HTML | DOM ondragover Event

The HTML DOM ondragover event occurs when a draggable element is being dragged over a valid dropzone.

Note: Links and images are draggable by default.

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



    Events fired on the draggable target:

  • ondragstart: occurs when dragging of an element started.
  • ondrag: occurs while an element is dragging.
  • ondragend: occurs when dragging of an element finished.
    Events fired on the drop target:

  • 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.

Note: the ondragover event fires every 350 milliseconds while dragging an element.

Syntax:

  • In HTML:
    <element ondragover="myScript">
  • In JavaScript:
    object.ondragover = function(){myScript};
  • In JavaScript, using the addEventListener() method:
    object.addEventListener("dragover", myScript);

Example: Using HTML.

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE HTML>
<html>
  
<head>
    <style>
        #droptarget {
            float: center;
            width: 300px;
            height: 50px;
            margin: 20px;
            margin-top: 30px;
            padding: 5px;
            border: 6px solid green;
        }
    </style>
</head>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <h2>
          HTML DOM ondragover Event
      </h2>
        <p ondragstart="dragStartEle(event)" 
           draggable="true" 
           id="dragtarget">
          Draggable element
      </p>
        
        <div id="droptarget" 
             ondrop="dropEle(event)" 
             ondragover="allowDropEle(event)">
        </div>
  
        <p id="try"></p>
  
        <script>
            function dragStartEle(event) {
                event.dataTransfer.setData(
                  "Text", event.target.id);
            }
  
            function allowDropEle(event) {
                event.preventDefault();
                document.getElementById(
                  "try").innerHTML = 
                  "Element is over the dropzone";
                event.target.style.border = "6px dotted green";
            }
  
            function dropEle(event) {
                event.preventDefault();
                var data = 
                    event.dataTransfer.getData("Text");
                
                event.target.appendChild(
                  document.getElementById(data));
                
                document.getElementById(
                  "try").innerHTML = "Dragging finished";
            }
        </script>
    </center>
</body>
  
</html>

chevron_right


Output:

Example: Using JavaScript

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE HTML>
<html>
  
<head>
    <style>
        #droptarget {
            float: center;
            width: 300px;
            height: 50px;
            margin: 20px;
            margin-top: 30px;
            padding: 5px;
            border: 6px solid green;
        }
    </style>
</head>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <h2>HTML DOM ondragover Event</h2>
        <p draggable="true" 
           id="dragtarget">
          Draggable element
      </p>
  
        <div id="droptarget"></div>
  
        <p id="demo"></p>
  
        <script>
            var drag = document.getElementById(
              "dragtarget");
            var drop = document.getElementById(
              "droptarget");
  
            // Events fired on the drag target 
            drag.ondragstart = function(event) {
                event.dataTransfer.setData(
                  "Text", event.target.id);
            };
  
            drag.ondrag = function(event) {
                document.getElementById(
                  "demo").innerHTML = 
                  "Dragging starts";
            };
  
            // Events fired on the drop target
            drop.ondragover = function(event) {
                event.preventDefault();
                document.getElementById(
                  "demo").innerHTML = 
                  "Element is over the dropzone";
                event.target.style.border =
                  "6px dotted green";
            };
  
            drop.ondrop = function(event) {
                event.preventDefault();
                var data = 
                    event.dataTransfer.getData("Text");
                event.target.appendChild(
                  document.getElementById(data));
                document.getElementById(
                  "demo").innerHTML = "Dragging finished";
            };
        </script>
    </center>
</body>
  
</html>

chevron_right


Output:

Example: Using the addEventListener() method

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE HTML>
<html>
  
<head>
    <style>
        #droptarget {
            float: center;
            width: 300px;
            height: 50px;
            margin: 20px;
            margin-top: 30px;
            padding: 5px;
            border: 6px solid green;
        }
    </style>
</head>
  
<body>
    <center>
        <h1 style="color:green">
          GeeksforGeeks
      </h1>
        <h2>HTML DOM ondragover Event</h2>
        <p draggable="true" id="dragtarget">
          Draggable element
      </p>
  
        <div id="droptarget"></div>
  
        <p id="try"></p>
  
        <script>
            var drag = document.getElementById(
              "dragtarget");
            var drop = document.getElementById(
              "droptarget");
  
            // Events fired on the drag target 
  
            drag.addEventListener(
              "dragstart", function(event) {
                event.dataTransfer.setData(
                  "Text", event.target.id);
            });
  
            drag.addEventListener(
              "drag", function(event) {
                document.getElementById(
                  "try").innerHTML = "Dragging starts";
            });
  
            // Events fired on the drop target 
            drop.addEventListener("dragover", function(event) {
                event.preventDefault();
                document.getElementById(
                  "try").innerHTML = "Element is over the dropzone";
                event.target.style.border = "6px dotted green";
            });
  
            drop.addEventListener("drop", function(event) {
                event.preventDefault();
                var data = event.dataTransfer.getData("Text");
                
                event.target.appendChild(
                  document.getElementById(data));
                
                document.getElementById(
                  "try").innerHTML = "Dragging finished";
            });
        </script>
    </center>
</body>
  
</html>

chevron_right


Output:

Supported Browsers: The browsers supported by HTML DOM ondragover Event are listed below:

  • Google Chrome 4.0
  • Internet Explorer 9.0
  • Firefox 3.5
  • Apple Safari 6.0
  • Opera 12.0


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :
Practice Tags :


Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.