Question

I’ve just added some JavaScript to the onclick of a Button in ASP.NET to disable the button (in order to prevent the user submitting the form twice).

When I click this button, the page posts back fine but no control event handler runs – ASP.NET seems unable to determine which control posted the page back.

I’m a bit stumped by this unexpected behaviour. Can anyone explain it and suggest an alternative way of doing this?

Answer 1

Try This:

<asp:Button ID="Button1" UseSubmitBehavior="false" 
     OnClientClick="javascript:document.getElementById('Button1').disabled = true;    __doPostBack('__Page', '');" 
     onclick="Button1_Click" runat="server" Text="Button" />

It’ll come through with no extra request inspection needed.

After your comment about how you add the onclick:
Just add _doPostBack(‘_Page’, ‘YOURBUTTONNAME’) and inspect the event args on the server side.