Only write to page if property != null, in a PageList

Henrik Mathiesen

November 28 2011, 15:53

Hi all!

I have a PageList and it lists propertys from child pages, like this.

Now, if the editor havent written anything in the property on the child's page type I dont want it to be written on the page. So, I tried

<% if (Container.CurrentPage["EventDate"] != null) { %>
<%# Container.CurrentPage["EventDate"] %>
<% } %>

But that doesnt work. Neither does (because it is always null)

<% if (CurrentPage["EventDate"] != null) { %>
<%# Container.CurrentPage["EventDate"] %>
<% } %>

How do I solve it? And please, as easy as possible! =) Thank you very much.

Henrik Mathiesen
November 28 2011, 17:19
The intel says that 'System.ComponentModel.Container' will bind it, but it doesnt work!
Johan Kronberg
November 29 2011, 0:11
Maybe something like this:

<%# Container.CurrentPage["EventDate"] != null ? ((DateTime)Container.CurrentPage["EventDate"]).ToString() : string.Empty%>
Henrik Mathiesen
November 29 2011, 8:20
Johan: many many thanks. However that code gave some casting error. But I tried this and it worked:

<%# Container.CurrentPage["EventDate"] != null ? (Container.CurrentPage["EventDate"]).ToString() : string.Empty %>

Can you also write this?

<%# Container.CurrentPage["EventDate"] != null ? (Container.CurrentPage["EventDate"]) : null %>

There is however a little caveat. You see the code is like this really:

<itemTemplate>
<h3 style="...">
<%# Container.CurrentPage["EventDate"] %>
</h3>
</itemTemplate>

So, if I also want to get rid of the h3? But you solution will certenly work, and Iam very gratefull. Thanks.
Henrik Mathiesen
November 29 2011, 8:27
Ah! You can do like this:

<%# Container.CurrentPage["EventDate"] != null ? ("<htmlCode>"+Container.CurrentPage["EventDate"]).ToString() : string.Empty%>
Johan Kronberg
November 29 2011, 9:01
I just assumed EventDate was a DateTime-property... If it's just a short string:

<%# Container.CurrentPage["EventDate"] != null ? "<htmlCode>" + Container.CurrentPage["EventDate"].ToString() + "</htmlCode>" : string.Empty%>

Or use a PlaceHolder if you need your HTML more readable and not inside code blocks:

<asp:PlaceHolder runat="server" Visible='<%# Container.CurrentPage["EventDate"] != null%>'>

<h3 style="...">
<%# Container.CurrentPage["EventDate"] %>
</h3>

</asp:PlaceHolder>
Henrik Mathiesen
November 29 2011, 9:58
Johan: Thank you!! Awesome. Splendid. So helpful. Have a superb day.