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.
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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.
<!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> |
Output:
Example: Using JavaScript
<!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> |
Output:
Example: Using the addEventListener() method
<!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> |
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
