获取点击的<li>的ID

Question

I have a dropdown list of items:

<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Räume <span class="caret"></span></a>
<ul class="dropdown-menu" id="Room">
  <!-- Auto-Generated: Dropdown content -->
</ul>

.. where the generated elements look like this:

<li class='LiRoom' id='Room 1'><a href='#'>R101</a></li>
<li class='LiRoom' id='Room 2'><a href='#'>R102</a></li>

.. and I want to display database entries on my website, depending on the selected <li> item's ID:

$(document).ready(function(){
  $("#Room").click(function() {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {
          document.getElementById('accordion').innerHTML = this.responseText;
      }
    };
    xmlhttp.open("GET", "GetRoomComponents.php?q=1", true);
    xmlhttp.send();
  });
});

The 1 of GetRoomComponents.php?q=1 needs to be replaced with the <li>'s ID. But how do I access the correct one?

This answer https://stackoverflow.com/a/3545356/5790966 (replacing "#Room" with "#Room li") didn't work. If I do that, the entire function doesn't execute (tested on the latest Chrome).

Answer 1

Since you are clicking on li a element, use it as click event in jQuery.

jQuery('#Room').on('click', 'li a', function() {
    var liId = jQuery(this).parent().attr('id').replace('Room ', ''); //Read ID of current pressed LI:

    console.log(liId); Prints either 1 or 2
});