Sorry, I meant to say:
Or you could say OnSelectedIndexChanged="FooBar". Which would produce the
same result.
On 8/17/05, Justin Collum <jcollum@xxxxxxxxx> wrote:
>
> 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
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
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