7.4 animated bar chart | height

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<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.v3.min.js"></script>

<p id="h1">ANIMATION | HEIGHT</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>

<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 axis stylings*/

.x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:12px;
  opacity:1;
  fill:white;
}

.y-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:12px;
  opacity:1;
  fill:white;
}

#text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:12px;
  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:2;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}

/*Defining chart stylings*/

.bar {
  fill:#8ff798;
  opacity:0.8;
}

.bar:hover {
  fill:#8ff798;
  opacity:1;
}

</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})`);

//Define the format
var formatNumber = d3.format(".1s");

//Data loading
d3.tsv(
  "data.tsv",
  type,
  data => {

//X scale
var x = d3.scale.ordinal()
    .domain(data.map(d => d.letter))
    .rangeRoundBands([0, w], 0.5);

//Y scale
var y = d3.scale.linear()
    .domain([0, d3.max(data, d => d.frequency)])
    .range([h, 0]);

//Call X axis
svg.append("g")
   .attr("class", "x-axis")
   .attr("transform", "translate(0, "+h+")")
   .call(d3.svg.axis()
            .scale(x)
            .orient("bottom"));

//Call Y axis
svg.append("g")
   .attr("class", "y-axis")
   .call(d3.svg.axis()
            .scale(y)
            .orient("left")
            .ticks(3)
            .tickSize(-w)
            .tickPadding(10)
            .tickFormat(formatNumber))
   .append("text")
   .attr("id", "text")
   .attr("transform", "rotate(-90)")
   .attr("y", -30)
   .attr("dy", ".71em")
   .style("text-anchor", "end")
   .text("Total nr. of cases");

//Draw the bars
svg.selectAll(".bar")
   .data(data)
   .enter()
   .append("rect")
   .attr("class", "bar")
   .attr("x", d => x(d.letter))
   .attr("width", x.rangeBand())
   .attr("y", 470)
   .attr("height", d => h - 470)
   .transition()
   .duration(1000)
   .attr("y",d => y(d.frequency))
   .attr("height", d => h - y(d.frequency));
});

//Data format
function type(d) {
  d.frequency = +d.frequency;
  return d;
}

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

https://d3js.org/d3.v3.min.js