If last item in iteration - do something else.

kaplag

Hi, I am looking to test an iw_iterate iteration count to the size/length/count of its list in order to apply a different pattern to the last item in the container.

 

My goal is to to make a Json formated list and I need to not have a comma at the end of the last one.

 

I know how to iterate, how to have a counter and how to do if/else logic in the iterator but I don't know how to get the length (or count or size) of the dcr container/"list". I'm working in a .tpl file so I'm using iw_iterate. 

 

I was thinking something like this:

 

<iw_iterate list="dcr.deals.sale_item" var="item" iteration="counter">
	<iw_if expr='  {iw_value name="$counter"/} le "(number of items in the $list - 1)" '  >
		<iw_then>
			{	
			something,
			something,
			something
			},
		</iw_then>
		<iw_else>
			{
			something,
			something,
			something
			}
		</iw_else>
	</iw_if>
</iw_iterate>

Unfortunalty I don't know perl (and don't really have time to learn it thurouhly right now) but if there was some kind of small script that I can use that would be great. The internet seems to say that getting the scalar of an array is the way to go but I don't understand how perl syntax works in context to an iterator.

 

Thanks,

Greg

kaplag

Ok I finally got it. So many little things can go wrong and I still don't know but maybe this will help someone else not waste a day. I was trying to test things on our server since we have a bug that prevents asp code from previewing so every attempt to test something took a couple minutes vs seconds.

 

Finally decided to strip the template down to only the logic in simple html.

 

here is my debug code:

 

<iw_perl>
	my $numOfItems = iwpt_dcr_list('dcr.deals.sale_item');
</iw_perl>
<iw_iterate list="dcr.deals.sale_item" var="item" iteration="counter">
	<iw_if expr='  {iw_value name="$counter"/} &lt; {iw_value name="( $numOfItems - 1 )"/}'  >
		<iw_then>
			{<br/>
			"Item count": "{iw_value name='$counter'/}",<br/>
			"Full count": "{iw_value name='($numOfItems - 1)'/}",<br/>
			"THEN"<br/>
			},<br/>
		</iw_then>
		<iw_else>
			{<br/>
			"Item count": "{iw_value name='$counter'/}",<br/>
			"Full count": "{iw_value name='($numOfItems - 1)'/}",<br/>
			"ELSE"<br/>
			}<br/>
		</iw_else>
	</iw_if>
</iw_iterate>

The hard part was learning that iwpt_dcr_list('dcr.content.name') will return the number of items in that list. Then I had to figure out you can save variables in little perl elements since trying to wrap it in an iw_value name would have too many quotes.... Then I had to figure out that you need to use < and not just lt like the document I was looking at was saying and that if you wrap an iw_value name in parenthesis you can do math operatons.

 

So yea... Fun night. Nothing like learning painfully.