Interview Questions.

Top 100+ D3.js Interview Questions And Answers


Top 100+ D3.js Interview Questions And Answers

Question 1. How To Data Binding Work In D3.Js?

Answer :

The D3.Js is information pushed and the records () feature is used to sign up for the specified array item of statistics to the chosen DOM elements and return up to date selection.

The data binding methods –

records() characteristic – This feature Joins the facts to the selected factors
input() function- This functions is used to creates a spread with placeholder references for missing elements
go out() function – This capabilities is used to removes nodes and adds them to the go out selection which may be later eliminated from the DOM
datum() function – This functions is used to injects data to the chosen element with out computing a be a part of
The Example seems like –

var records Array = ["Hello,  This is data array!"];

var select Data = d3.Pick("frame").SelectAll("p").Information(dataArray)

      .Text(function (dt)    

    return dt;


Question 2. What About The Selections In D3.Js?

Answer :

The D3.Js enables us to pick the factors and it lets in us to pick one or greater factors in a HTML pages. It allows us to modify, append or eliminate factors based on CSS selectors.

The selector strategies-

pick() – It is used to selects the HTML detail primarily based on CSS Selectors.
Pick out All() -  It is used to select more than one elements from HTML DOM.
textual content()
fashion() and
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Question three. What Are The Key Features Of D3.Js?

Answer :

Data Driven
DOM Manipulation
Interaction and animation
Custom Visualizations - Pie chart, graphs, bar charts or geospatial maps
Question four. List The Command To Interpolate Two Objects In D3.Js?

Answer :

d3.InterpolateObject(a,b) command is used to interpolate two gadgets in d3.Js

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Question five. Explain Transition In D3.Js?

Answer :

A transition is a variety-like interface for animating changes to the DOM. Instead of applying adjustments instantly, transitions easily interpolate the DOM from its present day nation to the favored goal state over a given duration.

To observe a transition, pick factors, call selection.Transition after which make the desired modifications.

For example:



    .Fashion("heritage-color", "crimson");

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Question 6. List Type Of Sliders Are Available In D3.Js?

Answer :

There are 7 styles of slider are available in D3.Js,


Default slider
Slider with begin price
Slider with slide event: 0
Slider with default axis
Slider with custom axis
Slider with min, max and step values
Vertical slider
Question 7. Explain Selections In D3.Js?

Answer :

D3 implements a declarative method, running on arbitrary units of nodes called selections.

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Question eight. How D3.Js Identify On Which Elements To Operate?

Answer :

D3.Js uses CSS-style selectors to become aware of elements on which to perform.


d3.SelectAll("p").Fashion("colour", "white");

Question nine. Why Use To D3.Js?

Answer :

You can use D3 js because:

D3.Js lets you to build the facts visualization framework
D3.Js specializes in binding records to DOM factors.
D3.Js is written in JavaScript and uses a purposeful style which means you can reuse code and add precise capabilities in your coronary heart’s content.
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Question 10. Who Developed D3.Js?

Answer :

Mike Bostock wrote D3.Js based totally on his paintings at some stage in his Ph.D. Studies at the Stanford Visualization Group. Mike labored at the The New York Times for a while and is now independently operating on D3.Js.

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Question 11. What Does D3 Stand For?

Answer :

D3 stands for Data-Driven Documents

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Question 12. Define D3.Js?

Answer :

D3.Js is described as a JavaScript-based library for manipulating documents based on information. D3 helps you convey statistics to life the usage of HTML, SVG, and CSS. D3’s emphasis on internet requirements gives you the total abilties of current browsers with out tying your self to a proprietary framework, combining powerful visualization components and a records-driven technique to DOM manipulation.

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