I have just uploaded my AutoTabExtender control to my Projects page.  Please feel free to take a look at the code and download it if it’s useful for you.

I decided to create this control when I had a broken hand.  While entering my memorable to login to my online bank account, I realised that having to press ‘tab’ to move from day to month to year was really slowing me down with only one typing hand!!  This control can extend a textbox so that focus automatically moves on when the length of the text entered equals the MaxLength property.  The usage of the extender is as follows:

<asp:TextBox runat="server" ID="txtPart1"MaxLength="2" Columns="2"></asp:TextBox>
<asp:TextBox runat="server" ID="txtPart2"MaxLength="2" Columns="2"></asp:TextBox>
<asp:TextBox runat="server" ID="txtPart3"MaxLength="2" Columns="2"></asp:TextBox>

<spl:AutoTabExtender runat="server" ID="ate1" TargetControlID="txtPart1" NextControlID="txtPart2"></spl:AutoTabExtender>

<spl:AutoTabExtender runat="server" ID="ate2" TargetControlID="txtPart2" NextControlID="txtPart3"></spl:AutoTabExtender>

So, you need an extender for each textbox that should auto-tab.  You then need to specify the NextControlID to indicate to which control the focus should be moved.  In the example above I have used a form for entering a sortcode, so we need an extender for the first and second textboxes.  The extender will also allow ‘natural’ deleting between textboxes.  See the live demo for this here.

The extender should work in IE, FF and Chrome.