HTMLElement: dragenter event

{{APIRef}}

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 {{HTMLElement("body")}} element.

This event is cancelable and may bubble up to the {{domxref("Document")}} and {{domxref("Window")}} objects.

Syntax

Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}} , or set an event handler property.

addEventListener("dragenter", (event) => {});

ondragenter = (event) => {};

Event type

A {{domxref("DragEvent")}} . Inherits from {{domxref("Event")}} .

{{InheritanceDiagram("DragEvent")}}

Event properties

In addition to the properties listed below, properties from the parent interface, {{domxref("Event")}} , are available.

{{domxref('DragEvent.dataTransfer')}} {{ReadOnlyInline}}
- : 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 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

<div class="dropzone">
  <div id="draggable" draggable="true">This div is draggable</div>
</div>
<div class="dropzone" id="drop-target"></div>

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

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

{{EmbedLiveSample('Styling drop zones on dragenter')}}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

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