HTMLElement: dragover event

The dragover event is fired when an element or text selection is being dragged over a valid drop target (every few hundred milliseconds).

The event is fired on the drop target(s).

Bubbles Yes
Cancelable Yes
Default action Reset the current drag operation to "none".
Interface DragEvent
Event handler property ondragover

Examples

A minimal drag and drop example

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 use three event handlers here:

  • in the dragstart event handler, we get a reference to the element that the user dragged
  • in the dragover event handler for the target container, we call event.preventDefault(), which enables it to receive drop events.
  • in the drop event handler for the drop zone, we handle moving the draggable element from the original container to the drop zone.

For a more 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="droptarget"></div>

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;
}

JavaScript

let dragged = null;

const source = document.getElementById("draggable");
source.addEventListener("dragstart", event => {
  // store a ref. on the dragged elem
  dragged = event.target;
});

const target = document.getElementById("droptarget");
target.addEventListener("dragover", event => {
  // prevent default to allow drop
  event.preventDefault();
});

target.addEventListener("drop", event => {
  // prevent default action (open as link for some elements)
  event.preventDefault();
  // move dragged element to the selected drop target
  if (event.target.className == "dropzone") {
    dragged.parentNode.removeChild(dragged);
    event.target.appendChild(dragged);
  }
});

Result

Specifications

No specification found

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Browser compatibility

No compatibility data found for api.HTMLElement.dragover_event.
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See also