JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="ul">
    <li contextmenu='rmenu' id="1" name='1'>eins</li>
    <li contextmenu='rmenu' name='2'>zwei</li>
    <li contextmenu='rmenu' name='3'>drei</li>
    <li contextmenu='rmenu' name='4'>vier</li>
</ul>
<menu type="context" id="rmenu">
    <menuitem label="bearbeiten" class="s_class" id="s_e">
    </menuitem>
    
    <menuitem label="l&ouml;schen" class="s_class" id="s_d">
    </menuitem>
</menu>

JavaScript

var lastClick = false;
$(document).ready(function(){
  document.ul = function(e){
    lastClick = e.target.id;
  }
});

$(".s_class").click(function() {
    alert(lastClick+" geklickt");
})