Basic animation on barplot in d3.js

Steps:

The Html part of the code just creates a div that will be modified by d3 later on.

The first part of the javascript code set a svg area. It specify the chart size and its margin. Read more.

To create the animation, bars are first drawn with a height of 0. Then they reach their real value using the transition() function.

<!DOCTYPE html>
<meta charset="utf-8">

<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>

<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>

<script>


// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 90, left: 40},
    width = 460 - margin.left - margin.right,
    height = 450 - margin.top - margin.bottom;

// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
  .append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform",
          "translate(" + margin.left + "," + margin.top + ")");

// Parse the Data
d3.csv("https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/7_OneCatOneNum_header.csv", function(data) {

// X axis
var x = d3.scaleBand()
  .range([ 0, width ])
  .domain(data.map(function(d) { return d.Country; }))
  .padding(0.2);
svg.append("g")
  .attr("transform", "translate(0," + height + ")")
  .call(d3.axisBottom(x))
  .selectAll("text")
    .attr("transform", "translate(-10,0)rotate(-45)")
    .style("text-anchor", "end");

// Add Y axis
var y = d3.scaleLinear()
  .domain([0, 13000])
  .range([ height, 0]);
svg.append("g")
  .call(d3.axisLeft(y));

// Bars
svg.selectAll("mybar")
  .data(data)
  .enter()
  .append("rect")
    .attr("x", function(d) { return x(d.Country); })
    .attr("width", x.bandwidth())
    .attr("fill", "#69b3a2")
    // no bar at the beginning thus:
    .attr("height", function(d) { return height - y(0); }) // always equal to 0
    .attr("y", function(d) { return y(0); })

// Animation
svg.selectAll("rect")
  .transition()
  .duration(800)
  .attr("y", function(d) { return y(d.Value); })
  .attr("height", function(d) { return height - y(d.Value); })
  .delay(function(d,i){console.log(i) ; return(i*100)})

})

</script>

Steps:

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