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D3.js Promises: Who needs the complication of writing code to handle asynchronous activities that happen out of your app's control, such as network requests and file I/O?

JavaScript Promises make asynchronous code is loaded as:

 <script type="text/javascript" src="js/d3/d3.js"></script> 

What is JavaScript D3.js?

D3 is a JavaScript library for creating Data-Driven Documents on the web. It is perhaps the most commonly-used environment for creating interactive visualizations on the web.

D3 simplifies many of the tasks of creating visualizations on the web. In order to use it, however, you will need to understand:

  • JavaScript

  • The HTML Document Object Model (DOM)

  • The SVG vector graphics format

  • Cascading Style Sheets (CSS)

Now we know basic concept before start the D3:

Now about HTML

A web page is generally written in HTML, which describes the contents of the web page to display. It consists of elements, described by tags. The first of these tags is the <html> tag, which tells the browser that this is an HTML document. All tags are written in angled brackets (<>). Most tags have a start tag and an end tag, where the end tag starts with a /. In our example, our document starts with <html> and ends with </html>. Everything between is considered as a child element of the <html> tag.

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Know about SVG

What is SVG?

  • SVG is an image that is text-based.

  • SVG is similar in structure to HTML

  • SVG sits in the DOM

  • SVG properties can be specified as attributes

  • SVG should have absolute positions relative to the origin (0, 0)

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Example:

 

          svg width="500" height="500">

                   rect x="0" y="0" width="200" height="200"></rect>

          svg>

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Know about CSS

In CSS, we can define rules of the form property: value;. For example: color: red; or border: 1px solid steelblue; As you can see, some properties can have multiple values.

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Example:

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         rect {

        fill: blue;

        }

 

Know about JavaScript

In JavaScript, you have to declare your variables, as in Java. On the other hand, you don’t need to specify their types, as in Python

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Selections using D3

Using d3.select(..) method

 

Example:

d3.select(“body”);

 

Some different types of selections use in D3..

  •  Tag

  • Class

  • Unique identifier

  • Attribute

 

 

Adding Elements in D3

use .append(..) method.

Example:

       var svg = d3.select(“body”).append(“svg”);

 

Setting attributes

Example:

       svg.attr({“width”:500, “height”:500});

 

 

Appending data to DOM

 

          //data values

         var data_values = [10,20,30,40,50,5,2,12,70,26];

        //create rectangles

        var bars = svg.selectAll("rect")

        .data(data_values)

        .enter()

        .append("rect")

        .attr("width","25px")

       .attr("height", function(d){ return d; });

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