Treeviz

This javascript module aims at providing an easy interface in order to represent tree diagrams on screen with the ability to handle dynamic data flows. The data format must be JSON.

Treeviz Playground

Installation

With npm : npm install treeviz

and then you can use it with : import * as Treeviz from 'treeviz';

Or download this repository and link the dist/index.js file in your page directly : <script src="./dist/index.js><script> Also, but not recommended, you can use : <script src="https://rawgit.com/PierreCapo/treeviz/master/dist/index.js"></script>

Usage

Basic example

// Define a tree element where dimensions are mandatory
<div id="tree" style="height:700px; width:900px"></div>

<script>
// Define a dataset
var data = [
  { id: 1, text_1: "Father", father: null },
  { id: 2, text_1: "Child A", father: 1 },
  { id: 3, text_1: "Child B", , father: 1 },
  { id: 4, text_1: "Subchild C", father: 2 }
];

// Define and configure a tree object
var myTree = Treeviz.create({
  htmlID: "tree",
  nodeField: "id",
  flatData: true,
  nodeColor: (nodeData) => "grey",
  relationnalField: "father",
});

// Display the tree based on the data
myTree.refresh(data);
</script>

To update the tree visually you will just have to pass new data to the refresh method like this :

myTree.refresh(data);
myTree.refresh(data_update1);
myTree.refresh(data_update2);

The tree will be clever enough to updates only the part of the trees that have been added or removed in the dataset, and so it won't redraw the entire tree.

API

The big part of the API is configuring the tree before passing data to it :

Treeviz.create(config);

The table below lists all the avalaible key that the config object can have

Key	Type	Default	Definition
htmlID	string (Required)		The HTML id tag on the page where the tree should be drawn. It must have a width and an height specified
nodeField	string	"id"	The unique identifier field in the dataset representing the node
relationnalField	string	"father"	In case of flat dataset, usually the relationnal field between each node is the field representing the father of the node, linking it to the id of the field. (See example below).
flatData	boolean	true	Specify whether the data passed to the tree is flat or already hierarchical
zoomBehavior	boolean	true	Toggle the ability to pan and zoom the tree
nodeWidth	number	160	Width of a node in px
nodeHeight	number	100	Height of a node in px
nodeColor	function	(nodeData) => "#2196f3"	Color of the node
linkColor	function	(nodeData) => "#ffcc80"	Color of the link
linkWidth	function	(nodeData) => 10	Width of the link
linkShape	"quadraticBeziers" | "orthogonal"	"quadraticBeziers"	Shape of the link
nodeTemplate	function	(nodeData) => null	HTML template for every node
horizontalLayout	boolean	true	Direction of the tree. If true, the tree expands from left to right. If false, it goes from top to bottom
onNodeClick	function	(nodeData) => null	Function handling the event when someone click on it
onNodeMouseEnter	function	(nodeData) => null	Function handling the event when someone hover a node
onNodeMouseLeave	function	(nodeData) => null	Function handling the event when the mouse pointer leaves a node
nodeDepthDistance	number or "auto"	300	Set the distance in pixels between two depths in the tree. If the value is auto it will automatically display the tree to fit the size of the container.
nodeSpacerPercentage	number	1.25	Set the distance between nodes in the same level as a coefficient of node dimensions. Recommended to have the value superior to 1
marginTop	number	1.25	Set the margin between the SVG element and the tree
marginBottom	number	1.25	Set the margin between the SVG element and the tree
marginLeft	number	1.25	Set the margin between the SVG element and the tree
marginRight	number	1.25	Set the margin between the SVG element and the tree

Example

Assuming that you already have an HTML element on the pagh with the tag id="a_tree"

Flat data case :

var flat_data_example = [
  { id: 0, node_name: "Root node", father: null, number: 10 },
  { id: 1, node_name: "Child A", father: 0, number: 5 },
  { id: 2, node_name: "Child B", father: 0, number: 3 },
  { id: 3, node_name: "Child C", father: 0, number: 2 },
];

var myTree = Treeviz.create({
  htmlID: "tree",
  nodeField: "id",
  flatData: true,
  relationnalField: "father",
  onNodeClick: nodeData => console.log("you clicked me!"),
});

myTree.refresh(flat_data_example);

Hierarchical data case :

var hierarchical_data_example = {
  name: "Mom",
  qty: 10,
  children: [{ name: "Son A", qty: 3 }, { name: "Son B", qty: 7 }],
};

var myTree = Treeviz.create({
  htmlID: "tree",
  nodeField: "name",
  flatData: false,
  relationnalField: "children",
});

myTree.refresh(hierarchical_data_example);

Credits

This module is based on d3 library, credit to all the contributors of this project.

License

BSD