If statement in repeaters ItemTemplate

I’m using an ASP.NET Repeater to display the contents of a <table>. It looks something like this:

<table cellpadding="0" cellspacing="0">
    <asp:Repeater ID="checkboxList" runat="server" OnItemDataBound="OnCheckboxListItemBound">
        <ItemTemplate>
            <tr id="itemRow" runat="server">
                <td>
                    Some data
                </td>
            </tr>
        </ItemTemplate>
    </asp:Repeater>
</table>

It works fine, but i’d like to have an if() statement inside the ItemTemplate so i can conditionally determine if i want to print out a <tr> tag.

So i’d like to have something like this:

<table cellpadding="0" cellspacing="0">
    <asp:Repeater ID="checkboxList" runat="server" OnItemDataBound="OnCheckboxListItemBound">
        <ItemTemplate>

            <% if ( (CurrentItemCount % 2) == 0 ) { %?>
            <tr id="itemRow" runat="server">
            <% } %>
                <td>
                    Some data
                </td>
            <% if ( (CurrentItemCount % 2) == 0 ) { %?>
            </tr>
            <% } %>
        </ItemTemplate>
    </asp:Repeater>
</table>

Is there some way i can achieve this?

PS. The CurrentItemCount is just made up. I also need a way to get the current item count inside that if() statement. But i only seem to be able to get it from <%# Container.ItemIndex; %>, which can’t be used with an if() statement?

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Another way of doing this (if performance is not a problem):

<ItemTemplate>
  <!-- "If"  -->
  <asp:PlaceHolder runat="server" Visible="<%# MyCondition %>">
    <tr><td></td></tr>
  </asp:PlaceHolder>  
  <!-- "Else" -->
  <asp:PlaceHolder runat="server" Visible="<%# !MyCondition %>">
    <tr><td></td></tr>
  </asp:PlaceHolder>
</ItemTemplate>

Method 2

If you’re trying yo make a 2 columns table this could do the trick

<%# Container.ItemIndex % 2 == 0 ? "<tr class='itemRow'>" : "" %>
    <td>
       Some data
    </td>
<%# Container.ItemIndex % 2 != 0 ? "</tr> : "" %>

Changed a couple of things: id="itemRow" for all rows would cause repeated ids what is not allowed.

Removed runat="server" since doesn’t make sense on this context.

Method 3

I have 2 examples, for the examples i will bind the repeater to a array of strings (demonstration purposes only)

void BindCheckboxList()
{
 checkboxList.DataSource = new string[] { "RowA", "RowB", "RowC", "RowD", "RowE", "RowF", "RowG" };
 checkboxList.DataBind();
}

Example 1: Create a methode in de codebehind casting the bound elements back en evaluate what ever value you’d like.

Create Methode in CodeBehind (example 1):

protected string StringDataEndsWith(object dataElement, string endsWith, string  returnValue)
{
// for now an object of the type string, can be anything.
string elem = dataElement as string;
    if (elem.EndsWith(endsWith))
    {
     return returnValue; 
    }
     else
    {
     return ""; 
    }
}

In the .aspx file (example 1):

<asp:Repeater ID="checkboxList" runat="server">
<HeaderTemplate> 
    <table style="padding:0px;margin:0px;">
</HeaderTemplate> 
<ItemTemplate>
    <%# StringDataEndsWith(Container.DataItem,"A","<tr id="itemRow" runat="server">")  %>
    <td>
        <%# Container.DataItem  %>
    </td>
    <%# StringDataEndsWith(Container.DataItem,"G","</tr>")  %>
</ItemTemplate>
<FooterTemplate>
    </table>
</FooterTemplate>
</asp:Repeater>

Example 2: You could use a direct cast in the .aspx file

DirectCast example (no code behind):

<asp:Repeater ID="checkboxList" runat="server">
<HeaderTemplate> 
    <table style="padding:0px;margin:0px;">
</HeaderTemplate> 
<ItemTemplate>
    <%# Convert.ToString(Container.DataItem).EndsWith("A") ? "<tr id="itemRow" runat="server">" : ""  %>
    <td>
        <%# Container.DataItem  %>
    </td>
    <%# Convert.ToString(Container.DataItem).EndsWith("G") ? "</tr>" : ""  %>
</ItemTemplate>
<FooterTemplate>
    </table>
</FooterTemplate>
</asp:Repeater>

I hope this is what you’re looking for. Regards.

Method 4

If you’re wanting to do something on every other item, use the alternating item template.
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.repeater.alternatingitemtemplate.aspx

Method 5

I would use codebehind:

protected void OnCheckboxListItemBound(Object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        HtmlTableRow itemRow = (HtmlTableRow) e.Item.FindControl("itemRow");
        itemRow.Visible = e.Item.ItemIndex % 2 == 0;
    }
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0