I know the `data-id` from the `li` element, but now i want the `id` value of the `li` element. How can I get this? Tried:

```
 var id = $('li[data-id="KnSubject[StId]"]').id;
 console.log(id); // UNDEFINED

```

Html Code: 

```
<li role="treeitem" data-jstree="{&quot;icon&quot; : &quot;glyphicon glyphicon-pencil&quot;}" data-id="KnSubject[StId]" data-values="null" aria-selected="true" aria-level="3" aria-labelledby="j1_4_anchor" id="j1_4" class="jstree-node  jstree-leaf"><i class="jstree-icon jstree-ocl" role="presentation"></i><a class="jstree-anchor jstree-clicked" href="#" tabindex="-1" id="j1_4_anchor"><i class="jstree-icon jstree-themeicon glyphicon glyphicon-pencil jstree-themeicon-custom" role="presentation"></i>Type dossieritem (StId)</a></li>

```