What is the best way to display grouped items horizontally in an ASP.NET ListView?

My ASP ListView currently displays items vertically in columns with GroupItemCount set to 3:

A  D  G
B  E  H
C  F  I

Is there a way to adjust the display so that it groups items horizontally in rows like this?

A  B  C
D  E  F
G  H  I

This is the ListView code I am using:

<asp:ListView ID="ImagesListView" GroupItemCount="4" runat="server" DataSourceID="EntityDataSource1" GroupPlaceholderID="GroupsGoHere" ItemPlaceholderID="ItemsGoHere" Orientation="Horizontal">
    <LayoutTemplate>
        <div runat="server" id="Main" class="ImagePageMainLayout">
            <div id="ItemsDataPager" runat="server" class="ImagePageHeader">
                <asp:DataPager ID="ImagesDataPager" runat="server" PageSize="16" PagedControlID="ImagesListView">
                    <Fields>
                        <asp:NextPreviousPagerField ButtonType="Link" ShowFirstPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" />
                        <asp:NumericPagerField />
                        <asp:NextPreviousPagerField ButtonType="Link" ShowLastPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" />
                    </Fields>
                </asp:DataPager>
            </div>
            <div runat="server" id="GroupsGoHere">
            </div>
        </div>
    </LayoutTemplate>
    <GroupTemplate>
        <div runat="server" id="Images" class="ImagePageGroup">
            <div runat="server" id="ItemsGoHere">
            </div>
        </div>
    </GroupTemplate>
    <ItemTemplate>
        <div id="Item" align="center" runat="server" class="ImagePageItem">
        </div>
    </ItemTemplate>
    <ItemSeparatorTemplate>
        <br />
    </ItemSeparatorTemplate>
</asp:ListView>
.netasp.netcsslistviewhtml

Answer №1

Your use of <DIV> in your templates is causing this issue. Each group of 3 items is placed within a <DIV>, with each item stacked below one another due to the <br /> in the <ItemSeparatorTemplate>. The next group of 3 items then appears beside the previous group.

To resolve this, consider removing the <ItemSeparatorTemplate> and adjust your <GroupTemplate> to include a <br /> after each group like so:

<GroupTemplate>
        <div runat="server" id="Images" class="ImagePageGroup">
            <div runat="server" id="ItemsGoHere">
            </div>
        </div>
        <br />
</GroupTemplate>

It's worth noting that Microsoft's example uses a <table> for formatting the listview.

Update:
After testing your code, it seems that the root cause of the issue lies in CSS. By adding width:250px; to the ImagePageGroup class and width:50px; float: left; to the ImagePageItem Class, I was able to achieve better results without the need for <br />. You may want to experiment with your CSS for optimal layout. Alternatively, testing your div layout in plain HTML or considering a table layout could also be viable options.

Remember, tables are not necessarily bad when used appropriately for displaying tabulated data.

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