Limit Dragula Example

https://codecourse.com/forum/topics/drag-and-drop-list-images-with-a-clone-feature/189

HTML

<script src="https://rawgit.com/bevacqua/dragula/master/dist/dragula.min.js"></script>
<link rel="stylesheet" href="https://rawgit.com/bevacqua/dragula/master/dist/dragula.min.css">
<div class="container" id="colonne1">
    <div>One</div>
    <div>Two</div>
    <div>Three</div>
    <div>Four</div>
    <div>Five</div>
    <div>Six</div>
    <div>Seven</div>
</div>
<div class="container" id="colonne2"></div>
<div title="Move" onclick="javascript:moveBlock();">MOVE</div>
<div onclick="removeBlock();">REMOVE</div>
<script>
function moveBlock(){
    
   dragula([ document.getElementById('colonne1'), 	      	document.getElementById('colonne2')]);
}


function removeBlock(){
/*dragula([ document.getElementById('colonne1'), 	      	document.getElementById('colonne2')]).invalid();
*/
var drake = dragula([ document.getElementById('colonne1'), 	      	document.getElementById('colonne2')]);

drake.invalid;
}
</script>

CSS

.container {
    float: left;
    width: 48%;
    margin-right: 2%;
    padding: 10px;
    min-height: 300px;
    background-color: rgba(0, 0, 0, 0.2);
    transition: opacity 0.4s ease-in-out;
    cursor: move;
    cursor: grab;
    cursor: -moz-grab;
    cursor: -webkit-grab;
    box-sizing: border-box;
}
.container div {
    padding: 10px 15px;
    margin: 10px 0;
    background-color: rgba(0, 0, 0, 0.2);
}
}