Reid  Rohan

Reid Rohan

1656926760

Treeviz: Tree Diagrams with JavaScript

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.

💅 Come play with the Treeviz storybook! 💅

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

React

Check the treeviz wrapper for react: treeviz-react

Vanilla JavaScript

// 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",
  idKey: "id",
  hasFlatData: 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.

Treeviz 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",
  idKey: "name",
  hasFlatData: false,
  relationnalField: "children",
});

myTree.refresh(hierarchical_data_example);

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

KeyTypeDefaultDefinition
htmlIdstring (Required) The HTML id tag on the page where the tree should be drawn. It must have a width and an height specified
idKeystring"id"The key in a data item representing the unique identifier of a node
relationnalFieldstring"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).
hasFlatDatabooleantrueSpecify whether the data passed to the tree is flat or already hierarchical
hasPanbooleanfalseToggle the ability to pan the tree
hasZoombooleanfalseToggle the ability to zoom the tree
nodeWidthnumber160Width of a node in px
nodeHeightnumber100Height of a node in px
linkColorfunction(nodeData) => "#ffcc80"Color of the link
linkWidthfunction(nodeData) => 10Width of the link
linkShape"quadraticBeziers" | "orthogonal" | "curve""quadraticBeziers"Shape of the link
renderNodefunction(nodeData) => nullHTML template for every node
isHorizontalbooleantrueDirection of the tree. If true, the tree expands from left to right. If false, it goes from top to bottom
onNodeClickfunction(nodeData) => nullFunction handling the event when someone click on it
onNodeMouseEnterfunction(nodeData) => nullFunction handling the event when someone hover a node
onNodeMouseLeavefunction(nodeData) => nullFunction handling the event when the mouse pointer leaves a node
mainAxisNodeSpacingnumber or "auto"300Set 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.
secondaryAxisNodeSpacingnumber1.25Set the distance between nodes in the same level as a coefficient of node dimensions. Recommended to have the value superior to 1
marginTopnumber1.25Set the margin between the SVG element and the tree
marginBottomnumber1.25Set the margin between the SVG element and the tree
marginLeftnumber1.25Set the margin between the SVG element and the tree
marginRightnumber1.25Set the margin between the SVG element and the tree
durationnumber600The duration of the animation transition between layouts

Credits

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

Author: PierreCapo
Source Code: https://github.com/PierreCapo/treeviz 
License: BSD

#javascript #visualization #d3 #tree 

What is GEEK

Buddha Community

Treeviz: Tree Diagrams with JavaScript

Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

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JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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Niraj Kafle

1589255577

The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips

Reid  Rohan

Reid Rohan

1656926760

Treeviz: Tree Diagrams with JavaScript

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.

💅 Come play with the Treeviz storybook! 💅

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

React

Check the treeviz wrapper for react: treeviz-react

Vanilla JavaScript

// 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",
  idKey: "id",
  hasFlatData: 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.

Treeviz 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",
  idKey: "name",
  hasFlatData: false,
  relationnalField: "children",
});

myTree.refresh(hierarchical_data_example);

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

KeyTypeDefaultDefinition
htmlIdstring (Required) The HTML id tag on the page where the tree should be drawn. It must have a width and an height specified
idKeystring"id"The key in a data item representing the unique identifier of a node
relationnalFieldstring"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).
hasFlatDatabooleantrueSpecify whether the data passed to the tree is flat or already hierarchical
hasPanbooleanfalseToggle the ability to pan the tree
hasZoombooleanfalseToggle the ability to zoom the tree
nodeWidthnumber160Width of a node in px
nodeHeightnumber100Height of a node in px
linkColorfunction(nodeData) => "#ffcc80"Color of the link
linkWidthfunction(nodeData) => 10Width of the link
linkShape"quadraticBeziers" | "orthogonal" | "curve""quadraticBeziers"Shape of the link
renderNodefunction(nodeData) => nullHTML template for every node
isHorizontalbooleantrueDirection of the tree. If true, the tree expands from left to right. If false, it goes from top to bottom
onNodeClickfunction(nodeData) => nullFunction handling the event when someone click on it
onNodeMouseEnterfunction(nodeData) => nullFunction handling the event when someone hover a node
onNodeMouseLeavefunction(nodeData) => nullFunction handling the event when the mouse pointer leaves a node
mainAxisNodeSpacingnumber or "auto"300Set 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.
secondaryAxisNodeSpacingnumber1.25Set the distance between nodes in the same level as a coefficient of node dimensions. Recommended to have the value superior to 1
marginTopnumber1.25Set the margin between the SVG element and the tree
marginBottomnumber1.25Set the margin between the SVG element and the tree
marginLeftnumber1.25Set the margin between the SVG element and the tree
marginRightnumber1.25Set the margin between the SVG element and the tree
durationnumber600The duration of the animation transition between layouts

Credits

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

Author: PierreCapo
Source Code: https://github.com/PierreCapo/treeviz 
License: BSD

#javascript #visualization #d3 #tree 

Ajay Kapoor

1626321063

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