Sections invisible until window resize - css

Question

I cant get sections to work properly, they are invisible until a window resize.
foundation.css:2413 code at this line setting section-container to visibility:hidden
I copied the actual code but even examples doesnt work in that containing divs.
<div class="large-8 columns large-centered">
<form class="custom ajaxform" data-validate="parsley" method="post" action="formProcess">
<input type="hidden" name="formtype" value="test" >
<fieldset>
<legend>Test</legend>
<span class="icon24 icon-close"></span>
<h4><small>Test</small></h4>
<?= View::make('forms.header') ?>
<h4><small>Test</small></h4>
<div class="section-container tabs" data-section="tabs">
<section class="active">
<p class="title" data-section-title>Test</p>
<div class="content" data-section-content>
<div class="row">
<div class="large-4 columns">
<label>Test *</label>
<input type="text" name="test" data-required="true">
</div>
</div>
</div>
</section>
<section>
<p class="title" data-section-title>test Tab 2</p>
<div class="content" data-section-content>
<div class="row">
<div class="large-6 columns">
<label>Second *</label>
<input type="text" name="second" data-required="true">
</div>
</div>
</div>
</section>
</div>
<div class="row">
<div class="large-12 columns">
<button class="small radius button" style="float:right" type="submit">Submit</button>
</div>
</div>
</fieldset>
</form>
</div>

Answer 1

Probably because you were adding the sections programmatically. In that case, you need to force a resize, so that foundation will be triggered to draw them correctly.
I had the same problem, and after quick googling, this would solve it:
$('[data-section]').trigger('resize');

Answer 2

If a
<div>
is not visible then it may means that it doesn't have a well defines height and width. Then rendering a content is not meaningful. To avoid that flaw we have to add a height and width.
<div class="section-container tabs" data-section="tabs" style="height: 400px; width : 400px;"></div>
Mention your respective height and width.