React Treeview with Material UI

A Treeview React Component that can use material-ui's styling.

• LIVE DEMO
• Example code

Installation

$ npm install --save react-treeview-mui

import import React, {Component, PropTypes} from 'react'
// With material-ui
// be sure to have <MuiTreeList /> inside <MuiThemeProvider />
import {MuiTreeList} from 'react-treeview-mui'
// Without material-ui styling
import {TreeList} from 'react-treeview-mui'

// UI state (e.g., expanded list items) is tracked locally
const listItems = [...,{title: 'List Item'},...]
class MyComponent extends Component {
	render() {
		<MuiTreeList
			listItems={listItems}
			contentKey={'title'} />
	}
}

// UI state is tracked outside of <MuiTreeList />
// Maybe through Redux
class MySecondComponent extends Component {
	render() {
		<MuiTreeList 
			listItems={listItems}
			contentKey={'title'}
			useFolderIcons={true}
			haveSearchbar={true}
			listItemIsEnabled={this.props.listItemIsEnabled}
			expandedListItems={this.props.expandedListItems}
			activeListItem={this.props.activeListItem}
			handleTouchTap={this.props.handleTouchTap}
			handleTouchTapInSearchMode={this.props.handleTouchTapInSearchMode}
			handleSearch={this.props.handleSearch}
			searchTerm={this.props.searchTerm} />
	}
}

Usage

Data for nodes

One of the required props for the Component is the data for the list items. Instead of an object data structure with child list items nested inside parent list items, the Component takes in an array of list item objects. To accomodate this structure, the objects have a few required keys as following:

const listItems = [
{
    // Each list item is tracked by its index in the master array
    depth: 0, // Used to style the list item. Items with 0 depth will not be rendered and act as the root parent
    children: [1, 3, 10] // Indexes for child list items. If undefined, list item will be treated as leaf
}   
...,
{
    depth: 1,
    children: [12,16],
    parentIndex: 0, // Index of parent list item
    disabled: false // false by default, disables click event listeners for disabled list items
},{
    depth: 2,
    children: [13,14,15],
    parentIndex: 11,
    disabled: false
},
...
]

Why use an Array?

First off, it's faster. But unless you're rendering hundreds and hundreds of list items, speed wouldn't be your concern.

Apart from that, it comes from personal preference. I found it to be easier to reason about how the Component should react to change in state. Specifically, I found that it aligned well with "the Redux-way" of thinking about state management with reducers.

Props

name	type	default	description
listItems	[Object]	required	An array of list item objects.
contentKey	String	required	The name of the key inside list item objects whose value should be used for the content in the rendered list items.
style	Object	undefined	JavaScript style object to overwrite preset styles.
expandedListItems	[Integer]	undefined	An array of the index values of list items that should be expanded. If no value is given, the expansion of tree nodes will be tracked by state internal to the Component.
activeListItem	Integer	undefined	Index value of the active list item. If no value is given, it will be tracked by state internal to the Component.
haveSearchbar	Boolean	false	If true, a searchbar component will be added.
searchTerm	String	undefined	String value for search term. If no value is given, it will be tracked by state internal to the Component.
handleSearch	Function	undefined	The default search function is very rudimentary. Insert a function to override the default behavior. Receives the search term (String) as first parameter.
handleTouchTap	Function	undefined	Function that gets called when a If expandedListItems and activeListItem is tracked outside of the Component, this function must deal with those states as well. Receives the list item (Object) and the index value of that list item (Int) as parameters.
handleTouchTapInSearchMode	Function	undefined	Receives the search term (String) as first parameter.
listHeight	Integer	undefined	Overwrites the height (in px) of list items
useFolderIcons	Boolean	undefined	Only for MuiTreeList. If true, will use folder and file icons for list items.

Animation

The Component uses ReactCSSTransitionGroup to animate the items inside the treeview. It exposes the classes tree-list-enter and tree-list-leave to style.

example

.tree-list-enter {
	animation-name: tree-list-enter;
	animation-duration: 0.3s;
	animation-fill-mode: forwards;
  transform: translateZ(0);
}
.tree-list-leave {
	animation-name: tree-list-leave;
	animation-duration: 0.2s;
	animation-fill-mode: forwards;
}
@keyframes tree-list-enter {
	0% {
		height: 0px;
		opacity: 0.01;
	}
	100% {
		height: 32px;
		opacity: 1;
	}
}
@keyframes tree-list-leave {
	0% {
		height: 32px;
		opacity: 1;
	}
	100% {
		height: 0px;
		opacity: 0.01;
	}
}