IDs the same in header and footer of GridView

[tshad]

I thought IDs had to be unique on a web page.

DotNet, adds a number at the end of IDs in a GridView row when the Grid is rendered so you will have unique IDs. But it doesn't do that for Headers and Footers (and the yet the page works fine).

If you have something like:

<asp:TemplateField ItemStyle-HorizontalAlign="Right" ItemStyle-VerticalAlign="Middle"
    ItemStyle-Width="80px">
    <HeaderTemplate>
        <asp:Label ID="lblQuantityTotal" Text="" runat="server"></asp:Label>
    </HeaderTemplate>
    <FooterTemplate>
        <asp:Label ID="lblQuantityTotal" runat="server"></asp:Label>
    </FooterTemplate>
</asp:TemplateField>

The rendered code may be:
At the top of the Grid

</th><th align="center" scope="col" style="border-color:Black;border-width:2px;border-style:solid;font-weight:bold;">
<span id="[b]MainPlaceHolder_mGridView_lblOrderQuantityTotal[/b]">291</span>

And at the bottom of the Grid

</td><td align="center" style="border-color:Black;border-width:2px;border-style:solid;font-weight:bold;">
<span id="[b]MainPlaceHolder_mGridView_lblOrderQuantityTotal[/b]">291</span>

the ID's for the span are identical, how can that be???

Thanks,

Tom

 

[Qik3Coder]

They are in different child controls. This is why you have to do a "FindInHeader" or a "FindInFooter" to get at the controls.
The ids must be unique among controls IN THE SAME container.
In addition, if you look at the rendered HTML you will note that they get a different Client ID, that is basically the control tree down to the control.

Lodlaiden

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There's a whole lot of Irish in that one.