display error collapse accordion bootstrap - php

Question

I do a file explorer with symfony2 and Php 5.3 :)
I wanna display {{ Twig error }} when a directory is empty . Here my twig view :
<div class="accordion-group">
<div class="accordion-heading">
<a class="accordion-toggle" data-toggle="collapse" href=".mycollapse3">
<i class="fa fa-caret-square-o-right"></i> Tableaux de bord mensuels
</a>
</div>
{% for tab in tableauxliste %}
<div class="accordion-group">
{% if tableauxliste is empty %}
<div class="mycollapse3 collapse alert alert-info">
{{ erreur }}
</div>
<div class="accordion-heading mycollapse3 collapse">
<ul>
<a data-toggle="collapse" href="#collapse3{{ tab[0] }}">
{{ tab[0] }}
</a>
</ul>
{% endif %}
</div>
<div id="collapse3{{ tab[0] }}" class="accordion-body collapse">
<div class="accordion-inner">
{% if tab[0] is empty %}
<div class="alert alert-info">
{{ erreur }}
</div>
{% endif %}
{% for file in tab[1] %}
{% set repertoire = dir_tableaudebord ~ '/' ~ tab[0] %}
<ul><a target="_blank" href="{{ path('affiche', { 'repertoire':repertoire, 'file':file }) }}"><i class="fa fa-file-text-o"></i> {{ file | convert_encoding('UTF-8', 'Windows-1252') }}</a></ul>
{% endfor %}
</div>
</div>
</div>
{% endfor %}
</div>
In this case, the error isn't hidden and I don't know why.
I just wanna hide the error and display it after click on it.
Any ideas ? Thanks !

Answer 1

Add to you action some condition and return response (render this data's in template).
return $this->render(
'FolderBundle:To/you:template.html.twig',
[
'erreur' => $erreur
'tableauxliste' => $tableauxliste,
]
);
And use this variable in you template.