I am testing the .toggleClass, but in this accordion, you are not changing the icon from plus to minus when you click on the element:
function toggleIcon(e) {
$(e.target)
.prev('.panel-heading')
.find(".more-less")
.toggleClass('fa fa-plus fa fa-minus');
}
$('.panel-group').on('hidden.bs.collapse', toggleIcon);
$('.panel-group').on('shown.bs.collapse', toggleIcon); .panel-group .panel {
border-radius: 0;
box-shadow: none;
border-color: #EEEEEE;
}
.panel-default>.panel-heading {
padding: 0;
border-radius: 0;
color: #212121;
/* background-color: #FAFAFA;
border-color: #EEEEEE; */
}
.panel-title {
font-family: Roboto-Medium;
font-size: 20px;
color: #3d438b;
}
.panel-title>a {
display: block;
padding: 15px;
text-decoration: none;
line-height: 22px;
height: 74px;
}
.1_linha {}
.2_linha {}
.panel-title>a:hover,
.panel-title>a:focus {
color: #3d438b;
}
.more-less {
float: left;
color: #212121;
}
.panel-default>.panel-heading+.panel-collapse>.panel-body {
margin-bottom: 10px;
border: 1px solid #a6abd4;
}
.panel.panel-default {
background-color: #a6abd4;
border: 1px solid #a6abd4;
-webkit-border-radius: 8px;
-moz-border-radius: 8px;
border-radius: 8px;
margin-bottom: 10px;
}
/* ----- v CAN BE DELETED v ----- */
.demo {
padding-top: 60px;
padding-bottom: 60px;
}
.icones_accordion::before {
background-color: #3d438b;
left: 0px;
width: 40px;
height: 40px;
line-height: 40px;
display: inline-block;
font-weight: normal;
top: 0;
text-align: center;
color: #ffffff;
margin-right: 15px;
border-radius: 100%;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script><divclass="container demo">
<div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingOne">
<h4 class="panel-title 1_linha">
<a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de rearranjo envolvendo o gene MALT
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse show" role="tabpanel" aria-labelledby="headingOne">
<div class="panel-body detalhes_icones">
<span>Utilidade</span>:<br /> Diagnóstico de linfoma MALT.<br /><br />
<span>Material Requerido</span>:<br /> Tecido fixado em formalina e incluído em parafina (bloco de parafina) com neoplasia linfoide representada. Cópia do relatório do patologista.<br /><br />
<span>Metodologia</span>:<br /> Utiliza sondas de DNA dirigidas a sequências específicas do MALT1 e marcadas com moléculas fluorescentes.<br /><br />
<span>Transporte</span>:<br /> Pelo correio em temperatura ambiente (20-25ºC)<br /><br />
<span>Prazo De Entrega</span>:<br /> 7-10 dias úteis.<br /><br />
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingTwo">
<h4 class="panel-title 1_linha">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de rearranjo envolvendo o gene BCL2
</a>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="headingThree">
<h4 class="panel-title">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="false" aria-controls="collapseThree" class="
">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de amplificação do gene N-MYC - Neuroblastoma
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="heading4">
<h4 class="panel-title">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapse4" aria-expanded="false" aria-controls="collapse4">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de amplificação do gene EGFR (HER1)- Câncer de pulmão
</a>
</h4>
</div>
<div id="collapse4" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading4">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="heading5">
<h4 class="panel-title">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapse5" aria-expanded="false" aria-controls="collapse5">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de amplificação do gene HER2 - Câncer de mama e gástrico
</a>
</h4>
</div>
<div id="collapse5" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading5">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="heading6">
<h4 class="panel-title">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapse6" aria-expanded="false" aria-controls="collapse6">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de deleções envolvendo os cromossomos 1p e 19q- glioma/oligodendroglioma
</a>
</h4>
</div>
<div id="collapse6" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading6">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="heading7">
<h4 class="panel-title">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapse7" aria-expanded="false" aria-controls="collapse7">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de rearranjos envolvendo o gene EWS- sarcoma de Ewing/PNET
</a>
</h4>
</div>
<div id="collapse7" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading7">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading" role="tab" id="heading8">
<h4 class="panel-title">
<a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapse8" aria-expanded="false" aria-controls="collapse8">
<i class="icones_accordion more-less fa fa-plus"></i> Pesquisa de rearranjos envolvendo o gene SYT ou SS18- sarcoma sinovial
</a>
</h4>
</div>
<div id="collapse8" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading8">
<div class="panel-body detalhes_icones">
Simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard.
</div>
</div>
</div>
</div>
<!-- panel-group -->
</div>
<!-- container -->Apparently it's all right, but here it was a mistake that did not work.