Slide 12.4: Text boxes (cont.)

Text Boxes (Cont.)

Add a Script
The contents and settings of a TextBox control may be changed by server scripts when a form is submitted. A form can be submitted by clicking on a button or when a user changes the value in the TextBox control. The following example declares three controls:

TextBox control, which is used to create a text box where the user can input text

Button control, which is used to display a push button. It is possible to write an event handler to control the actions performed when the submit button is clicked.

Label control, which is used to display text on a page

When the submit button is triggered via the OnClick event, the submit subroutine is executed. The submit subroutine writes a text to the Label control:

demo_textbox.aspx

Web

<%@ Page Language="C#" %>
<script language="C#" runat="server">
 protected void submit( object sender, EventArgs e ) {
  lbl1.Text = "Your name is " + txt1.Text;
 }
</script>

<html>
 <body> 
  <form runat="server">
   Enter your name:
   <asp:TextBox id="txt1" runat="server" />
   <asp:Button OnClick="submit" Text="Submit"
     runat="server" />
   <p><asp:Label id="lbl1" runat="server" /></p>
  </form>
 </body>
</html>