Bootstrap navbar collapse after link click

Question

I have a boostrap nav menu where the 'Our projects' section is collapsable. When I click a link in the collapsable nav it collapse. However, I would like this to remain open, and collapse (hide) only once a different li is clicked (like "About", "Contact", etc).

Here's the code:

<ul class="nav masthead-nav" >
        <li class="active" >
          <a href="{% url 'home' %}" >Home page</a>
        </li>
        <li>
          <a href="{% url 'offer' %}" >Offer</a></li>
        <li>
          <a class="accordion-title" data-toggle="collapse" data-target="#projekty" href="#">
            Our Projects
          </a>
          <ul class="nav masthead-nav collapse " id="projekty" >
            <li>
              <a href="{%url 'mieszkaniowe' %}" >Appartments</a>
            </li>
            <li>
              <a href="{%url 'uzyteczne' %}" >Public</a>
            </li>
            <li>
              <a href="{%url 'wnetrza' %}" >Interior design</a>
            </li>
            <li>
              <a href="{%url 'biurowe' %}" >Office</a>
            </li>
            <li>
              <a href="{%url 'konkursy' %}" >Contest</a>
            </li>
            <li>
              <a href="{%url 'pozostale' %}">Others</a>
            </li>
          </ul>

          <li>
              <a href="{% url 'about' %}">About us</a>
          </li>
          <li>
             <a href="{% url 'contact' %}">Contact</a>
          </li>
      </ul>    

Answer 1

The difference between a submenu link is that the href points to '#', so I use the anti selector NOT as

$("nav a").not("a[href='#']").click(function(){
...

Answer 2

I know this is old but I just did this:

//close any open menus
    var arrOpenedDivs= document.querySelectorAll(".show");
    for (i = 0; i < arrOpenedDivs.length; i++) {
        arrOpenedDivs[i].classList.remove('show');
    }