Javascript DOM ondragenter Event handle all drag and drop events

Introduction

A demonstration of ALL possible drag and drop events:

Drag the p element back and forth between the two rectangles:

View in separate window 

<!DOCTYPE HTML>
<html>
<head>
<style>
.droptarget {// w ww. ja va 2  s .  c om
  float: left;
  width: 100px;
  height: 35px;
  margin: 15px;
  padding: 10px;
  border: 1px solid #aaaaaa;
}
</style>
</head>
<body>
<div class="droptarget">
  <p draggable="true" id="dragtarget">Drag me!</p>
</div>

<div class="droptarget"></div>
<p id="demo"></p>

<script>
document.addEventListener("dragstart", function(event) {
  event.dataTransfer.setData("Text", event.target.id);
  document.getElementById("demo").innerHTML = "Started to drag the p element.";
  event.target.style.opacity = "0.4";
});

document.addEventListener("drag", function(event) {
  document.getElementById("demo").style.color = "red";
});

document.addEventListener("dragend", function(event) {
  document.getElementById("demo").innerHTML = "Finished dragging the p element.";
  event.target.style.opacity = "1";
});
document.addEventListener("dragenter", function(event) {
  if ( event.target.className == "droptarget" ) {
    event.target.style.border = "3px dotted red";
  }
});

document.addEventListener("dragover", function(event) {
  event.preventDefault();
});

document.addEventListener("dragleave", function(event) {
  if ( event.target.className == "droptarget" ) {
    event.target.style.border = "";
  }
});
document.addEventListener("drop", function(event) {
  event.preventDefault();
  if ( event.target.className == "droptarget" ) {
    document.getElementById("demo").style.color = "";
    event.target.style.border = "";
    var data = event.dataTransfer.getData("Text");
    event.target.appendChild(document.getElementById(data));
  }
});
</script>

</body>
</html>



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