disabling default button or enter key in asp.net c#

Question

I have a form where users scan in a barcode, the barcode reader automatically enters a carriage return in the value causing the form to submit since the browser chooses the first button as the default. How can I disable anything from happening when the enter key is pressed when entring a value in that textbox?

Answer 1

You'll need to do it with javascript. In your markup for the text box, add an onkeydown handler like so:

<asp:TextBox ID="TextBox1" runat="server"
   onkeydown = "return (event.keyCode!=13);" >
</asp:TextBox>

This will return false if the key was the enter key, which will cancel the form submission.

Answer 2

Set the TextBox to have the text mode property set to "multiline". Then the carriage return will be in the TextBox.

See also here for a note about what to do if you're using FireFox.