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<!DOCTYPE html>
<!-- https://raw.githubusercontent.com/alignedleft/d3-book/master/chapter_10/05_mouseout.html -->
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Using D3 to change fill color on mouseover AND mouseout</title>
<script src="https://d3js.org/d3.v5.js"></script>
<style type="text/css">
/* No style rules here yet */
</style>
</head>
<body>
<script type="text/javascript">
//Width and height
var w = 600;
var h = 250;
var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
var xScale = d3.scaleBand()
.domain(d3.range(dataset.length))
.rangeRound([0, w])
.paddingInner(0.05);
var yScale = d3.scaleLinear()
.domain([0, d3.max(dataset)])
.range([0, h]);
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return yScale(d);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + Math.round(d * 10) + ")";
})
.on("mouseover", function() {
d3.select(this)
.attr("fill", "orange");
})
.on("mouseout", function(d,index,context) {
d3.select(this)
.attr("fill", "rgb(0, 0, " + (d * 10) + ")");
}); // Alternative ways to do this?
//Create labels
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text(function(d) {
return d;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
return h - yScale(d) + 14;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
</script>
</body>
</html>