html5 draggable hide original element

Since simply setting visibility: hidden doesn't work, I found another somewhat hacky solution: set visibility: hidden one millisecond after the drag event starts.

function startDrag(e) {
  setTimeout(function() {
    e.target.style.visibility = "hidden";
  }, 1);
}

function endDrag(e) {
  setTimeout(function() {
    e.target.style.visibility = "";
  }, 1);
}
body {
  display: inline-block;
  outline: 1px solid black;
}
.draggable {
  border-radius: 4px;
  background: #CC0000;
  width: 40px;
  height: 40px;
}
<div class="draggable" draggable="true" ondragstart="startDrag(event)" ondragend="endDrag(event)">

</div>

You may succeed this with a hacky solution. The native draggability doesn't allow CSS styles like: opacity:0;, visibility:hidden or display:none.

But you can do it using: transform:translateX(-9999px).

function startDrag(e) {
  let element = e.target;
  
  element.classList.add('hide');
}

function endDrag(e) {
  let element = e.srcElement;
  
  element.classList.remove('hide');
}
.draggable {
  border-radius: 4px;
  background: #CC0000;
  width: 40px;
  height: 40px;
}
.hide {
  transition: 0.01s;
  transform: translateX(-9999px);
}
<div
  class="draggable"
  draggable="true"
  ondragstart="startDrag(event)"
  ondragend="endDrag(event)"
/>

I've updated your JSFiddle with the solution.

[EDIT]:

Updated JSFiddle example with Andrew Hedges suggestion by using requestAnimationFrame instead setTimeout.

[EDIT 2]:

Updated with a better solution by Jason Yin adding transition CSS property instead using requestAnimationFrame, it moves the processing from scripting to rendering.

Tags:

Javascript

Html

Draggable

Html5 Draggable

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