.UI.HtmlControls Namespace | HtmlTextArea