I saw many questions like mine but I can't write this JS.
I have a menu like this and I need to put the class="active" in the <li> tag of the page where the user is. This nav-bar is in a php file that I include in each page of the site. Sorry but after 28h of coding I am fuse!
<div class="componant-section" id="navbars">
<nav class="navbar navbar-inverse" role="navigation">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-collapse-2"><span class="fa fa-bars"></span></button>
<img class="logo" src="http://<?php echo $base_url ?>/images/logos.png" alt="" width="127">
</div>
<div class="collapse navbar-collapse" id="navbar-collapse-2">
<ul class="nav navbar-nav">
<li><a href="http://<?php echo $base_url ?>/home.php">Home</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Clienti <span class="fa-chevron-down fa"></span></a>
<ul class="dropdown-menu">
<div class="arrow top"></div>
<li><a href="http://<?php echo $base_url ?>/function/agg_cliente.php">Aggiungi nuovo...</a></li>
<li><a href="http://<?php echo $base_url ?>/lista_clienti.php">Lista</a></li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Fornitori <span class="fa-chevron-down fa"></span></a>
<ul class="dropdown-menu">
<div class="arrow top"></div>
<li><a href="http://<?php echo $base_url ?>/function/agg_fornitore.php">Aggiungi nuovo...</a></li>
<li><a href="http://<?php echo $base_url ?>/lista_fornitori.php">Lista</a></li>
</ul>
</li>
<li><a href="http://<?php echo $base_url ?>/fatture.php">Fatture</a></li>
<li><a href="http://<?php echo $base_url ?>/ddt.php">DDT</a></li>
<li><a href="http://<?php echo $base_url ?>/preventivi.php">Preventivi</a></li>
<li><a href="http://<?php echo $base_url ?>/ndc.php">NDC</a></li>
<li><a href="http://<?php echo $base_url ?>/listini.php">Listini</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Controllo <span class="fa-chevron-down fa"></span></a>
<ul class="dropdown-menu">
<div class="arrow top"></div>
<li><a href="http://<?php echo $base_url ?>/check/ck_login.php">Login</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_causale.php">Causale</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_mezzo.php">Mezzo Trasporto</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_iva.php">IVA</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_imb.php">Imballo</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_art.php">Articoli</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_spagg.php">Spese Aggiuntive</a></li>
<li><a href="http://<?php echo $base_url ?>/check/ck_pagam.php">Pagamento</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right navbar-icons">
<li><a><span class="fa-user fa"></span>
<span class="hidden-lg"><?php echo $user; ?></span></a></li>
<li><a href="http://<?php echo $base_url ?>/function/logout.php">
<span class="fa-cog fa"></span>
<span class="hidden-lg">Logout</span>
<span class="navbar-new"></span></a></li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</div>