Hi Andrew,
According to your description, I've performed some tests, it seems a simple
page with dropdownlist and requiredFieldValidator will not produce the
exact behavior. Here is a simple test page I used:
========aspx============
<form id="form1" runat="server">
<div>
</div>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem></asp:ListItem>
<asp:ListItem>aaa</asp:ListItem>
<asp:ListItem>bbb</asp:ListItem>
<asp:ListItem>ccc</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="DropDownList1"
ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<br />
<br />
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem></asp:ListItem>
<asp:ListItem>aaa</asp:ListItem>
<asp:ListItem>bbb</asp:ListItem>
<asp:ListItem>ccc</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="DropDownList2"
ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<br />
<br />
<asp:DropDownList ID="DropDownList3" runat="server">
<asp:ListItem></asp:ListItem>
<asp:ListItem>aaa</asp:ListItem>
<asp:ListItem>bbb</asp:ListItem>
<asp:ListItem>ccc</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="DropDownList3"
ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<br />
<br />
<asp:Button ID="btnPost" runat="server" onclick="btnPost_Click"
Text="Post Button" />
<asp:Button ID="btnClear" runat="server" onclick="btnClear_Click"
Text="Clear Button" />
</form>
=-========code behind=======
public partial class ValidatePage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnPost_Click(object sender, EventArgs e)
{
}
protected void btnClear_Click(object sender, EventArgs e)
{
Response.Write("<br/>Page.IsValid: " + Page.Validators[0].IsValid);
DropDownList1.ClearSelection();
DropDownList2.ClearSelection();
DropDownList3.ClearSelection();
Response.Write("<br/>Page.IsValid: " + Page.Validators[0].IsValid);
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
Response.Write("<br/>Page.IsValid: " + Page.Validators[0].IsValid);
}
}
=======================
It seems as long as the page postback(when I click the Clear Button) and
passed client-side validation, the server-side validation won't return
false after I "ClearSelection" on the dropdownlists.
As you mentioned that there are other forms and usercontrols, I'm wondering
whether some input entry in them may cause the problem. Have you tried
removing some of them to isolate the behavior?
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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--------------------
>From: "Andrew Jocelyn" <j0**@newsgroups.nospam>
References: <uP**************@TK2MSFTNGP03.phx.gbl>
<6D**********************************@microsoft.co m>
>Subject: Re: Page.IsValid changes to false after button click
Date: Sat, 12 Apr 2008 11:29:30 +0100
Hi Bruce
That doesn't seem to be the case in my simple test with a single validator
on a page. The Page.IsValid value does not change how ever many times I
call
>it. However it does change in my project page which contains a FormView
control with a number of UserControls. What I don't seem to be able to do
is
>find out where or why it's changing.
Any ideas?
Thanks
Andrew
