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//toggle between hiding and showing the dropdown content
function myFunction() {
    document.getElementById("myDropdown").classList.toggle("show");
}
// Closes dropdown
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {

var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}

// Sidebar Menu Script
$.sidebarMenu = function(menu) {
    var animationSpeed = 300;  
    $(menu).on('click', 'li a', function(e) {
      var $this = $(this);
      var checkElement = $this.next();
      if (checkElement.is('.treeview-menu') && checkElement.is(':visible')) {
        checkElement.slideUp(animationSpeed, function() {
          checkElement.removeClass('menu-open');
        });
        checkElement.parent("li").removeClass("active");
      }

//If the menu is not visible
      else if ((checkElement.is('.treeview-menu')) && (!checkElement.is(':visible'))) {
          //Get the parent menu
          var parent = $this.parents('ul').first();
          //Close all open menus within the parent
          var ul = parent.find('ul:visible').slideUp(animationSpeed);
          //Remove the menu-open class from the parent
          ul.removeClass('menu-open');
          //Get the parent li
          var parent_li = $this.parent("li");
          //Open the target menu and add the menu-open class
          checkElement.slideDown(animationSpeed, function() {
          //Add the class active to the parent li
          checkElement.addClass('menu-open');
          parent.find('li.active').removeClass('active');
          parent_li.addClass('active');
          });
      }
      //if this isn't a link, prevent the page from being redirected
      if (checkElement.is('.treeview-menu')) {
        e.preventDefault();
      }
    });
}
$.sidebarMenu($('.sidebar-menu'))

Editing File: dashbord-mobile-menu.js