dragstart
L'événement dragstart est déclenché lorsque l'utilisateur glisse un élément ou une sélection de texte.
Informations générales
Properties
Property | Type | Description |
---|---|---|
target Lecture seule |
EventTarget |
The element that was underneath the element being dragged. |
type Lecture seule |
DOMString |
The type of event. |
bubbles Lecture seule |
Boolean (en-US) |
Whether the event normally bubbles or not |
cancelable Lecture seule |
Boolean (en-US) |
Whether the event is cancellable or not? |
view Lecture seule |
WindowProxy |
document.defaultView (window of the document) |
detail Lecture seule |
long (float ) |
0. |
dataTransfer |
DataTransfer | The data that underlies a drag-and-drop operation, known as the drag data store. Protected mode. |
currentTarget Lecture seule |
EventTarget | The node that had the event listener attached. |
relatedTarget Lecture seule |
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 Lecture seule |
long | The X coordinate of the mouse pointer in global (screen) coordinates. |
screenY Lecture seule |
long | The Y coordinate of the mouse pointer in global (screen) coordinates. |
clientX Lecture seule |
long | The X coordinate of the mouse pointer in local (DOM content) coordinates. |
clientY Lecture seule |
long | The Y coordinate of the mouse pointer in local (DOM content) coordinates. |
button Lecture seule |
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 Lecture seule |
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 Lecture seule |
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 Lecture seule |
boolean | true if the control key was down when the event was fired. false otherwise. |
shiftKey Lecture seule |
boolean | true if the shift key was down when the event was fired. false otherwise. |
altKey Lecture seule |
boolean | true if the alt key was down when the event was fired. false otherwise. |
metaKey Lecture seule |
boolean | true if the meta key was down when the event was fired. false otherwise. |
Exemple : dropzone
HTML Content
<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>
CSS Content
#draggable {
width: 200px;
height: 20px;
text-align: center;
background: white;
}
.dropzone {
width: 200px;
height: 20px;
background: blueviolet;
margin-bottom: 10px;
padding: 10px;
}
JavaScript Content
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);
Spécifications
Specification |
---|
HTML Standard # ix-handler-ondragstart |
HTML Standard # event-dnd-dragstart |
Compatibilité des navigateurs
BCD tables only load in the browser