css - html span could drag into its friends -


i have 2 divs both contains spans, want these spans drag , drop between these 2 divs , should not drop other elements, strangth thing these spans drop other span, i.e. if span inside dragable div, span can drop it. here codes:

<div class="row">     <div id="div1" ondrop="drop(event)" ondragover="allowdrop(event)" style=" background-color:#555;"></div>     <div id="div2" ondrop="drop(event)" ondragover="allowdrop(event)" style=" background-color:#bbb;">         <span id="drag1" draggable="true" ondragstart="drag(event)" style="background-color:#f00;">drag1</span>         <span id="drag2" draggable="true" ondragstart="drag(event)" style="background-color:#0f0;">drag2</span>         <span id="drag3" draggable="true" ondragstart="drag(event)" style="background-color:#00f;">drag3</span>     </div> </div> <style type="text/css">     .row div span {         display: block;         height: 30px;         float: left;         padding: 5px;         margin: 0 5px;         color: #fff;     }      .row div {         height: 40px;         margin: 5px;         padding: 5px;     } </style> <script type="text/javascript">     function allowdrop(ev) {         ev.preventdefault();     }      function drag(ev) {         ev.datatransfer.setdata("text", ev.target.id);     }      function drop(ev) {         ev.preventdefault();         var data = ev.datatransfer.getdata("text");         var id = document.getelementbyid(data);         ev.target.appendchild(id);         return data;     } </script>

and here running result: screenshot

as can see in pic, span "drag2" (green) has been droped "drag1" (red), not allowed us, spans should allowed drop parent divs, there way avoid that. thanks


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