Grid-Layout-Component

It is fork of React-Grid-Layout and was reworked on web compoenent. Grid Layout Component is a grid layout system much like Packery or Gridster.

Unlike those systems, it is responsive and supports breakpoints. Breakpoint layouts can be provided by the user or autogenerated.

Firefox only need Constructible style sheets polyfill. No deps or any frameworks or libraries.

GIF from production usage on BitMEX.com

[Demo | Changelog | CodeSandbox Editable demo]

Table of Contents

• Demos
• Features
• Installation
• Usage
• Responsive Usage
• Providing Grid Width
• Grid Layout Props
• Responsive Grid Layout Props
• Grid Item Props
• User Recipes
• Performance
• Contribute
• TODO List

Demos

1. Showcase
2. Basic
3. No Dragging/Resizing (Layout Only)
4. Messy Layout Autocorrect
5. Layout Defined on Children
6. Static Elements
7. Adding/Removing Elements
8. Saving Layout to LocalStorage
9. Saving a Responsive Layout to LocalStorage
10. Minimum and Maximum Width/Height
11. Dynamic Minimum and Maximum Width/Height
12. No Vertical Compacting (Free Movement)
13. Prevent Collision
14. Error Case
15. Toolbox
16. Drag From Outside
17. Bounded Layout
18. Resizable Handles
19. Scaled Containers
20. Allow Overlap

Projects Using Grid-Layout-Component

Know of others? Create a PR to let me know!

Features

• 100% Pure JS - no jQuery or React
• Compatible with server-rendered apps
• Draggable widgets
• Resizable widgets
• Static widgets
• Configurable packing: horizontal, vertical, or off
• Bounds checking for dragging and resizing
• Widgets may be added or removed without rebuilding grid
• Layout can be serialized and restored
• Responsive breakpoints
• Separate layouts per responsive breakpoint
• Grid Items placed using CSS Transforms

Installation

Install the Grid Layout Component package package using npm:

npm install react-grid-layout

Usage

Use ReactGridLayout like any other component. The following example below will produce a grid with three items where:

• users will not be able to drag or resize item a
• item b will be restricted to a minimum width of 2 grid blocks and a maximum width of 4 grid blocks
• users will be able to freely drag and resize item c

import GridLayout from "react-grid-layout";

class MyFirstGrid extends React.Component {
  render() {
    // layout is an array of objects, see the demo for more complete usage
    const layout = [
      { i: "a", x: 0, y: 0, w: 1, h: 2, static: true },
      { i: "b", x: 1, y: 0, w: 3, h: 2, minW: 2, maxW: 4 },
      { i: "c", x: 4, y: 0, w: 1, h: 2 }
    ];
    return (
      <GridLayout
        className="layout"
        layout={layout}
        cols={12}
        rowHeight={30}
        width={1200}
      >
        <div key="a">a</div>
        <div key="b">b</div>
        <div key="c">c</div>
      </GridLayout>
    );
  }
}

You may also choose to set layout properties directly on the children:

import GridLayout from "react-grid-layout";

class MyFirstGrid extends React.Component {
  render() {
    return (
      <GridLayout className="layout" cols={12} rowHeight={30} width={1200}>
        <div key="a" data-grid={{ x: 0, y: 0, w: 1, h: 2, static: true }}>
          a
        </div>
        <div key="b" data-grid={{ x: 1, y: 0, w: 3, h: 2, minW: 2, maxW: 4 }}>
          b
        </div>
        <div key="c" data-grid={{ x: 4, y: 0, w: 1, h: 2 }}>
          c
        </div>
      </GridLayout>
    );
  }
}

Usage without Browserify/Webpack

A module usable in a <script> tag is included here. It uses a UMD shim and excludes React, so it must be otherwise available in your application, either via RequireJS or on window.React.

Responsive Usage

To make RGL responsive, use the <ResponsiveReactGridLayout> element:

import { Responsive as ResponsiveGridLayout } from "react-grid-layout";

class MyResponsiveGrid extends React.Component {
  render() {
    // {lg: layout1, md: layout2, ...}
    const layouts = getLayoutsFromSomewhere();
    return (
      <ResponsiveGridLayout
        className="layout"
        layouts={layouts}
        breakpoints={{ lg: 1200, md: 996, sm: 768, xs: 480, xxs: 0 }}
        cols={{ lg: 12, md: 10, sm: 6, xs: 4, xxs: 2 }}
      >
        <div key="1">1</div>
        <div key="2">2</div>
        <div key="3">3</div>
      </ResponsiveGridLayout>
    );
  }
}

When in responsive mode, you should supply at least one breakpoint via the layouts property.

When using layouts, it is best to supply as many breakpoints as possible, especially the largest one. If the largest is provided, RGL will attempt to interpolate the rest.

You will also need to provide a width, when using <ResponsiveReactGridLayout> it is suggested you use the HOC WidthProvider as per the instructions below.

It is possible to supply default mappings via the data-grid property on individual items, so that they would be taken into account within layout interpolation.

Providing Grid Width

Both <ResponsiveReactGridLayout> and <ReactGridLayout> take width to calculate positions on drag events. In simple cases a HOC WidthProvider can be used to automatically determine width upon initialization and window resize events.

import { Responsive, WidthProvider } from "react-grid-layout";

const ResponsiveGridLayout = WidthProvider(Responsive);

class MyResponsiveGrid extends React.Component {
  render() {
    // {lg: layout1, md: layout2, ...}
    var layouts = getLayoutsFromSomewhere();
    return (
      <ResponsiveGridLayout
        className="layout"
        layouts={layouts}
        breakpoints={{ lg: 1200, md: 996, sm: 768, xs: 480, xxs: 0 }}
        cols={{ lg: 12, md: 10, sm: 6, xs: 4, xxs: 2 }}
      >
        <div key="1">1</div>
        <div key="2">2</div>
        <div key="3">3</div>
      </ResponsiveGridLayout>
    );
  }
}

This allows you to easily replace WidthProvider with your own Provider HOC if you need more sophisticated logic.

WidthProvider accepts a single prop, measureBeforeMount. If true, WidthProvider will measure the container's width before mounting children. Use this if you'd like to completely eliminate any resizing animation on application/component mount.

Have a more complicated layout? WidthProvider is very simple and only listens to window 'resize' events. If you need more power and flexibility, try the SizeMe React HOC as an alternative to WidthProvider.

Grid Layout Props

RGL supports the following properties (see the source for the final word on this):

//
// Basic props
//

// If true, the container height swells and contracts to fit contents.
// It will be set automaticaly in false when height or overflow is set.
autoSize: ?boolean = true,

// Number of columns in this layout.
cols: ?number = 12,

// Compaction type.
compactType: ?('vertical' | 'horizontal') = 'vertical';

// Layout is an array of object with the format:
// {x: number, y: number, w: number, h: number}
// The index into the layout must match the key used on each item component.
// If you choose to use custom keys, you can specify that key in the layout
// array objects like so:
// {i: string, x: number, y: number, w: number, h: number}
layout: ?array = null, // If not provided, use data-grid props on children

// Margin between items [x, y] in px.
margin: ?[number, number] = [10, 10],

// Padding inside the container [x, y] in px
containerPadding: ?[number, number] = margin,

// Rows have a static height, but you can change this based on breakpoints
// if you like.
rowHeight: ?number = 150,

//
// Flags
//
drag: ?boolean = true,
resizable: ?boolean = true,
// If parent DOM node of ResponsiveReactGridLayout or ReactGridLayout has "transform: scale(n)" css property,
// we should set scale coefficient to avoid render artefacts while dragging.
transformScale: ?number = 1,

// If true, grid can be placed one over the other.
// If set, implies `preventCollision`.
allowOverlap: ?boolean = false,

// If true, grid items won't change position when being
// dragged over. If `allowOverlap` is still false,
// this simply won't allow one to drop on an existing object.
preventCollision: ?boolean = false,

//
// Callbacks
//

// Callback so you can save the layout.
// Calls back with (currentLayout) after every drag or resize stop.
onLayoutChange: (layout: Layout) => void,

//
// All callbacks below have signature (layout, oldItem, newItem, placeholder, e, element).
// 'start' and 'stop' callbacks pass `undefined` for 'placeholder'.
//
type ItemCallback = (layout: Layout, oldItem: LayoutItem, newItem: LayoutItem,
                     placeholder: LayoutItem, e: MouseEvent, element: HTMLElement) => void,

// Calls when drag starts.
onDragStart: ItemCallback,
// Calls on each drag movement.
onDrag: ItemCallback,
// Calls when drag is complete.
onDragStop: ItemCallback,
// Calls when resize starts.
onResizeStart: ItemCallback,
// Calls when resize movement happens.
onResize: ItemCallback,
// Calls when resize is complete.
onResizeStop: ItemCallback,

//
// Dropover functionality
//

// Calls when an element has been dropped into the grid from outside.
onDrop: (layout: Layout, item: ?LayoutItem, e: Event) => void,
// Calls when an element is being dragged over the grid from outside as above.
// This callback should return an object to dynamically change the droppingItem size
// Return false to short-circuit the dragover
onDropDragOver: (e: DragOverEvent) => ?({|w?: number, h?: number|} | false),

// Ref for getting a reference for the grid's wrapping div.
// You can use this instead of a regular ref and the deprecated `ReactDOM.findDOMNode()`` function.
innerRef: ?React.Ref<"div">,

Responsive Grid Layout Props

The responsive grid layout can be used instead. It supports all of the props above, excepting layout. The new properties and changes are:

// {name: pxVal}, e.g. {lg: 1200, md: 996, sm: 768, xs: 480}
// Breakpoint names are arbitrary but must match in the cols and layouts objects.
breakpoints: ?Object = {lg: 1200, md: 996, sm: 768, xs: 480, xxs: 0},

// # of cols. This is a breakpoint -> cols map, e.g. {lg: 12, md: 10, ...}
cols: ?Object = {lg: 12, md: 10, sm: 6, xs: 4, xxs: 2},


// margin (in pixels). Can be specified either as horizontal and vertical margin, e.g. `[10, 10]` or as a breakpoint -> margin map, e.g. `{lg: [10, 10], md: [10, 10], ...}.
margin: [number, number] | {[breakpoint: $Keys<breakpoints>]: [number, number]},


// containerPadding (in pixels). Can be specified either as horizontal and vertical padding, e.g. `[10, 10]` or as a breakpoint -> containerPadding map, e.g. `{lg: [10, 10], md: [10, 10], ...}.
containerPadding: [number, number] | {[breakpoint: $Keys<breakpoints>]: [number, number]},


// layouts is an object mapping breakpoints to layouts.
// e.g. {lg: Layout, md: Layout, ...}
layouts: {[key: $Keys<breakpoints>]: Layout},

//
// Callbacks
//

// Calls back with breakpoint and new # cols
onBreakpointChange: (newBreakpoint: string, newCols: number) => void,

// Callback so you can save the layout.
// AllLayouts are keyed by breakpoint.
onLayoutChange: (currentLayout: Layout, allLayouts: {[key: $Keys<breakpoints>]: Layout}) => void,

// Callback when the width changes, so you can modify the layout as needed.
onWidthChange: (containerWidth: number, margin: [number, number], cols: number, containerPadding: [number, number]) => void;

Grid Item Props

RGL supports the following properties on grid items or layout items. When initializing a grid, build a layout array (as in the first example above), or attach this object as the data-grid property to each of your child elements (as in the second example).

Note that if a grid item is provided but incomplete (missing one of x, y, w, or h), an error will be thrown so you can correct your layout.

If no properties are provided for a grid item, one will be generated with a width and height of 1.

You can set minimums and maximums for each dimension. This is for resizing; it of course has no effect if resizing is disabled. Errors will be thrown if your mins and maxes overlap incorrectly, or your initial dimensions are out of range.

Any <GridItem> properties defined directly will take precedence over globally-set options. For example, if the layout has the property drag: false, but the grid item has the prop drag: true, the item will be draggable, even if the item is marked static: true.

{

  // A string corresponding to the component key
  i: string,

  // These are all in grid units, not pixels
  x: number,
  y: number,
  w: number,
  h: number,
  minW: ?number = 0,
  maxW: ?number = Infinity,
  minH: ?number = 0,
  maxH: ?number = Infinity,

  // If true, equal to `drag: false, resizable: false`.
  static: ?boolean = false,
  // If false, will not be draggable. Overrides `static`.
  drag: ?boolean = true,
  // If false, will not be resizable. Overrides `static`.
  resizable: ?boolean = true,
  // By default, a handle is only shown on the bottom-right (southeast) corner.
  // Note that resizing from the top or left is generally not intuitive.
  resizeHandles?: ?Array<'s' | 'w' | 'e' | 'n' | 'sw' | 'nw' | 'se' | 'ne'> = ['se']
  // If true and draggable, item will be moved only within grid.
  bounded: ?boolean = false
}

Performance

<ReactGridLayout> has an optimized shouldComponentUpdate implementation, but it relies on the user memoizing the children array:

// lib/ReactGridLayout.jsx
// ...
shouldComponentUpdate(nextProps: Props, nextState: State) {
  return (
    // NOTE: this is almost always unequal. Therefore the only way to get better performance
    // from SCU is if the user intentionally memoizes children. If they do, and they can
    // handle changes properly, performance will increase.
    this.props.children !== nextProps.children ||
    !fastRGLPropsEqual(this.props, nextProps, isEqual) ||
    !isEqual(this.state.activeDrag, nextState.activeDrag)
  );
}
// ...

If you memoize your children, you can take advantage of this, and reap faster rerenders. For example:

function MyGrid(props) {
  const children = React.useMemo(() => {
    return new Array(props.count).fill(undefined).map((val, idx) => {
      return <div key={idx} data-grid={{ x: idx, y: 1, w: 1, h: 1 }} />;
    });
  }, [props.count]);
  return <ReactGridLayout cols={12}>{children}</ReactGridLayout>;
}

Because the children prop doesn't change between rerenders, updates to <MyGrid> won't result in new renders, improving performance.

Custom Child Components and Draggable Handles

If you use React Components as grid children, they need to do a few things:

1. Forward refs to an underlying DOM node, and
2. Forward style and className to that same DOM node.

For example:

const CustomGridItemComponent = React.forwardRef(({style, className, ...props}, ref) => {
  return (
    <div style={{ /* styles */, ...style}} className={className} ref={ref}>
      {/* Some other content */}
    </div>
  );
}

The same is true of custom elements as draggable handles using the draggableHandle prop. This is so that the underlying react-draggable library can get a reference to the DOM node underneath, manipulate positioning via style, and set classes.

Contribute

If you have a feature request, please add it as an issue or make a pull request.

If you have a bug to report, please reproduce the bug in CodeSandbox to help us easily isolate it.

TODO List

• Basic grid layout
• Fluid grid layout
• Grid packing
• Draggable grid items
• Live grid packing while dragging
• Resizable grid items
• Layouts per responsive breakpoint
• Define grid attributes on children themselves (data-grid key)
• Static elements
• Persistent id per item for predictable localstorage restores, even when # items changes
• Min/max w/h per item
• Resizable handles on other corners
• Configurable w/h per breakpoint