Updating the ghost image for HTML5 drag and drop functionality

I am facing an issue with a large div element that is too big for my liking. I have come up with a solution to change it by implementing the following code:

<div draggable = "true" id = "ololo">
</div>
var k = document.getElementById("ololo");
k.addEventListener("dragstart", _drag, false);

function _drag(evt){
    var cl =  this.cloneNode(true);
    cl.style.backgroundColor = "blue";
    cl.style.width = "10px";
    cl.style.height = "10px";
    cl.style.position = "absolute";
    cl.style.left = "1000px";
    cl.style.overflow = "hidden";

    document.getElementsByTagName("body")[0].appendChild(cl);
    evt.dataTransfer.setDragImage(cl, 0, 0);

    window.setTimeout(function() {
       cl.parentNode.removeChild(cl);
    }, 1000);

}

Jsffidle demo This code works well, but I am unsure if it is suitable for production. I am also puzzled by the appearance of a scrollbar despite setting overflow to hidden. Can anyone provide insight on this issue?

javascriptcsshtml

Answer №1

One clever trick is to hide the clone behind the original draggable element using a z-index. To prevent unnecessary duplication in the DOM, you can then utilize the setTimeout() method to remove the clone after a specified time interval. Check out the demo to see it in action.

This approach is an enhancement of the tutorial available at kryogenix.org

Utilizes JS, CSS, HTML 

document.getElementById("drag-coveredup").addEventListener("dragstart", function(e) {
  var crt = this.cloneNode(true);
  crt.style.backgroundColor = "red";
  crt.style.height = "10px";
  crt.style.width = "10px";
  crt.style.position = "absolute";
  crt.style.top = "0";
  crt.style.left = "0";
  crt.style.zIndex = "-1";
  document.getElementById("drag-coveredup").appendChild(crt);
  e.dataTransfer.setDragImage(crt, 0, 0);

  window.setTimeout(function() {
    crt.parentNode.removeChild(crt);
  }, 1000);


}, false);
.dragdemo {
  width: 170px;
  height: 100px;
  position: relative;
  line-height: 100px;
  text-align: center;
  background: green;
  color: #efe;
}
<div id="drag-coveredup" class="dragdemo" draggable="true"></div>

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