JSFiddle - React, Tailwind, and code Playground

HTML

<div id="widget_update">
    <div id="Fahrzeuge" /><img src="/admin/images/arrow.png" alt="move" width="16" height="16" class="handle" />
        <table width="538" cellspacing="0" cellpadding="0" border="0" >
        <tr>
            <td id="fahrzeuge">

            </td>
        </tr>
    </table>
    </div>
    <div id="NEWS" /><img src="/admin/images/arrow.png" alt="move" width="16" height="16" class="handle" />
        <table width="538" cellspacing="0" cellpadding="0" border="0">
        <tr>
            <td id="news">          
            </td>
        </tr>
    </table>
    </div>
    </div>

JavaScript

$("#widget_update").sortable({      
      update : function(event, ui) {
		  var widget = $('#widget_update').sortable('serialize');
alert(ui.item[0].id);          
  		$.ajax({
	    type: "POST",
	    url: "ajax/dashboard.php",
	    dataType : 'json',
	    cache: false,
	    data: {'position' : ui.item.index(),'item':ui.item[0].id},
	    success: function(data){
	    	$('#widget').html(data.html);	    	 		    	
	    },
	    error: function(data){
	    	alert('Error');	    	
	    }
	  	});
      }
});