jQuery className don't work

Question

In these 2 examples the first one work the scond don't.

In the second example I bind dragover and dragleave events to img instead of div but I want to change className for div. The events are correctly detected and no error is raised but div does not change its class.

Where is the problem?

//This work

$(document).ready( function() {
    $("#framedrag").bind("dragover dragleave", function(e) {
        e.stopPropagation();
        e.preventDefault();
        e.target.className = (e.type == "dragover" ? "hover" : "");
        return false;
    });
});
   

//This don't work

$(document).ready( function() {
    $("#dragdrop").bind("dragover dragleave", function(e) {
        e.stopPropagation();
        e.preventDefault();
        $("#framedrag").className = (e.type == "dragover" ? "hover" : "");
        return false;
    });
});

#framedrag
{
  	color: #555;
  	border: 2px dashed #555;
  	border-radius: 7px;
  	cursor: default;
}

#framedrag.hover
{
  	color: #3fc600;
  	border-color: #3fc600;
  	border-style: solid;
}

<script     src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="preview-pane">
    <div id="framedrag">
        <div class="preview-container">
            <img id="dragdrop" src="images/upload-picture.png" class="jcrop-preview" />
        </div>
    </div>
</div>

Answer 1

Try this $("#framedrag").attr("class", e.type == "dragover" ? "hover" : "");