activate treeview menu in adminlte 3.0.2 treeview-menu open
/** add active class and stay opened when selected */
var url = window.location;
// for sidebar menu entirely but not cover treeview
$('ul.nav-sidebar a').filter(function() {
return this.href == url;
}).addClass('active');
// for treeview
$('ul.nav-treeview a').filter(function() {
return this.href == url;
}).parentsUntil(".nav-sidebar > .nav-treeview").addClass('menu-open').prev('a').addClass('active');