For native HTML drag and drop, mark the source with draggable="true", place a value in event.dataTransfer during dragstart, cancel dragover on an eligible drop target, and handle the value in drop. Your code—not the browser—must validate the drop and update application state. Also provide a way to use the feature without dragging: WCAG 2.2 Success Criterion 2.5.7 requires a single-pointer alternative unless an exception applies.
Implement a basic native drag-and-drop interaction
This runnable example moves a task between two lists. It transfers a stable task ID rather than relying on a DOM node or passing an in-memory JavaScript object. On drop, it checks the ID and destination, updates the data model, and renders the lists from that model.
<ul id="todo" aria-label="To do">
<li draggable="true" data-id="task-42">Prepare release notes</li>
</ul>
<ul id="done" aria-label="Done"></ul>
<script>
const lists = {
todo: [{ id: 'task-42', text: 'Prepare release notes' }],
done: []
};
const payloadType = 'application/x-example-task-id';
const allowedDestinations = new Set(['todo', 'done']);
function render() {
for (const listName of Object.keys(lists)) {
const list = document.getElementById(listName);
list.replaceChildren();
for (const task of lists[listName]) {
const item = document.createElement('li');
item.textContent = task.text;
item.dataset.id = task.id;
item.draggable = true;
list.append(item);
}
}
}
document.addEventListener('dragstart', (event) => {
const item = event.target.closest('li[draggable="true"][data-id]');
if (!item) return;
event.dataTransfer.setData(payloadType, item.dataset.id);
event.dataTransfer.effectAllowed = 'move';
});
document.addEventListener('dragover', (event) => {
const target = event.target.closest('ul[id]');
if (!target || !allowedDestinations.has(target.id)) return;
event.preventDefault();
event.dataTransfer.dropEffect = 'move';
});
document.addEventListener('drop', (event) => {
const target = event.target.closest('ul[id]');
if (!target || !allowedDestinations.has(target.id)) return;
event.preventDefault();
const id = event.dataTransfer.getData(payloadType);
const sourceName = Object.keys(lists).find((name) =>
lists[name].some((task) => task.id === id)
);
if (!sourceName || sourceName === target.id) return;
const [task] = lists[sourceName].filter((entry) => entry.id === id);
lists[sourceName] = lists[sourceName].filter((entry) => entry.id !== id);
lists[target.id].push(task);
render();
});
render();
</script>Save this as an HTML file and open it in a browser. The example uses the browser’s native drag-and-drop events. Its in-memory arrays are demonstration state; a production application should update its own state store or persist the change as appropriate.
Understand the native drag event lifecycle
A typical operation starts at the draggable source, passes across potential targets, and ends at the source. The HTML Living Standard and MDN describe the event model in detail: WHATWG HTML Living Standard: Drag and drop, MDN: Drag operations.
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| Event | Where it occurs | Use it for |
|---|---|---|
dragstart |
Source | Set the permitted effect and transfer a stable identifier or serialized value. |
dragenter and dragleave |
Elements the dragged item enters or leaves | Optional visual feedback, such as highlighting a valid target. |
dragover |
Current potential target, repeatedly | Cancel the event on a valid target to opt into receiving a drop; optionally set the cursor effect. |
drop |
Accepted target | Read and validate the transferred value, then perform the application action. |
dragend |
Source | Clear temporary styling or state whether the operation succeeded or was canceled. |
Most elements do not accept drops by default. Cancel dragover only for targets that are valid in the current application context. The specification says dragenter should also be canceled, but MDN notes that browsers do not implement that requirement in practice. In the drop handler, prevent the default when the page is handling the drop. See MDN’s event guidance.
Use dragend for cleanup rather than assuming a successful drop: it fires when the drag completes whether it succeeded or was canceled. During a native drag, the browser suppresses device input events, so do not expect ordinary mouse or keyboard event handling to replace the drag event lifecycle.
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Transfer data safely and update application state
DataTransfer carries text or files; it does not pass arbitrary JavaScript object references between pages or applications. A common in-page pattern is to transfer a type-tagged string containing a stable record ID, look up that ID in current application state, and then apply the operation. The API overview is in MDN: HTML Drag and Drop API.
- Validate the payload: Treat transferred data as input. Check that the ID exists and that the current user and application rules permit the operation.
- Validate the destination: A destination that accepts one item or user may not accept another. Do not rely on a drop cursor or client-side identifier as authorization.
- Use application state as the source of truth: Change the model, then render the result. Directly moving DOM nodes alone can leave a framework’s state or persisted data unchanged.
- Choose the effect intentionally: Set
effectAllowedat the source, such asmove, and a compatibledropEffecton a valid target when useful.
For file drops, inspect the transferred file items and handle them as files rather than expecting an application-specific text ID. The details of data types and drag data are covered by MDN’s API overview.
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Make the interaction accessible without requiring a drag
Keyboard operation and a non-drag pointer alternative are separate needs. WCAG 2.2 Success Criterion 2.5.7 requires functionality operated by dragging to also work with a single pointer without dragging, unless dragging is essential or the user agent controls the functionality. See the WCAG 2.2 standard and W3C’s explanation of Dragging Movements.
Offer a one-click alternative
For a reorderable list, provide Move up and Move down buttons, or let a user select an item and then choose a destination. These approaches let someone complete the same task with a single pointer and no drag motion. WAI describes examples in technique G219.
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Support keyboard and assistive technology users
Ensure every action has a keyboard-accessible control as well as the non-drag pointer path. Make the action and its result understandable to assistive technology, and keep focus useful after a move—for example, retain focus on the moved item or its associated control. A drag-only feature is not made accessible merely by adding keyboard support if the separate single-pointer alternative is still absent.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose native drag and drop or a custom interaction
Native HTML drag and drop is a direct fit when the browser’s drag event model matches the task, such as accepting files or moving items between in-page targets. For sortable boards or touch-oriented interfaces, decide based on the devices and input methods the feature must support; the cited standards explain native behavior and accessibility criteria but do not establish that one implementation approach is universally best.
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- Check whether the required interaction works for the intended mouse, touch, and keyboard users.
- Plan a single-pointer alternative that does not require dragging.
- Decide how drop positioning and visual feedback should behave.
- Connect the gesture to application state and validate allowed moves.
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Quick Recap
Troubleshoot common problems
| Symptom | Likely cause | Fix |
|---|---|---|
| The drop handler never runs. | The target has not opted into accepting drops, or the handler is attached to a different element than the event reaches. | On eligible targets, call event.preventDefault() in dragover; use event delegation or attach handlers to the actual target. |
| The cursor indicates a drop, but nothing moves. | The browser reports an interaction; it does not update application data for you. | Read the expected payload in drop, validate it, update the model, and render or persist the new state. |
getData() returns an empty string or an unexpected value. |
The source and target may use different data types, the source did not set data, or the payload is not the expected text. | Set a consistent type in dragstart; read that same type in drop; reject missing or invalid IDs. |
| An item disappears, duplicates, or returns after rendering. | The DOM was manipulated without making the corresponding application-state change, or the move logic did not distinguish source and destination. | Move the record in the model, handle same-list drops deliberately, and render from the updated state. |
| Temporary highlight or drag state remains after cancellation. | Cleanup was tied only to the successful drop path. | Clear source-side temporary state in dragend, which also runs for canceled drags. |
| Users cannot complete the operation without dragging. | The interface offers no equivalent single-pointer path. | Add controls such as Move up/Move down or item selection followed by destination selection, and make the controls keyboard accessible. |
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