Question

In ASP.net I have a simple textbox and radio button list with yes or no options. On the VB server-side I implement OnClick of the radio button and it does things.

<asp:RadioButtonList ID="rbltest" runat="server" AutoPostBack="true"      OnSelectedIndexChange="rbltest_SelectedIndexChanged"                                                                      <asp:ListItem Text="Yes" Value="0"></asp:ListItem>
<asp:ListItem Selected="True" Text="No" Value="1"></asp:ListItem>
</asp:RadioButtonList>

The only problem is simply that if I click the radio button, then enter data into the TextBox (immediately – in less than 2 seconds), when the radio button returns, it deletes the data. This is annoying. Is there anyway around it?

Answer 1

The only way to fix this is to remove AutoPostBack=true on the RadioButtonList control. The auto-postback option immediately initiates an HTTP post back to the server, so anything typed after then is going to be lost.

Other options:

• Implement a client-side onclick handler, and disable the text while the post-back processes (ie, make it clear to the user that they can’t type anything, aka the principle of least astonishment).
• Implement the change logic completely on the client side using Javascript
• Use the ASP.Net AJAX UpdatePanel to do the postback asynchronously (this would not require a full postback to the server, so would allow you to keep typing).