D3 Examples - 5.6 bar chart

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<!DOCTYPE html>
<meta charset="utf-8">
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<!-- Google fonts reference-->
<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">
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<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v4.min.js"></script>
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<!-- Creating the headlines -->
<p id="h1">ANIMATION | UPDATE</p>
<div id="link">
by <a href="https://slides.com/sandravizmad">SANDRA</a></div>
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<!-- Creating the buttons -->
<button id="start" style="position: absolute; margin-left:20px; margin-top:40px;">START</button>
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<style>
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/*Defining text stylings*/
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#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
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#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
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a:link, a:visited, a:active {
    text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}
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body {
  background-color:#011227;
}
​
/*Defining button stylings*/
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#start, #reset {
  font-family:'Montserrat Alternates', sans-serif;
  font-size:14px;
  color:WHITE;
  border:0;
  line-height:1;
  text-align:center;
  background-color:#011227;
}
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#start:hover, #reset:hover {
  color:#f5fa91;
  background-color:none;
}
​
/*Defining chart stylings*/
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.bars {
  fill:#8ff798;
}
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#lables {
  font-family:'Montserrat Alternates', sans-serif;
  font-size:12px;
  font-variant:small-caps slashed-zero;
    fill:white;
  text-anchor:middle;
}
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</style>
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<script>
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//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 800 - 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})`);
​
//Dataset as an array
var data=[5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
                 11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
​
//X scale
var x = d3.scaleBand()
        .domain(d3.range(data.length))
        .rangeRound([0, w])
        .paddingInner(0.05);
​
//Y scale
var y = d3.scaleLinear()
        .domain([0, d3.max(data)])
        .range([h, 0]);
​
//Draw the bars
svg.selectAll("rect")
    .data(data)
    .enter()
    .append("rect")
    .attr("x", (d,i) => x(i))
    .attr("y", d => y(d))
    .attr("width", x.bandwidth())
    .attr("height",d => h - y(d))
  .attr("class", "bars");
​
//Add the lables
svg.selectAll("text")
    .data(data)
    .enter()
    .append("text")
    .text(d=>d)
    .attr("x",(d,i)=> x(i)+x.bandwidth()/2)
    .attr("y",d=> y(d)-10)
    .attr("id","lables");
​
// Animation by click
d3.select("#start")
  .on("click",function() {
​
//New dataset
data =[11, 12, 15, 20, 18, 17, 16, 18, 23, 25,
                5, 10, 13, 19, 21, 25, 22, 18, 15, 13];
​
//Redraw the bars
svg.selectAll("rect")
     .data(data)
     .attr("y",d => y(d))
     .attr("height",d => h-y(d));
​
//Re-add the lables
svg.selectAll("text")
    .data(data)
    .text(d => d)
    .attr("x",(d,i) => x(i) + x.bandwidth()/2)
    .attr("y",d => y(d) - 10);
});
​
</script>
</body>
</html>
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