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Making a looping block plugin

 
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Synchro
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Joined: 27 Apr 2008
Posts: 26

PostPosted: Tue Sep 17, 2013 9:03 am    Post subject: Making a looping block plugin Reply with quote

I'm looking to build some kind of block tag that loops over its contents, a bit like a foreach with parameters. One use for this is in rendering an RSS feed, I'd like a tag like this:

{rss url="http://..." items=5}
<h1>{$rss_item_title}</h1>
<p>{$rss_item_body}</p>
{/rss}

I'd have the outer block tag loop over its own contents and assign the values to the variables used inside it.

I have no problem making a block plugin, but I'm not sure how I could make it loop like that. I may just need a smack round the head of course.
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U.Tews
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Joined: 22 Nov 2006
Posts: 4507
Location: Hamburg / Germany

PostPosted: Tue Sep 17, 2013 8:03 pm    Post subject: Reply with quote

Some thing like this

Code:

function smarty_block_rss($params, $content, $template, &$repeat) {
if (is_null($content)) {
    // openening tag call
    static $items = $params['item'];
}
// assign your {$rss...} vars
.....
$items--;

if ($item) $repeat = true;
return $content;
}
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Synchro
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Joined: 27 Apr 2008
Posts: 26

PostPosted: Mon Oct 28, 2013 5:17 pm    Post subject: Reply with quote

So near yet so farů
I have the repeat calling mechanism working nicely, stepping through my RSS feed, but the problem is that $content is already rendered by the time the block plugin receives it, so assigning vars does nothing. The docs do actually say this:

Quote:
Note that the template block will have already been processed by Smarty, so all you will receive is the template output, not the template source.


This appears to be true: what I receive in $content has all smarty markup removed. The net result is that while this structure in the block plugin works, it achieves nothing because all smarty syntax is gone by the time it receives the content, so the changesd variables will never be displayed.

I'm not sure how this can be since there are block plugins that can be wrapped around other tags.

Is there something I missed?
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U.Tews
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Joined: 22 Nov 2006
Posts: 4507
Location: Hamburg / Germany

PostPosted: Mon Oct 28, 2013 6:47 pm    Post subject: Reply with quote

The plugin is called once with $content = null at the opening tag

Code:
{rss url="http://..." items=5}


after that it repeats rendering everything between opening and closing tag. The result is in $content. You will never see Smarty tags in $content.


Inside the plugin you must assign your variables with the assign() methode

Example
Code:
function smarty_block_rss($params, $content, $template, &$repeat) {
if (is_null($content)) {
    // opening tag call
    static $items = $params['item'];
}
// assign your {$rss...} vars
$template->assign('rss_item_body',$items);
$template->assign('rss_item_title',"tittle $items");

.....
$items--;

if ($item) $repeat = true;
return $content;
}
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Synchro
Smarty Rookie


Joined: 27 Apr 2008
Posts: 26

PostPosted: Mon Oct 28, 2013 8:12 pm    Post subject: Reply with quote

That's mostly what I was doing, but I found my problem. I was doing this:
Code:
$template->smarty->assign('rss_item_body',$items);

instead of
Code:
$template->assign('rss_item_body',$items);

Which is why it was coming out blank. I'd assumed that I needed to use the smarty instance, as function plugins use, rather than the template instance. Thanks for the fix.
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