ondragenter Event
Example
Call a function when a draggable element enters a drop target:
<div ondragenter="myFunction(event)"></div>
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More examples below.
Description
The ondragenter event occurs when a draggable selection enters a drop target.
The ondragenter and ondragleave events
can help a user to better understand when a draggable is over the drop target.
For example, by setting a background color when a draggable element enters the
drop target, and removing the color when the element is moved out of the target.
Drag and drop is a common feature in HTML. It is when you "grab" an object and drag it to a different location.
To make an element draggable, use The draggable Attribute.
For more information, see the HTML Drag and Drop Tutorial.
Links and images are draggable by default, and do not need the draggable attribute.
Many events occur in the different stages of a drag and drop operation (see below):
Drag Events
On the Draggable Element:
| Event | Occurs When |
|---|---|
| ondrag | An element is being dragged |
| ondragstart | The user starts to drag an element |
| ondragend | The user has finished dragging an element |
Note: While dragging an element, the ondrag event fires every 350 milliseconds.
On the Drop Target:
| Event | Occurs When |
|---|---|
| ondragenter | A dragged element enters the drop target |
| ondragleave | A dragged element leaves the drop target |
| ondragover | A dragged element is over the drop target |
| ondrop | A dragged element is dropped on the target |
See Also:
The Drag Event Object
The draggable Attribute
Tutorial:
Syntax
In JavaScript, using the addEventListener() method:
object.addEventListener("dragenter", myScript);
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Technical Details
| Bubbles: | Yes |
|---|---|
| Cancelable: | Yes |
| Event type: | DragEvent |
| HTML tags: | All HTML elements |
| DOM Version: | Level 3 Events |
More Examples
Example
A demonstration of ALL possible drag and drop events:
<p draggable="true" id="dragtarget">Drag me!</p>
<div class="droptarget">Drop here!</div>
<script>
// Events fired on the drag target
document.addEventListener("dragstart", function(event) {
// The dataTransfer.setData() method sets the data type and the value of the dragged data
event.dataTransfer.setData("Text", event.target.id);
// Output some text when starting to drag the p element
document.getElementById("demo").innerHTML = "Started to drag the p element.";
// Change the opacity of the draggable element
event.target.style.opacity = "0.4";
});
// While dragging the p element, change the color of the output text
document.addEventListener("drag", function(event) {
document.getElementById("demo").style.color = "red";
});
// Output some text when finished dragging the p element and reset the opacity
document.addEventListener("dragend", function(event) {
document.getElementById("demo").innerHTML = "Finished dragging the p element.";
event.target.style.opacity = "1";
});
// Events fired on the drop target
// When the draggable p element enters the droptarget, change the DIVS's border style
document.addEventListener("dragenter", function(event) {
if ( event.target.className == "droptarget" ) {
event.target.style.border = "3px dotted red";
}
});
// By default, data/elements cannot be dropped in other elements. To allow a drop, we must prevent the default handling of the element
document.addEventListener("dragover", function(event) {
event.preventDefault();
});
// When the draggable p element leaves the droptarget, reset the DIVS's border style
document.addEventListener("dragleave", function(event) {
if ( event.target.className == "droptarget" ) {
event.target.style.border = "";
}
});
/* On drop - Prevent the browser default handling of the data (default is open as link on drop)
Reset the color of the output text and DIV's border color
Get the dragged data with the dataTransfer.getData() method
The dragged data is the id of the dragged element ("drag1")
Append the dragged element into the drop element
*/
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>
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Browser Support
ondragenter is a DOM Level 3 (2004) feature.
It is fully supported in all modern browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | 11 |
