ASP .NET - The TextBox Control
The TextBox control is used to create a text box where the user
can input text.
The TextBox Control
The TextBox control is used to create a text box where the user
can input text.
The TextBox control's attributes and properties are listed in our
web controls reference page.
The example below demonstrates some of the attributes you may use with the TextBox
control:
Example
<html>
<body>
<form runat="server">
A basic TextBox:
<asp:TextBox id="tb1" runat="server" />
<br /><br />
A password TextBox:
<asp:TextBox id="tb2" TextMode="password" runat="server" />
<br /><br />
A TextBox with text:
<asp:TextBox id="tb4" Text="Hello World!" runat="server" />
<br /><br />
A multiline TextBox:
<asp:TextBox id="tb3" TextMode="multiline" runat="server" />
<br /><br />
A TextBox with height:
<asp:TextBox id="tb6" rows="5" TextMode="multiline"
runat="server" />
<br /><br />
A TextBox with width:
<asp:TextBox id="tb5" columns="30" runat="server" />
</form>
</body>
</html>
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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.
In the following example we declare one TextBox
control, one Button control, and one Label control in an .aspx file. When the
submit button is triggered, the submit subroutine is executed. The submit
subroutine writes a text to the Label control:
Example
<script runat="server">
Sub submit(sender As Object, e As EventArgs)
lbl1.Text="Your name is " & txt1.Text
End Sub
</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>
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In the following example we declare one TextBox
control and one Label control in an .aspx file. When you change the value in the
TextBox and either click outside the TextBox or press the Tab key, the change
subroutine is executed. The submit subroutine writes a text to the Label
control:
Example
<script runat="server">
Sub change(sender As Object, e As EventArgs)
lbl1.Text="You changed text to " & txt1.Text
End Sub
</script>
<html>
<body>
<form runat="server">
Enter your name:
<asp:TextBox id="txt1" runat="server"
text="Hello World!"
ontextchanged="change" autopostback="true"/>
<p><asp:Label id="lbl1" runat="server" /></p>
</form>
</body>
</html>
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