react-infinite-tree

react-infinite-tree

The infinite-tree library for React.

Demo: http://cheton.github.io/react-infinite-tree

Features

• High performance infinite scroll with large data set
• Customizable renderer to render the tree in any form
• Load nodes on demand
• Native HTML5 drag and drop API
• A rich set of APIs

Browser Support

Chrome	Edge	Firefox	IE	Opera	Safari
Yes	Yes	Yes	9+	Yes	Yes

Installation

npm install --save react-infinite-tree

Usage

Tree Structure

A tree structure can either be a node object or an array of node objects, and each node should have a unique id. Note that id, state, children, and parent are reserved keys for defining a node. See below for a basic tree structure:

{
    id: 'fruit',
    name: 'Fruit',
    children: [{
        id: 'apple',
        name: 'Apple'
    }, {
        id: 'banana',
        name: 'Banana',
        children: [{
            id: 'cherry',
            name: 'Cherry',
            loadOnDemand: true
        }]
    }]
}

Rendering Tree Nodes

You can use rowRenderer or pass a child function for rendering tree nodes. The child function will be supplied with the following properties:

• tree - https://github.com/cheton/infinite-tree/wiki/Functions:-Tree
• node - https://github.com/cheton/infinite-tree/wiki/Functions:-Node

import React from 'react';
import InfiniteTree from 'react-infinite-tree';

export default (props) => (
    <InfiniteTree
        width="100%"
        height={400}
        rowHeight={30}
        data={props.data}
    >
    {({ node, tree }) => {
        // Determine the toggle state
        let toggleState = '';
        const hasChildren = node.hasChildren();
        if ((!hasChildren && node.loadOnDemand) || (hasChildren && !node.state.open)) {
            toggleState = 'closed';
        }
        if (hasChildren && node.state.open) {
            toggleState = 'opened';
        }
        
        return (
            <TreeNode
                selected={node.state.selected}
                depth={node.state.depth}
                onClick={event => {
                    tree.selectNode(node);
                }}
            >
                <Toggler
                    state={toggleState}
                    onClick={() => {
                        if (toggleState === 'closed') {
                            tree.openNode(node);
                        } else if (toggleState === 'opened') {
                            tree.closeNode(node);
                        }
                    }}
                />
                <span>{node.name}</span>
            </TreeNode>
        );
    }}
    </InfiniteTree>
);

Components

TreeNode Component

import React from 'react';
import styled from 'styled-components';

const defaultRowHeight = 30;

const TreeNode = styled.div`
    cursor: default;
    position: relative;
    line-height: ${({ rowHeight = defaultRowHeight }) => rowHeight - 2}px;
    background: ${props => props.selected ? '#deecfd' : 'transparent'};
    border: ${props => props.selected ? '1px solid #06c' : '1px solid transparent'};
    padding-left: ${props => props.depth * 18}px;
    .dropdown {
        visibility: hidden;
    }
    &:hover {
        background: #f2fdff;
        .dropdown {
            visibility: inherit;
        }
    }
`;

export default TreeNode;

Toggler Component

import React from 'react';
import styled from 'styled-components';

const Toggler = styled(({ state, ...props }) => (
    <a {...props}>
        {(state === 'closed') &&
        <i className="fa fa-fw fa-chevron-right" />
        }
        {(state === 'opened') &&
        <i className="fa fa-fw fa-chevron-down" />
        }
    </a>
))`
    color: #333;
    display: inline-block;
    text-align: center;
    margin-right: 2px;
`;

export default Toggler;

Example

https://github.com/cheton/react-infinite-tree/blob/master/examples/Tree.jsx

TreeNode

https://github.com/cheton/react-infinite-tree/blob/master/examples/components/TreeNode.jsx

Toggler

https://github.com/cheton/react-infinite-tree/blob/master/examples/components/Toggler.jsx

API

Properties

Name	Type	Default	Description
autoOpen	Boolean	false	Whether to open all nodes when tree is loaded.
selectable	Boolean	true	Whether or not a node is selectable in the tree.
tabIndex	Number	0	Specifies the tab order to make tree focusable.
data	Array or Object	[]	Tree data structure, or a collection of tree data structures.
width	Number or String	'100%'	The tree width. It can be a number or string like "auto" or "100%".
height	Number		The tree height. Setting 100% height is currently not supported. See https://github.com/cheton/react-infinite-tree/issues/8.
rowHeight *	Number, Array, or Function({ node: Node, tree: Tree, index: Number }): Number		Either a fixed height, an array containing the heights of all the rows, or a function that returns the height of the given node.
rowRenderer	Function({ node: Node, tree: Tree, index: Number }): React Node		A row renderer for rendering a tree node.
loadNodes	Function(parentNode: Node, done: Function)		Loads nodes on demand.
shouldSelectNode	Function(node: Node): Boolean		Provides a function to determine if a node can be selected or deselected. The function must return true or false. This function will not take effect if selectable is not true.
scrollOffset	Number		Controls the scroll offset.
scrollToIndex	Number		Node index to scroll to.
onScroll	Function(scrollTop: Number, event: React.UIEvent)		Callback invoked whenever the scroll offset changes.
onContentWillUpdate	Function()		Callback invoked before updating the tree.
onContentDidUpdate	Function()		Callback invoked when the tree is updated.
onOpenNode	Function(node: Node)		Callback invoked when a node is opened.
onCloseNode	Function(node: Node)		Callback invoked when a node is closed.
onSelectNode	Function(node: Node)		Callback invoked when a node is selected or deselected.
onWillOpenNode	Function(node: Node)		Callback invoked before opening a node.
onWillCloseNode	Function(node: Node)		Callback invoked before closing a node.
onWillSelectNode	Function(node: Node)		Callback invoked before selecting or deselecting a node.

Tree Methods

https://github.com/cheton/infinite-tree/wiki/Functions:-Tree

Node Methods

https://github.com/cheton/infinite-tree/wiki/Functions:-Node

Node State

Name	Type	Description
depth	Number	The depth of a node.
open	Boolean	Whether the node is expanded.
path	String	A unique path string representing a node.
prefixMask	String	The prefix mask.
total	Number	The total number of child nodes.

Flat Tree Structure

https://github.com/cheton/flattree/blob/master/examples/tree1.js

<root>: path=".0", parent="", children=2, total=11, depth=0, prefix="0", open=1, lastChild=1
Alpha: path=".0.0", parent=".0", children=0, total=0, depth=1, prefix="00", open=0, lastChild=0
Bravo: path=".0.1", parent=".0", children=3, total=9, depth=1, prefix="00", open=1, lastChild=1
Charlie: path=".0.1.0", parent=".0.1", children=2, total=4, depth=2, prefix="000", open=1, lastChild=0
Delta: path=".0.1.0.0", parent=".0.1.0", children=2, total=2, depth=3, prefix="0001", open=1, lastChild=0
Echo: path=".0.1.0.0.0", parent=".0.1.0.0", children=0, total=0, depth=4, prefix="00011", open=0, lastChild=0
Foxtrot: path=".0.1.0.0.1", parent=".0.1.0.0", children=0, total=0, depth=4, prefix="00011", open=0, lastChild=1
Golf: path=".0.1.0.1", parent=".0.1.0", children=0, total=0, depth=3, prefix="0001", open=0, lastChild=1
Hotel: path=".0.1.1", parent=".0.1", children=1, total=2, depth=2, prefix="000", open=1, lastChild=0
India: path=".0.1.1.0", parent=".0.1.1", children=1, total=1, depth=3, prefix="0001", open=1, lastChild=1
Juliet: path=".0.1.1.0.0", parent=".0.1.1.0", children=0, total=0, depth=4, prefix="00010", open=0, lastChild=1
Kilo: path=".0.1.2", parent=".0.1", children=0, total=0, depth=2, prefix="000", open=0, lastChild=1

License

MIT