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labelsExit.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Dynamic labels: Add and Remove data in v4 (sample dataset from Scott Murray's excellent book Interactive Data Visualization for the Web)</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
body {
font-family: Futura;
font-size: 16px;
fill: white;
background-color: white;
}
h1 {
font-family: Futura;
font-size: 24px;
fill: white;
}
</style>
</head>
<body>
<div style="margin-bottom: 20px">
<button id="add" style="color:dodgerblue;">add data value</button>
<button id="remove" style="color: purple">remove data value</button>
</div>
<script type="text/javascript">
var w = 600,
h = 250,
centered;
var dataset = [ { key: 0, value: 5 },
{ key: 1, value: 10 },
{ key: 2, value: 13 },
{ key: 3, value: 19 },
{ key: 4, value: 21 },
{ key: 5, value: 25 },
{ key: 6, value: 22 },
{ key: 7, value: 18 },
{ key: 8, value: 15 },
{ key: 9, value: 13 },
{ key: 10, value: 11 },
{ key: 11, value: 12 },
{ key: 12, value: 15 },
{ key: 13, value: 20 },
{ key: 14, value: 18 },
{ key: 15, value: 17 },
{ key: 16, value: 16 },
{ key: 17, value: 18 },
{ key: 18, value: 23 },
{ key: 19, value: 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, function(d) { return d.value; })])
.range([0, h - 20]);
//Define key function, to be used when binding data
var key = function(d) {
return d.key;
};
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset, key) //Bind data with custom key function
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return yScale(d.value);
})
.attr("fill", function(d) {
return "rgb(50, " + (d.value * 10) + ", 100 )";
});
//Create labels
svg.selectAll("text")
.data(dataset, key) //Bind data with custom key function
.enter()
.append("text")
.text(function(d) {
return d.value;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
return h - yScale(d.value) + 14;
})
.attr("font-family", "Futura")
.attr("font-size", "12px")
.attr("fill", "white");
//On click, update with new data
d3.selectAll("button")
.on("click", function() {
var paragraphID = d3.select(this).attr("id");
//Add one value to dataset if add is clicked
if (paragraphID == "add") {
var minValue = 2;
var maxValue = 25 - minValue;
var newNumber = Math.floor(Math.random() * maxValue) + minValue;
var lastKeyValue = dataset[dataset.length - 1].key;
//console.log(lastKeyValue);
//Add key - value pair to dataset
dataset.push({
key: lastKeyValue + 1,
value: newNumber
});
} else {
//Remove one value from dataset
dataset.shift();
}
//Update scale domain
xScale.domain(d3.range(dataset.length));
yScale.domain([0, d3.max(dataset, function(d) { return d.value; })]);
//Select ...
var bars = svg.selectAll("rect")
.data(dataset, key); //Bind data with cutrom key function
//Enter...
bars.enter()
.append("rect")
.attr("x", w)
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return yScale(d.value);
})
.attr("fill", function(d) {
return "rgb(50, " + (d.value * 10) + ", 100 )";
})
.merge(bars) //Update...
.transition()
.duration(500)
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return yScale(d.value);
});
//Exit...
bars.exit()
.transition()
.ease(d3.easePoly)
.duration(500)
.attr("x", -xScale.bandwidth())
// <-- Exit stage left
.remove();
//Update all labels
var labels = svg.selectAll("text")
.data(dataset, key); //Bind data with custom key function
labels.enter()
.append("text")
.text(function(d) {
return d.value;
})
.attr("text-anchor", "middle")
.attr("x", w - xScale.bandwidth()/2)
.attr("y", function(d) {
return h - yScale(d.value) + 14;
})
.attr("font-family", "Futura")
.attr("font-size", "12px")
.attr("fill", "white");
labels.transition()
.duration(500)
.ease(d3.easePoly)
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
});
labels.exit()
.transition()
.duration(500)
.attr("x", -xScale.bandwidth())
.remove();
});
</script>
</body>
</html>