DragEvent

Das drag Event wird ausgelöst, wenn ein Element oder ein Text "gezogen" wird (alle paar hundert Millisekunden).

Allgemeine Informationen

Spezifikation
HTML5
Interface
DragEvent
Steigt auf
Ja
Abbrechbar
Ja
Ziel
Document, Element
Standard-Aktion
Mit der drag & drop Operation fortfahren.

Eigenschaften

Property Type Description
target Schreibgeschützt EventTarget The element that was underneath the element being dragged.
type Schreibgeschützt DOMString The type of event.
bubbles Schreibgeschützt Boolean Whether the event normally bubbles or not
cancelable Schreibgeschützt Boolean Whether the event is cancellable or not?
view Schreibgeschützt WindowProxy document.defaultView (window of the document)
detail Schreibgeschützt long (float) 0.
dataTransfer DataTransfer The data that underlies a drag-and-drop operation, known as the drag data store. Protected mode.
currentTarget Schreibgeschützt EventTarget The node that had the event listener attached.
relatedTarget Schreibgeschützt EventTarget For mouseover, mouseout, mouseenter and mouseleave events: the target of the complementary event (the mouseleave target in the case of a mouseenter event). null otherwise.
screenX Schreibgeschützt long The X coordinate of the mouse pointer in global (screen) coordinates.
screenY Schreibgeschützt long The Y coordinate of the mouse pointer in global (screen) coordinates.
clientX Schreibgeschützt long The X coordinate of the mouse pointer in local (DOM content) coordinates.
clientY Schreibgeschützt long The Y coordinate of the mouse pointer in local (DOM content) coordinates.
button Schreibgeschützt unsigned short The button number that was pressed when the mouse event was fired: Left button=0, middle button=1 (if present), right button=2. For mice configured for left handed use in which the button actions are reversed the values are instead read from right to left.
buttons Schreibgeschützt unsigned short The buttons being pressed when the mouse event was fired: Left button=1, Right button=2, Middle (wheel) button=4, 4th button (typically, "Browser Back" button)=8, 5th button (typically, "Browser Forward" button)=16. If two or more buttons are pressed, returns the logical sum of the values. E.g., if Left button and Right button are pressed, returns 3 (=1 | 2). More info.
mozPressure Schreibgeschützt float The amount of pressure applied to a touch or tabdevice when generating the event; this value ranges between 0.0 (minimum pressure) and 1.0 (maximum pressure).
ctrlKey Schreibgeschützt boolean true if the control key was down when the event was fired. false otherwise.
shiftKey Schreibgeschützt boolean true if the shift key was down when the event was fired. false otherwise.
altKey Schreibgeschützt boolean true if the alt key was down when the event was fired. false otherwise.
metaKey Schreibgeschützt boolean true if the meta key was down when the event was fired. false otherwise.

Beispiel

<div class="dropzone">
    <div id="draggable" draggable="true" ondragstart="event.dataTransfer.setData('text/plain',null)">
        This div is draggable
    </div>
</div>
<div class="dropzone"></div>
<div class="dropzone"></div>
<div class="dropzone"></div>

<style>
  #draggable {
    width: 200px;
    height: 20px;
    text-align: center;
    background: white;
  }

  .dropzone {
    width: 200px;
    height: 20px;
    background: blueviolet;
    margin-bottom: 10px;
    padding: 10px;
  }
</style>

<script>
  var dragged;

  /* Event wird vom ge-drag-ten Element ausgelöst */
  document.addEventListener("drag", function( event ) {

  }, false);

  document.addEventListener("dragstart", function( event ) {
      // Speichern einer ref auf das drag-bare Element
      dragged = event.target;
      // Element halb-transparent machen
      event.target.style.opacity = .5;
  }, false);

  document.addEventListener("dragend", function( event ) {
      // Transparenz zurücksetzen
      event.target.style.opacity = "";
  }, false);

  /* events fired on the drop targets */
  document.addEventListener("dragover", function( event ) {
      // Standard-Aktion verhindern um das drop-Event zu erlauben
      event.preventDefault();
  }, false);

  document.addEventListener("dragenter", function( event ) {
      // Hintergrund des möglichen Drop-Zeils anfärben, wenn das drag-bare Element auf das Ziel gezogen wird
      if ( event.target.className == "dropzone" ) {
          event.target.style.background = "purple";
      }

  }, false);

  document.addEventListener("dragleave", function( event ) {
      // Hintergrund des möglichen Drop-Ziels, wenn das drag-bare Element vom Ziel wieder weggezogen wird / verlässt
      if ( event.target.className == "dropzone" ) {
          event.target.style.background = "";
      }
  }, false);

  document.addEventListener("drop", function( event ) {
      // Standard-Aktion verhindern (Bei einigen Elementen wäre das das Öffnen als Link)
      event.preventDefault();
      // move dragged elem to the selected drop target
      if ( event.target.className == "dropzone" ) {
          event.target.style.background = "";
          dragged.parentNode.removeChild( dragged );
          event.target.appendChild( dragged );
      }

  }, false);
</script>

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