The DataTransferItemList
method clear()
removes all DataTransferItem
objects from the drag data items list, leaving the list empty.
The drag data store in which this list is kept is only writable while handling the dragstart
event. While handling drop
, the drag data store is in read-only mode, and this method silently does nothing. No exception is thrown.
This example shows the use of the clear()
method.
HTML
<div>
<p id="source" ondragstart="dragstart_handler(event);" ondragend="dragend_handler(event);" draggable="true">
Select this element, drag it to the Drop Zone and then release the selection to move the element.</p>
</div>
<div id="target" ondrop="drop_handler(event);" ondragover="dragover_handler(event);">Drop Zone</div>
CSS
div {
margin: 0em;
padding: 2em;
}
#source {
color: blue;
border: 1px solid black;
}
#target {
border: 1px solid black;
}
JavaScript
function dragstart_handler(ev) {
console.log("dragStart");
var dataList = ev.dataTransfer.items;
dataList.add(ev.target.id, "text/plain");
dataList.add("<p>... paragraph ...</p>", "text/html");
dataList.add("http://www.example.org","text/uri-list");
}
function drop_handler(ev) {
console.log("Drop");
ev.preventDefault();
var data = event.dataTransfer.items;
for (var i = 0; i < data.length; i++) {
if ((data[i].kind == 'string') && (data[i].type.match('^text/plain'))) {
data[i].getAsString(function (s){
ev.target.appendChild(document.getElementById(s));
});
} else if ((data[i].kind == 'string') && (data[i].type.match('^text/html'))) {
data[i].getAsString(function (s){
console.log("... Drop: HTML = " + s);
});
} else if ((data[i].kind == 'string') && (data[i].type.match('^text/uri-list'))) {
data[i].getAsString(function (s){
console.log("... Drop: URI = " + s);
});
}
}
}
function dragover_handler(ev) {
console.log("dragOver");
ev.preventDefault();
ev.dataTransfer.dropEffect = "move"
}
function dragend_handler(ev) {
console.log("dragEnd");
var dataList = ev.dataTransfer.items;
for (var i = 0; i < dataList.length; i++) {
dataList.remove(i);
}
dataList.clear();
}
Result
Result link