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I tried swapping two elements inside div1 and div2 tag but only the first replace function executes properly the other element is not swapped

  • either one of the div is getting swapped at once but when i try to swap both at same time it doesn't happen please help me out *

    <head>
    <style type="text/css">
        #div1 {
            width:350px;
            height:70px;
            padding:10px;
            border:1px solid #aaaaaa;
        }
        #div2 {
            width:350px;
            height:70px;
            padding:10px;
            border:1px solid #aaaaaa;
        }
    </style>
    <script>
        function allowDrop(ev) {
            ev.preventDefault();
        }

        function drag(ev) {
            var child = ev.target;
            var parents = child.parentNode;
            ev.dataTransfer.setData("child1", child.id);
            ev.dataTransfer.setData("parent1", parents.id);
        }

        function drop(ev) {
            ev.preventDefault();
            var childid1 = ev.dataTransfer.getData("child1");
            var parentid1 = ev.dataTransfer.getData("parent1");
            var parent1 = document.getElementById(parentid1);
            var c = ev.currentTarget.childNodes;
            var childid2 = c[1].id;
            parent1.replaceChild(c[1], document.getElementById(childid1));
            var parent2 = ev.currentTarget;
            parent2.removeChild(c[1]);
            parent2.appendChild(document.getElementById(childid1));
        }
    </script>
</head>

<body>
    <div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)">
        <img id="drag1" src="img_logo.gif" draggable="true" ondragstart="drag(event)" width="336" height="69">
    </div>
    <br>
    <div id="div2" ondrop="drop(event)" ondragover="allowDrop(event)">
        <img id="drag2" src="img_logo.gif" draggable="true" ondragstart="drag(event)" width="236" height="49">
    </div>
</body>

I tried swapping two elements inside div1 and div2 tag but only the first replace function executes properly the other element is not swapped

  • either one of the div is getting swapped at once but when i try to swap both at same time it doesn't happen please help me out *

    <head>
    <style type="text/css">
        #div1 {
            width:350px;
            height:70px;
            padding:10px;
            border:1px solid #aaaaaa;
        }
        #div2 {
            width:350px;
            height:70px;
            padding:10px;
            border:1px solid #aaaaaa;
        }
    </style>
    <script>
        function allowDrop(ev) {
            ev.preventDefault();
        }

        function drag(ev) {
            var child = ev.target;
            var parents = child.parentNode;
            ev.dataTransfer.setData("child1", child.id);
            ev.dataTransfer.setData("parent1", parents.id);
        }

        function drop(ev) {
            ev.preventDefault();
            var childid1 = ev.dataTransfer.getData("child1");
            var parentid1 = ev.dataTransfer.getData("parent1");
            var parent1 = document.getElementById(parentid1);
            var c = ev.currentTarget.childNodes;
            var childid2 = c[1].id;
            parent1.replaceChild(c[1], document.getElementById(childid1));
            var parent2 = ev.currentTarget;
            parent2.removeChild(c[1]);
            parent2.appendChild(document.getElementById(childid1));
        }
    </script>
</head>

<body>
    <div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)">
        <img id="drag1" src="img_logo.gif" draggable="true" ondragstart="drag(event)" width="336" height="69">
    </div>
    <br>
    <div id="div2" ondrop="drop(event)" ondragover="allowDrop(event)">
        <img id="drag2" src="img_logo.gif" draggable="true" ondragstart="drag(event)" width="236" height="49">
    </div>
</body>

  • javascript
  • dom
  • html
Share Improve this question edited May 28, 2013 at 6:47 Willem D'Haeseleer 20.2k10 gold badges68 silver badges103 bronze badges asked May 28, 2013 at 6:40 304696304696 391 gold badge1 silver badge2 bronze badges
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1 Answer 1

Reset to default 9

I think your fundamental flaw is that you do not cater for the fact that when you do your first replaceChild, the image you are inserting is removed from its parent so it is no longer there to replace with the second image.

I found your variable names somewhat confusing, and have rewritten your code in a simpler fashion as follows:

function allowDrop (ev) {
   ev.preventDefault ();
}

function drag (ev) {
  ev.dataTransfer.setData ("src", ev.target.id);
}

function drop (ev) {
  ev.preventDefault ();
  var src = document.getElementById (ev.dataTransfer.getData ("src"));
  var srcParent = src.parentNode;
  var tgt = ev.currentTarget.firstElementChild;

  ev.currentTarget.replaceChild (src, tgt);
  srcParent.appendChild (tgt);
}

You can test this code at jsFiddle

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