When you put that function call directly into your code with the
OnSelectedIndexChanged="<%# TestFunction %>" the OnSelectedIndexChanged
event will call whatever the TestFunction returns. So if TestFunction
returns "FooBar" (a string) then the FooBar function will fire when the
index changes. Or you could say OnSelectedIndexChanged="TestFunction". I
guess the first example allows you to programatically change your events
fired. I don't see the upside of that of the top of my head.
- Justin
On 8/17/05, David Lambert <dal@xxxxxxxx> wrote:
>
> Ok, I've finally figured this out. The method I thought I'd need to use
> was to code in the dropdownlist
> OnSelectedIndexChanged event property in the aspx page thusly...
>
> <asp:DropDownList id=ddlHeadings runat="server" AutoPostBack="True"
> DataTextField="Heading" DataValueField="Heading" DataSource="<%#
> GetItemHeaders(True) %> OnSelectedIndexChanged="<%# TestFunction %>">
>
> what actually works is...
>
> <asp:DropDownList id=ddlHeadings runat="server" AutoPostBack="True"
> DataTextField="Heading" DataValueField="Heading" DataSource="<%#
> GetItemHeaders(True) %> OnSelectedIndexChanged="TestFunction">
>
> where the call OnSelectedIndexChanged="TestFunction" executes the
> TestFunction in the server vb code. The problem was I was using the
> same formating as I was using for the datasource and selected index
> properties which codes in a <%# notation around the function call. In
> examining yet another example I noticed that this odd notation was
> missing.
>
> It's not really obvious to me when and why this notation is necessary
> (and maybe someone can enlighten me) but it was what was preventing my
> routine from firing the event.
>
> David
>
>
> _____
>
> From: padnug@xxxxxxxxxxxxxxx [mailto:padnug@xxxxxxxxxxxxxxx] On Behalf
> Of David Lambert
> Sent: Wednesday, August 17, 2005 2:06 PM
> To: padnug@xxxxxxxxxxxxxxx
> Subject: [padnug] Where to write event for dropdownlist in datagrid
>
>
> This seems easy
>
> Filter the results datasource that populates a dropdownlist by a
> selection made in a second dropdownlist. It actually is pretty easy if
> the second dropdownlist control is not in a template column in a
> datagrid. However both dropdownlists exists in the same template column
> and I'm having trouble figuring out how to trap the event.
>
> Currently I'm populating the list datasource for both controls from the
> aspx source page thusly
>
> control1
> <asp:DropDownList id=ddlItem runat="server" SelectedIndex='<%#
> GetTagDescrSelectedIndex(DataBinder.Eval(Container.DataItem, "ItemTag"))
> %>' DataTextField="FullDescr" DataValueField="ItemTag" DataSource="<%#
> GetItemDescrDS(True) %>">
>
> control2
> <asp:DropDownList id=ddlHeadings runat="server" AutoPostBack="True"
> DataTextField="Heading" DataValueField="Heading" DataSource="<%#
> GetItemHeaders(True) %>"
>
>
> The number of items in the first control is well over a thousand, so the
> idea is to use the second control to select a smaller subset of items,
> and thus make it easier for the user to find his selection in the list.
>
> My problem is because the second dropdownlist control is created
> dynamically in a datagrid I cannot directly reference the
> selectedindexchanged event.
>
> Any help would be greatly appreciated, thanks
>
>
>
>
>
>
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