<!DOCTYPE HTML>
<html>
<style>
.droptarget {
width: 100px;
height: 35px;
padding: 10px;
border: 1px solid black;
}
</style>
<body>
<h1>HTML DOM Events</h1>
<h2>The ondragenter Event</h2>
<p>Drag the text up and down between the two rectangles:</p>
<div class="droptarget" ondrop="drop(event)" ondragenter="dragEnter(event)" ondragleave="dragLeave(event)" ondragover="allowDrop(event)">
<p ondragstart="dragStart(event)" draggable="true" id="dragtarget">Drag me!</p>
</div>
<br>
<div class="droptarget" ondragenter="dragEnter(event)" ondragleave="dragLeave(event)" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<p id="demo"></p>
<script>
function dragStart(event) {
event.dataTransfer.setData("Text", event.target.id);
}
function dragEnter(event) {
if (event.target.className == "droptarget") {
document.getElementById("demo").innerHTML = "Entered the dropzone";
event.target.style.backgroundColor = "lightblue";
}
}
function dragLeave(event) {
if (event.target.className == "droptarget") {
document.getElementById("demo").innerHTML = "Left the dropzone";
event.target.style.backgroundColor = "";
}
}