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Description

React draggable component

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React-Draggable

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A simple component for making elements draggable.

  
I can now be moved around!

|Version | Compatibility| |------------|--------------| |4.x | React 16.3+ | |3.x | React 15-16 | |2.x | React 0.14 - 15 | |1.x | React 0.13 - 0.14 | |0.x | React 0.10 - 0.13 |


Technical Documentation

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.

Exports

The default export is

. At the 
.DraggableCore
property is
. Here's how to use it:
// ES6
import Draggable from 'react-draggable'; // The default
import {DraggableCore} from 'react-draggable'; // 
import Draggable, {DraggableCore} from 'react-draggable'; // Both at the same time

// CommonJS let Draggable = require('react-draggable'); let DraggableCore = Draggable.DraggableCore;

A

 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

. Use
an intermediate wrapper (
...
) in this case.

Draggable Usage

View the Demo and its source for more.

import React from 'react';
import ReactDOM from 'react-dom';
import Draggable from 'react-draggable';

class App extends React.Component {

eventLogger = (e: MouseEvent, data: Object) => { console.log('Event: ', e); console.log('Data: ', data); };

render() { return (

Drag from here
This readme is really dragging on...
); } }

ReactDOM.render(, document.body);

Draggable API

The

 component transparently adds draggability to its children.

Note: Only a single child is allowed or an Error will be thrown.

For the

 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
,
onMouseUp
,
onTouchStart
, and
onTouchEnd
are used to keep track of dragging state.

React.DOM elements support the above 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'll need to be sure to transfer prop.

 Props:

//
// Types:
//
type DraggableEventHandler = (e: Event, data: DraggableData) => void | false;
type DraggableData = {
  node: HTMLElement,
  // lastX + deltaX === x
  x: number, y: number,
  deltaX: number, deltaY: number,
  lastX: number, lastY: number
};

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

// Determines which axis the draggable can move. This only affects // flushing to the DOM. Callbacks will still include all values. // Accepted values: // - both allows movement horizontally and vertically (default). // - x limits movement to horizontal axis. // - y limits movement to vertical axis. // - 'none' stops all movement. axis: string,

// Specifies movement boundaries. Accepted values: // - parent restricts movement within the node's offsetParent // (nearest node with position relative or absolute), or // - a selector, restricts movement within the targeted node // - 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 a selector to be used to prevent drag initialization. The string is passed to // Element.matches, so it's possible to use multiple selectors like .first, .second. // Example: '.body' cancel: string,

// Class names for draggable UI. // Default to 'react-draggable', 'react-draggable-dragging', and 'react-draggable-dragged' defaultClassName: string, defaultClassNameDragging: string, defaultClassNameDragged: string,

// 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. defaultPosition: {x: number, y: number},

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

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

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

// If desired, you can provide your own offsetParent for drag calculations. // By default, we use the Draggable's offsetParent. This can be useful for elements // with odd display types or floats. offsetParent: HTMLElement,

// Called whenever the user mouses down. Called regardless of handle or // disabled status. onMouseDown: (e: MouseEvent) => void,

// Called when dragging starts. If false is returned any handler, // the action will cancel. onStart: DraggableEventHandler,

// Called while dragging. onDrag: DraggableEventHandler,

// Called when dragging stops. onStop: DraggableEventHandler,

// If running in React Strict mode, ReactDOM.findDOMNode() is deprecated. // Unfortunately, in order for to work properly, we need raw access // to the underlying DOM node. If you want to avoid the warning, pass a nodeRef // as in this example: // // function MyComponent() { // const nodeRef = React.useRef(null); // return ( // //

Example Target
// // ); // } // // This can be used for arbitrarily nested components, so long as the ref ends up // pointing to the actual child DOM node and not a custom component. // // Thanks to react-transition-group for the inspiration. // // nodeRef is also available on . nodeRef: React.Ref,

// Much like React form elements, if this property is present, the item // becomes 'controlled' and is not responsive to user input. Use position // if you need to have direct control of the element. position: {x: number, y: number}

// A position offset to start with. Useful for giving an initial position // to the element. Differs from defaultPosition in that it does not // affect the position returned in draggable callbacks, and in that it // accepts strings, like {x: '10%', y: '10%'}. positionOffset: {x: number | string, y: number | string},

// Specifies the scale of the canvas your are dragging this element on. This allows // you to, for example, get the correct drag deltas while you are zoomed in or out via // a transform or matrix in the parent of this element. scale: number }

Note that sending

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

Controlled vs. Uncontrolled

 is a 'batteries-included' component that manages its own state. If you want to completely
control the lifecycle of the component, use 
.

For some users, they may want the nice state management that

 provides, but occasionally want
to programmatically reposition their components. 
 allows this customization via a system that
is similar to how React handles form components.

If the prop

position: {x: number, y: number}
is defined, the
 will ignore its internal state and use
the provided position instead. Alternatively, you can seed the position using 
defaultPosition
. Technically, since
 works only on position deltas, you could also seed the initial position using CSS 
top/left
.

We make one modification to the React philosophy here - we still allow dragging while a component is controlled. We then expect you to use at least an

onDrag
or
onStop
handler to synchronize state.

To disable dragging while controlled, send the prop

disabled={true}
- at this point the
 will operate
like a completely static component.

For users that require absolute control, a

 element is available. This is useful as an abstraction
over touch and mouse events, but with full control. 
 has no internal state.

See React-Resizable and React-Grid-Layout for some usage examples.

 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 and thus must have callbacks attached to be useful.

DraggableCore API

 takes a limited subset of options:
{
  allowAnyClick: boolean,
  cancel: string,
  disabled: boolean,
  enableUserSelectHack: boolean,
  offsetParent: HTMLElement,
  grid: [number, number],
  handle: string,
  onStart: DraggableEventHandler,
  onDrag: DraggableEventHandler,
  onStop: DraggableEventHandler,
  onMouseDown: (e: MouseEvent) => void,
  scale: number
}

Note that there is no start position.

 simply calls 
drag
handlers with the below parameters, indicating its position (as inferred from the underlying MouseEvent) and deltas. It is up to the parent to set actual positions on
.

Drag callbacks (

onStart
,
onDrag
,
onStop
) are called with the same arguments as
.

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

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