I've written som junk code below to show a problem I'm getting:
On a page I've got a dropdownlist and a button using submit behaviour:
<asp:DropDownLi st ID="tester" runat="server" AutoPostBack="t rue"
EnableViewState ="False"
OnSelectedIndex Changed="tester _SelectedIndexC hanged">
<asp:ListItem Text="All" Value="ALL"></asp:ListItem>
<asp:ListItem Text="2" Value="2"></asp:ListItem>
<asp:ListItem Text="3" Value="3"></asp:ListItem>
<asp:ListItem Text="4" Value="4"></asp:ListItem>
<asp:ListItem Text="5" Value="5"></asp:ListItem>
</asp:DropDownLis t>
<asp:Button ID="Button1" runat="server" CausesValidatio n="False"
EnableViewState ="False"
OnClick="Button 1_Click" Text="Button" />
The codebehind looks like this:
public partial class test : System.Web.UI.P age
{
protected void Page_Load(objec t sender, EventArgs e)
{
if (Request.QueryS tring["id"] != null)
tester.Selected Value =
Request.QuerySt ring["id"].ToString();
}
protected void tester_Selected IndexChanged(ob ject sender,
EventArgs e)
{
Response.Redire ct("test.aspx?i d=" +
Request.Form[tester.UniqueID]);
Response.End();
}
protected void Button1_Click(o bject sender, EventArgs e)
{
Response.Write( "here");
}
}
Whats happening is that the selectedindexch anged event is causing a
redirect which is passing the value of the selected dropdownlist back
to the page, this is then used to select the listitem relating to the
ID. I know this is convoluted, but it's something I need to use as per
a client request.
My issue is that if the button is pressed before selectedindexch anged,
then the button click event is fired. If the selectedindexch naged
event fires, then the button click event won't.
From looking at the html, it seems the postback and redirect is
causing the button behaviour to change from submit to text. This stops
the button click event from being fired.
Why is this occuring? And is there anything I can do to stop it from
happening? I've tried programatically changing the buttons submit
behaviour but it doesn't stop this problem from occuring.
