drag-and-drop
Implement drag-and-drop in LWC using HTML5 Drag and Drop API, keyboard alternatives, and accessible announcements. NOT for kanban migration from legacy Lightning.
Best use case
drag-and-drop is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Implement drag-and-drop in LWC using HTML5 Drag and Drop API, keyboard alternatives, and accessible announcements. NOT for kanban migration from legacy Lightning.
Teams using drag-and-drop should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/drag-and-drop/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How drag-and-drop Compares
| Feature / Agent | drag-and-drop | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Implement drag-and-drop in LWC using HTML5 Drag and Drop API, keyboard alternatives, and accessible announcements. NOT for kanban migration from legacy Lightning.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# LWC Drag and Drop
Native HTML5 Drag and Drop works in LWC — no library needed. The tricky parts are (1) preventing default on dragover, (2) carrying item identity via dataTransfer, and (3) providing a keyboard-accessible alternative (focus + arrow keys). This skill lays out the template, the JS handlers, and the ARIA live-region announcements.
## Adoption Signals
Any reordering UI (priority list, board columns, file drop zones). Not for complex trees (use a specialized library behind an LWC wrapper).
- HTML5 Drag and Drop API for in-component reordering — no third-party library required.
- Custom drag handles when the list rows contain interactive controls that must keep their own click semantics.
## Recommended Workflow
1. Template: add `draggable="true"`, `@dragstart`, `@dragover` (with preventDefault), `@drop` on source/target elements.
2. Pass identity via `event.dataTransfer.setData('text/plain', itemId)`.
3. Keyboard alternative: `@keydown` on item, arrow keys reorder with the same handler logic.
4. Announce drag start/drop via a `role="status"` aria-live region.
5. Jest test: simulate dragstart/drop; assert reorder + announcement.
## Key Considerations
- `dragover` must call `event.preventDefault()` or `drop` never fires.
- Touch devices don't fire drag events — detect and show reorder buttons.
- dataTransfer is cleared after drop — capture any data synchronously in dragstart.
- aria-grabbed is deprecated; announce via live region instead.
## Worked Examples (see `references/examples.md`)
- *Priority list reorder* — Case priority list
- *File drop zone* — Attachments upload
## Common Gotchas (see `references/gotchas.md`)
- **Missing preventDefault** — Drop never fires; silent bug.
- **Touch devices** — Mobile users can't reorder.
- **No keyboard path** — A11y audit fails.
## Top LLM Anti-Patterns (full list in `references/llm-anti-patterns.md`)
- Using an external drag library for simple lists
- Skipping keyboard support
- No aria-live announcement
## Official Sources Used
- Lightning Web Components Developer Guide — https://developer.salesforce.com/docs/platform/lwc/guide/
- Lightning Data Service — https://developer.salesforce.com/docs/platform/lwc/guide/data-wire-service-about.html
- LWC Recipes — https://github.com/trailheadapps/lwc-recipes
- SLDS 2 — https://www.lightningdesignsystem.com/2e/Related Skills
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