ACTIVE NAVIGATION

Make Html Menu Dropdown Active, make Dropdown Title Active, when sub-item is selected using Css.

HTML

<section class="menu">
        <div class="container">
            <nav class="navbar navbar-default" role="navigation">
                <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                    <ul class="nav navbar-nav">
                        <li><a href="product.html">Product</a></li>
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">product management<strong class="caret"></strong></a>
                            <ul class="dropdown-menu">
                                <li><a href="#">Automated production equipment</a></li>
                                <li><a href="safetest.html">Finished product safety testing</a></li>
                            </ul>
                        </li>
                        <li><a href="certification.html">international certification </a></li>
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">R & D Center<strong class="caret"></strong></a>
                            <ul class="dropdown-menu">
                                <li><a href="dvl_process.html">development  process</a></li>
                                <li><a href="spec.html">check the specitions at raw materials</a></li>
                            </ul>
                        </li>
                        <li><a href="exhibition.html">Exhibition</a></li>
                        <li><a href="csr.html">CSR</a></li>
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown">About JBC<strong class="caret"></strong></a>
                            <ul class="dropdown-menu">
                                <li><a href="company.html">company</a></li>
                                <li><a href="location.html">location</a></li>
                                <li><a...

CSS

.active a {
    color: red;
}

JavaScript

$(document).ready(function() {
        $("#navigation li a").each(function() {
            if ($(this).prop("href") == window.location.href) {
                $(this).addClass("selected");
            }
        });
    });