HTML DOM ondragenter Event

Last Updated : 22 Jun, 2023

The HTML DOM ondragenter Event occurs when a draggable element enter in valid drop target. The ondragenter and ondragleave events can help the user to understand the dropzone.

There are some events that are used and occurred in the different stages of a drag and drop operation:

ondragstart: occurs when dragging of an element started.
ondrag: occurs while an element is dragging.
ondragend: occurs when dragging of an element finished.
ondragenter: occurs when the dragged element entered into the drop target.
ondragover: occurs when the dragged element is over the drop target.
ondragleave: occurs when the dragged element leaves from the drop target.
ondrop: occurs when the dragged element is dropped on the drop target.

Supported Tags: It supports all HTML elements.

Syntax:

In HTML:

<element ondragenter="myScript">

In JavaScript:

object.ondragenter = function(){myScript};

In JavaScript, using the addEventListener() method:

object.addEventListener("dragenter", myScript);

Example 1: In this example, we will see the use of DOM ondragenter Event

HTML

<!DOCTYPE HTML>
<html>
 
<head>
    <title>
        HTML DOM ondrop Event
    </title>
    <style>
        .droptarget {
            float: center;
            width: 300px;
            height: 50px;
            margin: 20px;
            padding: 5px;
            border: 6px solid green;
        }
    </style>
</head>
 
<body>
    <center>
        <h1 style="color:green">
            GeeksforGeeks
        </h1>
        <h2>HTML DOM ondrop Event</h2>
 
        <div class="droptarget"
             ondrop="Eledrop(event)"
             ondragenter="EledragEnter(event)"
             ondragleave="EledragLeave(event)"
             ondragover="EleallowDrop(event)">
           
            <p ondragstart="EledragStart(event)"
               draggable="true" id="dragtarget">
                Dragable element
            </p>
        </div>
 
        <div class="droptarget"
             ondragenter="EledragEnter(event)"
             ondragleave="EledragLeave(event)"
             ondrop="Eledrop(event)"
             ondragover="EleallowDrop(event)">
        </div>
        <p id="demo"></p>
 
        <script>
            function EledragStart(event) {
                event.dataTransfer.setData(
                  "Text", event.target.id);
            }
            function EledragEnter(event) {
                if (event.target.className == "droptarget") {
                    document.getElementById(
                        "demo").innerHTML = 
                      "Entered the dropzone";
                    event.target.style.border = 
                      "6px dotted red";
                }
            }
 
            function EledragLeave(event) {
                if (event.target.className == "droptarget") {
                    document.getElementById(
                        "demo").innerHTML = 
                      "Left the dropzone";
                    event.target.style.border = "";
                }
            }
 
            function EleallowDrop(event) {
                event.preventDefault();
            }
 
            function Eledrop(event) {
                event.preventDefault();
                let data = 
                    event.dataTransfer.getData("Text");
                event.target.appendChild(
                    document.getElementById(data));
            }
        </script>
    </center>
</body>
 
</html>

Output:

Example 2: In this example, we will see the use of Javascript.

html

<!DOCTYPE HTML>
<html>
 
<head>
    <title>
        HTML DOM ondrop Event
    </title>
    <style>
        .droptarget {
            float: center;
            width: 300px;
            height: 50px;
            margin: 20px;
            padding: 5px;
            border: 6px solid green;
        }
    </style>
</head>
 
<body>
    <center>
        <h1 style="color:green">
            GeeksforGeeks
        </h1>
        <h2>HTML DOM ondrop Event</h2>
 
        <div class="droptarget">
            <p draggable="true" id="dragtarget">
                Draggable Element
            </p>
        </div>
        <div class="droptarget"></div>
        <p id="demo"></p>
 
        <script>
            // Event fired on the drag target
            document.ondragstart = function (event) {
                event.dataTransfer.setData(
                  "Text", event.target.id);
            };
 
            // Events fired on the drop target
            document.ondragenter = 
                function (event) {
                if (event.target.className == "droptarget") {
                    document.getElementById(
                        "demo").innerHTML = 
                        "Entered the dropzone";
                    event.target.style.backgroundColor = 
                        "yellow";
                }
            };
 
            document.ondragover = function (event) {
                event.preventDefault();
            };
 
            document.ondragleave = function (event) {
                if (event.target.className == "droptarget") {
                    document.getElementById(
                        "demo").innerHTML = 
                        "Left the dropzone";
                    event.target.style.backgroundColor = "";
                }
            };
 
            document.ondrop = function (event) {
                event.preventDefault();
                if (event.target.className == "droptarget") {
                    event.target.style.backgroundColor = "";
                   let data = 
                       event.dataTransfer.getData("Text");
                    event.target.appendChild(
                       document.getElementById(data));
                }
            };
        </script>
    </center>
</body>
 
</html>

Output:

Example 3: Using the addEventListener() method.

HTML

<!DOCTYPE HTML>
<html>
 
<head>
    <title>HTML DOM ondrop Event</title>
    <style>
        .droptarget {
            float: center;
            width: 300px;
            height: 50px;
            margin: 20px;
            padding: 5px;
            border: 6px solid green;
        }
    </style>
</head>
 
<body>
    <center>
        <h1 style="color:green">
            GeeksforGeeks
        </h1>
        <h2>HTML DOM ondrop Event</h2>
 
        <div class="droptarget">
            <p draggable="true" id="dragtarget">
                Draggable Element
            </p>
        </div>
        <div class="droptarget"></div>
        <p id="demo"></p>
 
        <script>
            document.addEventListener(
                "dragstart", function (event) {
                event.dataTransfer.setData(
                   "Text", event.target.id);
            });
 
            document.addEventListener("dragenter", function (event) {
                if (event.target.className == "droptarget") {
                    document.getElementById("demo").innerHTML =
                        "Entered the dropzone";
                    event.target.style.backgroundColor = 
                        "yellow";
                }
            });
 
            document.addEventListener(
                "dragover", function (event) {
                event.preventDefault();
            });
 
            document.addEventListener("dragleave", function (event) {
                if (event.target.className == "droptarget") {
                    document.getElementById(
                        "demo").innerHTML =
                        "Left the dropzone";
                    event.target.style.backgroundColor = "";
                }
            });
 
            document.addEventListener("drop", function (event) {
                event.preventDefault();
                if (event.target.className == "droptarget") {
                    event.target.style.backgroundColor = "";
                    let data = 
                        event.dataTransfer.getData("Text");
                    event.target.appendChild(
                        document.getElementById(data));
                }
            });
        </script>
    </center>
</body>
 
</html>