drag and drop 20140526-1

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>drag & drop</title>
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<style>
div { width:200px; height:200px; margin:5px; border:1px solid #000; float:left;}
.drop { font-size:2em; text-align:center; line-height:200px;}
.clear { clear:both; }
</style>
</head>
<body>
<div id="red" class="drag"></div>
<div id="green" class="drag"></div>
<div id="blue" class="drag"></div>
<p class="clear"></p>
<div title="red" class="drop">red color</div>
<div title="green" class="drop">green color</div>
<div title="blue" class="drop">blue color</div>
<script>
$(".drag").each(
    function(){
      $(this).css("background-color",$(this).attr("id"));
    }
);
$(".drag").draggable({
 revert:true,
 start:function(){
  $(".drag").css("z-index",10);
  $(this).css("z-index",100);
  $(this).draggable( "option", "revert", true );
 }
});
$(".drop").droppable({
 drop:function(event, ui){
  var mytitle = $(this).attr("title");
  var dragid = ui.draggable.attr("id");
  if( mytitle ==dragid ) {
    ui.draggable.draggable( "option", "revert", false );
    var xy = $(this).offset();
    var x = xy.left + 1;
    var y = xy.top + 1;
    ui.draggable.offset({ top: y, left: x });
  }
 }
});
</script>
</body>
</html>