7.7 animated bar chart | new dataset 2

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

<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">

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

<p id="h1">BAR CHART | UPDATE</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a> | <a href="https://data.oecd.org/agrland/nutrient-balance.htm">DATA</a></div>

<button id="start" style="position: absolute; margin-left:25px; margin-top:60px;">START</button>

<style>

/*Defining text stylings*/

#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}

#link {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
	margin:5px 0px 0px 22px;
  color:white;
}

a:link, a:visited, a:active {
	text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}

body {
  background-color:#011227;
}

/*Defining button stylings*/

#start, #reset {
  font-family:'Montserrat Alternates', sans-serif;
  font-size:12px;
  color:WHITE;
  border:0;
  line-height:1;
  text-align:center;
  background-color:#011227;
}

#start:hover, #reset:hover {
  color:#f5fa91;
  background-color:NONE;
}

/*Defining axis stylings*/

.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:100;
  font-size:9px;
  opacity:1;
  fill:white;
}

.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}

.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}

.y-axis line, .x-axis line {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}

/*Defining chart stylings*/

.bar {
  fill-opacity:0.8;
}

</style>
</head>

//Margin conventions
var m = {top:100, right:50, bottom:50, left:50}
    w = 600 - m.left - m.right,
    h = 600 - m.top - m.bottom;

//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
    .attr("transform", `translate(${m.left}, ${m.top})`);

//Data loading
d3.csv(
  'https://gist.githubusercontent.com/sandravizz/b5562c21f4f4175b1e7864cfe924d7a5/raw/6f8d2feff718a1e04966c25aa8ad02f1d07e7d67/OECD%2520Nutrition%2520balance%2520(indicator)%2520by%2520country%25202015', 
  prepare, 
  data => {

//Sort data by value
data.sort((b, a) => a.Value - b.Value);

//Save absolut max and min
var maxh = d3.max(data, d => Math.abs(+d.Value));
var minh = d3.min(data, d => Math.abs(+d.Value))

//Check
console.log(minh);

//Color scale
var c = d3.scaleLinear()
    .domain([maxh, minh])
    .range(["#85f6fa", "#8ff798"]);

//Another color scale
var c2 = d3.scaleLinear()
    .domain([maxh, minh])
    .range(["white"]);

//X scale
var x = d3.scaleBand()
		.domain(data.map(d => d.LOCATION))
		.rangeRound([0, w])
		.paddingInner(0.03);

//Y scale
var y = d3.scaleLinear()
		.domain([maxh, -10])
		.rangeRound([0, h]);

//X axis
svg.append("g")
   .attr("class", "x-axis")
   .attr("transform", `translate(0, ${h/1.02})`)
   .call(d3.axisBottom()
					 .scale(x))
   .selectAll("text")
   .attr("y", 6)
   .attr("x", 0)
   .attr("transform", "rotate(35)")
   .style("text-anchor", "start");

//Call y axis
svg.append("g")
   .attr("class", "y-axis")
   .call(d3.axisLeft()
					 .scale(y)
					 .ticks(6)
           .tickPadding(-5));

//Draw the bars
svg.selectAll('rect')
   .data(data)
	 .enter()
	 .append('rect')
	 .attr('class','bar')
	 .attr("x", d => x(d.LOCATION))
	 .attr("width", x.bandwidth())
   .attr("y", d => {if(+d.Value < 0) {return h/1.175;}
		else{return y(+d.Value);}})
	 .attr("height", d => h/1.175 - y(Math.abs(+d.Value)))
   .attr("fill", d => {if(+d.Value >= 0) {return c(d.Value);}
		else{return c2(d.Value);}})
});

// Animation by click
d3.select("#start")
  .on("click", function() {

//Data loading
d3.csv(
  'https://gist.githubusercontent.com/sandravizz/dc8b059ba4415292040d8d3be3fecf19/raw/075f7401e72130be5cf6a958a91a86fe676f614d/OECD%2520PHOSPHORUS%2520Tonne%2520(indicator)%2520by%2520country%25202015', 
  prepare, 
  data => {

//Sort data by value
  data.sort((b, a) => {return a.Value - b.Value;});

//Color scale
  var c = d3.scaleLinear()
      .domain(d3.extent(data, d => d.Value))
      .range(["#8ff798", "#85f6fa"]);

//X scale
  var x = d3.scaleBand()
  		.domain(data.map(d => d.LOCATION))
  		.rangeRound([0, w])
  		.paddingInner(0.05);

//Y scale
  var y = d3.scaleLinear()
  		.domain(d3.extent(data, d => d.Value))
  		.range([h,0]);

//Transition of the x axis
  svg.select(".x-axis")
  	 .transition()
  	 .duration(2000)
  	 .call(d3.axisBottom()
  					 .scale(x)
  					 .ticks(5))
  	 .attr("transform", "translate(0, "+h+")");

//Define format for y axis
  var formatNumber = d3.format(".0s");

//Transition of the y axis
  svg.select(".y-axis")
  	 .transition()
  	 .duration(2000)
  	 .call(d3.axisLeft()
  					 .scale(y)
  					 .ticks(5)
  					 .tickFormat(formatNumber));

//Draw the bars
  svg.selectAll('rect')
     .data(data)
  	 .transition()
     .duration(5000)
  	 .attr("y", d => y(d.Value))
  	 .attr("height", d => h - y(d.Value))
     .attr("fill", d => c(d.Value));
})
});

//Make sure all variables are numbers
function prepare (d) {
  d.Value = +d.Value;
  return d;
}

</script>
</body>
</html>

https://d3js.org/d3.v4.min.js