DragEvent: dataTransfer property

A DataTransfer object which contains the drag event's data.

The property can be null when the event is created using the constructor. It is never null when dispatched by the browser.

This example illustrates accessing the drag and drop data within the dragend event handler.

function processData(d) {
  // Process the data …
}

dragTarget.addEventListener(
  "dragend",
  (ev) => {
    // Call the drag and drop data processor
    if (ev.dataTransfer !== null) processData(ev.dataTransfer);
  },
  false,
);