Why ASP.NEt C# doPostBack function is not appearing in the Html code?

[Saul Fells]

I have a form with multiple dropdownlist and each list has onselectedindex changed defined.

<asp:DropDownList ID="SPR" runat="server" OnSelectedIndexChanged="Reload_OnSelectedIndexChanged" AutoPostBack="true">
    <asp:ListItem Text="1 day" Value="1:D"></asp:ListItem>
    <asp:ListItem Text="5 days" Value="5:D"></asp:ListItem>
    <asp:ListItem Text="1 month" Value="1:M"></asp:ListItem>
    <asp:ListItem Text="3 months" Value="3:M"></asp:ListItem>
    <asp:ListItem Text="6 months" Value="6:M"></asp:ListItem>
    <asp:ListItem Text="1 year" Value="1:Y"></asp:ListItem>
    <asp:ListItem Text="2 years" Value="2:Y"></asp:ListItem>
</asp:DropDownList>

So when I run the page I expect to receive the postbackcode and the select code with the onchange property defined.

When I invoke the pages in Explorer, Safari or Chrome everything works fine but in Firefox the __doPostBack function and the onchange property in the select tags are not defined. Why is that?

[Frinavale]

I don't know why....it should work.
Do you have other JavaScript on the page that might be interfering with the process?

-Frinny

[Saul Fell]

Yes, but there is something tricky. If I change the user agent in Firefox, the code appears and the page works just fine. Why is that? The IIS identify which navigator I am using and decide to give some functionality or not?

[Frinavale]

A friend of mine claimed that that occurs... But I've never experienced it myself.
I use FireFox as my main browser when testing (have been for the last 5 years) and I haven't experienced what you're describing.

What version of the .NET framework are you developing with?

[Saúl Fells]

Another thing, if i run an instance in my computer (debugging from VS2008) and "visit" the page from firefox the code appears, but when i take the project in "production server" the code doen't appear, there is a configuration of the iis that i have to do?

[Frinavale]

Nope, ASP.NET should generate the necessary JavaScript responsible for preforming this task. In fact the __doPostback() method is required for most page submittions ... it should work fine.

[Saul Fells]

Yeah, I know that, but I don't know why is not displaying the code just in Firefox. So, I'm still not able to see the code. Telling to the user to change the user agent is not a viable answer.