react-draggable

What is react-draggable?

The react-draggable npm package allows React components to be draggable within the DOM. It provides a simple way to make elements draggable and offers various customization options such as grid snapping, axis locking, and event handling for drag actions.

What are react-draggable's main functionalities?

Basic Dragging

This code snippet enables basic dragging functionality for the enclosed <div> element.

{"<Draggable><div>I can be dragged</div></Draggable>"}

Controlled Draggable

This example shows a controlled component where the position is managed by the component's state, allowing for more complex interactions.

{"<Draggable position={this.state.position} onDrag={this.handleDrag}><div>I can be dragged</div></Draggable>"}

Axis Constraints

This code restricts the dragging movement to the horizontal axis.

{"<Draggable axis='x'><div>I can only be dragged horizontally</div></Draggable>"}

Grid Snapping

This snippet makes the element snap to a grid pattern as it's being dragged.

{"<Draggable grid={[25, 25]}><div>I snap to a 25x25 grid</div></Draggable>"}

Bounds Limitation

This code ensures that the draggable element cannot be moved outside the bounds of its parent container.

{"<Draggable bounds='parent'><div>I can't be dragged outside my parent</div></Draggable>"}

Other packages similar to react-draggable

react-beautiful-dnd

This package provides a higher level of abstraction for creating draggable and droppable interfaces, focusing on vertical and horizontal lists. It's more suitable for complex drag-and-drop interfaces, compared to react-draggable which is more low-level.

react-dnd

React DnD is a set of React utilities to help you build complex drag and drop interfaces while keeping your components decoupled. It is more comprehensive than react-draggable and uses the HTML5 drag and drop API.

react-sortable-hoc

This package provides components and higher-order components to make elements sortable via drag-and-drop. It's specifically designed for creating sortable lists and grids, unlike react-draggable which is for general-purpose dragging.

react-grid-layout

React Grid Layout is a grid layout system much like Packery or Gridster, for React. It allows users to create draggable and resizable layouts. It's more specialized for layout management compared to react-draggable which is for dragging elements.

README

React-Draggable

A simple component for making elements draggable.

View the Changelog

Demo

View Demo

Installing

$ npm install react-draggable

If you aren't using browserify/webpack, a UMD version of react-draggable is available. It is updated per-release only. This bundle is also what is loaded when installing from npm. It expects external React and ReactDOM.

If you want a UMD version of the latest master revision, you can generate it yourself from master by cloning this repository and running $ make. This will create umd dist files in the dist/ folder.

Draggable

A <Draggable> element wraps an existing element and extends it with new event handlers and styles. It does not create a wrapper element in the DOM.

Draggable items are moved using CSS Transforms. This allows items to be dragged regardless of their current positioning (relative, absolute, or static). Elements can also be moved between drags without incident.

If the item you are dragging already has a CSS Transform applied, it will be overwritten by <Draggable>. Use an intermediate wrapper (<Draggable><span>...</span></Draggable>) in this case.

Draggable API

The <Draggable/> component transparently adds draggable to whatever element is supplied as this.props.children. Note: Only a single element is allowed or an Error will be thrown.

For the <Draggable/> component to correctly attach itself to its child, the child element must provide support for the following props:

• style is used to give the transform css to the child.
• className is used to apply the proper classes to the object being dragged.
• onMouseDown is used along with onMouseUp to keep track of dragging state.
• onMouseUp is used along with onMouseDown to keep track of dragging state.
• onTouchStart is used along with onTouchEnd to keep track of dragging state.
• onTouchEnd is used along with onTouchStart to keep track of dragging state.

React.DOM elements support the above six properties by default, so you may use those elements as children without any changes. If you wish to use a React component you created, you might find this React page helpful.

Props:

{
// Called when dragging starts. If `false` is returned from this method,
// dragging will cancel.
// These callbacks are called with the arity:
// (event: Event,
//  {
//     position: {left: number, top: number},
//     deltaX: number,
//     deltaY: number
//  }
// )
onStart: Function,

// Called while dragging.
onDrag: Function,

// Called when dragging stops.
onStop: Function,

// Called whenever the user mouses down. Called regardless of handle or
//  disabled status.
onMouseDown: Function,

// Specifies the `x` and `y` that the dragged item should start at.
// This is generally not necessary to use (you can use absolute or relative
// positioning of the child directly), but can be helpful for uniformity in
// your callbacks and with css transforms.
start: {x: number, y: number},

// If true, will not call any drag handlers.
disabled: boolean,

// Specifies a selector to be used to prevent drag initialization.
// Example: '.body'
cancel: string,

// Specifies a selector to be used as the handle that initiates drag.
// Example: '.handle'
handle: string,

// If set to `true`, will allow dragging on non left-button clicks.
allowAnyClick: boolean,

// Determines which axis the draggable can move. Accepted values:
// - `both` allows movement horizontally and vertically (default).
// - `x` limits movement to horizontal axis.
// - `y` limits movement to vertical axis.
axis: string,

// Specifies movement boundaries. Accepted values:
// - `parent` restricts movement within the node's offsetParent
//    (nearest node with position relative or absolute), or
// - An object with `left, top, right, and bottom` properties.
//   These indicate how far in each direction the draggable
//   can be moved.
bounds: {left: number, top: number, right: number, bottom: number} | string,

// Specifies the x and y that dragging should snap to.
grid: [number, number],

// Specifies the zIndex to use while dragging.
zIndex: number
}

Note that sending className, style, or transform as properties will error - set them on the child element directly.

Draggable Usage

var React = require('react'),;
var ReactDOM = require('react-dom');
var Draggable = require('react-draggable');

var App = React.createClass({
	handleStart: function (event, ui) {
		console.log('Event: ', event);
		console.log('Position: ', ui.position);
	},

	handleDrag: function (event, ui) {
		console.log('Event: ', event);
    console.log('Position: ', ui.position);
	},

	handleStop: function (event, ui) {
		console.log('Event: ', event);
    console.log('Position: ', ui.position);
	},

	render: function () {
		return (
			<Draggable
				axis="x"
				handle=".handle"
				start={{x: 0, y: 0}}
				grid={[25, 25]}
				zIndex={100}
				onStart={this.handleStart}
				onDrag={this.handleDrag}
				onStop={this.handleStop}>
				<div>
					<div className="handle">Drag from here</div>
					<div>This readme is really dragging on...</div>
				</div>
			</Draggable>
		);
	}
});

ReactDOM.render(<App/>, document.body);

For users that require more control, a <DraggableCore> element is available. This is useful for more programmatic usage of the element. See React-Resizable and React-Grid-Layout for some examples of this.

<DraggableCore> is a useful building block for other libraries that simply want to abstract browser-specific quirks and receive callbacks when a user attempts to move an element. It does not set styles or transforms on itself.

DraggableCore API

<DraggableCore> takes all of the above <Draggable> options, with the exception of:

• axis
• bounds
• start
• zIndex

Drag callbacks are called with the following parameters:

(
 event: Event,
 ui:{
      node: Node
      position:
        {
        	// lastX + deltaX === clientX
          deltaX: number, deltaY: number,
          lastX: number, lastY: number,
          clientX: number, clientY: number
        }
    }
)

---

Contributing

• Fork the project
• Run the project in development mode: $ npm run dev
• Make changes.
• Add appropriate tests
• $ npm test
• If tests don't pass, make them pass.
• Update README with appropriate docs.
• Commit and PR

Release checklist

• Update CHANGELOG
• make release-patch, make release-minor, or make-release-major
• make publish

License

MIT

Changelog

1.1.2 (Nov 23, 2015)

• Bugfix: <Draggable> was calling back with clientX/Y, not offsetX/Y as it did pre-1.0. This unintended behavior has been fixed and a test has been added.