Hello Andrew,
From your description, you're putting a placeholder control in FromView's
EditTemplate, and you'll programmatically determine the placeholder's
Visibility according to another dropdownlist's selected item. However, you
found that the placeholder's visiblity doesn't be as expected when you try
perform updating on the Formview, correct?
As for this problem, I still have something need to confirm on your page:
1. Whether the dropdownlist is in FormView or ouside the Formview, but on
the same page.
2. How did you programmatically set the DropDownList's Visibilty and in
which event (page or FormView's) did you put the code
3. When you click update button(or postback the page to trigger FormView's
update command), the formView should return back to readonly mode after the
postback. When did you check the visibility? Do you mean you check in the
updating event(or any other event during the update comand postback)?
I've created a test page on my side based on my understanding. And I put
the programamtic visibility code(for the placeholder) in FormView's Load
event. You can refer to it and let me know if there is anything I missed.
===========aspx=================
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem>aaa</asp:ListItem>
<asp:ListItem>bbb</asp:ListItem>
<asp:ListItem>ccc</asp:ListItem>
<asp:ListItem>ddd</asp:ListItem>
</asp:DropDownList><br />
<asp:FormView ID="FormView1" runat="server"
DataKeyNames="AddressTypeID" DataSourceID="SqlDataSource1"
OnItemCreated="FormView1_ItemCreated"
OnItemUpdating="FormView1_ItemUpdating" OnLoad="FormView1_Load"
OnModeChanged="FormView1_ModeChanged">
<EditItemTemplate>
AddressTypeID:
<asp:Label ID="AddressTypeIDLabel1" runat="server"
Text='<%# Eval("AddressTypeID") %>'></asp:Label><br />
Name:
<asp:TextBox ID="NameTextBox" runat="server" Text='<%#
Bind("Name") %>'></asp:TextBox><br />
<hr />
<asp:PlaceHolder ID="PlaceHolder1" runat="server">
<table>
<tr>
<td>
<asp:Label ID="lblResponseText"
runat="server">Response Text: </asp:Label></td>
<td>
<asp:TextBox ID="tbResponseText"
runat="server" Text='<%# Bind("Name") %>'></asp:TextBox>
</td>
</tr>
</table>
</asp:PlaceHolder>
<br />
<hr />
<br />
<asp:LinkButton ID="UpdateButton" runat="server"
CausesValidation="True" CommandName="Update"
Text="Update"></asp:LinkButton>
<asp:LinkButton ID="UpdateCancelButton" runat="server"
CausesValidation="False" CommandName="Cancel"
Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<InsertItemTemplate>
Name:
<asp:TextBox ID="NameTextBox" runat="server" Text='<%#
Bind("Name") %>'>
</asp:TextBox><br />
<asp:LinkButton ID="InsertButton" runat="server"
CausesValidation="True" CommandName="Insert"
Text="Insert">
</asp:LinkButton>
<asp:LinkButton ID="InsertCancelButton" runat="server"
CausesValidation="False" CommandName="Cancel"
Text="Cancel">
</asp:LinkButton>
</InsertItemTemplate>
<ItemTemplate>
AddressTypeID:
<asp:Label ID="AddressTypeIDLabel" runat="server" Text='<%#
Eval("AddressTypeID") %>'></asp:Label><br />
Name:
<asp:Label ID="NameLabel" runat="server" Text='<%#
Bind("Name") %>'></asp:Label><br />
<asp:LinkButton ID="EditButton" runat="server"
CausesValidation="False" CommandName="Edit"
Text="Edit"></asp:LinkButton>
</ItemTemplate>
</asp:FormView>
</div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorksConnectionString %>"
SelectCommand="SELECT AddressTypeID, Name FROM
Person.AddressType" UpdateCommand="UPDATE Person.AddressType SET">
</asp:SqlDataSource>
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>
=========code behind=============
public partial class FormViewPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void FormView1_ItemCreated(object sender, EventArgs e)
{
}
protected void FormView1_ModeChanged(object sender, EventArgs e)
{
}
protected void FormView1_Load(object sender, EventArgs e)
{
Response.Write("<br/>FormView1_Load+FormView1_CurrentMode: " +
FormView1.CurrentMode);
if (FormView1.CurrentMode == FormViewMode.Edit)
{
if (DropDownList1.SelectedValue == "ccc")
{
FormView1.FindControl("PlaceHolder1").Visible = true;
}
else
{
FormView1.FindControl("PlaceHolder1").Visible = false;
}
}
}
protected void FormView1_ItemUpdating(object sender,
FormViewUpdateEventArgs e)
{
Response.Write("<br/>FormView1_ItemUpdating+FormView1_CurrentMode:
" + FormView1.CurrentMode);
if (FormView1.CurrentMode == FormViewMode.Edit)
{
if (DropDownList1.SelectedValue == "ccc")
{
Response.Write("<br/>Visible: " +
FormView1.FindControl("PlaceHolder1").Visible);
}
}
e.Cancel = true;
}
}
==================================
Hope this helps some. If there is any other questions, please feel free to
let me know.
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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