Menú activo Adminlte 3 usando jQuery
// AdminLTe 3.0.x
/** 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');
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