professional_javascript_for_web/ch16/SetDragImageExample01.htm

<!DOCTYPE html>
<html>
<head>
    <title>setDragImage() Example</title>
    <script src="EventUtil.js"></script>
</head>
<body>
    <p>Try dragging the blue square over to the red square. You should see a smiley face in Firefox, Safari, and Chrome.</p>
    <div id="dragme" draggable="true" style="-khtml-user-drag:element; width: 20px; height: 20px; background: blue"></div>
    <div style="width: 100px; height: 100px; float: right; background: red" id="droptarget"></div>
    <div id="output"></div>
    <script type="text/javascript">
        var droptarget = document.getElementById("droptarget"),
            dragme = document.getElementById("dragme"),
            img = new Image();
        img.src = "smile.gif";
        
        function handleEvent(event){
            document.getElementById("output").innerHTML += event.type + "<br>";
            switch(event.type){
                case "dragstart":
                    event.dataTransfer.setData("Text", "Yippee!");
                    event.dataTransfer.setDragImage(img, 25, 25);
                    break;
                case "dropenter":
                case "dragover":
                    EventUtil.preventDefault(event);
                    break;
                case "drop":
                case "dragdrop":
                    droptarget.innerHTML = event.dataTransfer.getData("Text");
                    EventUtil.preventDefault(event);
            }

        }

        EventUtil.addHandler(droptarget, "dragenter", handleEvent);
        EventUtil.addHandler(droptarget, "dragover", handleEvent);
        EventUtil.addHandler(droptarget, "dragleave", handleEvent);
        EventUtil.addHandler(droptarget, "drop", handleEvent);
        
        EventUtil.addHandler(dragme, "dragstart", handleEvent);


    </script>
</body>
</html>