bootstrap dropdown not working second time code example

Example 1: bootstrap dropdown going off page

<!--add  dropdown-menu-right class to the dropdown-menu -->
<div class="dropdown-menu dropdown-menu-right">

Example 2: bootstrap dropdown toggle show until closed

// Prevents menu from closing when clicked inside 
        document.getElementById("Dropdown").addEventListener('click', function (event) { 
            alert("click outside"); 
            event.stopPropagation(); 
        });