html - bootrstrap side menu three levels collapsing -


i'm using sb admin bootstrap theme , have problems collapsing left side menu correctly.

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>  <div class="navbar-default sidebar" role="navigation">      <div class="sidebar-nav nav-collapse">          <ul class="nav" id="side-menu">              <li>                  <a href="#"><i class="fa fa-cog fa-fw"></i> top level 1 (this 1 collapses correctly)<span class="fa arrow"></span></a>                  <ul class="nav nav-second-level collapse">                      <li> second level 1</li>                      <li> second level 2</li>                  </ul>              </li>                <li>                  <a href="#"><i class="fa fa-cog fa-fw"></i> top level 2 (this 1 stays open)<span class="fa arrow"></span></a>                  <ul class="nav nav-second-level collapse">                      <li>                          <a href="#"><i class="fa fa-plus fa-fw"></i> second level 1<span class="fa arrow"></span></a>                          <ul class="nav nav-third-level collapse">                              <li>third level 1</li>                              <li>third level 2</li>                          </ul>                      </li>                      <li>                          <a href="#"><i class="fa fa-plus fa-fw"></i> second level 2<span class="fa arrow"></span></a>                          <ul class="nav nav-third-level collapse">                              <li>third level 1</li>                              <li>third level 2</li>                          </ul>                      </li>                  </ul>              </li>              <li>                  <a href="#"><i class="fa fa-cog fa-fw"></i> top level 3 (this 1 stays open)<span class="fa arrow"></span></a>                  <ul class="nav nav-second-level collapse">                      <li>                          <a href="#"><i class="fa fa-plus fa-fw"></i> second level 1<span class="fa arrow"></span></a>                          <ul class="nav nav-third-level collapse">                              <li>third level 1</li>                              <li>third level 2</li>                          </ul>                      </li>                      <li>                          <a href="#"><i class="fa fa-plus fa-fw"></i> second level 2<span class="fa arrow"></span></a>                          <ul class="nav nav-third-level collapse">                              <li>third level 1</li>                              <li>third level 2</li>                          </ul>                      </li>                  </ul>              </li>          </ul>      </div>  </div>

what want acheive when first load page menu should collapsed. when select subitem want menu load collapsed , open correct item. top menu item 1 sublevel collapses correctly. second , third top level first collapse (which ok) open (should stay closed unless subitem selected). third level works ok. correct combination of bootstrap collapse classes acheive correct function?


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