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HTMLElement: dragenter event
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The dragenter event is fired when a dragged element or text selection enters a valid drop target. The target object is the immediate user selection (the element directly indicated by the user as the drop target), or the <body> element.
This event is cancelable and may bubble up to the Document and Window objects.
In this example, we have a draggable element inside a container. Try grabbing the element, dragging it over the other container, and releasing it.
We listen for the dragenter event to give the other container a purple background while the draggable element is over it to signal that the draggable element could be dropped onto the container.
However, in this partial example, we haven't implemented dropping: for a complete example of drag and drop, see the page for the drag event.
HTML
html
<div class="dropzone">
<div id="draggable" draggable="true">This div is draggable</div>
</div>
<div class="dropzone" id="drop-target"></div>
CSS
css
body {
/* Prevent the user from selecting text in the example */
user-select: none;
}
#draggable {
text-align: center;
background: white;
}
.dropzone {
width: 200px;
height: 20px;
background: blueviolet;
margin: 10px;
padding: 10px;
}
.dropzone.dragover {
background-color: purple;
}
JavaScript
js
const target = document.getElementById("drop-target");
target.addEventListener("dragenter", (event) => {
// highlight potential drop target when the draggable element enters it
if (event.target.classList.contains("dropzone")) {
event.target.classList.add("dragover");
}
});
target.addEventListener("dragleave", (event) => {
// reset background of potential drop target when the draggable element leaves it
if (event.target.classList.contains("dropzone")) {
event.target.classList.remove("dragover");
}
});
Result
- Other drag and drop events: