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XState - Simple Drag and Drop example

A simple implementation of drag-and-drop using XState. Based on this video by Fun Fun Function (R.I.P.). It adds some extra functionality, though:

  • Supports multiple draggable elements
  • Re-orders the z-index attribute based on the last dragged element
  • Nice animations for dragged elements

You can preview the final result on this project's GitHub pages.

How it works

The basic idea is:

  • Add event listeners on the document for mousedown, mousemove and mouseup events.
  • Delegate mousedown events for targets with both an id and the data-draggable custom attribute to XState.
  • XState saves a reference to the target element, and creates an entry on the context value draggables if it doesn't have one.
  • On mouseMove, we move set the element's top and left style attributes based on the current mouse position + the initial element position on mousedown.
  • On mousedown, we persist the dragged element's position on our draggables Map.

Running the project

This project uses Parcel for bundling. Clone this repository, open the folder on terminal and run npm start. Parcel will give you a nice local server that will watch and reload for every change you make.

Building

To build the project, run the build npm script using the command npm run build. The build will be found on the docs directory. Simple as that! ✨

Contact the author

If you have any questions about the code, the project, life or anything else, you can contact-me via e-mail or twitter.