Document: dragstart event
The dragstart
event is fired when the user starts dragging an element or text selection.
Bubbles | Yes |
---|---|
Cancelable | Yes |
Default action | Initiate the drag-and-drop operation. |
Interface | DragEvent |
Event handler property | ondragstart |
Examples
Setting opacity on drag start
In this example, we have a draggable element inside a container. Try grabbing the element, dragging it, and then releasing it.
We listen for the dragstart
event to make the element half transparent while it is being dragged.
For a more complete example of drag and drop, see the page for the drag
event.
HTML
<div id="container">
<div id="draggable" draggable="true">
This div is draggable
</div>
</div>
<div class="dropzone"></div>
CSS
body {
/* Prevent the user selecting text in the example */
user-select: none;
}
#draggable {
text-align: center;
background: white;
}
#container {
width: 200px;
height: 20px;
background: blueviolet;
padding: 10px;
}
.dragging {
opacity: .5;
}
JavaScript
document.addEventListener("dragstart", event => {
// make it half transparent
event.target.classList.add("dragging");
});
document.addEventListener("dragend", event => {
// reset the transparency
event.target.classList.remove("dragging");
});
Result
Specifications
Specification |
---|
HTML Standard # event-dnd-dragstart |
Browser compatibility
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