Conditional HTML in formview results needed... (Full Version)

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knuttlehead -> Conditional HTML in formview results needed... (3/28/2008 17:50:39)

Hi, as a newbie to EW I'm getting the hang of it okay but have a delimma:

I'm successfully using a formview to show my database results including a picture. Now I want to NOT show the picture if the database field 'PhotoFile' is null or empty. This field holds the url of the picture file if it exists on the server.

In the past I just used asp and an If..then statement to compare the ...fp_rs.. to the value somewhere within the data connection. If the condition was met I showed the line of HTML that allowed the image to show. If not, I just skipped that line of HTML.

I've tried things like the following inside the form view where the PhotFile content was fetched:

<%
If Eval("PhotoFile") <> "" Then
%>
'HTML code to show photo
<% Else
'do nothing

End If
%>

Didn't work....please share wisdom if you can.

I think my real problem is not knowing how to use and/or get hold of the data I've retrieved and use it in VB.

I'm sure I'm just going about this all wrong but I just haven't had time to do in-depth study in to the .net coding yet.

Thanks in advance,
Knuttlehead



rdouglass -> RE: Conditional HTML in formview results needed... (3/30/2008 15:00:37)

quote:

If Eval("PhotoFile") <> "" Then


How about this way:

If trim(Eval("PhotoFile")&"") > "" Then

That any better?



knuttlehead -> RE: Conditional HTML in formview results needed... (3/30/2008 18:13:06)

Thanks rdouglas for your reply.

Not sure how this fits my asp.net delimma: My Delimma is Not knowing the syntax required to use the
<%# Eval("photofile") %> data returning method with Visual Basic to Conditionally omit a line of code in formview

I tried your suggestion but got this error:

System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control

Here's my code with your suggestion implimented:

<ItemTemplate>
  <%
If trim(Eval("PhotoFile")&"") > "" Then
%><asp:Image ImageUrl='<%# Bind("PhotoFile") %>' runat="server" id="PhotoFileLabel" ImageAlign="Right" /><%
Else
'Do Nothing
End If
%>
<asp:Label Text='<%# Bind("SubPageName") %>' runat="server" id="SubPageNameLabel" /><br />
etc.....

Further help appreciated...
Knuttlehead



rdouglass -> RE: Conditional HTML in formview results needed... (3/30/2008 18:17:48)

Can you post a little bigger chunk of code that doesn't error? That might give me a better idea as to what you're doing. Unfortunately one of my issues is that I don't use EW and use VS instead so I am not at all sure what interface you're seeing.



knuttlehead -> RE: Conditional HTML in formview results needed... (3/30/2008 18:32:02)

Surely I can... All I want to do is conditionlally show the picture only if the value of 'PhotoFile' retreived from the database is null or equals "". I believe this is the 3rd line of code here?


Here is the whole section for the ItemTemplate:

</InsertItemTemplate>
<ItemTemplate>
  <asp:Image ImageUrl='<%# Bind("PhotoFile") %>' runat="server" id="PhotoFileLabel" ImageAlign="Right" />
<asp:Label Text='<%# Bind("SubPageName") %>' runat="server" id="SubPageNameLabel" /><br />
<br />
<asp:Label Text='<%# Replace(Eval("PageText"),chr(13)& chr(10),"<br>") %>' runat="server" id="PageTextLabel" />
<br />
<br />
<br />
<asp:LinkButton runat="server" Text="Edit" CommandName="Edit" id="EditButton" CausesValidation="False" /> 
<asp:LinkButton runat="server" Text="Delete This Page" CommandName="Delete" id="DeleteButton" CausesValidation="False" /> 
<asp:LinkButton runat="server" Text="Create A New Page" CommandName="New" id="NewButton" CausesValidation="False" />
</ItemTemplate>

Is that enough code?
Thanks a ton...Knuttlehead



rdouglass -> RE: Conditional HTML in formview results needed... (3/31/2008 12:12:16)

quote:

Is that enough code?


Almost. Can you just tell em is it a Repeater, a GridView, or what have you and if you're using a code-behind page.

See, typically I'd build a function but I'm not at all sure if you're comfortable with functions. Are you? For instance, a function I use on a code-behind page looks like this:

Public Function FixTheMoney(ByVal Numbvalue As String) As String
If Trim(Numbvalue & "") = "" Then
Return ("$0.00")
Else
Return FormatCurrency(Trim(Numbvalue), 2)
End If
End Function


and I access it like this in a GridView template field like this:

<asp:TemplateField HeaderText="Fees" SortExpression="CampaignFees">
<ItemTemplate>
<asp:Label ID="Label4" runat="server" Text='<%# FixTheMoney(Eval("CampaignFees")) %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Right" />
<FooterStyle HorizontalAlign="Right" />
</asp:TemplateField>

What that does is remove all the IF..THEN stuff from the GridView and this particular one deals with Nulls as well as numerical data. If it's Null or empty, then it returns $0.00. But I'm not sure how comfortable you are with stuff like that.



knuttlehead -> RE: Conditional HTML in formview results needed... (3/31/2008 12:51:44)

rd,

Can't tell you how much I appreciate your time with this!

I'm using a fromview.

Ahhh,so, I can create and use a function with the <%#eval("whatever") %> code. A glimmer of light for me![:)]

Had a problem with not being able to get the blank lines to show in the data when I was retrieving it from an access database and finally did this similar code that worked good:
<% # Replace(Eval("MixNotes"),chr(13)& chr(10),"<br>") %>

Oh well, I was really hoping I could just use the tag properties sections on EW design view to do the conditional statement somehow, but I'm used to adding asp to frontpage to 'get er done' so guess I'll have to continue that with EW.

I'm pertty sure I understand what you are doing, but I need to learn how to set up a code behind page and I think I'll be in business. Any help with that? Links. Instructions?[8|]



rdouglass -> RE: Conditional HTML in formview results needed... (3/31/2008 14:13:51)

quote:

Any help with that? Links. Instructions


You don't *have* to use codebehind pages but IMO that's one big advantage of .NET and that is to separate the code from the markup. If you have Visual Studio (that's what I use), it's in the doc's but again, I don't know what's available for EW. But here's a pretty good explaination about how to use codebehind pages without VS.

http://www.asp101.com/articles/john/codebehindnovs/default.asp

Hope it helps.



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