--- title: dragover slug: Web/API/Document/dragover_event translation_of: Web/API/Document/dragover_event ---
{{APIRef}}

L'événement dragover est déclenché lorsqu'un élément ou une sélection de texte est glissé jusqu'à une cible de dépôt valide (toutes les 100ms)

Informations générales

Interface
DragEvent
Propagation
Oui
Annulable
Oui
Cible
{{domxref("Document")}}, {{domxref("Element")}}
Action par défaut
Reset l'opération de glissement courante à "none"

Properties

Property Type Description
target {{readonlyInline}} EventTarget The element that was underneath the element being dragged.
type {{readonlyInline}} DOMString The type of event.
bubbles {{readonlyInline}} Boolean Whether the event normally bubbles or not
cancelable {{readonlyInline}} Boolean Whether the event is cancellable or not?
view {{readonlyInline}} WindowProxy document.defaultView (window of the document)
detail {{readonlyInline}} long (float) 0.
dataTransfer DataTransfer The data that underlies a drag-and-drop operation, known as the drag data store. Protected mode.
currentTarget {{readonlyInline}} EventTarget The node that had the event listener attached.
relatedTarget {{readonlyInline}} 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 {{readonlyInline}} long The X coordinate of the mouse pointer in global (screen) coordinates.
screenY {{readonlyInline}} long The Y coordinate of the mouse pointer in global (screen) coordinates.
clientX {{readonlyInline}} long The X coordinate of the mouse pointer in local (DOM content) coordinates.
clientY {{readonlyInline}} long The Y coordinate of the mouse pointer in local (DOM content) coordinates.
button {{readonlyInline}} 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 {{readonlyInline}} 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 {{readonlyInline}} 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 {{readonlyInline}} boolean true if the control key was down when the event was fired. false otherwise.
shiftKey {{readonlyInline}} boolean true if the shift key was down when the event was fired. false otherwise.
altKey {{readonlyInline}} boolean true if the alt key was down when the event was fired. false otherwise.
metaKey {{readonlyInline}} boolean true if the meta key was down when the event was fired. false otherwise.

Exemple

<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;

  /* Les événements sont déclenchés sur les objets glissables */
  document.addEventListener("drag", function( event ) {

  }, false);

  document.addEventListener("dragstart", function( event ) {
      // Stocke une référence sur l'objet glissable
      dragged = event.target;
      // transparence 50%
      event.target.style.opacity = .5;
  }, false);

  document.addEventListener("dragend", function( event ) {
      // reset de la transparence
      event.target.style.opacity = "";
  }, false);

  /* Les événements sont déclenchés sur les cibles du drop */
  document.addEventListener("dragover", function( event ) {
      // Empêche default d'autoriser le drop
      event.preventDefault();
  }, false);

  document.addEventListener("dragenter", function( event ) {
      // Met en surbrillance la cible de drop potentielle lorsque l'élément glissable y entre
      if ( event.target.className == "dropzone" ) {
          event.target.style.background = "purple";
      }

  }, false);

  document.addEventListener("dragleave", function( event ) {
      // reset de l'arrière-plan des potentielles cible du drop lorsque les éléments glissables les quittent 
      if ( event.target.className == "dropzone" ) {
          event.target.style.background = "";
      }

  }, false);

  document.addEventListener("drop", function( event ) {
      // Empêche l'action par défaut (ouvrir comme lien pour certains éléments)
      event.preventDefault();
      // Déplace l'élément traîné vers la cible du drop sélectionnée
      if ( event.target.className == "dropzone" ) {
          event.target.style.background = "";
          dragged.parentNode.removeChild( dragged );
          event.target.appendChild( dragged );
      }

  }, false);
</script>

Spécifications

Spécification Statut Commentaire
{{SpecName("HTML WHATWG", "interaction.html#dndevents", "dragover")}} {{Spec2("HTML WHATWG")}}  
{{SpecName("HTML5.1", "editing.html#dndevents", "dragover")}} {{Spec2("HTML5.1")}} Définition initiale

Compatibilités navigateur

{{Compat("api.Document.dragover_event")}}

Voir aussi