JS D3.js

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JS D3.js

D3.js is a JavaScript library for manipulating HTML data.

D3.js is easy to use.

How to Use D3.js?

Use D3.js on your web page, and add a link to the library:

<script src=”//d3js.org/d3.v3.min.js”></script>

This script selects the body element and appends a paragraph with the text “Hello World!”:

Example

<!DOCTYPE html>

<html>

<script src=”//d3js.org/d3.v4.js”></script>

<body>

<h2>D3.js is Easy to Use</h2>

<p>The script below selects the body element and appends a paragraph with the text “Hello World!”:</p>

<script>

d3.select(“body”).append(“p”).text(“Hello World!”);

</script>

</body>

</html>

Output

D3.js is Easy to Use

The script below selects the body element and appends a paragraph with the text "Hello World!":

Hello World!

Scatter Plot

Example

<!DOCTYPE html>

<html>

<script src=”https://d3js.org/d3.v4.js”></script>

<body>

<h2>D3.js Scatter-Plot</h2>

<svg id=”myPlot” style=”width:500px;height:500px”></svg>

<script>

// Set Dimensions

const xSize = 500;

const ySize = 500;

const margin = 40;

const xMax = xSize – margin*2;

const yMax = ySize – margin*2;

// Create Random Points

const numPoints = 100;

const data = [];

for (let i = 0; i < numPoints; i++) {

  data.push([Math.random() * xMax, Math.random() * yMax]);

}

// Append SVG Object to the Page

const svg = d3.select(“#myPlot”)

  .append(“svg”)

  .append(“g”)

  .attr(“transform”,”translate(” + margin + “,” + margin + “)”);

// X Axis

const x = d3.scaleLinear()

  .domain([0, 500])

  .range([0, xMax]);

svg.append(“g”)

  .attr(“transform”, “translate(0,” + yMax + “)”)

  .call(d3.axisBottom(x));

// Y Axis

const y = d3.scaleLinear()

  .domain([0, 500])

  .range([ yMax, 0]);

svg.append(“g”)

  .call(d3.axisLeft(y));

// Dots

svg.append(‘g’)

  .selectAll(“dot”)

  .data(data).enter()

  .append(“circle”)

  .attr(“cx”, function (d) { return d[0] } )

  .attr(“cy”, function (d) { return d[1] } )

  .attr(“r”, 3)

  .style(“fill”, “Red”);

</script>

</body>

</html>

Output

D3.js Scatter-Plot


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