Baseline Widely available
The DataTransfer.types read-only property returns the available types that exist in the items.
An array of the data formats. Each format is a string which is generally a MIME type such as text/plain or text/html. If the drag operation included no data, this list will be empty. If any files are included in the drag operation, then one of the types will be the string Files.
This example shows the use of the types and items properties.
<ul>
<li id="i1" draggable="true">Drag Item 1 to the Drop Zone</li>
<li id="i2" draggable="true">Drag Item 2 to the Drop Zone</li>
</ul>
<div id="target">Drop Zone</div>
<pre id="output"></pre>
div {
margin: 0em;
padding: 2em;
}
#target {
border: 1px solid black;
}
const output = document.getElementById("output");
function log(msg) {
output.textContent += `${msg}\n`;
}
document.querySelectorAll("li").forEach((item) => {
item.addEventListener("dragstart", dragstart_handler);
});
function dragstart_handler(ev) {
log(`dragStart: target.id = ${ev.target.id}`);
// Add this element's id to the drag payload so the drop handler will
// know which element to add to its tree
ev.dataTransfer.setData("text/plain", ev.target.id);
ev.dataTransfer.effectAllowed = "move";
}
const target = document.getElementById("target");
target.addEventListener("drop", (ev) => {
log(`drop: target.id = ${ev.target.id}`);
ev.preventDefault();
// Get the id of the target and add the moved element to the target's DOM
const data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
// Print each format type
for (let i = 0; i < ev.dataTransfer.types.length; i++) {
log(`⦠types[${i}] = ${ev.dataTransfer.types[i]}`);
}
// Print each item's "kind" and "type"
for (let i = 0; i < ev.dataTransfer.items.length; i++) {
log(
`⦠items[${i}].kind = ${ev.dataTransfer.items[i].kind}; type = ${ev.dataTransfer.items[i].type}`,
);
}
});
target.addEventListener("dragover", (ev) => {
ev.preventDefault();
ev.dataTransfer.dropEffect = "move";
});
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