README.md

react-checkbox-tree

A simple and elegant checkbox tree for React.

Usage

Installation

Install the library using your favorite dependency manager:

yarn add react-checkbox-tree

Using npm:

npm install react-checkbox-tree --save

Note – By default, this library makes use of Font Awesome styles and expects them to be loaded in the browser.

Include CSS

For your convenience, the library's styles can be consumed utilizing one of the following files:

• node_modules/react-checkbox-tree/lib/react-checkbox-tree.css
• node_modules/react-checkbox-tree/src/less/react-checkbox-tree.less
• node_modules/react-checkbox-tree/src/scss/react-checkbox-tree.scss

Either include one of these files in your stylesheets or utilize a CSS loader:

import 'react-checkbox-tree/lib/react-checkbox-tree.css';

Render Component

Below is a minimal example using state hooks. Note that CheckboxTree is a controlled component, so you must update its checked and expanded properties whenever a change occurs.

import React, { useState } from 'react';
import CheckboxTree from 'react-checkbox-tree';

const nodes = [{
  value: 'mars',
  label: 'Mars',
  children: [
    { value: 'phobos', label: 'Phobos' },
    { value: 'deimos', label: 'Deimos' },
  ],
}];

function Widget() {
  const [checked, setChecked] = useState([]);
  const [expanded, setExpanded] = useState([]);

  return (
    <CheckboxTree
      nodes={nodes}
      checked={checked}
      expanded={expanded}
      onCheck={(checked) => setChecked(checked)}
      onExpand={(expanded) => setExpanded(expanded)}
    />
  );
}

Note – All node objects must have a unique value. This component serializes the values into the checked and expanded array for performance optimizations.

Changing the Default Icons

By default, react-checkbox-tree uses Font Awesome 5/6 for the various icons that appear in the tree. To utilize Font Awesome 4 icons, simply pass in iconsClass="fa4":

<CheckboxTree
    ...
    iconsClass="fa4"
/>

To change the rendered icons entirely, simply pass in the icons property and override the defaults. Note that you can override as many or as little icons as you like:

<CheckboxTree
    ...
    icons={{
        check: <span className="rct-icon rct-icon-check" />,
        uncheck: <span className="rct-icon rct-icon-uncheck" />,
        halfCheck: <span className="rct-icon rct-icon-half-check" />,
        expandClose: <span className="rct-icon rct-icon-expand-close" />,
        expandOpen: <span className="rct-icon rct-icon-expand-open" />,
        expandAll: <span className="rct-icon rct-icon-expand-all" />,
        collapseAll: <span className="rct-icon rct-icon-collapse-all" />,
        parentClose: <span className="rct-icon rct-icon-parent-close" />,
        parentOpen: <span className="rct-icon rct-icon-parent-open" />,
        leaf: <span className="rct-icon rct-icon-leaf" />,
    }}
/>

If you are using the react-fontawesome library, you can also directly substitute those icons:

import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'

...

<CheckboxTree
    ...
    icons={{
        check: <FontAwesomeIcon className="rct-icon rct-icon-check" icon="check-square" />,
        uncheck: <FontAwesomeIcon className="rct-icon rct-icon-uncheck" icon={['fas', 'square']} />,
        halfCheck: <FontAwesomeIcon className="rct-icon rct-icon-half-check" icon="check-square" />,
        expandClose: <FontAwesomeIcon className="rct-icon rct-icon-expand-close" icon="chevron-right" />,
        expandOpen: <FontAwesomeIcon className="rct-icon rct-icon-expand-open" icon="chevron-down" />,
        expandAll: <FontAwesomeIcon className="rct-icon rct-icon-expand-all" icon="plus-square" />,
        collapseAll: <FontAwesomeIcon className="rct-icon rct-icon-collapse-all" icon="minus-square" />,
        parentClose: <FontAwesomeIcon className="rct-icon rct-icon-parent-close" icon="folder" />,
        parentOpen: <FontAwesomeIcon className="rct-icon rct-icon-parent-open" icon="folder-open" />,
        leaf: <FontAwesomeIcon className="rct-icon rct-icon-leaf-close" icon="file" />
    }}
/>

Utility Functions

In addition to the CheckboxTree component, additional utility functions are available to set the initial state of the tree.

expandNodesToLevel(nodes, targetLevel)

Creates a list of all parent node keys until targetLevel.

Arguments:

• nodes (Array): The same array of nodes passed into the main CheckboxTree component
• targetLevel (number): The maximum expansion depth. Use Infinity for maximum depth.

Returns:

• Array: A list of node keys.

Properties

Property	Type	Description	Default
nodes	array	Required. Specifies the tree nodes and their children.
checkModel	string	Specifies which checked nodes should be stored in the checked array. Accepts 'leaf' or 'all'.	'leaf'
checked	array	An array of checked node values.	[]
direction	string	A string that specify whether the direction of the component is left-to-right ('ltr') or right-to-left ('rtl').	'ltr'
disabled	bool	If true, the component will be disabled and nodes cannot be checked.	false
expandDisabled	bool	If true, the ability to expand nodes will be disabled.	false
expandOnClick	bool	If true, nodes will be expanded by clicking on labels. Requires a non-empty onClick function.	false
expanded	array	An array of expanded node values.	[]
icons	object	An object containing the mappings for the various icons and their components. See Changing the Default Icons.	{ ... }
iconsClass	string	A string that specifies which icons class to utilize. Currently, 'fa4' and 'fa5' are supported.	'fa5'
id	string	A string to be used for the HTML ID of the rendered tree and its nodes.	null
lang	object	An object containing the language mappings for the various text elements.	{ ... }
name	string	Optional name for the hidden <input> element.	undefined
nameAsArray	bool	If true, the hidden <input> will encode its values as an array rather than a joined string.	false
nativeCheckboxes	bool	If true, native browser checkboxes will be used instead of pseudo-checkbox icons.	false
noCascade	bool	If true, toggling a parent node will not cascade its check state to its children.	false
onlyLeafCheckboxes	bool	If true, checkboxes will only be shown for leaf nodes.	false
optimisticToggle	bool	If true, toggling a partially-checked node will select all children. If false, it will deselect.	true
showExpandAll	bool	If true, buttons for expanding and collapsing all parent nodes will appear in the tree.	false
showNodeIcon	bool	If true, each node will show a parent or leaf icon.	true
showNodeTitle	bool	If true, the label of each node will become the title of the resulting DOM node. Overridden by node.title.	false
onCheck	function	onCheck handler: function(checked, targetNode) {}	() => {}
onClick	function	onClick handler: function(targetNode) {}. If set, onClick will be called when a node's label has been clicked.	() => {}
onExpand	function	onExpand handler: function(expanded, targetNode) {}	() => {}

onCheck and onExpand

Node Properties

Individual nodes within the nodes property can have the following structure:

Property	Type	Description	Default
label	mixed	Required. The node's label.
value	mixed	Required. The node's value.
children	array	An array of child nodes.	null
className	string	A className to add to the node.	null
disabled	bool	Whether the node should be disabled.	false
icon	mixed	A custom icon for the node.	null
showCheckbox	bool	Whether the node should show a checkbox.	true
title	string	A custom title attribute for the node.	null