react-hierarchy-tree

React Hierarchy Tree Graph

React Hierarchy Tree Graph is a React component that lets you represent hierarchical data (e.g. ancestor trees, organisational structure, package dependencies) as an animated & interactive tree graph by leveraging D3's tree layout.

Contents

• Demo
• Installation
• Usage
• Props
• Node shapes
  • Overridable shapeProps
  • Individual shapeProps
• Styling
• Pre-defining a node's _collapsed state
• Keeping large trees responsive
• External data sources
  • Example
• Using foreignObjects
  • nodeLabelComponent
    • Example
• Recipes
  • Auto-centering inside treeContainer
  • Adding & removing nodes dynamically

Demo

• Current release: https://bkrem.github.io/react-d3-tree-demo/

Installation

npm i react-hierarchy-tree-graph

Usage

import React from 'react';
import Tree from 'react-hierarchy-tree-graph';
 
const myTreeData = [
  {
    name: 'Top Level',
    attributes: {
      keyA: 'val A',
      keyB: 'val B',
      keyC: 'val C',
    },
    children: [
      {
        name: 'Level 2: A',
        attributes: {
          keyA: 'val A',
          keyB: 'val B',
          keyC: 'val C',
        },
      },
      {
        name: 'Level 2: B',
      },
    ],
  },
];
 
class MyComponent extends React.Component {
  render() {
    return (
      {/* <Tree /> will fill width/height of its container; in this case `#treeWrapper` */}
      <div id="treeWrapper" style={{width: '50em', height: '20em'}}>
 
        <Tree data={myTreeData} />
 
      </div>
    );
  }
}

Props

Property	Type	Options	Required?	Default	Description
data	array object		required	undefined	Single-element array containing the root node object (see myTreeData above). Contains (at least) a name property. Passing the root node object without an array wrapping it is also possible.
nodeSvgShape	object	see Node shapes		{shape: 'circle', shapeProps: {r: 10}}	Sets a specific SVG shape element + shapeProps to be used for each node.
nodeLabelComponent	object	see Using foreignObjects		null	Allows using a React component as a node label; requires allowForeignObjects to be set.
onClick	func			undefined	Callback function to be called when a node is clicked. Has the function signature (nodeData, evt). The clicked node's data object is passed as first parameter, event object as second.
onMouseOver	func			undefined	Callback function to be called when mouse enters the space belonging to a node. Has the function signature (nodeData, evt). The clicked node's data object is passed as first parameter, event object as second.
onMouseOut	func			undefined	Callback function to be called when mouse leaves the space belonging to a node. Has the function signature (nodeData, evt). The clicked node's data object is passed as first parameter, event object as second.
onUpdate	func			undefined	Callback function to be called when the inner D3 component updates. That is - on every zoom or translate event, or when tree branches are toggled. The node's data object, as well as zoom level and coordinates are passed to the callback.
orientation	string (enum)	horizontal vertical		horizontal	horizontal - Tree expands left-to-right. vertical - Tree expands top-to-bottom.
translate	object			{x: 0, y: 0}	Translates the graph along the x/y axis by the specified amount of pixels (avoids the graph being stuck in the top left canvas corner).
pathFunc	string (enum)/func	diagonal elbow straight customFunc(linkData, orientation)		diagonal	diagonal - Smooth, curved edges between parent-child nodes. elbow - Sharp edges at right angles between parent-child nodes. straight - Straight lines between parent-child nodes. customFunc - Custom draw function that accepts linkData as its first param and orientation as its second.
collapsible	bool			true	Toggles ability to collapse/expand the tree's nodes by clicking them.
useCollapseData	bool	see Pre-defining a node's _collapsed state		false	Toggles whether the tree should automatically use any _collapsed: bool properties it finds on nodes in the passed data set to configure its initial layout.
shouldCollapseNeighborNodes	bool			false	If a node is currently being expanded, all other nodes at the same depth will be collapsed.
initialDepth	number	0..n		undefined	Sets the maximum node depth to which the tree is expanded on its initial render. Tree renders to full depth if prop is omitted.
depthFactor	number	-n..0..n		undefined	Ensures the tree takes up a fixed amount of space (node.y = node.depth * depthFactor), regardless of tree depth. TIP: Negative values invert the tree's direction.
zoomable	bool			true	Toggles ability to zoom in/out on the Tree by scaling it according to props.scaleExtent.
zoom	number	0..n		1	A floating point number to set the initial zoom level. It is constrained by props.scaleExtent. 1 is the default "non-zoomed" level.
scaleExtent	object	{min: 0..n, max: 0..n}		{min: 0.1, max: 1}	Sets the minimum/maximum extent to which the tree can be scaled if props.zoomable is true.
nodeSize	object	{x: 0..n, y: 0..n}		{x: 140, y: 140}	Sets a fixed size for each node. This does not affect node circle sizes, circle sizes are handled by the circleRadius prop.
separation	object	{siblings: 0..n, nonSiblings: 0..n}		{siblings: 1, nonSiblings: 2}	Sets separation between neighbouring nodes, differentiating between siblings (same parent) and non-siblings.
transitionDuration	number	0..n		500	Sets the animation duration (in ms) of each expansion/collapse of a tree node. Set this to 0 to deactivate animations completely.
textLayout	object	{textAnchor: enum, x: -n..0..n, y: -n..0..n, transform: string}		{textAnchor: "start", x: 10, y: -10, transform: undefined }	Configures the positioning of each node's text (name & attributes) relative to the node itself. textAnchor enums mirror the text-anchor spec. x & y accept integers denoting px values. transform mirrors the svg transform spec.
styles	object	see Styling		Node/Link CSS files	Overrides and/or enhances the tree's default styling.
allowForeignObjects	bool	see Using foreignObjects		false	Allows use of partially supported <foreignObject /> elements.
circleRadius (legacy)	number	0..n		undefined	Sets the radius of each node's <circle> element. Will be deprecated in v2, please use nodeSvgShape instead.
id	number	0..n		undefined	Sets unique id for each tree node

Node shapes

The nodeSvgShape prop allows specifying any SVG shape primitive to describe how the tree's nodes should be shaped.

Note: nodeSvgShape and circleRadius are mutually exclusive props. nodeSvgShape will be used unless the legacy circleRadius is specified.

For example, assuming we want to use squares instead of the default circles, we can do:

const svgSquare = {
  shape: 'rect',
  shapeProps: {
    width: 20,
    height: 20,
    x: -10,
    y: -10,
  }
}
 
// ...
 
<Tree data={myTreeData} nodeSvgShape={svgSquare}>

To avoid rendering any node element, simply set nodeSvgShape to { shape: 'none' }.

Overridable shapeProps

shapeProps is currently merged with node.circle/leafNode.circle (see Styling).

This means any properties passed in shapeProps will be overridden by properties with the same key in the node.circle/leafNode.circle style props.
This is to prevent breaking the legacy usage of circleRadius + styling via node/leafNode properties until it is deprecated fully in v2.

From v1.5.x onwards, it is therefore recommended to pass all node styling properties through shapeProps.

Individual shapeProps

shapeProps can be passed to a node individually by adding the nodeSvgShape property to the relevant node's data set. This allows setting each node's style, shape and size independently of the tree's overall shapeProps configuration (see Styling).

The usage example above can be extended to include individual shapeProps:

import React from 'react';
import Tree from 'react-hierarchy-tree-graph';
 
const myTreeData = [
  {
    name: 'Parent Node',
    attributes: {
      keyA: 'val A',
      keyB: 'val B',
      keyC: 'val C',
    },
    nodeSvgShape: {
      shapeProps: {
        fill: 'blue',
      },
    },
    children: [
      {
        name: 'Inner Node',
        attributes: {
          keyA: 'val A',
          keyB: 'val B',
          keyC: 'val C',
        },
        nodeSvgShape: {
          shape: 'rect',
          shapeProps: {
            width: 20,
            height: 20,
            x: -10,
            y: -10,
            fill: 'red',
          },
        },
      },
      {
        name: 'Level 2: B',
      },
    ],
  },
];
 
...
 

In the above, "Parent Node" will only be blue, but it will keep the default size and geometrical shape. "Inner Node", however, will completely change to a red rectangle with the given dimensions. Omitting shape, will keep node's default appearance.

Styling

The tree's styles prop may be used to override any of the tree's default styling. The following object shape is expected by styles:

{
  links: <svgStyleObject>,
  nodes: {
    node: {
      circle: <svgStyleObject>,
      name: <svgStyleObject>,
      attributes: <svgStyleObject>,
    },
    leafNode: {
      circle: <svgStyleObject>,
      name: <svgStyleObject>,
      attributes: <svgStyleObject>,
    },
  },
}

where <svgStyleObject> is any object containing CSS-like properties that are compatible with an <svg> element's style attribute, for example:

{
  stroke: 'blue',
  strokeWidth: 3,
}

For more information on the SVG style attribute, check this out.

Pre-defining a node's _collapsed state

The tree's initial layout can be specified node-for-node by enabling the useCollapseData prop. If activated, react-hierarchy-tree-graph will look for nodes specifying their own _collapsed property and structure the initial layout accordingly.

For example, given an input data set of the shape:

const dataWithCollapsedProperties = [
  {
    name: 'Top Level',
    children: [
      {
        name: '2: A',
        children: [
          {
            name: '3: Collapsed son of A',
            _collapsed: true,
            children: [
              {
                name: '4: Son of A',
              },
              {
                name: '4: Daughter of A',
              },
            ],
          },
          {
            name: '3: Daughter of A',
          },
        ],
      },
      {
        name: '2: B',
      },
    ],
  },
];

all nodes (with children) will be expanded except the Collapsed son of A node.

Clarifications:

• Why is a leading underscore required for _collapsed?
  • D3 binds its own internal collapsed property to each node, react-d3-tree simply adds a leading underscore to create a separate namespace.
• Should _collapsed: false be explicitly set?
  • No, there's no need to do this since react-hierarchy-tree-graph assumes a node to be expanded unless specified otherwise.

Note: props.useCollapseData and props.initialDepth are mutually exclusive. If useCollapseData is set, initialDepth values will be ignored.

Keeping large trees responsive

Attempting to render large trees with animated transitions may cause significant input lag. This is due to limitations related to the way D3's select().transition() enqueues calls to requestAnimationFrame, discussed here.

Until a custom debounce for expand/collapse has been implemented, it is therefore recommended to set props.transitionDuration to 0 for large tree graphs if you're experiencing responsiveness issues.

External data sources

Statically hosted JSON or CSV files can be used as data sources via the additional treeUtil module.

Example

import React from 'react';
import { Tree, treeUtil } from 'react-hierarchy-tree-graph';
 
const csvSource = 'https://raw.githubusercontent.com/bkrem/react-d3-tree/master/docs/examples/data/csv-example.csv';
 
constructor() {
  super();
 
  this.state = {
    data: undefined,
  };
}
 
componentWillMount() {
  treeUtil.parseCSV(csvSource)
  .then((data) => {
    this.setState({ data })
  })
  .catch((err) => console.error(err));
}
 
class MyComponent extends React.Component {
  render() {
    return (
      {/* <Tree /> will fill width/height of its container; in this case `#treeWrapper` */}
      <div id="treeWrapper" style={{width: '50em', height: '20em'}}>
 
        <Tree data={this.state.data} />
 
      </div>
    );
  }
}

For details regarding the treeUtil module, please check the module's API docs.
For examples of each data type that can be parsed with treeUtil, please check the data source examples.

Using foreignObjects

⚠️ Requires allowForeignObjects prop to be set due to limited browser support: IE does not currently support foreignObject elements.

The SVG spec's foreignObject element allows foreign XML content to be rendered into the SVG namespace, unlocking the ability to use regular React components for elements of the tree graph.

nodeLabelComponent

The nodeLabelComponent prop provides a way to use a React component for each node's label. It accepts an object with the following signature:

{
  render: ReactElement,
  foreignObjectWrapper?: object
}

• render is the XML React-D3-Tree will use to render each node's label.
• foreignObjectWrapper contains a set of attributes that should be passed to the <foreignObject /> that wraps nodeLabelComponent. For possible attributes please check the spec.

Note: By default, foreignObjectWrapper will set its width and height attributes to nodeSize.x - 24px and nodeSize.y - 24px respectively; where a base margin of 24px is subtracted to avoid the overlapping of elements. To override this behaviour for each attribute, specify width and/or height properties for your foreignObjectWrapper.

Note: The ReactElement passed to render is cloned with its existing props and receives an additional nodeData object prop, containing information about the current node.

Example

Assuming we have a React component NodeLabel and we want to avoid node's label overlapping with the node itself by moving its position along the Y-axis, we could implement nodeLabelComponent like so:

class NodeLabel extends React.PureComponent {
  render() {
    const {className, nodeData} = this.props
    return (
      <div className={className}>
        <h2>{nodeData.name}</h2>
        {nodeData._children && 
          <button>{nodeData._collapsed ? 'Expand' : 'Collapse'}</button>
        }
      </div>
    )
  }
}
 
/* ... */
 
render() {
  return (
    <Tree 
      data={myTreeData}
      allowForeignObjects
      nodeLabelComponent={{
        render: <NodeLabel className='myLabelComponentInSvg' />,
        foreignObjectWrapper: {
          y: 24
        }
      }}
    />
    )
}

Recipes

Auto-centering inside treeContainer

Adding & removing nodes dynamically