Custom content with blocks

Hi,

for each page I want to output a table of contents which links to the articles on that same page.

Basically I'm following your tutorial "How do I create a FAQ?". The only difference is that the region I'm referring to contains blocks.

The problem: Instead of printing out a link for each article perch creates only an anchor tag for the first article. It has the correct href-attribute, but no anchor text.

My code looks like this:

index.php

<nav class="secondary">
    <ol>
        <?php perch_content_custom('Content', array('template'=>'navigation/secondary_item')); ?>
    </ol>
</nav>

<main>
    <?php perch_content('Content'); ?>
</main>

Content ist linked to blocks.html

<perch:blocks>
    <perch:block type="article" label="Artikel">
        <perch:template path="content/article.html" />
    </perch:block>

    <perch:block type="link_bars" label="Link-Liste (Balken)">
        <perch:template path="content/link_bars.html" />
    </perch:block>

    <perch:block type="interview" label="Interview">
        <perch:template path="content/interview.html" />
    </perch:block>
</perch:blocks>

Each template within blocks.html contains

<article id="article-<perch:content id="perch_item_index" type="hidden" />">
    <h4>
        <div class="category">
            <perch:content id="category" type="text" label="Rubrik" required="true" />
        </div>
    </h4>
[...]
</article>

navigation/secondary_item.html

<li>
    <a href='#article-<perch:content id="perch_item_index" type="hidden" />'>
        <perch:content id="category" type="text" label="Rubrik" required="true" />
    </a>
</li>