[Zope] Newbie: Confusion at sequence-odd, sequence-even and sequence-start

[Martin Gebert]

odd and even aren't calculated by the sequence-number but by -index, 
which starts at 0, which is defined as an even number...

HTH

Martin

Alfredo P. Ricafort schrieb:

>Hi,
>
>I have this code that display images in a 2-column table.  The idea is
>for <dtml-in> to loop inside a folder containing these images.  When the
>counter is odd, an opening <tr> will be inserted; and when a the counter
>is even a closing </tr> is inserted as well.  
>
> ---------------------
>|  Image 1 | Image 2  |
> ---------------------
>|  Image 3 | Image 4  |
> ---------------------
>
>The code is like this:
>
><table width=100% border=1>
><dtml-in objectValues>
>
>   <dtml-if sequence-odd>          # Check if the sequence no. is even
>     <tr>                            and create a row.
>   </dtml-if>
>
>    <td>                           # Create a column and
>       <dtml-var sequence-number>    insert the image or text
>    </td>
>
>   <dtml-if sequence-even>         # Close the table if even
>      </tr> 
>   </dtml-if>
>
>   </dtml-in> 
></table> 
>
>When I ran this code, I noticed that in the first iteration, when the
>sequence-number is 1, the condition <dtml-if sequence-odd> is not
>satisfied while the <dtml-if sequence-even> is! So the first few lines
>of the generated HTML would appear like this. Notice that the 1 column
>(<td></td>) is created first before the row.
>
><table width=100% border=1>
>
>    <td> 
>       1
>    </td>
>
>    </tr>         #
> 
>    <tr> 
>     :
>     :
>
>So, could somebody explain to me what is going on here.  Why can't Zope
>recognize the first iteration as an odd number, when the value of the
>sequence-number  is 1.  And why is the statement <dtml-if sequence-even>
>is satisfied at this point?
>
>Thanks.
>
>AL
>
>  
>