HTMLElement: dragenter event
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.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("dragenter", (event) => {});
ondragenter = (event) => {};
Event type
Event properties
In addition to the properties listed below, properties from the parent interface, Event
, are available.
DragEvent.dataTransfer
Read only-
The data that is transferred during a drag and drop interaction.
Examples
Styling drop zones on dragenter
In this example, we have a draggable element inside a container. Try grabbing the element, dragging it over the other container, and then 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 on to the container.
Note though that 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="droptarget"></div>
CSS
css
body {
/* Prevent the user 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("droptarget");
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
Specifications
Specification |
---|
HTML Standard # ix-handler-ondragenter |
HTML Standard # event-dnd-dragenter |
Browser compatibility
BCD tables only load in the browser